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seiko instruments inc. 1 s-8324/8328 series small package pwm/pfm control step-up switching regulator the s-8324/8328 is a series of cmos pwm/pfm-control step-up switching regulators which mainly consist of a reference voltage source, an oscillation circuit, a power mos fet (s-8324 series) and an error amplifier. the new method pwm/pfm control circuit automatically switches the control method according to the current load, offering products of a wide range, high efficiency. a step-up switching regulator is constructed by externally connecting only a coil, a capacitor and a diode to the s-8324 series. this feature, along with its small package and low current consumption, makes the s-8324 series ideal for the power supply of portable equipment. for applications requiring a high output current, products used with an external transistor (s-8328 series) are also available. ? ?? ? features ? low voltage operation: 0.9 v (i out =1 ma, 50 khz and 100 khz models) ? low current consumption: during operation: 17.2 a (typ.) (v out = 3 v, 50 khz) during shutdown: 0.5 a (max.) ? low input current: 10.4 a ( typ.) (v out = 3 v, 50 khz, no load) ? duty ratio: durin g pwm control: 15 to 83% t yp . (15 to 78% for 250khz model) durin g pfm control: 15 % t yp . ? external p arts: coil, diode, and ca p acitor onl y (a transistor is needed for the s-8328 series.) ? output voltage: accuracy of 2.4% ? oscillation fre q uenc y : 30 khz, 50 khz, 100 khz, and 250 khz ? software start function is built-in ? shutdown function ? external transistor type is available (s-8328 series) ? sot-23-5 small plastic package ? sot-23-3 small plastic package ? sot-89-3 miniature power molded plastic package ? step-down and invert type are also available. ? ?? ? applications ? power supplies for portable equipment such as pagers, handy calculators, and remote controllers ? constant voltage power supplies for cameras, video equipment, and communications equipment ? power supply for microcomputers ? ?? ? block diagram on/ off pwm control circuit - + vout vout vout vout cont cont vref soft start circuit vss - + vref vss vdd vdd vss vss ? vref - + vref ext ext on/ off (2) s-8328 series (types b, h) (1) s-8324 series (types a, c, h) pwm control circuit soft start circuit (4) s-8328 series (types e, j) (3) s-8324 series (types d, j) pwm control circuit soft start circuit pwm control circuit soft start circuit figure 1 block diagram rev. 7.2 _10 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 2 seiko instruments inc. ? ?? ? selection guide 1. product name s-832 x x xx xx - xxx - t2 tape specification product name (abbreviation) package name (abbreviation) ma : sot-23-3 (without shutdown function) mc : sot-23-5 (with shutdown function, v dd /v out separate product) ua : sot-89-3 (without shutdown function) output voltage (symbol) 10 product category a : normal product, fosc=50 khz (s-8324 only) b : normal product, fosc=100 khz (s-8328 only) c : for pagers, fosc=30 khz (s-8324 only) d: v dd /v out separate product, fosc=50 khz (s-8324 only) e: v dd /v out separate product, fosc=100 khz (s-8328 only) h : normal product, fosc=250 khz (s-8324/8) j:v dd /v out separate product, fosc=250 khz (s-8324/8) power transistor 4: built-in pwm/pfm control switch. 8: pwm/pfm control switch with an external transistor. product name built in power transistor with external power transistor switching frequency (khz) shutdown function v dd /v out separate type package application s-8324axxmc yes ? 50 yes ? sot-23-5 with a shutdown function s-8324axxma yes ? 50 ?? sot-23-3 without shutdown function s-8324axxua yes ? 50 ?? sot-89-3 without shutdown function s-8324dxxmc yes ? 50 ? yes sot-23-5 for variable out p ut volta g e b y ste p -u p dc/dc converter and ste p -down inverted out p ut dc/dc converter with an external resistor s-8324cxxma yes ? 30 ?? sot-23-3 for p a g ers s-8324hxxmc yes ? 250 yes ? sot-23-5 with a shutdown function s-8324jxxmc yes ? 250 ? yes sot-23-5 for variable out p ut volta g e b y ste p -u p dc/dc converter and ste p -down inverted out p ut dc/dc converter with an external resistor s-8328bxxmc ? yes 100 yes ? sot-23-5 for lar g e load current with shutdown function s-8328bxxma ? yes 100 ?? sot-23-3 for lar g e load current without shutdown function s-8328bxxua ? yes 100 ?? sot-89-3 for lar g e load current without shutdown function s-8328exxmc ? yes 100 ? yes sot-23-5 for variable out p ut volta g e b y ste p -u p dc/dc converter with an external resistor s-8328hxxmc ? yes 250 yes ? sot-23-5 for lar g e load current without shutdown function s-8328jxxmc ? yes 250 ? yes sot-23-5 for variable out p ut volta g e b y ste p -u p dc/dc converter with an external resistor discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 3 3. product name list output voltage (v) s-8324axxmc series s-8324axxma series s-8324axxua series s-8324cxxma series s-8324dxxmc series 2.0 ???? s-8324d20mc-e2a-t2 2.5 s-8324a25mc-eof-t2 s-8324a25ma-eof-t2 s-8324a25ua-eof-t2 s-8324c25ma-eqf-t2 ? 2.7 s-8324a27mc-eoh-t2 s-8324a27ma-eoh-t2 s-8324a27ua-eoh-t2 s-8324c27ma-eqh-t2 ? 2.8 s-8324a28mc-eoi-t2 ? s-8324a28ua-eoi-t2 ?? 3.0 s-8324a30mc-eok-t2 s-8324a30ma-eok-t2 s-8324a30ua-eok-t2 s-8324c30ma-eqk-t2 s-8424d30mc-e2k-t2 3.3 s-8324a33mc-eon-t2 s-8324a33ma-eon-t2 s-8324a33ua-eon-t2 ?? 5.0 s-8324a50mc-epe-t2 s-8324a50ma-epe-t2 s-8324a50ua-epe-t2 ? s-8324d50mc-e4e-t2 output voltage (v) s-8324hxxmc series s-8324jxxmc series 2.5 ? s-8324j25mc-fuf-t2 3.0 s-8324h30mc-f6k-t2 s-8324j30mc-fuk-t2 3.3 s-8324h33mc-f6n-t2 s-8324j33mc-fun-t2 5.0 s-8324h50mc-f7e-t2 s-8324j50mc-fve-t2 5.2 s-8324h52mc-f7g-t2 ? 5.3 s-8324h53mc-f7h-t2 ? 5.4 s-8324h54mc-f7i-t2 ? 5.5 s-8324h55mc-f7j-t2 ? output voltage (v) s-8328bxxmc series s-8328bxxma series s-8328bxxua series s-8328exxmc series 2.0 ??? s-8328e20mc-eya-t2 2.4 s-8328b24mc-ewe-t2 ??? 2.5 s-8328b25mc-ewf-t2 s-8328b25ma-ewf-t2 s-8328b25ua-ewf-t2 ? 2.7 s-8328b27mc-ewh-t2 s-8328b27ma-ewh-t2 s-8328b27ua-ewh-t2 ? 2.8 s-8328b28mc-ewi-t2 ??? 3.0 s-8328b30mc-ewk-t2 s-8328b30ma-ewk-t2 s-8328b30ua-ewk-t2 ? 3.2 s-8328b32mc-ewm-t2 ??? 3.3 s-8328b33mc-ewn-t2 s-8328b33ma-ewn-t2 s-8328b33ua-ewn-t2 ? 3.4 s-8328b34mc-ewo-t2 ??? 3.6 s-8328b36mc-ewq-t2 ??? 3.8 s-8328b38mc-ews-t2 ??? 4.9 s-8328b49mc-exd-t2 ??? 5.0 s-8328b50mc-exe-t2 s-8328b50ma-exe-t2 s-8328b50ua-exe-t2 s-8328e50mc-e9e-t2 5.1 s-8328b51mc-exf-t2 ??? 5.2 s-8328b52mc-exg-t2 ??? 5.4 s-8328b54mc-exi-t2 ??? 5.5 s-8328b55mc-exj-t2 ??? output voltage (v) s-8328hxxmc series s-8328jxxma series 2.5 s-8328h25mc-fyf-t2 s-8328j25mc-f2f-t2 3.0 S-8328H30MC-FYK-T2 s-8328j30mc-f2k-t2 3.2 s-8328h32mc-fym-t2 ? 3.3 s-8328h33mc-fyn-t2 s-8328j33mc-f2n-t2 5.0 s-8328h50mc-fze-t2 s-8328j50mc-f3e-t2 5.5 s-8328h55mc-fzj-t2 ? consult our sales person for products with an output voltage other than specified above. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 4 seiko instruments inc. ? ?? ? pin assignment figure 2 ? ?? ? absolute maximum ratings note: although the ic contains protection circuit against static electricity, excessive static electricity or voltage which exceeds the limit of the protection circuit should not be applied to. pin no. pin name functions 1on / off shutdown pin ?h?: normal operation (stepping up operation) ?l?: stop stepping up (whole circuit stop) 2 vout output voltage pin and power supply pin 3 - n.c. (non connection) 4 vss gnd pin 5 cont external inductor connection pin (for s-8324 series) ext external transistor connection pin (for s-8328 series) pin no. pin name functions 1 vout output voltage pin 2 vdd power supply pin 3 - n.c. (non connection) 4 vss gnd pin 5 cont external inductor connection pin (for s-8324 series) ext external transistor connection pin (for s-8328 series) pin no. pin name functions 1 vss gnd pin 2 vout output voltage pin and power supply pin 3 cont external inductor connection pin (for s-8324 series) ext external transistor connection pin (for s-8328 series) parameter symbol ratings unit vout, vdd pin voltage v out , v dd v ss +11 v on/off pin voltage v on/off v ss -0.3 to v ss +11 v cont pin voltage v cont v ss +11 v cont pin current i cont 300 ma ext pin voltage v ext v ss -0.3 to v out +0.3 v ext pin current i ext 50 ma power dissipation pd sot-89-3 500 mw sot-23-5, sot-23-3 150 operating temperature t opr -40 to +85 c storage temperature t stg -40 to +125 c 2 3 1 sot-23-3 top view 5 4 3 2 1 sot-23-5 top view 3 2 1 sot-89-3 top view product names; s-8324axxma/s-8324axxua / s-8324cxxma s-8328bxxma / s-8328bxxua packages; sot-23-3, sot-89-3 ( unless otherwise s p ecified: ta=25 c ) product names; s-8324axxxmc / s-8328bxxmc s-8324hxxmc / s-8328hxxmc package; sot-23-5 product names; s-8324dxxmc / s-8328exxmc s-8324jxxmc / s-8328jxxmc package; sot-23-5 discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 5 ? ?? ? electrical characteristics 1-1. s-8324axxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8324a50mc 4.880 5.000 5.120 v 1 s-8324a33mc 3.221 3.300 3.379 s-8324a30mc 2.928 3.000 3.072 s-8324a28mc 2.733 2.800 2.867 s-8324a27mc 2.635 2.700 2.765 s-8324a25mc 2.440 2.500 2.560 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10 k ? ?? 0.8 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ?? 1 input current at no load i in no load s-8324a50mc ? 10.5 21.1 a ? s-8324a33mc ? 10.4 20.8 s-8324a30mc ? 10.4 20.7 s-8324a28mc ? 10.5 21.0 s-8324a27mc ? 10.5 21.1 s-8324a25mc ? 10.5 21.0 current consumption 1 i ss1 v out =output voltage 0.95 s-8324a50mc ? 30.2 50.3 2 s-8324a33mc ? 19.1 31.8 s-8324a30mc ? 17.2 28.7 s-8324a28mc ? 16.1 26.8 s-8324a27mc ? 15.5 25.9 s-8324a25mc ? 14.3 23.9 current consumption 2 i ss2 v out =output voltage+0.5 s-8324a50mc ? 3.5 6.9 s-8324a33mc ? 3.3 6.5 s-8324a30mc ? 3.2 6.4 s-8324a28mc ? 3.2 6.4 s-8324a27mc ? 3.2 6.4 s-8324a25mc ? 3.2 6.3 current consumption during shutdown i sss v on/off =0 v ?? 0.5 switching current i sw v cont =0.4 v s-8324a50mc 114 182 ? ma ? s-8324a33mc 78 125 ? s-8324a30mc 78 125 ? s-8324a28mc 61 98 ? s-8324a27mc 61 98 ? s-8324a25mc 61 98 ? switching transistor leak current i swq v out = v cont =10 v ?? 1.0 a line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage ? v out / ? ta ta=-40 c to +85 c s-8324a50mc ? 0.25 ? mv/ c temperature s-8324a33mc ? 0.17 ? coefficient s-8324a30mc ? 0.15 ? s-8324a28mc ? 0.14 ? s-8324a27mc ? 0.14 ? s-8324a25mc ? 0.13 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at cont pin 42.5 50 57.5 khz 2 max duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 75 83 90 % pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1 v no load 51524 1 shutdown pin v sh v out =output voltage 0.95 judged the oscillation at cont pin 0.75 ?? input voltage (on/off type) v sl1 v out =output voltage 0.95 when v out 1.5 v ?? 0.3 v 2 v sl2 judged the stop of oscillation at cont pin when v out <1.5 v ?? 0.2 soft start time t ss 3.0 6.0 12.0 ms ? efficiency effi s-8324a50mc ? 87 ? %1 s-8324a33mc ? 83 ? s-8324a30mc ? 83 ? s-8324a28mc ? 79 ? s-8324a27mc ? 79 ? s-8324a25mc ? 79 ? external parts used: -coil: cd54 (100 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 6 seiko instruments inc. 1-2. s-8324axxma, s-8324axxua, s-8324dxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8324x50xx 4.880 5.000 5.120 v 1 s-8324x33xx 3.221 3.300 3.379 s-8324x30xx 2.928 3.000 3.072 s-8324x27xx 2.635 2.700 2.765 s-8324x25xx 2.440 2.500 2.560 s-8324x20xx 1.952 2.000 2.048 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10k ? ?? 0.8 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ?? 1 input current at no load i in no load s-8324x50xx ? 10.5 21.1 a ? s-8324x33xx ? 10.4 20.8 s-8324x30xx ? 10.4 20.7 s-8324x27xx ? 10.5 21.1 s-8324x25xx ? 10.5 21.0 s-8324x20xx ? 10.8 21.5 current consumption 1 i ss1 v out =output voltage 0.95 s-8324x50xx ? 30.2 50.3 2 s-8324x33xx ? 19.1 31.8 s-8324x30xx ? 17.2 28.7 s-8324x27xx ? 15.5 25.9 s-8324x25xx ? 14.3 23.9 s-8324x20xx ? 11.6 19.4 current consumption 2 i ss2 v out =output voltage+0.5 s-8324x50xx ? 3.5 6.9 s-8324x33xx ? 3.3 6.5 s-8324x30xx ? 3.2 6.4 s-8324x27xx ? 3.2 6.4 s-8324x25xx ? 3.2 6.3 s-8324x20xx ? 3.1 6.2 switching current i sw v cont =0.4 v s-8324x50xx 114 182 ? ma ? s-8324x33xx 78 125 ? s-8324x30xx 78 125 ? s-8324x27xx 61 98 ? s-8324x25xx 61 98 ? s-8324x20xx 45 71 ? switching transistor leak current i swq v out = v cont =10 v ?? 1.0 a line regulation ? v out1 v in = output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage ? v out / ? ta ta=-40 c to +85 c s-8324x50xx ? 0.25 ? mv/ c temperature s-8324x33xx ? 0.17 ? coefficient s-8324x30xx ? 0.15 ? s-8324x27xx ? 0.14 ? s-8324x25xx ? 0.13 ? s-8324x20xx ? 0.10 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at cont pin 42.5 50 57.5 khz 2 max duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 75 83 90 % pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1v no load 51524 1 soft start time t ss 3.0 6.0 12.0 ms ? efficiency effi s-8324x50xx ? 87 ? %1 s-8324x33xx ? 83 ? s-8324x30xx ? 83 ? s-8324x27xx ? 79 ? s-8324x25xx ? 79 ? s-8324x20xx ? 75 ? external parts used: -coil: cd54 (100 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd /v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more voltage for v dd is recommended to stabilize the output voltage and oscilation frequency. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 7 1-3. s-8324cxxma (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8324c30ma 2.928 3.000 3.072 v 1 s-8324c27ma 2.635 2.700 2.765 s-8324c25ma 2.440 2.500 2.560 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10k ? ?? 0.8 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ?? 1 input current at no load i in no load s-8324c30ma ? 9.6 19.1 a ? s-8324c27ma ? 9.5 19.1 s-8324c25ma ? 9.7 19.3 current consumption 1 i ss1 v out =output voltage 0.95 s-8324c30ma ? 11.6 19.3 2 s-8324c27ma ? 10.5 17.5 s-8324c25ma ? 9.8 16.3 current consumption 2 i ss2 v out =output voltage+0.5 s-8324c30ma ? 3.0 5.9 s-8324c27ma ? 2.9 5.8 s-8324c25ma ? 2.9 5.8 switching current i sw v cont =0.4 v s-8324c30ma 78 125 ? ma ? s-8324c27ma 61 98 ? s-8324c25ma 61 98 ? switching transistor leak current i swq v out = v cont =10 v ?? 1.0 a line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage s-8324c30ma ? 0.15 ? mv/ c temperature ? v out / ? ta ta=-40 c to +85 c s-8324c27ma ? 0.14 ? coefficient s-8324c25ma ? 0.13 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at cont pin 25 30 35 khz 2 max duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 75 83 90 % pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1 v no load 51524 1 soft start time t ss 3.0 6.0 12.0 ms ? efficiency effi s-8324c30ma ? 81 ? %1 s-8324c27ma ? 77 ? s-8324c25ma ? 77 ? external parts used: -coil: cd54 (100 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? note 1: the output voltage specified above is the typical value. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 8 seiko instruments inc. 1-4. s-8324hxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8324h33mc 3.221 3.300 3.379 v 1 s-8324h50mc 4.880 5.000 5.120 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 1.4 oscillation start voltage v st2 no external parts, voltage applied to v out cont pulled up to 5 v by 10k ? ?? 1.3 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ?? 1 input current at no load i in no load s-8324h33mc ? 36.0 72.0 a ? s-8324h50mc ? 38.4 76.9 current consumption 1 i ss1 v out =output voltage 0.95 s-8324h33mc ? 87.9 146.5 2 s-8324h50mc ? 142.6 237.7 current consumption 2 i ss2 v out =output voltage+0.5 s-8324h33mc ? 10.0 19.9 s-8324h50mc ? 10.2 20.3 current consumption during shutdown i sss v on/off =0 v ?? 0.5 switching current i sw v cont =0.4 v s-8324h33mc 78 125 ma ? s-8324h50mc 114 182 switching transistor leak current i swq v out = v cont =10 v ?? 1.0 a line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage ? v out / ? ta ta=-40 c to +85 c s-8324h33mc ? 0.17 ? mv/ c temperature coefficient s-8324h50mc ? 0.25 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at cont pin 212.5 200 287.5 khz 2 max duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 70 78 85 % pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1 v no load 51524 1 shutdown pin v sh v out =output voltage 0.95 judged the oscillation at cont pin 0.75 ?? v2 input voltage (on/off type) v sl1 v out =output voltage 0.95 when v out 1.5 v ?? 0.3 v sl2 judged the stop of oscillation at cont pin when v out <1.5 v ?? 0.2 soft start time t ss 1.8 3.6 7.2 ms ? efficiency effi s-8324h33mc ? 83 ? %1 s-8324h50mc ? 87 ? external parts used: -coil: cd54 (22 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 9 1-5. s-8324jxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8324j25mc 2.440 2.500 2.560 v 1 s-8324j50mc 4.880 5.000 5.120 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 1.4 oscillation start voltage v st2 no external parts, voltage applied to v out contpulled up to 5 v by 10k ? ?? 1.3 2 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ?? 1 input current at no load i in no load s-8324j25mc ? 34.2 68.4 a ? s-8324j50mc ? 38.4 76.9 current consumption 1 i ss1 v out =output voltage 0.95 s-8324j25mc ? 64.8 108.0 2 s-8324j50mc ? 142.6 237.7 current consumption 2 i ss2 v out =output voltage+0.5 s-8324j25mc ? 9.9 19.7 s-8324j50mc ? 10.2 20.3 switching current i sw v cont =0.4 v s-8324j25mc 61 98 ? ma ? s-8324j50mc 114 182 ? switching transistor leak current i swq v out = v cont =10 v ?? 1.0 a line regulation ? v out1 v in = output voltage 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage ? v out / ? ta ta=-40 c to +85 c s-8324j25mc ? 0.13 ? mv/ c temperature coefficient s-8324j50mc ? 0.25 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at cont pin 212.5 250 287.5 khz 2 max duty ratio maxduty v out =output voltage 0.95 measured waveform at cont pin 70 78 85 % pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1 v no load 51524 1 soft start time t ss 1.8 3.6 7.2 ms ? efficiency effi s-8324j25mc ? 79 ? %1 s-8324j50mc ? 87 ? external parts used: -coil: cd54 (22 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 22 f, tantalum type) of nichicon corporation applied v in =output voltage 0.6, i out =output voltage/250 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd /v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more voltage for v dd is recommended to stabilize the output voltage and oscilation frequency. however, accuracy of volutage is degrated to 4% under the v dd volutage between 2.0 v to 2.35 v. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 10 seiko instruments inc. 2-1. s-8328bxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit out p ut volta g ev out s-8328b52mc 5.075 5.200 5.325 v 3 s-8328b50mc 4.880 5.000 5.120 s-8328b38mc 3.709 3.800 3.891 s-8328b36mc 3.514 3.600 3.686 s-8328b33mc 3.221 3.300 3.379 s-8328b30mc 2.928 3.000 3.072 s-8328b27mc 2.635 2.700 2.765 s-8328b26mc 2.538 2.600 2.662 s-8328b25mc 2.440 2.500 2.560 in p ut volta g ev in ?? 9 o p eration start volta g ev st1 i out =1 ma ?? 0.9 oscillation start volta g ev st2 no external p arts, volta g e a pp lied to v out ?? 0.8 4 o p eration holdin g volta g ev hld i out =1 ma, measured b y decreasin g v in volta g e g raduall y 0.7 ?? 3 current consum p tion 1 i ss1 v out =out p ut volta g e 0.95 s-8328b52mc ? 39.3 65.5 a4 s-8328b50mc ? 37.6 62.6 s-8328b38mc ? 27.6 46.0 s-8328b36mc ? 26.0 43.3 s-8328b33mc ? 23.7 39.5 s-8328b30mc ? 21.4 35.7 s-8328b27mc ? 19.2 32.0 s-8358b26mc ? 18.5 30.9 s-8328b25mc ? 17.8 29.7 current consum p tion 2 i ss2 v out =out p ut volta g e+0.5 s-8328b52mc ? 4.2 8.3 s-8328b50mc ? 4.2 8.3 s-8328b38mc ? 4.0 8.0 s-8328b36mc ? 4.0 7.9 s-8328b33mc ? 4.0 7.9 s-8328b30mc ? 3.9 7.8 s-8328b27mc ? 3.9 7.7 s-8328b26mc ? 3.9 7.7 s-8328b25mc ? 3.9 7.7 shutdown current i sss v on/off =0 v ?? 0.5 ext p in out p ut current i exth v ext =v out -0.4 v s-8328b52mc -5.3 -8.0 ? ma ? s-8328b50mc -5.3 -8.0 ? s-8328b38mc -3.5 -5.3 ? s-8328b36mc -3.5 -5.3 ? s-8328b33mc -3.5 -5.3 ? s-8328b30mc -3.5 -5.3 ? s-8328b27mc -2.7 -4.0 ? s-8328b26mc -2.7 -4.0 ? s-8328b25mc -2.7 -4.0 ? i extl v ext =0.4 v s-8328b52mc 10.7 16.0 ? s-8328b50mc 10.7 16.0 ? s-8328b38mc 7.0 10.5 ? s-8328b36mc 7.0 10.5 ? s-8328b33mc 7.0 10.5 ? s-8328b30mc 7.0 10.5 ? s-8328b27mc 5.3 8.0 ? s-8328b26mc 5.3 8.0 ? s-8328b25mc 5.3 8.0 ? line re g ulation ? v out1 v in =out p ut volta g e 0.4 to 0.6 ? 30 60 mv 3 load re g ulation ? v out2 i out =10 a to i out ( below ) 1.25 ? 30 60 out p ut volta g e ? v out / ? ta ta=-40 c to +85 c s-8328b52mc ? 0.26 ? mv/ c tem p erature s-8328b50mc ? 0.25 ? coefficient s-8328b38mc ? 0.19 ? s-8328b36mc ? 0.18 ? s-8328b33mc ? 0.17 ? s-8328b30mc ? 0.15 ? s-8328b27mc ? 0.14 ? s-8328b26mc ? 0.13 ? s-8328b25mc ? 0.13 ? oscillation fre q uenc y fosc v out =out p ut volta g e 0.95 measured waveform at ext p in 85 100 115 khz 4 max. dut y ratio maxdut y v out =out p ut volta g e 0.95 measured waveform at ext p in 75 83 90 % pwm/pfm control switch dut y ratio pfmdut y v in = out p ut volta g e -0.1 v no load 51524 3 shutdown p in v sh v out =out p ut volta g e 0.95 jud g ed the oscillation at ext p in 0.75 ?? v4 in p ut volta g e ( on/off t yp e ) v sl1 v out =out p ut volta g e 0.95 when v out 1.5 v ?? 0.3 v sl2 jud g ed the sto p of oscillation at ext p in when v out <1.5 v ?? 0.2 soft start time t ss 3.0 6.0 12.0 ms ? efficienc y effi s-8328b52mc ? 88 ? %3 s-8328b50mc ? 88 ? s-8328b38mc ? 84 ? s-8328b36mc ? 84 ? s-8328b33mc ? 84 ? s-8328b30mc ? 84 ? s-8328b27mc ? 80 ? s-8328b26mc ? 80 ? s-8328b25mc ? 80 ? external parts used: -coil: cd54 (47 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation -transistor: 2sd1628g of sanyo electric co., ltd. -base resistor (rb): 1.0 k ? -base capacitor (cb): 2200 pf (ceramic) discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 11 applied v in =output voltage 0.6, i out =output voltage/50 ? the shutdown pin is connected to vout pin. note 1 : the output voltage specified above is the typical value. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 12 seiko instruments inc. 2-2. s-8328bxxma, s-8328bxxua, s-8328exxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s-8328x50xx 4.880 5.000 5.120 v 3 s-8328x33xx 3.221 3.300 3.379 s-8328x30xx 2.928 3.000 3.072 s-8328x27xx 2.635 2.700 2.765 s-8328x25xx 2.440 2.500 2.560 s-8328x20xx 1.952 2.000 2.048 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 0.9 oscillation start voltage v st2 no external parts, voltage applied to v out ?? 0.8 4 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually 0.7 ?? 3 current consumption 1 i ss1 v out =output voltage 0.95 s-8328x50xx ? 37.6 62.6 a 4 s-8328x33xx ? 23.7 39.5 s-8328x30xx ? 21.4 35.7 s-8328x27xx ? 19.2 32.0 s-8328x25xx ? 17.8 29.7 s-8328x20xx ? 14.5 24.1 current consumption 2 i ss2 v out =output voltage+0.5 s-8328x50xx ? 4.2 8.3 s-8328x33xx ? 4.0 7.9 s-8328x30xx ? 3.9 7.8 s-8328x27xx ? 3.9 7.7 s-8328x25xx ? 3.9 7.7 s-8328x20xx ? 3.8 7.6 ext pin output current i exth vext=v out -0.4v s-8328x50xx -5.3 -8.0 ? ma ? s-8328x33xx -3.5 -5.3 ? s-8328x30xx -3.5 -5.3 ? s-8328x27xx -2.7 -4.0 ? s-8328x25xx -2.7 -4.0 ? s-8328x20xx -1.9 -2.9 ? i extl vext=0.4v s-8328x50xx 10.7 16.0 ? s-8328x33xx 7.0 10.5 ? s-8328x30xx 7.0 10.5 ? s-8328x27xx 5.3 8.0 ? s-8328x25xx 5.3 8.0 ? s-8328x20xx 3.8 5.7 ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 mv 3 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage ? v out / ? ta ta=-40 c to +85 c s-8328x50xx ? 0.25 ? mv/ c temperature s-8328x33xx ? 0.17 ? coefficient s-8328x30xx ? 0.15 ? s-8328x27xx ? 0.14 ? s-8328x25xx ? 0.13 ? s-8328x20xx ? 0.10 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at ext pin 85 100 115 khz max. duty ratio maxduty v out =output voltage 0.95 measured waveform at ext pin 75 83 90 % 4 pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1v no load 51524 3 soft start time tss 3.0 6.0 12.0 ms ? efficiency effi s-8328x50xx ? 88 ? %3 s-8328x33xx ? 84 ? s-8328x30xx ? 84 ? s-8328x27xx ? 80 ? s-8328x25xx ? 80 ? s-8328x20xx ? 76 ? external parts used: -coil: cd54 (47 h) of sumida corporation -diode: ma720 (schottky type) of matsushita electric industrial co., ltd. -capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation -transistor: 2sd1628g of sanyo electric co., ltd. -base resistor (rb): 1.0 k ? -base capacitor (cb): 2200 pf (ceramic) applied v in =output voltage 0.6, i out =output voltage/50 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd /v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more voltage for v dd is recommended to stabilize the output voltage and oscilation frequency. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 13 2-3. s-8328hxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit out p ut volta g ev out s-8328h30mc 2.928 3.000 3.072 v 3 s-8328h33mc 3.221 3.300 3.379 s-8328h50mc 4.880 5.000 5.120 in p ut volta g ev in ?? 9 o p eration start volta g ev st1 i out =1 ma ?? 1.4 oscillation start volta g ev st2 no external p arts, volta g e a pp lied to v out ?? 1.3 4 o p eration holdin g volta g ev hld i out =1 ma, measured b y decreasin g v in volta g e g raduall y . 0.7 ?? 3 current consum p tion 1 i ss1 s-8328h30mc ? 53.9 89.8 a4 v out =out p ut volta g e 0.95 s-8328h33mc ? 59.4 99.0 s-8328h50mc ? 93.7 156.1 current consum p tion 2 i ss2 s-8328h30mc ? 10.0 19.9 v out =out p ut volta g e+0.5 s-8328h33mc ? 10.0 19.9 s-8328h50mc ? 10.2 20.3 current consum p tion while shutdown i sss v on/off =0 v ?? 0.5 ext p in out p ut current i exth v ext =v out -0.4 v s-8328h30mc -3.5 -5.3 ? ma ? s-8328h33mc -3.5 -5.3 ? s-8328h50mc -5.3 -8.0 ? i extl v ext =0.4 v s-8328h30mc 7.0 10.5 ? s-8328h33mc 7.0 10.5 ? s-8328h50mc 10.7 16.0 ? line re g ulation ? v out1 v in =out p ut volta g e 0.4 to 0.6 ? 30 60 mv 3 load re g ulation ? v out2 i out =10 a to i out ( below ) 1.25 ? 30 60 out p ut volta g e tem p erature ? v out / ? ta ta=-40 c to +85 c s-8328h30mc ? 0.15 ? mv/ c coefficient s-8328h33mc ? 0.17 ? s-8328h50mc ? 0.25 ? oscillation fre q uenc y fosc v out =out p ut volta g e 0.95 measure waveform at ext p in 212.5 250 287.5 khz 4 max. dut y ratio maxdut y v out =out p ut volta g e 0.95 measure waveform at ext p in 70 78 85 % pwm/pfm control switch dut y ratio pfmdut y v in = out p ut volta g e -0.1 v no load 51524 shutdown p in in p ut volta g ev sh v out =out p ut volta g e 0.95 0.75 ?? v ( on/off t yp e ) v sl1 v out =out p ut volta g e 0.95 when v out 1.5 v ?? 0.3 v sl2 when v out <1.5 v ?? 0.2 soft start time t ss 1.5 3.0 6.0 ms ? efficienc y effi s-8328h30mc ? 81 ? %3 s-8328h33mc ? 81 ? s-8328h50mc ? 85 ? external parts used: - coil: cd54 (22 h) of sumida corporation - diode: ma720 (schottky type) of matsushita electric industrial co., ltd. - capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation - transistor: nds355an of national semiconductor applied v in =output voltage 0.6, i out =output voltage/50 ? the shutdown pin is connected to vout pin. note 1: the output voltage specified above is the typical value. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 14 seiko instruments inc. 2-4. s-8328jxxmc (unless otherwise specified: ta=25 c) parameter symbol conditions min. typ. max. unit test circuit output voltage v out s- 8328j25mc 2.440 2.500 2.560 v 3 s- 8328j50mc 4.880 5.000 5.120 input voltage v in ?? 9 operation start voltage v st1 i out =1 ma ?? 1.4 oscillation start voltage v st2 no external parts, voltage applied to v out ?? 1.3 4 operation holding voltage v hld i out =1 ma, measured by decreasing v in voltage gradually b. 0.7 ?? 3 current consumption 1 i ss1 v out =output voltage 0.95 s- 8328j25mc ? 44.9 74.8 a 4 s- 8328j50mc ? 93.7 156.1 current consumption 2 i ss2 v out =output voltage+0.5 s- 8328j25mc ? 9.9 19.7 s- 8328j50mc ? 10.2 20.3 ext pin output current i exth v ext =v out -0.4 v s- 8328j25mc -2.3 -4.0 ? ma ? s- 8328j50mc -5.3 -8.0 ? i extl v ext =-0.4 v s- 8328j25mc 5.3 8.0 ? s- 8328j50mc 10.7 16.0 ? line regulation ? v out1 v in =output voltage 0.4 to 0.6 ? 30 60 mv 3 load regulation ? v out2 i out =10 a to i out (below) 1.25 ? 30 60 output voltage ? v out / ? ta ta=-40 c to +85 c s- 8328j25mc ? 0.13 ? mv/ c temperature coefficient s- 8328j50mc ? 0.25 ? oscillation frequency fosc v out =output voltage 0.95 measured waveform at ext pin 212.5 250 287.5 khz 4 max. duty ratio maxduty v out =output voltage 0.95 measured waveform at ext pin 70 78 85 % pwm/pfm control switch duty ratio pfmduty v in = output voltage -0.1 v no load 51524 soft start time t ss 1.5 3.0 6.0 ms ? efficiency effi s- 8328j25mc ? 77 ? %3 s- 8328j50mc ? 85 ? external parts used: - coil: cd54 (22 h) of sumida corporation - diode: ma720 (schottky type) of matsushita electric industrial co., ltd. - capacitor: f93 (16 v, 47 f, tantalum type) of nichicon corporation - transistor: nds355an of national semiconductor applied v in =output voltage 0.6, i out =output voltage/50 ? the vdd pin is connected to vout pin for v dd /v out separate product. note 1: the output voltage specified above is the typical value. note 2: v dd/ v out separate products: boot operation is performed from v dd =0.8 v. however, 2.0 v or more for v dd is recommended to stabilize the output voltage and oscilation frequency. however, accuracy of volutage is degrated to 4% under the v dd volutage between 2.0 v to 2.35 v. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 15 ? ?? ? test circuits ? ?? ? operation 1. step-up dc/dc converter the s-8324/8328 series is a dc/dc converter using a pulse frequency modulation method (pfm) or a pulse width modulation method (pwm) which are switched automatically according to the load current with a low current consumption. especially in the region of 100 a output load current, a high-efficiency dc/dc converter is obtained. in conventional fixed-duty type pfm dc/dc converters, pulses are skipped at low output load current, causing fluctuation in rip ple frequency of the output voltage, with the result of increase in ripple voltage. the s-8324/8328 series operates with the pwm control which changes the pulse width duty from 15% to 83%(78% for h, j types) in the region of large output load current. the ripple voltage generated from switching can be removed easily through the filter because the switching frequency is constan t. the s-8324/8328 series operates with the pfm control which skips the pulse of the duty 15% pulth width and output that pulse to the switching transistor according to the load current. from the above operation, the self current consumption is reduced from the blocking oscilation of the oscilation circuit, and a fall of efficiency can be protected in small load. the switching point between pwm and pfm control differs according to the external elements (coil, diode and other), input voltage and output voltage. see reference data about this. shutdown pin: stops or starts step-up operation. (only for sot-23-5 package products of a, b, and h series.) turning the shutdown pin low stops operation of all the internal circuits and reduces current consumption significantly. do not use the shutdown pin in floating state because it has a structure shown in figure 4 and is not pulled up or pulled down internally. do not apply voltage of between 0.3 v and 0.75 v to the shutdown pin because applying such voltage increases the current consumption. if the shutdown pin is not used, connect it to v out (v dd for d, e, j types) pin. the shutdown pin doesn?t have hysteresis. shutdown pin cr oscillation circuit output voltage ?h? operation fixed ?l? stop ? v in * * voltage obtained by extracting the voltage drop due to dc resistance of the inductor and the diode forward voltage from v in. 1. vss vout cont v - + - + (on/off) (vdd) 3. vss vout v - + - + (on/off) rb ext cb (vdd) figure 3 figure 3 oscilloscope 2. vss (on/off) vou cont 10 k - + a (vdd) 4. oscilloscope vss (on/off) vout - + a ext (vdd) on/off v out ( v dd for d, e, j t yp es ) v ss figure 4 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 16 seiko instruments inc. + + - osc c out cont m1 v in l va di on/off v out figure 5 the following are basic equations [(1) through (7)] of the step-up switching regulator (see figure 5.) voltage at cont pin the moment m1 is turned on (current i l flowing through l is zero): the change in i l over time: di l v l v in - v s ?? = ?? = ????? ...................................................... (2) d l l integration of the above equation (i l ): v in - v s i l = ???? y t .............................................................. (3) l i l flows while m1 is turned on (t on ). the time of t on is determined by the oscillation frequency of the osc. the peak current (i pk ) after ton: v in - v s i pk = ???? y t on .......................................................... (4) l the energy stored in l is represented with 1/2 y l (i pk ) 2 . when m1 is turned off (t off ), the energy stored in l is transmitted through a diode to the output capacitor. then reverse voltage (v l ) is generated. v l = (v out +v d ) - v in .......................................................................... (5) (v d : diode forward voltage) the voltage at cont pin rises only by the voltage corresponding to v out +v d . the change in the current flowing through the diode into v out during t off : di l v l v out + v d - v in ?? = ?? = ??????? .............................................. (6) d l l integration of the above equation is as follows: v out +v d -v in i l =i pk - ?????? y t .................................................... (7) l v a =v s ................................................................................ (1) (v s : non-saturated voltage of m1) discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 17 during t on , the energy is stored in l and is not transmitted to v out . when receiving output current (i out ) from v out , the energy of the capacitor (c out ) is consumed. as a result, the pin voltage of c out is reduced, and goes to the lowest level after m1 is turned on (t on ). when m1 is turned off, the energy stored in l is transmitted through the diode to c out , and the voltage of c out rises drastically. v out is a time function that indicates the maximum value (ripple voltage: v p-p ) when the current flowing through the diode into v out and load current (i out ) match. next, the ripple voltage is found out as follows: i out vs t 1 (time) from when m1 is turned off ( after t on ) to when v out reaches the maximum level: v out +v d -v in i out =i pk - ?????? y t 1 ............................................. (8) l l t 1 =(i pk -i out ) y ?????? ......................................... (9) v out +v d -v in after (t off ), i l =0 (when the energy of the inductor is completely transmitted). based on equation (7), l t off ?????? = ?? ....................................................(10) v out +v d -v in i pk when substituting equation (10) for equation (9), i out t 1 =t off - ??? y t off .................................................(11) i pk electric charge ? q 1 which is charged in c out during t1: v out +v d -v in ? q 1 = i l dt= i pk ? dt - ?????? ? tdt l v out +v d -v in 1 = i pk ? t 1 - ?????? ? ? t 1 2 .................................(12) l 2 t 1 0 t 1 0 t 1 0 when substituting equation (12) for equation (9): 1 i pk +i out ? q 1 =i pk - ? (i pk - i out ) y t 1 = ????? y t 1 .....................(13) 2 2 a rise in voltage (v p-p ) due to ? q 1 : ? q 1 1 i pk +i out v p-p = ??? = ??? y ????? y t 1 .......................(14) c out c out 2 when taking into consideration i out to be consumed during t1 and esr (equivalent series resistance) of c out , namely r esr : ? q 1 1 i pk +i out i pk +i out i out y t 1 v p-p = ??? = ?? y ???? y t 1 + ???? y r esr - ???? .........................(15) c out c out 2 2 c out when substituting equation (11) for equation (15): (i pk -i out ) 2 t off i pk +i out v p-p = ???? y ?? + ????? y r esr ..................(16) 2i pk c out 2 therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity and a small esr. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 18 seiko instruments inc. ? ?? ? external parts selection for dc-dc converter the relationship between majorcharacteristics of the step-up circuit and characteristics parameters of the external parts are s hown in figure 6. for large output current? for high efficiency? for small ripple voltage operation efficiency stand-by efficiency figure 6 relationship between major character stics of the step-up circuit and external parts small inductance large inductance small dc resistance of inductor large output capacitance built-in switching transistor external switching transistor (small on resistance) small resistance of external resistor rb when an external switching transistor is used large resistance of external resistor rb when an external switching transistor is used ? discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 19 1. inductor an inductance has strong influence on max. output current i out and efficiency . figure 7 shows i out characteristics for inductance of s-8324 and s-8328. figure 7 the peak current i pk increases by decreasing l and i out is at max. value at l value. further decreasing l decreases i out due to the lack of the current driving capacity of the switching transistor. the loss of i pk by the switching transistor decreases by increasing l and the efficiency becomes max. at l value. further increasing l decreases efficiency due to the loss of the dc resistance of the coil. 47 to 220 h inductor for s-8324 a/b/c/d/e and 22 to 100 h inductor for s-8328 a/b/c/d/e, 10 to 22 h inductor for s-8324 h/j, and 4.7 to 10 h inductor for s-8328 h/j are recommended. choose a value for l by refering to the reference data because the maximum output current is due to the input voltage in an act ual case. choose an inductor so that the peak current i pk does not exceed the allowable current. exceeding the allowable current of the inductor causes magnetic saturation, remarkable low efficiency and destruction of the ic chip due to a large current. the peak current i pk in uncontinuous mode is caluculated from the following formula: i pk = fosc: oscillation frequency vd ? 0.4v for instance, when you choose 100 h at fosc=50 khz for l using the s-8324a 50mc at the following conditions, i pk is caluculated to 170 ma from the (17) formula. ? input voltage v in =3 v ? output voltage v out =5 v ? load current i out =30 ma the switching current limit circuit is not built into this ic chip. i pk current must be 500 ma or less. 2 i out (v out +v d -v in ) f osc ? l (a) (17) s-8324 a/b/c/d/e i out d75c i out 47 220 recommended range recommended range l ( h ) v out =5.0v, v in =3.0v s-8328 a/b/c/d/e i out cd105 i out 22 100 l ( h ) v out =5.0v, v in =3.0v discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 20 seiko instruments inc. 2. diode use an external diode that meets the following requirements: ? low forward voltage: (v f <0.3v) ? high switching speed: (50 ns max.) ? reverse voltage: v out +v f or more ? rated current: i pk or more 3. capacitors (c in , c out ) a capacitor at the input side (c in ) improves the efficiency by reducing the power impedance and stabilizing the input current. select a c in value according to the impedance of the power supply used. the capacitor value should be around 10 f. a capacitor at the output side (c out ) is used for smoothing the ripple voltage. therefore select a capacitor with a small esr (equivalent series resistance) and a large capacitance. the capacitor value should be 10 f min. a tantalum electrolytic capacitor and an organic semiconductor capacitor are especially recommended because of their superior low-temperature characteristic and leakage current characteristic. 4. external transistor (s-8328 series) for the s-8328 series, connecting an external transistor increases the output current. a bipolar (npn) transistor or an enhancement (n-channel) mos fet transistor can be used as external transistor. 4.1. bipolar (npn) transistor a circuit example using a bipolar transistor (npn), sanyo 2sd1628g (h fe =280 to 560) is shown in figure 11. the h fe value and the rb value determine the driving capacity to increase the output current using a bipolar transistor. a peripheral circui t example of the transistor is shown in figure 8. 1 k ? is recommended for rb. rb is caluculated from the following formula: v out -0.7 0.4 v dd -0.7 0.4 rb= ???? - ??? (rb= ???? - ??? for d, e, j types) ib |i exth | ib |i exth | ib=i pk /h fe a small rb increases output current, however, the efficiency decreases. the current flows pulsating and there is voltage drop due to wiring resistance in an actual circuit, therefore optimum rb value should be determined by experiment. a speed-up capacitor connected in parallel with rb resistance as shown in figure 9 decreases the switching loss and improves the efficiency. cb is caluculated from the following formula: 1 cb ????????? 2 rb f osc 0.7 however, in practice, the optimum cb value also varies with the characteristics of the bipolar transistor to be employed. therefore, determine the optimum value through experiments. figure 8 external transistor peripheral v out (v dd for d, e, j types) i pk ext 1k nch pch rb s-8328 2200pf cb discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 21 ?? 4.2. enhancement mos fet type 5. others (s-8324d/j and s-8328e/j only) the s-8324d/j and s-8328e/j are applicable to the following uses because the power pin for ic chip and vout pin for output voltage are separated: c when changing the output voltage with an external resistance. d when outputing the high voltage such as +12 v or 15 v. e when making the step-down dc/dc converter. f when making the inverted dc/dc converter. choose the products in the following table according to applications for c to e . use step-up step-down output voltage v cc 2v v cc <3v 3v v cc <5v 5v v cc <9v 9v v cc ref. circuit 2v v cc <3v 3v v cc <5v 5v v cc <9v ref. circuit s-8324d20 { ??? std. circuit (5) { ?? appl. circuit 3 s-8324d30 ? { ?? std. circuit (5) ? { ? appl. circuit 3 s-8324d50 ?? { ? std. circuit (5) ?? { appl. circuit 3 s-8324j25 ? { ?? std. circuit (5) ??? ? s-8324j50 ?? { ? std. circuit (5) ??? ? s-8328e20 {{{{ std. circuit (6) ??? ? s-8328e50 ?? {{ std. circuit (6) ??? ? s-8328j25 ? {{{ std. circuit (6) ??? ? s-8328j50 ?? {{ std. circuit (6) ??? ? connection to v dd pin v in or v cc v in or v cc v in or v cc v in ? v in v in v in ? the operational precautions are follows: i. this ic starts to oscillate and step up operation at v dd =0.8v(1.3v for j-type) but frequency of the oscillator does not stabilize. input the voltage from 2 v to 9 v for v dd pin to get the stabilized output voltage and oscilation frequency. the input voltage from 2 v to 9 v for v dd pin allows the connection of v dd pin to both input power pin v in and output power pin vout. ii. choose external resistors r a and r b not to affect to the output voltage with the consideration of the impedance between v out and v ss pins in the ic chip. internal resistance between v out and v ss pins are as follows: c s-8324d20, s-8324j20, and s-8328e20: 3.0 m ? to 19.6 m ? d s-8324j25, s-8328j25: 3.9 m ? to 22.5 m ? e s-8324d30: 3.3 m ? to 22.6 m ? f s-8324d50, s-8324j50, s-8328e50, and 8328j50: 2.1 m ? to 19.1 m ? iii. attach the capacitor ?c c ? in parallel to r a resistance when the oscilation of the output voltage occurs. caluculate ?c c ? from the following formula: figure 9 circuit example using 2sk1959 figure 9 is a circuit example using nec 2sk1959 mos fet transistor (n-channel). for a mos fet, an n-channel power mos fet should be used. because the gate voltage and current of the external power mos fet are supplied from the stepped up output voltage v out , the mos fet is driven more effectively. depending on which mos fet you use in your device, there is a chance of a current overrun at power on. thoroughly test all settings with your device before deciding on which one to use. also, try to use a mos fet with the gate capacitance of 300 pf or less. since the on resistor of the mos fet might affect the output amperage as well as the efficiency, the threshold voltage should be low. when the output voltage is as low as 2.0v the same as in the s-8328e20, the circuit operates only when the mos fet has the threshold voltage lower than 2.0v. v out ext v out - + (on / off) (v dd ) v ss + - c c (f)= 2 ? ? r a ? 20 khz 1 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 22 seiko instruments inc. iv. when the device is used with an external resistance in the output voltages-variable mode, a large ripple voltage having a frequency lower than that of the switching frequency may appear as an output, if the load current is large, depending on the circuit patterns on the evaluation board and other factors (the interval is several times or a few tens times as large as the switching interval (4 s), see waves in figure 10). be sure to check the circuit patterns on your board in advance for practical use. -30 -20 -10 0 10 20 -25 -20 -15 -10 -5 0 5 10 15 20 25 time ( sec ) cont pin voltage (v) -2 0 2 4 6 8 coil current ( a ) cont pin voltage (v) coil current (a) figure 10 discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 23 ? ?? ? standard circuits figure 11 figure 12 figure 13 (3) s-8324axxma s-8324axxua s-8324cxxma pwm control circuit vref + - lcont sd v out v in v ss on / off - + c out - + c in soft start circuit note: the power supply for ic chip is supplied from v out pin. pwm control circuit vref + - sd v out v ss - + c out 2200pf 1 k ? l v in - + c in on / off ext soft start circuit note: the power supply for ic chip is supplied from v out pin. pwm control circuit vref + - lcont sd v out v in v ss - + c out - + c in soft start circuit note: the power supply for ic chip is supplied from v out pin. (1) s-8324axxmc (2) s-8328bxxmc s-8328hxxmc discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 24 seiko instruments inc. (4) s-8328bxxma s-8328bxxua figure 14 figure 15 (5) s-8324dxxmc (output voltage adjustment circuit with external resistors) s-8324jxxmc (6) s-8328exxmc (output voltage adjustment circuit with external resistors) s-8328jxxmc figure 16 pwm control circuit vref + - sd v out v ss - + c out 2200pf 1k ? v in - + c in ext soft start circuit v out l note: the power supply for ic chip is supplied from v out pin. v cc pwm control circuit vref + - lcont sd v dd v in - + c out - + c in soft start circuit c c v out v ss r b r a r 1 r 2 note: the power supply for ic chip is supplied from v dd pin. v cc pwm control circuit + - sd 2200pf 1k ? v in - + c in ext soft start circuit v dd - + c out c c v out v ss r b r a l r 1 r 2 note: the power supply for ic chip is supplied from v dd pin. vref discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 25 (7) s-8328jxxmc r 1 r 2 pwm control circuit vref + - sd v out v ss - + c out v in - + c in ext soft start circuit n ote: the power supply for ic chip is supplied from v dd pin. l v dd (8) s-8328hxxmc vref + - v ss - + c out v in - + c in ext n o t e: the power supply for ic chip is supplied from v out pin. l v out on / off - soft start circuit pwm control circuit sd vref ? ?? ? precautions mount external capacitors, a diode, and a coil as near as possible to the ic. ripple voltage and spike noise occur in switching regulators. because they largely depend on the coil and the capacitor used, check them using an actually mounted model. the performance of this ic varies depending on the pcb patterns, peripheral circuits or external parts. thoroughly test all settings with your device. also, try to use recommended external parts. if not, contact your local sii sales office. seiko instruments shall not be responsible for any patent infringement by products including s-8324/8328 series in connection with the method of using s-8324/8328 series in such products, the specification of such products, or the country of destination thereof. make sure dissipation of the switching transistor (especially at a high temperatures) does not exceed the allowable power dissipation of the package. figure 17 figure 18 figure 19 power dissipation of the package (before mounting) amb. temperature ta ( c) power dissipation p d (mw) 600 400 200 0 050 100 150 sot-23-5, sot-23-3 sot-89-3 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 26 seiko instruments inc. ? ?? ? application circuits 1. backup circuit reduces the backup battery voltage from 3 v to 1.5 v (from 2 cells to 1 cell). 2. 5v/backup change the s-8324a/8328b is provided with a power off function, where v out becomes approx. v in -0.6v. this characteriistic allows the backup voltage of the microcomputer to be supplied with low current consumption. 3. step-down dc/dc converter the start circuit is not needed because the power supply is supplied from v dd to the ic. the maximum input voltage for v dd is 9 v. do not mount r a and r b resistors when v cc is 2v for s-8324d20mc, 3v for s-8324d30mc, and 5v for s-8324d50mc. the external resistor rb must be 60 ? or more and r e must be 6k ? or less. a large value for r e raises efficiency due to the reduction of reactive current for r e and r b . too large value of r e lowers efficiency due to the large switching loss of the external transistor (tr). choose a suitable value of r e under the operating conditions. figure 20 cont on/off s-8324a v out v ss - + - + s-ram 1.5v main power figure 21 figure 22 v dd s-8324d - + - + v out v ss c out r e r b cont c in v in tr v cc r a r b c c cont on/off s-8324a v out v ss - + - + voltage detector ce cpu v in discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 27 4. pda/digital camera power supply the following are a circuit example and its characteristics showing a 3-v system drive (3v/200ma) powered by 4 secondary nicd batteries (3.6 to 4.8v), 2 lithium-ion batteries (4.8 to 8.8v) or 4 alkaline-manganese batteries (3.6 to 6.0v). vin =3.3 v vin =3.6 v vin =4.8 v vin =7.2 v vin =3.3 v vin =3.6 v vin =4.8 v vin =7.2 v (a) output current - output voltage (b) output current - efficiency 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. output current i out (ma) output voltage v out (v) 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. efficiency (%) output current i out (ma) figure 24 t (10 sec/div) output voltage (10mv/div) 0v point a voltage (1v/div) 3v vin=3.6v iout=300ma (c) ripple characteristics figure 25 v dd s-8324d30 - + - + v out v ss c out r e r b cont c in v in 3v 2sa1213/toshiba 5.1k ? 750 ? a ma720 sd cd54/100 h f93 22 f l figure 23 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 28 seiko instruments inc. 5. voltage inverting type dc/dc converter the start circuit is not needed because the power is supplied from v dd to the ic. set v in to 9v-|v cc | or less. when v cc is -2 v, - 3 v and - 5 v, use the s-8324d20mc, the s-8324d30mc and the s-8324d50mc respectively. always connect v out to gnd without attaching r a , r b . set r b to 60 ? or more and r e to 6 k ? or less. the larger r e , the smaller the reactive current through r e and r b , allowing the efficiency to be improved. on the other hand, the switching loss of the tr becomes large and consequently the efficiency will be worsend. select r e to ensure high efficiency under operating conditions. 6. power supply for gaas and mr head the following are an application negative power supply circuit for gaas and mr head, and its characteristics when -3v (-3v 10%) and -5v (-5v 10%) are used for the applied power. set v in to 9v-|v cc | or less. (a) output current - output voltage (b) output current - efficiency output current i out (ma) output voltage v cc (v) efficiency (%) output current i out (ma) -3.05 -3.03 -3.01 -2.99 -2.97 -2.95 0.01 0.1 1. 10. 100. vin =2.7 v vin =3.0 v vin =4.5 v vin =5.0 v 0 20 40 60 80 100 0.01 0.1 1. 10. 100. vin =2.7 v vin =3.0 v vin =4.5 v vin =5.0 v figure 28 figure 27 v dd s-8324d30 - + + - v ss v out c out r e r b cont c in v in -3v 2sa1362/toshiba 750 ? 2k ? a cd54/100 h f93 47 f ma720 sd v cc figure 26 v dd s-8324d - + + - v ss v out c out r e r b cont c in v in tr v cc r b r a discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 29 t (10 sec/div) (10mv/div) 0v -3v point a voltage (2v/div) output voltage (c) ripple characteristics figure 29 when output current i out exceeds 50 ma, the current capacitance in the external transistor 2sa1362 becomes in short supply and the ic may be broken. select a large current capacitance transistor. the start circuit is not needed because the power supply is supplied from v dd to the ic. set vin to 9 v - |v cc | or less. the output voltage cannot be changed with external resistors. set r b to 60 ? or more and r e to 6 k ? or less. the larger r e , the smaller the reactive current through r e and r b , allowing the efficiency to be improved. on the other hand, the switching loss of the tr becomes large and consequently the efficiency will be worsened. select r e to ensure high efficiency under operating conditions. 7. lcd power supply (standard circuit (6)) the following are an application power supply circuit (30v/5ma) for intermidiate and large size lcd, and its characteristics wh en 3v (3v 10%) and 5v (5v 10%) are used for the applied power. s-8328e50 - + - + v out 4.7 f/50v 2 ext c in v in to 30v f93 c out cd54/100 h 1k ? 0.022 f r b v ss 2sd1624t ma720 sd l cb v dd r a 100k ? c c 15pf 482k ? r b figure 30 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 30 seiko instruments inc. 27 28 29 30 31 32 33 0.01 0.1 1. 10. 100. vin =2.7 v vin =3.0 v vin =4.5 v vin =5.0 v 0 20 40 60 80 100 0.01 0.1 1. 10. 100. vin =2.7 v vin =3.0 v vin =4.5 v vin =5.0 v (a) output current - output voltage (b) output current - efficiency output current i out (ma) output voltage v out (v) efficiency (%) output current i out (ma) figure 31 8. flash memory power supply the following are a circuit example and its characteristics for a 5 v flash memory, 16 mbit (5v/120ma) on a single lithium batt ery (2.4 v to 4.4 v). 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin =2.0 v vin =2.4 v vin =3.6 v vin =4.4 v 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. vin =2.0 v vin =2.4 v vin =3.6 v vin =4.4 v (a) output current - output voltage (b) output current - efficiency output current i out (ma) output voltage v out (v) efficiency (%) output current i out (ma) figure 33 s-8328b50 - + - + v out 47 f ext c in v in 5v f93 c out cd54/47 h 1 k ? 0.0022 f r b on/off control signal v ss ma720 sd l 2sd1628g cb figure 32 discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 31 9. power supply for ccd the follows are a circuit example and its characteristics for ccd power supply (+15, -5.5v/10ma) powered by 4 alkaline- manganese batteries (3.6-6.0v), used for digital still cameras and others. s-8328e vss - + - + - + v in co1 co2 /f93 10u 10u cee93 10 30 11 m a720 m a720 100u 100uh v dd v out ex t c in nds335n k k ra 270 rb 140 cc 30p /f93 v out + +15v v out - -5.5v tr1 figure 34 (a) output current - output voltage (positive output) (b) output current - output voltage (negative output) 14 14.4 14.8 15.2 15.6 16 0.1 1 10 100 vin= 3.0 v vin= 3.6 v vin= 6.0 v output voltage v out (v) output current i out (ma) -6.5 -6.1 -5.7 -5.3 -4.9 -4.5 0.1 1 10 100 vin=3.0 v vin=3.6 v vin=6.0 v output voltage v out (v) output current i out (ma) (c) output current - efficiency 0 20 40 60 80 100 0.1 1 10 100 output current i out (ma) efficiency (%) vin= 3.0v vin= 3.6v vin= 6.0v figure 35 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 32 seiko instruments inc. ? ?? ? temperature characteristics v st1 - ta v st2 - ta i ss1 - ta i ss2 - ta i sss - ta i sw - ta i swq - ta f osc - ta 20 80 60 40 0 -20-40 100 0.0 v out =3.0v, fosc=50khz type 1.2 1.0 0.8 0.6 0.4 0.2 v st1 (v) ta ( c) s-8324 20 80 60 40 0 -20-40 100 0.0 v out =3.0v, fosc=50khz type 0.2 0.4 0.6 0.8 1.0 v st2 (v) ta ( c) s-8324 20 80 60 40 0 -20-40 100 0 v out =3.0v, fosc=50khz type 10 20 30 40 50 ta ( c) i ss1 ( a) s-8324 20 80 60 40 0 -20-40 100 0 v out =3.0v, fosc=50khz type 1 2 3 4 5 ta ( c) i ss2 ( a) s-8324 s-8324 20 80 60 40 0 -20-40 100 0.0 v out =3.0v, fosc=50khz type 0.2 0.4 0.6 0.8 1.0 ta ( c) i sss ( a) s-8324 20 80 60 40 0 -20-40 100 0 v out =3.0v, fosc=50khz type 200 175 150 125 100 75 50 25 ta ( c) i sw (ma) 20 80 60 40 0 -20-40 100 0.0 v out =3.0v, fosc=50khz type 0.2 0.4 0.6 0.8 1.0 i swq ( a) s-8324 ta ( c) 20 80 60 40 0 -20-40 100 30 v out =3.0v, fosc=50khz type 70 65 60 55 50 45 40 35 fosc (khz) s-8324 ta ( c) discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 33 maxduty - ta pfmduty - ta v sh - ta v sl1 - ta v sl2 - ta t ss - ta i exth - ta i extl - ta 20 80 60 40 0 -20-40 100 0.0 s-8324 v out =3.0v, fosc=50khz type 0.2 0.4 0.6 0.8 1.0 v sh (v) ta ( c) 20 80 60 40 0 -20-40 100 0.0 s-8324 v out =3.0v, fosc=50khz type 0.2 0.4 0.6 0.8 1.0 v sl1 (v) ta ( c) 20 80 60 40 0 -20-40 100 0.0 s-8324 v out =3.0v, fosc=50khz type 0.2 0.4 0.6 0.8 1.0 ta ( c) v sl2 (v) 20 80 60 40 0 -20-40 100 s-8324 v out =3.0v, fosc=50khz type 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 ta ( c) t ss (ms) s-8328 20 80 60 40 0 -20-40 100 -0 v out =3.0v, fosc=100khz type -16 -14 -12 -10 -8 -6 -4 -2 i exth (ma) ta ( c) s-8328 v out =3.0v, fosc=100khz type 20 80 60 40 0 -20-40 100 0 16 14 12 10 8 6 4 2 i extl (ma) ta ( c) s-8324 v out =3.0v, fosc=50khz type 20 80 60 40 0 -20-40 100 50 60 70 80 90 100 maxduty (%) ta ( c) 20 80 60 40 0 -20-40 100 v out =3.0v, fosc=50khz type 0 s-8324 40 35 30 25 20 15 10 5 pfmduty (%) ta ( c) discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 34 seiko instruments inc. v st1 - ta v st2 - ta s-8324 v out =3.3v, fosc=250khz type s-8324 v out =3.3v, fosc=250khz type 0.0 0.2 0.4 0.6 0.8 1.0 1.2 -40 -20 0 20 40 60 80 100 ta( c) v st (v) 0 0.2 0.4 0.6 0.8 1 -40-20 0 20406080100 ta( c) v st2 (v) i ss1 - ta i ss2 - ta s-8324 v out =3.3v, fosc=250khz type s-8324 v out =3.3v, fosc=250khz type 0 20 40 60 80 100 i ss1 ( a) -40 -20 0 20 40 60 80 100 ta( c) 0 2 4 6 8 10 12 i ss2 ( a) -40 -20 0 20 40 60 80 100 ta( c) f osc - ta maxduty - ta s-8324 v out =3.3v, fosc=250khz type s-8324 v out =3.3v, fosc=250khz type 220 230 240 250 260 270 280 -40 -20 0 20 40 60 80 100 ta( c) fosc (khz) 50 60 70 80 90 100 -40 -20 0 20 40 60 80 100 ma xd u ty(% ) ta( c) discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 35 ? ?? ? characteristics for the power voltage i ss1 , 2 - v dd i sw - v out f osc - v dd i ss1 , 2 -v dd f osc - v dd s-8324j50 ta=25 c, v out =5.0v, fosc=250khz type s-834j50 ta=25 c, v out =5.0v, fosc=250khz type 0 100 200 300 0246810 v dd (v) iss1 iss2 ( a) 100 200 300 012345 v dd (v) fosc (khz) s-8324 1 4 3 2 0 5 0 ta=25 c, v out =5.0v, fosc=50khz type 50 100 150 200 250 v dd (v) i sw (ma) 1 4 3 2 0 5 30 s-8324 ta=25 c, v out =5.0v, fosc=50khz type 40 50 60 70 f osc (khz) v dd (v) 2 8 6 4 0 10 0 s-8324 ta=25 c, v out =5.0v, fosc=50khz type 10 20 30 40 50 v dd (v) i ss1 i ss2 ( a) discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 36 seiko instruments inc. ? ?? ? ripple characteristics s-8324a30 1. light load (i out =200 a) v in =1.8v t (5 sec/div) output vol tag e ( 10mv/div ) 0v 3v cont vol tag e (1v/div) v in =1.8v t (20 sec/div) output vol tag e (10mv/div) 0v 3v cont vol tag e (1v/div) 2. medium load (i out =10ma) v in =1.8v t (10 sec/div) output voltage ( 10mv/div ) 0v 3v cont voltage (1v/div) 3. heavy load (i out =60ma) v in =1.8v t (10 sec/div) output voltage (20mv/div) 0v 3v cont voltage (1v/div) s-8328b30 1. light load (i out =200 a) v in =1.8v t (5 sec/div) output voltage ( 10mv/div ) 0v 3v cont voltage (1v/div) v in =1.8v t (100 sec/div) output voltage (10mv/div) 0v 3v cont voltage (1v/div) 2. medium load (i out =10ma) v in =1.8v t (5 sec/div) output voltage ( 10mv/div ) 0v 3v cont voltage (1v/div) 3. heavy load (i out =200ma) v in =1.8v t (5 sec/div) output vol tag e (10mv/div) 0v 3v cont vol tag e (1v/div) discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 37 ? ?? ? transient responses 1. powering on due to v in (v in : 0v 1.8 v) s-8324a30 (light load:i out =1ma) t (1msec/div) 2v input vol. (1v/div) output v. (1v/div) 0v 3v 0v s-8324a30 (heavy load:i out =60ma) t (1msec/div) 2v input vol. (1v/div) output v. (1v/div) 0v 3v 0v s-8328b30 (light load:i out =1ma) t (1msec/div) 2v input vol. (1v/div) output v. (1v/div) 0v 3v 0v s-8328b30 (heavy load:i out =200ma) t (1msec/div) 2v input vol. (1v/div) output v. (1v/div) 0v 3v 0v 2. powering on due to shutdown pin (von/off: 0v 3.0 v) s-8324a30 (light load:i out =1ma) t (1m s ec/div) 3v input vol. (1v/div) output v. (1v/div) 0v 3v 0v v in =1.8v s-8324a30 (heavy load:i out =60ma) t (1msec/div) 3v input vol. (1v/div) output v. (1v/div) 0v 3v 0v v in =1.8v s-8328b30 (light load:i out =1ma) t (1m s ec/div) 3v input vol. (1v/div) output v. (1v/div) 0v 3v 0v v in =1.8v s-8328b30 (heavy load:i out =200ma) t (1msec/div) 3v input vol. (1v/div) output v. (1v/div) 0v 3v 0v v in =1.8v discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 38 seiko instruments inc. 3. load fluctuations s-8324a30 (i out :100 a 50ma) v in =1.8v t (100 sec/div) 3v output vol. (50mv/div) 100 a 50ma load current s-8324a30 (i out :50ma 100 a) v in =1.8v t (5msec/div) 3v output vol. (50mv/div) 100 a 50ma load current s-8328b30 (i out :100 a 100ma) v in =1.8v t (100 sec/div) 3v output vol. (50mv/div) 100 a 100ma load current s-8328b30 (i out :100ma 100 a) v in =1.8v t (5msec/div) 3v output vol. (50mv/div) 100 a 100ma load current there is no significant difference in load/power-voltage fluctuations between a, b, and h types. 4. power voltage fluctuations s8324a30 (v in :1.8v 2.4v) i out =50ma t (100 sec/div) 3v output vol. (25mv/div) input vol. (0.2v/div) 1.8v 2.4v s8324a30 (v in :2.4v 1.8v) i out =50ma t (100 sec/div) 3v output vol. (25mv/div) input vol. (0.2v/div) 1.8v 2.4v s8328b30 (v in :1.8v 2.4v) i out =100ma t (100 sec/div) 3v output vol. (25mv/div) input vol. (0.2v/div) 1.8v 2.4v s8328b30 (v in :2.4v 1.8v) i out =100ma t (100 sec/div) 3v output vol. (25mv/div) input vol. (0.2v/div) 1.8v 2.4v there is no significant difference in load/power-voltage fluctuations between a, b, and h types. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 39 ? ?? ? operation start voltage and operation holding voltage characteristics for output current (the characteristics measurement circuits are standard circuit(1) for s-8324a/h, standard circuit(2) for s-8328b, standard circuit(8) for s-8328h. the external parts are subject to the electrical properties of each a/b/h type.) s-8324a30 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input vol tag e v in (v) vst1 vh l d s-8324a50 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input voltage v in (v) vst1 vhld s-8328b30 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input vol tag e v in (v) vst1 vh l d s-8328b50 0.0 0.2 0.4 0.6 0.8 1.0 0246810 output current i out (ma) input vol tag e v in (v) vst1 vh l d 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0246810 s-8324h33 output current i out (ma) input voltage v in (v) vst1 vhld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 024681 0 s-8324h50 output current i out (ma) input voltage v in (v) vst1 vhld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 024681 0 s-8328h33 output current i out (ma) input voltage v in (v) vst1 vhld 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 024681 0 s-8328h50 output current i out (ma) input voltage v in (v) vst1 vhld discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 40 seiko instruments inc. ? ?? ? input voltage characteristics for input current (the characteristics measurement circuits are standard circuit(1) for s-8324a/h, standard circuit(2) for s-8328b, standard circuit(8) for s-8328h. the external parts are compatible with the specified conditions of electrical characteristics of types a, b and h, respectively. the input current adopted for the measuring condition is the consumption current from v in under no load.) 0 20 40 60 80 100 120 012345 vout=2v vout=3v vout=5v 0 10 20 30 40 50 vout=3v,rb=300 ? vout=3v,rb=1k ? vout=5v,rb=300 ? vout=5v,rb=1k ? s-8328b s-8324a input voltage v in (v) input current i in (ma) input current i in ( a) 012345 input voltage v in (v) 0 1 2 3 4 5 6 7 8 vout=3.3 v vout=5.0 v 123 45 s-8324h input voltage v in (v) input current i in (ma) 0 20 40 60 80 100 120 140 160 180 s-8328h input current i in ( a) vout=3.3 v vout=5.0 v 123 45 input voltage v in (v) discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 41 ? ?? ? reference data use reference data to choose the external parts. reference data give yor the procedure to choose the recommended external parts for various applications and its characteristics data. 1. classification of products and inductors by usage the products are classified in general into built-in/external switching transistor(s-8324/8) types and low/high switching frequency(a,b/h) types. compared with built-in switching transistors, external switching transistors can yield larger output current but their efficien cy decreases in a small output current range(especially less than 1ma). compared with low frequency models, the high frequency models can yield smaller external parts, in particular inductors, and smaller output ripple voltage. however, they need more than two alkaline-manganese battery cells(operation voltage increases from 0.9v to 1.4v). and the efficiency decreases in a small output current range(especially less than 1ma). the figures below summarize above features. please refer to those figures when choosing your models. output current s-8324h type (built-in switching transistor) 2v 3v 5v cdh113 d62f d62f s-8328h type (external switching transistor) 10ma 100ma 1a output voltage cdrh4d18 figure 36 classification of inductors by output current s-8328b type s-8324a type (built-in switching transistor) lqh3c 2v 3v 5v lqh4n cd54 cd105 cd54 (external switching transistor) 10ma 100ma 1a output voltage output current discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 42 seiko instruments inc. 2. procedure to choose the most suitable condition from reference data. please refer to the procedures shown below when choosing external parts based on the reference data. start choose the desired output voltage choose the condition for desired output current operation efficiency is more important rather than stand-by efficiency? *1 *2 *3 no yes choose the best condition for operation efficiency. stand-by efficiency is ok? *4 choose next best condition for operation efficiency choose the best condition for stand-by efficiency. operation efficienc y is ok? *4 *4 choose next best condition for operation ffi i no *4 *5 ripple voltage is ok? increase output current yes *5 no end yes *4 *4 *1) choose desired output voltage from conditions (1) to (17) shown in table 1 and 2. when desired output voltage does not exist in tables, choose the next higher voltage. for instance, when v out =3v for s-8324a, choose from conditions (3) to (6). *2) choose all conditions from conditions choosed avobe for output current needed for input voltage (min) of the operational condition from ?reference data 1 (a) output voltage characteristics for output current?. for instance, when 10ma output current is needed at v in =0.9v, choose from conditions (4) to (6). *3) stand-by efficiency means the efficiency when the output current is small (approx. 100 a), operation efficiency means the efficiency when the output current is large (several ma). for instance, go to ?yes? when operation efficiency is more important rather than stand-by efficiency. *4) read the efficiency for input voltage and output current in operational condition from ?reference data 1 (b) efficiency characteristics for output current?. for instance, when v in =0.9v at i out =10ma, the efficiency is max. (75%) in condition (6) in conditions (4) to (6). there is no difference between conditions (4) to (6) when the output current is 100 a at stand-by condition. therefore, choose condition (6). *5) read the ripple voltage under the operational condition selected above from ?reference data 2 ripple voltage characteristics for output current?. for instance, when condition (6) is selected above, the ripple voltage is 14mv at v in =0.9v and i out =10ma. no yes discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 43 3. reference data for external components table 1 s-8324 series condition product type v out model name of l l value d c out (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) a a a a a a a a a h h h h h h h h 2v 2v 3v 3v 3v 3v 5v 5v 5v 2.5v 2.5v 3.3v 3.3v 3.3v 5v 5v 5v lqh3c lqh4n lqh4n cd54 cd54 cd54 cd54 cd54 cd54 cdrh4d18 d62f cdrh4d18 d62f d62f cdrh4d18 d62f d62f 220 h 220 h 220 h 47 h 100 h 220 h 47 h 100 h 220 h 22 h 22 h 22 h 10 h 22 h 22 h 10 h 22 h ma720 22 f table 2 s-8328 series condition product type v out model name of l l value model name of external transistor rb cb d c out (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (29) b b b b b b b b h h h h 3v 3v 3v 3v 5v 5v 5v 5v 3.3v 3.3v 5v 5v cd105 cd105 cd54 d75c cd105 cd105 cd54 d75c d62f cdh113 d62f cdh113 22 h 22 h 47 h 47 h 22 h 22 h 47 h 47 h 6.8 h 10 h 6.8 h 10 h 2sd1628g tn0200t nds335h tn0200t nds335n 300 ? 1k ? 1k ? 1k ? 300 ? 1k ? 1k ? 1k ? ? ? ? ? 0.01 f 0.0022 f 0.0022 f 0.0022 f 0.01 f 0.0022 f 0.0022 f 0.0022 f ? ? ? ? ma735 ma735 ma720 ma720 ma735 ma735 ma720 ma720 ma720 ma735 ma720 ma735 47 f 2 47 f 2 47 f 47 f 47 f 2 47 f 2 47 f 47 f 100 f the properties of external parts are shown below. table 3 part product name manufacturer?s name l value dc resistance max allowable current diameter height cd105 sumida 22 f0.10 ? 1.95a 10.0mm 5.4mm cd54 47 f0.37 ? 0.72a 5.8mm 4.5mm 100 f0.70 ? 0.52a 220 f1.57 ? 0.35a cdrh4d18 22 h 0.397 ? 0.41a 4.5mm 2.0mm cdh113 10 h 0.054 ? 2.00a 11.0mm 3.7mm inductor lqh4n murata 220 f5.40 ? 0.11a 4.5mm 2.6mm lqh3c 220 f8.40 ? 0.07a 3.2mm 2.0mm d75c toko 47 f0.20 ? 0.76a 7.6mm 5.1mm 100 h0.40 ? 0.50a d62f 6.8 h 0.075 ? 1.36a 6.0mm 2.7mm 10 h 0.110 ? 1.20a 22 h 0.247 ? 0.70a diode ma720 matsushita forward current 500ma(at v f =0.55v) (schottky) ma735 forward current 1a(at v f =0.5v) output capacitor f93 nichicon surface mount tantlum electrolytic capacitor external transistor 2sd1628g sanyo bipolar npn transistor tn0200t temic siliconics mos fet nch transistor nds335n national semiconductor mos fet nch transistor discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 44 seiko instruments inc. the s-8324/28 series improves efficiency by switching pwm control to pfm control automatically when the output current is decreased. the reference data 1 shows the output current data switching pwm control to pfm control. 4. reference data 1 output voltage characteristics for output current and (b) efficiency characteristics for output current under conditions (1) to (29) shown in tables 1 and 2 are shown below. (1)s-8324a20(lqh3c:220 ? h) 1.95 1.97 1.99 2.01 2.03 2.05 output current i out (ma) output vol tag e v out (v) (a) output current - output voltage vin =0 .9v vin =1 .0v vin =1 .2v vin =1 .6v 0.01 0.1 1. 10. 100. 1000. 50 60 70 80 90 100 output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9v vin =1 .0v vin =1 .2v vin =1 .6v 0.01 0.1 1. 10. 100. 1000. 0.1 1. 10. pwm pfm output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 45 (2)s-8324a20(lqh4n:220 ? h) 1.95 1.97 1.99 2.01 2.03 2.05 output current i out (ma) output vol tag e v out (v) (a) output current - output voltage vin=0.9v vin=1.0v vin=1.2v vin=1.6v 0.01 0.1 1. 10. 1000. 100. 50 60 70 80 90 100 0.01 0.1 1. 10. 1000. 100. output current i out (ma) efficiency (%) (b) output current - efficiency vin=0.9v vin=1.0v vin=1.2v vin=1.6v pwm pfm 0.1 1. 10. output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 (3)s-8324a30(lqh4n:220 ? h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency 0.1 1. 10. output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 pwm pfm discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 46 seiko instruments inc. (4)s-8324a30(cd54:47 ? h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. output current i out (ma) output vol tag e v out (v) (a) output current - output voltage vin =0 .9v vin =1 .0v vin =1 .2v vin =1 .6v 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9v vin =1 .0v vin =1 .2v vin =1 .6v 0.1 1. 100. 10. output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 pwm pfm (5)s-8324a30(cd54:100 ? h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin =0 .9v vin =1 .2v vin =1 .8v vin =2 .4v output current i out (ma) output vol tag e v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9v vin =1 .2v vin =1 .8v vin =2 .4v 0.1 1. 10. output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 pwm pfm discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 47 (6)s-8324a30(cd54:220 ? h) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency 0.1 1. 10. output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 pfm pwm (7)s-8324a50(cd54:47 ? h) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 pwm pfm 0.1 1. 10. 100. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 48 seiko instruments inc. (8)s-8324a50(cd54:100 ? h) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.1 1. 10. 100. pwm pfm (9)s-8324a50(cd54:220 ? h) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 50 60 70 80 90 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) input vo l ta g e v in (v) (c) pwm/pfm switching pwm pfm 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.1 1. 10. 100. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 49 (10)s-8324h25(cdrh4d18:22 ? h) 2.45 2.47 2.49 2.51 2.53 2.55 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v 0.0 1.0 2.0 3.0 0.1 1 10 100 (11)s-8324h25(d62f:22 ? h ) 2.45 2.47 2.49 2.51 2.53 2.55 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v 0.0 1.0 2.0 3.0 0.1 1 10 100 ? vin=1.5v output current i out (ma) output voltage v out (v) (a) output current - output voltage output current i out (ma) input voltage v in (v) pwm pfm (c) pwm/pfm switching output current i out (ma) input voltage v in (v) pwm pfm (c) pwm/pfm switching output voltage v out (v) (a) output current - output voltage output current i out (ma) vin=1.5v discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 50 seiko instruments inc. (12)s-8324h33(cdrh4d18:22 ? h) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v vin=1.8v vin=3.0v 0.0 1.0 2.0 3.0 4.0 0.1 1 10 100 (13)s-8323h33(d62f:10 ? h ) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 vin=1.5v vin=1.8v vin=3.0v output current i out (ma) efficiency (%) (b) output current - efficiency 0.0 1.0 2.0 3.0 4.0 0.1 1 10 100 output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.5v vin=1.8v vin=3.0v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 51 (14)s-8324h33(d62f:22 ? h) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 vin=1.5v vin=1.8v vin=3.0v output current i out (ma) efficiency (%) (b) output current - efficiency 0.0 1.0 2.0 3.0 0 . 111 01 0 0 (15)s-8324h50(cdrh 4d18:22 ? h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.8v vin=3.0v vin=4.5v 0.0 1.0 2.0 3.0 4.0 5.0 0.1 1 10 100 output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pwm pfm output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=4.5v vin=1.8v vin=3.0v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=1.8v vin=3.0v vin=1.5v discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 52 seiko instruments inc. (16)s-8324h50(d62f:10 ? h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 vin=1.8v vin=3.0v vin=4.5v 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency 0.0 1.0 2.0 3.0 4.0 5.0 0.1 1 10 100 1000 (17)s-8324h50(d62f:22 ? h) 4.95 4.98 5.01 5.04 5.07 5.1 0.01 0.1 1 10 100 1000 output current i out (ma) output vol tag e v out (v) (a) output current - output voltage vin=3.0v vin=4.5v vin=1.8v vin=1.8v vin=3.0v vin=4.5v 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency output current i out (ma) input vo l ta g e v in (v) (c) pwm/pfm switching 0.0 1.0 2.0 3.0 4.0 5.0 0.1 1 10 100 pfm pwm output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=3.0v vin=4.5v vin=1.8v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 53 (18)s-8328b30(cd105:22 ? h,rb=300 ? ?? ? ,cb=0.01 ? f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9v vin =1 .2v vin =1 .8v vin =2 .4v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.1 1. 10. 100. pfm pwm (19)s-8328b30(cd105:22 ? h,rb=1k ? ?? ? ,cb=0.0022 ? f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9v vin =1 .2v vin =1 .8v vin =2 .4v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.1 1. 10. 100. pfm pwm discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 54 seiko instruments inc. (20)s-8328b30(cd54:47 ? h,rb=1k ? ?? ? ,cb=0.0022 ? f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) efficiency (%) (b) output current - efficiency output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.1 1. 10. 100. pfm pwm (21)s-8328b30(d75c:47 ? h,rb=1k ? ?? ? ,cb=0.0022 ? f) 2.95 2.97 2.99 3.01 3.03 3.05 0.01 0.1 1. 10. 100. 1000. vin=0.9v vin=1.2v vin=1.8v vin=2.4v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. output current i out (ma) efficiency (%) (b) output current - efficiency vin =0 .9v vin =1 .2v vin =1 .8v vin =2 .4v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.1 1. 10. 100. pfm pwm discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 55 (22)s-8328b50(cd105:22 ? h,rb=300 ? ?? ? ,cb=0.01 ? f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency output current i out (ma) input vo l ta ge v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 pwm pfm 0.1 1. 10. 100. (23)s-8328b50(cd105:22 ? h,rb=1k ? ?? ? ,cb=0.0022 ? f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 pwm pfm 0.1 1. 10. 100. discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 56 seiko instruments inc. (24)s-8328b50(cd54:47 ? h,rb=1k ? ?? ? ,cb=0.0022 ? f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 pwm pfm 0.1 1. 10. 100. (25)s-8328b50(d75c:47 ? h,rb=1k ? ?? ? ,cb=0.0022 ? f) 4.90 4.94 4.98 5.02 5.06 5.10 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1. 10. 100. 1000. 10000. vin=0.9v vin=1.8v vin=3.0v vin=4.0v output current i out (ma) efficiency (%) (b) output current - efficiency output current i out (ma) input voltage v in (v) (c) pwm/pfm switching 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 pwm pfm 0.1 1. 10. 100. discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 57 (26)s-8328h33(d62f:6.8 ? h) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v vin=1.8v vin=3.0v 0.0 1.0 2.0 3.0 0.1 1 10 100 (27)s-8328h33(cdh113:10 ? h ) 3.25 3.27 3.29 3.31 3.33 3.35 0.01 0.1 1 10 100 1000 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=1.5v vin=1.8v vin=3.0v 0.0 1.0 2.0 3.0 0.1 1 10 100 output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm vin=1.8v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=3.0v vin=1.5v vin=1.8v output current i out (ma) output voltage v out (v) (a) output current - output voltage vin=3.0v vin=1.5v output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 58 seiko instruments inc. (28)s-8328h50(d62f:6.8 ? h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 vin=4.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=4.5v vin=1.8v vin=3.0v 0.0 1.0 2.0 3.0 4.0 5.0 0.1 1 10 100 1000 (29)s-8328h50(cdh113:10 ? h) 4.9 4.94 4.98 5.02 5.06 5.1 0.01 0.1 1 10 100 1000 vin=4.5v vin=1.8v vin=3.0v output current i out (ma) output voltage v out (v) (a) output current - output voltage 0 20 40 60 80 100 0.01 0.1 1 10 100 1000 output current i out (ma) efficiency (%) (b) output current - efficiency vin=4.5v vin=1.8v vin=3.0v output current i out (ma) input voltage v in (v) (c) pw m/pfm switching 0.0 1.0 2.0 3.0 4.0 0.1 1 10 100 pfm pwm output current i out (ma) input voltage v in (v) (c) pwm/pfm switching pfm pwm discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 59 5. reference data 2 the ripple voltage characteristics data is shown below: (1)s-8324a20 (2)s-8324a20 (lqh3c:220 ? h,c out :22 ? f ) (lqh4n:220 ? h,c out :22 ? f ) similar to (2) 0 20 40 60 80 100 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage vr (mv) vin=0.9v vin=1.2v vin=1.6v (3)s-8324a30 (lqh4n:220 ? h,c out :22 ? f ) similar to (6) (4)s-8324a30 (7)s-8324a50 (cd54:47 ? h,c out :22 ? f ) (cd54:47 ? h,c out :22 ? f ) vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 120 180 160 140 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage vr (mv) ripple voltage vr (mv) 0 20 40 60 80 100 0.1 1. 10. 100. 1000. output current i out (ma) vin=0.9v vin=3.0v vin=4.0v (5)s-8324a30 (8)s-8324a50 (cd54:100 ? h,c out :22 ? f ) (cd54:100 ? h,c out :22 ? f ) 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage vr (m v) ripple voltage vr (m v) 0.1 1. 10. 100. 1000. output current i out (ma) 0 20 40 60 80 100 vin=0.9v vin=3.0v vin=4.0v vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 discontinued product
small package pwm/pfm control step-up switching regulator s-8324/8328 series rev. 7.2 _10 60 seiko instruments inc. (6)s-8324a30 (9)s-8324a50 (cd54:220 ? h,c out :22 ? f ) (cd54:220 ? h,c out :22 ? f ) 0.1 1. 10. 100. 1000. output current i out (ma) ripple voltage vr (m v) ripple voltage vr (m v) 0.1 1. 10. 100. 1000. output current i out (ma) 0 20 40 60 80 100 vin=0.9v vin=3.0v vin=4.0v vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 (11)s-8324h25 (14)s-8324h33 (d62f:22 ? h,c out :22 ? f ) (d62f:22 ? h,c out :22 ? f ) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) v=1.5v v=1.8v v=3.0v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) v=1.2v v=1.5v (17)s-8324h50 (d62f:22 ? h,c out :22 ? f ) 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) 0 20 40 60 80 100 v=4.5v v=3.0v v=1.8v discontinued product
small package pwm/pfm control step-up switching regulator rev. 7.2 -10 s-8324/8328 series seiko instruments inc. 61 (18)(11)s-8328b30 (22)(23)s-8328b50 (cd105:22 ? h,c out :47 ? f 2 ) (cd105:22 ? h,c out :47 ? f 2 ) vin=0.9v vin=3.0v vin=4.0v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) (20)s-8328b30 (24)s-8328b50 (cd54:47 ? h,c out :47 ? f) (cd54:47 ? h,c out :47 ? f ) vin=0.9v vin=3.0v vin=4.0v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) vin=0.9v vin=1.8v vin=2.4v 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) ripple voltage vr (mv) (21)s-8328b30 (25)s-8328b50 (d75c:47 ? h,c out :47 ? f) (d75c:47 ? h,c out :47 ? f) similar to (12) similar to (16) (27)s-8328h33 (29)s-8328h50 (cdh113:10 ? h,c out :100 ? f) (cdh113:10 ? h,c out :100 ? f) v=3.0v v=1.8v v=1.5v output current i out (ma) ripple voltage vr (mv) 0 20 40 60 80 100 0.1 1 10 100 1000 v=4.5v v=3.0v v=1.8v output current i out (ma) ripple voltage vr (mv) 0 20 40 60 80 100 0.1 1 10 100 1000 discontinued product

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2.90.2 0.950.1 1.90.2 +0.1 -0.05 0.16 0.40.1 0.25 +0.2 -0.6 2.8 0~ 0.1 1 2 3 1.5 1.3max. 1.10.1 t2 1.60.1 0.250.05 4.00.1 2.00.1 4.00.1 1.5 +0.1 -0.05 1.10.1 2.850.2 feed direction 1.750.1 3.50.1 8.00.2 3.050.2 no.:mp003-a-c-sd-1.0 210.5 20.2 (60) (60) ?130.2 12.5max. 9.00.3 winding core ?60 +1 -0 ?180 +0 -3 n sot-23-3 mp003-a 990531 no.:mp003-a-p-sd-1.0 no.:mp003-a-r-sd-1.0 unit:mm l dimensions l taping specifications l reel specifications 1 reel holds 3000 ics. discontinued product

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the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. discontinued product

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