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rev.2.4 _00 step-up, built-in / external fet pfm control switching regulator / switching regulator controller s-8351/8352 series seiko instruments inc. 1 the s-8351/8352 series is a cmos step- up switching regulator controller which mainly consists of a referenc e voltage source, an oscillation circuit, a comparator and pfm control circuit. the pfm control circuit allows the duty ratio to be automatically switched according to the load (at light load : 50%, at high output current : 75%), enabling products with a low ripple over a wide range, high efficiency, and high output current (a, b, and d type). products with a fixed duty ratio of 75% are also available (c type). the s-8351 series can configure a st ep-up switching regulator with an external coil, capacitor, and diode. a protection circuit turns off the built- in mos fet when the voltage at the cont pin exceeds the limit to prevent it from being damaged. in addition to the above features, the small package and low current consum ption, makes the s-8351 series ideal for applications such as the power supply unit of portable equipment. the s-8352 series, which features an ex ternal transistor, is suitable for applications requiring a high output current. ? features ? low voltage operation : st artup at 0.9 v min. (i out = 1 ma) guaranteed ? low current consumpti on : during operation 23.2 a (v out = 3.3 v, typ.) during shutdown 0.5 a (max.) ? duty ratio : 50 % / 75 % built-in auto-switchi ng-type pfm control circuit (a, b, and d type) 75 % built-in fixed-type pfm control circuit (c type) ? external parts : coil, capacitor, and diode ? output voltage : selectable in 0.1 v steps between 2.0 v to 6.5 v (a, b, and c type) selectable in 0.1 v steps betw een 1.5 v to 6.5 v (d type) ? output voltage accuracy : 2.4% ? shutdown function (a type) ? v dd / v out separate type (d type) ? external transistor type available (s-8352 series) ? lead-free products ? applications ? power supplies for portable equipment such as digital cameras, electronic notebooks, and pdas ? power supplies for audio equipment such as portable cd / md players ? constant voltage power supplies for camera s, video equipment, and communications equipment ? power supplies for microcomputers ? packages drawing code package name package tape reel sot-23-3 mp003-a mp003-a mp003-a sot-23-5 mp005-a mp005-a mp005-a sot-89-3 up003-a up003-a up003-a
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 2 ? block diagrams 1. s-8351 series (1) a type (with shutdown function) vss ic internal power supply vout cont protection circuit pfm control circuit v ref off / on + ? figure 1 (2) b and c types (without shutdown function, v dd / v out non-separate type) vss vout cont protection circuit pfm control circuit v ref ic internal power supply + ? figure 2 (3) d type (v dd / v out separate type) ic internal power supply vss vout cont protection circuit pfm control circuit v ref + ? vdd figure 3
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 3 2. s-8352 series (1) a type (with shutdown function) ext ic internal power supply vss vout pfm control circuit v ref off / on + ? figure 4 (2) b and c type (without shutdown function, v dd / v out non-separate type) ic internal power supply pfm control circuit v ref ext vout vss + ? figure 5 (3) d type (v dd / v out separate type) ic internal power supply ext vdd vss vout pfm control circuit v ref + ? figure 6
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 4 ? product name structure the product types, output voltage, and pa ckages for the s-8351/8352 series can be selected at the user?s request. please refer to the ? 3. product name ? for the definition of the product name and ? 4. product name list ? for the full product names. 1. function list (1) built-in power mos fet type table 1 product name controll system duty ratio [%] switching frequency [khz] shutdown function v dd / v out separate type package application s-8351axxmc pfm 50 / 75 100 yes ? sot-23-5 applications requiring shutdown function s-8351bxxma pfm 50 / 75 100 ? ? sot-23-3 applications not requiring shutdown function s-8351cxxma pfm 75 100 ? ? sot-23-3 applications not requiring shutdown function s-8351cxxua pfm 75 100 ? ? sot-89-3 applications not requiring shutdown function s-8351dxxmc pfm 50 / 75 100 ? yes sot-23-5 applications in which output voltage is adjusted by external resistor (2) external power mos fet type table 2 product name controll system duty ratio [%] switching frequency [khz] shutdown function v dd / v out separate type package application s-8352axxmc pfm 50 / 75 100 yes ? sot-23-5 applications requiring shutdown function s-8352bxxma pfm 50 / 75 100 ? ? sot-23-3 applications not requiring shutdown function s-8352cxxma pfm 75 100 ? ? sot-23-3 applications not requiring shutdown function s-8352cxxua pfm 75 100 ? ? sot-89-3 applications not requiring shutdown function s-8352dxxmc pfm 50 / 75 100 ? yes sot-23-5 applications in which output voltage is adjusted by external resistor
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 5 2. package and function list by product type table 3 series name type package name (abbreviation) shutdown function yes / no v dd / v out separate type yes / no a (duty ratio 50% / 75% auto-switching type) a = 100 khz mc yes no b (duty ratio 50% / 75% auto-switching type) b = 100 khz ma no no c (duty ratio 75% fixed type) c = 100 khz ma / ua no no s-8351 series, s-8352 series d (duty ratio 50% / 75% auto-switching type) d = 100 khz mc no yes 3. product name s-835 x x xx xx - xxx t2 g ic direction in tape specifications *1 product code *2 package code ma : sot-23-3 mc : sot-23-5 ua : sot-89-3 output voltage 15 to 65 (e.g. when the output voltage is 1.5 v, it is expressed as 15.) product type a : with shutdown function, f osc = 100 khz b : 50% / 75% automatic duty ratio switching type, f osc = 100 khz c : 75% duty ratio fixed type, f osc = 100 khz d : v dd / v out separate type, f osc = 100 khz series name 1 : built-in power mos fet 2 : external p ower mos fet *1. refer to the tape specifications. *2. refer to the table 4, 5 in the ? 4. product name list ?.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 6 4. product name list (1) s-8351 series table 4 output voltage s-8351axxmc series s-8351bxxma series s-8351cxxma series s-8351cxxua series s-8351dxxmc series 1.5 v ? ? ? ? s-8351d15mc-j8at2g 2.0 v s-8351a20mc-j2ft2g s-8351b20ma-j4ft2g ? ? s-8351d20mc-j8ft2g 2.2 v s-8351a22mc-j2ht2g ? ? ? ? 2.5 v s-8351a25mc-j2kt2g s-8351b25ma-j4kt2g ? s-8351c25ua-j6kt2g ? 2.7 v s-8351a27mc-j2mt2g s-8351b27ma-j4mt2g ? ? ? 2.8 v s-8351a28mc-j2nt2g ? ? ? ? 3.0 v s-8351a30mc-j2pt2g s-8351b30ma-j4pt2g ? s-8351c30ua-j6pt2g s-8351d30mc-j8pt2g 3.2 v ? ? ? s-8351c32ua-j6rt2g ? 3.3 v s-8351a33mc-j2st2g s-8351b33ma-j4st 2g s-8351c33ma-j6st2g s-8351c33ua-j6st2g ? 3.5 v s-8351a35mc-j2ut2g ? ? s-8351c35ua-j6ut2g ? 4.0 v s-8351a40mc-j2zt2g ? ? ? s-8351d40mc-j8zt2g 4.5 v s-8351a45mc-j3et2g s-8351b45ma-j5et2g ? ? ? 4.6 v ? s-8351b46ma-j5ft2g ? ? ? 4.7 v s-8351a47mc-j3gt2g ? ? ? ? 5.0 v s-8351a50mc-j3jt2g s-8351b50ma-j5jt2g ? s-8351c50ua-j7jt2g s-8351d50mc-j9jt2g 5.5 v s-8351a55mc-j3ot2g S-8351B55MA-J5OT2G ? ? ? 5.6 v s-8351a56mc-j3pt2g ? ? ? ? 6.0 v s-8351a60mc-j3tt2g ? ? ? ? remark please contact the sii marketing department for products with an output voltage other than those spec ified above. (2) s-8352 series table 5 output voltage s-8352axxmc series s-8352bxxma series s-8352cxxua series s-8352dxxmc series 2.0 v ? ? ? s-8352d20mc-k8ft2g 2.5 v s-8352a25mc-k2kt2g ? ? ? 3.0 v s-8352a30mc-k2pt2g s-8352b30ma-k4pt2g s-8352c30ua-k6pt2g s-8352d30mc-k8pt2g 3.1 v ? ? s-8352c31ua-k6qt2g ? 3.2 v s-8352a32mc-k2rt2g ? s-8352c32ua-k6rt2g ? 3.3 v s-8352a33mc-k2st2g ? s-8352c33ua-k6st2g s-8352d33mc-k8st2g 3.5 v s-8352a35mc-k2ut2g ? ? ? 3.7 v s-8352a37mc-k2wt2g ? ? ? 4.0 v s-8352a40mc-k2zt2g ? ? ? 4.6 v s-8352a46mc-k3ft2g ? ? ? 4.7 v s-8352a47mc-k3gt2g ? ? ? 5.0 v s-8352a50mc-k3jt2g s-8352b50ma-k5jt2g s-8352c50ua-k7jt2g ? 5.4 v s-8352a54mc-k3nt2g ? ? ? 5.6 v ? ? s-8352c56ua-k7pt2g ? remark please contact the sii marketing department for products with an output voltage other than those spec ified above.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 7 ? pin configurations table 6 s-8351 series b and c types (without shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 vout output voltage pin and ic power supply pin 2 vss gnd pin 3 cont external inductor connection pin (open-drain output) table 7 s-8352 series b and c types (without shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 vout output voltage pin and ic power supply pin 2 vss gnd pin 1 2 3 sot-23-3 top view figure 7 3 ext external transistor connection pin (cmos output) table 8 s-8351 series a type (with shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 off / on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (ent ire circuit stopped) 2 vout output voltage pin and ic power supply pin 3 nc *1 no connection 4 vss gnd pin sot-23-5 top view 5 4 3 2 1 5 cont external inductor connection pin (open-drain output) figure 8 *1. the nc pin indicates electrically open. table 9 s-8352 series a type (with shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 off / on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (ent ire circuit stopped) 2 vout output voltage pin and ic power supply pin 3 nc *1 no connection 4 vss gnd pin 5 ext external transistor connection pin (cmos output) *1. the nc pin indicates electrically open.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 8 table 10 s-8351 series d type (without shutdown function, v dd / v out separate type) pin no. symbol pin description 1 vout output voltage pin 2 vdd ic power supply pin 3 nc *1 no connection 4 vss gnd pin 5 cont external inductor connection pin (open-drain output) *1. the nc pin indicates electrically open. table 11 s-8352 series d type (without shutdown function, v dd / v out separate type) pin no. symbol pin description 1 vout output voltage pin 2 vdd ic power supply pin 3 nc *1 no connection 4 vss gnd pin 5 ext external transistor connection pin (cmos output) *1. the nc pin indicates electrically open. table 12 s-8351 series c type (without shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 vss gnd pin 2 vout output voltage pin and ic power supply pin 3 cont external inductor connection pin (open-drain output) sot-89-3 top view 3 2 1 figure 9 table 13 s-8352 series c type (without shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 vss gnd pin 2 vout output voltage pin and ic power supply pin 3 ext external transistor connection pin (cmos output)
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 9 ? absolute maximum ratings table 14 (ta = 25 c unless otherwise specified) item symbol absolute maximum rating unit vout pin voltage v out v ss ? 0.3 to v ss + 12 v off / on pin voltage *1 off / on v v ss ? 0.3 to v ss + 12 v vdd pin voltage *2 v dd v ss ? 0.3 to v ss + 12 v cont pin voltage v cont v ss ? 0.3 to v ss + 12 v d type v ss ? 0.3 to v dd + 0.3 v ext pin voltage others v ext v ss ? 0.3 to v out + 0.3 v cont pin current i cont 300 ma ext pin current i ext 50 ma 150 (when not mounted on board) mw sot-23-3 430 *3 mw 250 (when not mounted on board) mw sot-23-5 600 *3 mw 500 (when not mounted on board) mw power dissipation sot-89-3 p d 1000 *3 mw operating ambient temperature t opr ? 40 to + 85 c storage temperature t stg ? 40 to + 125 c *1. with shutdown function *2. for v dd / v out separate type *3. when mounted on board [mounted board] (1) board size : 114.3 mm 76.2 mm t1.6 mm (2) board name : jedec standard51-7 caution the absolute maximum ra tings are rated values exceeding whic h the product could suffer physical damage. these values must therefor e not be exceeded under any conditions. (1) when mounted on board (2) when not mounted on board 0 50 100 150 800 400 0 power dissipation (p d ) [mw] ambient temperature (ta) [ c] 1000 600 200 1200 sot-23-3 sot-23-5 sot-89-3 0 50 100 150 400 200 0 power dissipation (p d ) [mw] ambient temperature (ta) [ c] 500 300 100 600 sot-23-3 sot-23-5 sot-89-3 figure 10 power dissipation of packages
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 10 ? electrical characteristics (1) s-8351 series table 15 (1 / 2) (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 1 input voltage v in ? ? ? 10 v 1 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 1 oscillation start voltage v st2 no external parts, voltage applied to v out , cont pin pulled up to v out with 300 ? resistor ? ? 0.8 v 2 s-8351x15 to 29 ? 8.5 ? a 1 s-8351x30 to 49 ? 9.0 ? a 1 input current during no- load i in i out = 0 ma s-8351x50 to 65 ? 9.5 ? a 1 s-8351x15 to 19 ? 9.6 16.0 a 2 s-8351x20 to 29 ? 15.7 26.2 a 2 s-8351x30 to 39 ? 23.2 38.6 a 2 s-8351x40 to 49 ? 32.0 53.3 a 2 s-8351x50 to 59 ? 42.1 70.2 a 2 current consumption 1 i ss1 v out = v out(s) 0.95 s-8351x60 to 65 ? 54.9 91.5 a 2 s-8351x15 to 19 ? 2.3 3.5 a 2 s-8351x20 to 29 ? 2.5 3.8 a 2 s-8351x30 to 39 ? 2.7 4.1 a 2 s-8351x40 to 49 ? 2.9 4.4 a 2 s-8351x50 to 59 ? 3.1 4.7 a 2 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-8351x60 to 65 ? 3.3 5.1 a 2 current consumption during shutdown (with shutdown function) i sss off / on v = 0 v ? ? 0.5 a 2 s-8351x15 to 19 50.2 91.2 ? ma 2 s-8351x20 to 24 65.0 118.2 ? ma 2 s-8351x25 to 29 78.5 142.7 ? ma 2 s-8351x30 to 39 90.7 164.8 ? ma 2 s-8351x40 to 49 110.9 201.6 ? ma 2 s-8351x50 to 59 125.7 228.6 ? ma 2 switching current i sw v cont = 0.4 v s-8351x60 to 65 135.2 245.8 ? ma 2 switching transistor leakage current i swq no external parts, v cont = v out = 10 v, off / on v = 0 v ? ? 0.5 a 2 cont pin limit voltage v contlmt apply to cont pin, confirm oscillation stop ? 0.9 ? v 2 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 1 load regulation ? v out2 i out = 10 a to v out(s) / 250 1.25 ? 30 60 mv 1 output voltage temperature coefficient out out v ta ? v ? ? ta = ? 40 c to + 85 c ? 50 ? ppm / c 1 oscillation frequency f osc v out = v out(s) 0.95, measured waveform at cont pin 90 100 110 khz 2 duty ratio 1 duty1 v out = v out(s) 0.95, measured waveform at cont pin 70 75 80 % 2 duty ratio 2 (for a, b, d type) duty2 measured waveform at cont pin at light load ? 50 ? % 1
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 11 table 15 (2 / 2) (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit v sh v out = v out(s) 0.95, measured oscillation at cont pin 0.75 ? ? v 2 v sl1 at v out 1.5 v ? ? 0.3 v 2 off / on pin input voltage (with shutdown function) v sl2 v out = v out(s) 0.95, judged oscillation stop at cont pin at v out < 1.5 v ? ? 0.2 v 2 i sh off / on v = 10 v ? 0.1 ? 0.1 a 2 off / on pin input current (with shutdown function) i sl off / on v = 0 v ? 0.1 ? 0.1 a 2 s-8351x30 ? 86 ? % 1 efficiency effi ? s-8351x50 ? 88 ? % 1 external parts coil: cdrh6d28-101 (100 h) of sumida corporation diode: ma2z748 (shottky type) of matsus hita electric industrial co., ltd. capacitor: f93 (16 v, 47 f tantalum type) of nichicon corporation v in = v out(s) 0.6 applied, i out = v out(s) / 250 ? with shutdown function : off / on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd <10 v ? is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 12 (2) s-8352 series table 16 (1 / 2) (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 3 input voltage v in ? ? ? 10 v 3 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 3 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 4 s-8352x15 to 19 ? 7.4 12.3 a 4 s-8352x20 to 29 ? 12.0 20.0 a 4 s-8352x30 to 39 ? 17.8 29.6 a 4 s-8352x40 to 49 ? 24.7 41.1 a 4 s-8352x50 to 59 ? 32.7 54.5 a 4 current consumption 1 i ss1 v out = v out(s) 0.95 s-8352x60 to 65 ? 43.0 71.6 a 4 s-8352x15 to 19 ? 2.3 3.5 a 4 s-8352x20 to 29 ? 2.5 3.8 a 4 s-8352x30 to 39 ? 2.7 4.1 a 4 s-8352x40 to 49 ? 2.9 4.4 a 4 s-8352x50 to 59 ? 3.1 4.7 a 4 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-8352x60 to 65 ? 3.3 5.1 a 4 current consumption during shutdown (with shutdown function) i sss off / on v = 0 v ? ? 0.5 a 4 s-8352x15 to 19 ? 3.5 ? 6.3 ? ma 4 s-8352x20 to 24 ? 5.2 ? 9.4 ? ma 4 s-8352x25 to 29 ? 6.8 ? 12.3 ? ma 4 s-8352x30 to 39 ? 8.2 ? 14.9 ? ma 4 s-8352x40 to 49 ? 10.7 ? 19.4 ? ma 4 s-8352x50 to 59 ? 12.5 ? 22.8 ? ma 4 i exth v ext = v out ? 0.4 v s-8352x60 to 65 ? 13.9 ? 25.2 ? ma 4 s-8352x15 to 19 3.8 6.9 ? ma 4 s-8352x20 to 24 5.6 10.2 ? ma 4 s-8352x25 to 29 7.3 13.3 ? ma 4 s-8352x30 to 39 8.9 16.2 ? ma 4 s-8352x40 to 49 11.6 21.1 ? ma 4 s-8352x50 to 59 13.7 25.0 ? ma 4 ext pin output current i extl v ext = ? 0.4 v s-8352x60 to 65 15.3 27.8 ? ma 4 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 3 load regulation ? v out2 i out = 10 a to v out(s) / 100 1.25 ? 30 60 mv 3 output voltage temperature coefficient out out v ta ? v ? ? ta = ? 40 c to + 85 c ? 50 ? ppm / c 3 oscillation frequency f osc v out = v out(s) 0.95, measured waveform at ext pin 90 100 110 khz 4 duty ratio 1 duty1 v out = v out(s) 0.95, measured waveform at ext 70 75 80 % 4 duty ratio 2 (for a, b, d type) duty2 measured waveform at ext pin at light load ? 50 ? % 3
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 13 table 16 (2 / 2) (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit v sh v out = v out(s) 0.95, measured oscillation at ext 0.75 ? ? v 4 v sl1 at v out 1.5 v ? ? 0.3 v 4 off / on pin input voltage (with shutdown function) v sl2 v out = v out(s) 0.95, judged oscillation stop at ext pin at v out < 1.5 v ? ? 0.2 v 4 i sh off / on v = 10 v ? 0.1 ? 0.1 a 4 off / on pin input current (with shutdown function) i sl off / on v = 0 v ? 0.1 ? 0.1 a 4 s-8352x30 ? 83 ? % 3 efficiency effi ? s-8352x50 ? 85 ? % 3 external parts coil: cdrh6d28-101 (100 h) from sumida corporation diode: ma2z748 (shottky type) from matsus hita electric industrial co., ltd. capacitor: f93 (16 v, 47 f tantalum type) from nichicon corporation transistor: cph3210 from sanyo electric co., ltd. base resistor (rb): 1 k ? base capacitor (cb): 2200 ph (ceramic type) v in = v out(s) 0.6 applied, i out = v out(s) / 100 ? with shutdown function : off / on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd <10 v ? is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 14 ? measurement circuits 1. + ? v vss cont vout vdd *1 off / on *2 + ? figure 11 2. 300 ? oscilloscope a vss vout cont vdd *1 off / on *2 + ? figure 12 3. v c d r b vss ext vout vdd *1 + ? + ? off / on *2 figure 13 4. oscilooscope a vss ext vout vdd *1 off / on *2 + ? figure 14 *1. for v dd / v out separate type *2. with shutdown function
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 15 ? operation 1. step-up dc-dc converter the s-8351/8352 series is a dc-dc conver ter that uses a pulse frequency modulation method (pfm) and features low current consumption. this series is an especia lly efficient dc-dc converter at an output current of 100 a or lower. in conventional fixed-duty pfm dc-dc converters, although a low duty ratio allows a lower ripple voltage when the current load is light, the efficiency is decreased when the output load current is large. conversely, a high duty ratio increases the output load current and efficiency, but increas es the ripple voltage when the output load current is low. in the a, b, and d types, the duty ratio is automatically switched 75% when the output load current is high to secure the load drive capability and 50% when the output load current is low to control the load drive capability to decrease pulse skipping. this suppresses a drop in the ripple frequency, enabling control of the increase in the ripple voltage. the c type adopts a 75% fixed-duty pfm method. the ripple voltage increases more than that of the duty switching type with the load is low, but the efficiency is better. in the a, b, and d types, the duty ratio is not rapidly c hanged, but rather smoothly switched in the intermediate area between 50% and 75%. therefore, fluctuation of the ri pple voltage caused by duty switching is minimized. figures 15, 16 show the ripple voltage characteristics versus the output current. s-8351a30mc ta = 25 c s-8351a50mc ta = 25 c 0 10 20 30 40 50 60 70 80 90 100 0 20 40 60 80 100 i out [ma] v r p - p [mv] v in = 1.5 v v in = 2 v 0 20 40 60 80 100 120 140 0 20 40 60 80 100 120 140 160 180 i out [ma] v r p - p [mv] v in = 2 v v in = 3 v figure 15 output current (i out ) vs. ripple voltage (v rp-p ) characteristics figure 16 output current (i out ) vs. ripple voltage (v rp-p ) characteristics these figures show that the ripple volt age decreases as the output load current (i out ) changes from large to small. the ripple voltage becomes particularly small when i out is in the coil current discontinuous region of 20 ma or less.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 16 2. off on/ pin (shutdown pin) (a type) off / on pin stops or starts step-up operation. setting the off / on pin to the ?l? level stops operation of all the internal circuits and reduces the current consumption significantly. do not use the off / on pin in a floating state because it has the structure shown in figure 17 and is not pulled up or pulled down internally. do not apply a voltage of between 0.3 v and 0.75 v to the off / on pin because applying such a voltage increases the current consumption. if the shutdown pin is not used, connect it to the vout pin. the off / on pin does not have hysteresis. table 17 off / on pin cr oscillation circuit output voltage ?h? operation fixed ?l? stop ? v in *1 *1. voltage obtained by subtracting the voltage drop due to the dc resistance of the inductor and the diode forward voltage from v in . vss vout off / on figure 17 off on/ pin structure
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 17 3. operation the following are the basic equations [(1) through (7)] of the step-up switching regulator. (refer to figure 18 .) + ? + ? osc c l cont m1 vin l di off / on vout figure 18 step-up switching regulator circuit for basic equation voltage at cont pin at the moment m1 is turned on (v a ) *1 : v a = v s *2 (1) *1. current flowing through l (i l ) is zero. *2. non-saturated voltage of m1. the change in i l over time : l v v l v dt di s in l l ? = = (2) integration of equation (2) (i l ) : t l v v i s in l ? ? ? ? ? ? ? ? = (3) i l flows while m1 is on (t on ). the time of t on is determined by the os cillation frequency of osc. the peak current (i pk ) after t on : on s in pk t l v v i ? ? ? ? ? ? ? ? = (4) the energy stored in l is represented by 1/2 ? l (i pk ) 2 . when m1 is turned off (t off ), the energy stored in l is emitted th rough a diode to the output capacitor. then, the reverse voltage (v l ) is generated : v l = (v out + v d *1 ) ? v in (5) *1. diode forward voltage the voltage at cont pin rises only by v out + v d . the change in the current (i l ) flowing through the diode into v out during t off : l v v v l v dt di in d out l l ? + = = (6)
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 18 integration of the equation (6) is as follows : t l v v v i i in d out pk l ? ? ? ? ? ? ? ? + ? = (7) during t on , the energy is stored in l and is not transmitted to v out . when receiving the output current (i out ) from v out , the energy of the capacitor (c l ) is consumed. as a result, the pin voltage of c l 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 l , and the voltage of c l rises rapidly. v out is a time function, and therefore indicates the maximum value (ripple voltage (v p ? p ) ) when the current flowing through into v out and load current (i out ) match. next, the ripple voltage is determined 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 : 1 in d out pk out t l v v v i i ? ? ? ? ? ? ? ? + ? = (8) ? ? ? ? ? ? ? ? ? + ? ? = in d out out pk 1 v v v l ) i i ( t (9) when m1 is turned off (t off ), i l = 0 (when the energy of the inductor is completely transmitted). based on equation (7) : pk off in d out i t v v v l = ? ? ? ? ? ? ? ? ? + (10) when substituting equation (10) for equation (9) : off pk out off 1 t i i t t ? ? ? ? ? ? ? ? ? ? = (11) electric charge ? q 1 which is charged in c l during t 1 : 2 1 in d out 1 pk 1 t 0 in d out 1 t 0 pk l 1 t 0 1 t 2 1 l v v v t i tdt l v v v dt i dt i q ? ? + ? ? = ? ? + ? ? = = ? (12) when substituting equation (12) for equation (9) : () 1 out pk 1 out pk pk t 2 i i t i i 2 1 i 1 q ? + = ? ? ? = ? (13) a rise in voltage (v p ? p ) due to ? q 1 : 1 out pk l l 1 p p t 2 i i c 1 c q ? v ? ? ? ? ? ? ? + ? = = ? (14) when taking into consideration i out to be consumed during t 1 and the equivalent series resistance (r esr ) of c l : l 1 out esr out pk out pk l l 1 p p c t i r 2 i i 1 t 2 i i c 1 c q v ? ? ? ? ? ? ? ? ? + + ? ? ? ? ? ? ? + ? = ? = ? (15) when substituting equation ( 11) for equation (15) : esr out pk l off pk 2 out pk p p r 2 i i c t i 2 ) i i ( v ? ? ? ? ? ? ? + + ? ? = ? (16) therefore to reduce the ripple voltage, it is important t hat the capacitor connected to the output pin has a large capacity and a small r esr .
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 19 ? external parts selection 1. inductor to minimize the loss due to inductor direct current resistance, select an inductor with the smallest possible direct current resistance (less than 1 ? ). set the inductance value (l value) to around 22 h to 1 mh. to make the average value of the output voltage (v out ) constant, it is necessary to supply the energy corresponding to the output current (i out ) from the inductor. the amount of charge required for i out is i out (t on + t off ). because the inductor can supply energy only during t off , the charge is obtained by integrating equation (7) in the ? 3. operation ? in the ? ? operation ? with 0 t off , namely, off pk t 2 i ? . thus, ) t t ( i t 2 i off on out off pk + = ? (17) out off off on pk i t t t 2 i ? + ? = (18) when the oscillation duty ratio of osc is 75%, i pk = 8 ? i out . therefore, an i pk current which is eight times i out flows into transistor (m1). the s-8351 series includes a switching current controller which monitors the current flowing into the cont pin by the voltage (cont control voltage) and controls the current. this controller prevents destruction of the ic due to excess current. if an inductor with a large l value is selected, both i pk and i out decrease. since the energy stored in the inductor is equal to 2 pk ) i ( l 2 1 ? , the energy decreases because i pk decreases in steps of squares offsetting the increase of l value. as a result, stepping up at a low voltage becomes difficult and the minimum operating input voltage becomes high. however, the direct current resistance loss of l value and the m1 transistor decreases by the amount i pk decreased, and the inductance efficiency improves. on the other hand, if an inductor with a smaller l value is selected, both i pk and i out increase. accordingly, the minimum operating input voltage becomes low but the inductance efficiency deteriorates. caution an excessively large i pk may cause magnetic saturation for some core materials, leading to the destruction of the ic. use a core with material that satisfies i sat *1 > i pk *1. level of current that causes magnetic saturation. 2. diode use an external diode that meets the following requirements : ? low forward voltage : v f < 0.3 v ? high switching speed : 500 ns max. ? reverse voltage : v out + v f or more ? current rate : i pk or more
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 20 3. capacitor (c in , c l ) a capacitor on the input side (c in ) improves the efficiency by reducing t he power impedance and stabilizing the input current. select a c in value according to the impedance of the power supply used. a capacitor on the output side (c l ) is used for smoothing the output voltage. for step-up types, the output voltage flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. therefore, select an appropriate capacitor in accordance with the ripp le voltage, which increases in case of a higher output voltage or a higher load current. the capacitor value should be 10 f or more. a capacitor at the output side (c l ) is used for smoothing the ripple voltage. select an appropriate capacitor with a small equivalent series resistance (r esr ) and a large capacitance. the capacitor value should be 10 f or mpre. a tantalum electrolytic capacitor and an organic semiconduc tor capacitor are especially recommended because of their superior low-temperature and leakage current characteristics. 4. external transistor (s-8352 series) for the s-8352 series, connecting an external transistor in creases the output current. an enhancement (n-channel) mos fet type or a bipolar (npn) type can be used as the external transistor. 4. 1 enhancement (n-channel) mos fet type figure 19 is a circuit example using a mos fet transistor (n-channel). v out ext vout + ? off / on *1 vss + ? *1. for a type. figure 19 circuit example using mos fet (n-channel) type an n-channel power mos fet should be used for the mos fet. in particular, the ext pin can drive a mos fet with a gate capacitance of around 1000 pf. 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. a large current may flow during startup, depending on the mos fet selection. the s-8352 series does not feature overcurrent protection for the external mos fet, so perform sufficient evaluation using the actual devices. also recommend to use a mos fet with an input capacitance of 700 pf or less. since the on-resistance of the mos fet might depend on the difference between the output voltage (v out ) and the threshold voltage of the mos fet, and affect the output current as well as the efficiency, the threshold voltage should be low. when the output voltage is as low as 2.0 v, like in the s-8352a20, the circuit operates only when the mos fet has a threshold voltage lower than the output voltage.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 21 4. 2 bipolar (npn) type a circuit example using the cph3210 (h fe = 200 to 560) from sanyo electric co., ltd. as a bipolar transistor (npn) is shown in figure 24 to 26 in the ? ? standard circuits ?. the h fe value and r b value of the bipolar transistor determine the driving capacity to increase the ou tput current using a bipolar transistor. a peripheral circuit example of the transistor is shown in figure 20 . nch pch vout *1 i pk ext c b 2200 pf r b 1 k ? *1. v dd for d type. figure 20 external transistor peripheral circuit the recommended r b value is around 1 k ? . actually, calculate the necessary base current (i b ) from the bipolar transistor (h fe ) using fe pk b h i i = , and select the smaller r b value than exth b out b i 4 . 0 i 7 . 0 v r ? ? = *1 . a small r b value can increase the output current, but the efficiency decreases. since a current may flow on the pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the optimum r b value should be determined by experiment. connecting the speed-up capacitor (c b ) in parallel with the r b resistance as shown in figure 20 , decreases switching loss and improves the efficiency. the c b value is calculated according to 7 . 0 f r 2 1 c osc b b ? ? ? . select a c b value after performing sufficient evaluation since the optimum c b value differs depending upon the characteristics of the bipolar transistor. *1. for d type, exth b dd b i 4 . 0 i 7 . 0 v r ? ? = .
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 22 5. v dd / v out separate type (for s-8351/8352 series d type) the d type provides separate internal circuit power supply (vdd pin) and output voltage setting pin (vout pin) in the ic, making it ideal for the following applications. (1) changing the output voltage value using an external resistor (2) setting a high output voltage value, such as + 15 v cautions 1. this ic starts a step-up operation at v dd = 0.8 v, but set 1.8 v dd 10 v to stabilize the output voltage and frequency of the oscillator. (input a voltage of 1.8 v or more at the vdd pin for all products with a setting less than 1.9 v.) an input voltage of 1.8 v or more at the vdd pin allows connection of the vdd pin to either the input voltage vin pin or output vout pin. 2. choose external resistors r a and r b so as to not affect the output voltage, considering that there is impedance between the vout pin and vss pin in the ic chip. the internal resistance between the vout pin and vss pin is as follows : (1) s-835xx18 : 2.1 m ? to 14.8 m ? (2) s-835xx20 : 1.4 m ? to 14.8 m ? (3) s-835xx30 : 1.4 m ? to 14.2 m ? (4) s-835xx50 : 1.4 m ? to 12.1 m ? 3. attach a capacitor (c c ) in parallel to the r a resistance when an unstable event such as oscillation of the output voltage occurs. calculate c c using the following equation : [] khz 20 r 2 1 c a c ? ? ? = f
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 23 ? standard circuits 1. s-8351 series (1) a type c l v ref protection circuit l cont sd vout vss v in c in pfm control circuit + ? off / on + ? + ? figure 21 (2) b and c types v ref protection circuit l cont sd vout vss v in c l c in pfm control circuit + ? + ? + ? figure 22
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 24 (3) d type v ref protection circuit l cont sd vss v in c l c in pfm control circuit ic internal power supply vdd c c r b r a vout + ? + ? + ? figure 23 caution the above connection diagram will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 25 2. s-8352 series (1) a type c l v ref sd vout vss 2200 pf 1 k ? c in v in ext pfm control circuit l + ? + ? + ? off / on figure 24 (2) b and c types c l v ref sd vout vss pfm control circuit 2200 pf 1 k ? c in v in ext l + ? + ? + ? figure 25
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 26 (3) d type c l v ref sd vdd vss pfm control circuit 2200 pf 1 k ? c in v in ext l c c r b r a vout + ? + ? + ? ic internal power supply figure 26 caution the above connection diag ram and constants will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 27 ? precautions ? mount the external capacitors, the diode, and the coil as close as possible to the ic. ? characteristics ripple voltage and spike noise occur in ic containing switching regulators. moreover, rush current flows at the time of a power supply injection. because they largely depend on the coil and the capacitor and impedance used, fully check them using an actually mounted model. ? make sure that the dissipation of the switching transisto r (especially at a high temperature) does not exceed the allowable power dissipation of the package. ? the performance of this ic varies depending on the design of the pcb patterns, peripheral circuits and external parts. thoroughly test all settings with your device. also, try to use the recommended external parts. if not, contact an sii sales person. ? when the impedance of the power supply is high, the shutdown pin is switched from ?l? to ?h?, or v in is connected to the power supply, note that the power supply voltage drops te mporarily because a rush current flows into the power supply. ? do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the built-in electrostatic protection ic. ? sii claims no responsibility for any and all disputes arising out of or in connection with any infr ingement of the products including this ic upon patents owned by third party.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 28 ? characteristics (typical data) 1. input voltage (v in ) vs. powe supply input current at no load (i in ) ta = 25 c 0 5 10 15 20 25 30 35 40 45 50 0 1 2 3 4 5 v in [ v ] i in [ a] s-8351a30mc s-8351a50mc 2. output voltage (v out ) vs. current consumption 1 (i ss1 ) s-8351a s-8352a 0 20 40 60 80 i ss1 [ a] 1 2 3 4 5 6 7 v out [v] ta = 25 c 0 20 40 60 80 i ss1 [ a] v out [v] 1234 5 6 7 ta = 25 c 3. temperature (ta) vs. current consumption 1 (i ss1 ) 0 20 30 40 50 i ss1 [ a] 10 ? 50 ? 25 0 25 50 75 100 ta [ c ] s-8351a30mc s-8351a50mc 0 20 30 40 50 i ss1 [ a] 10 ? 50 ? 25 0 25 50 75 100 ta [ c ] s-8352a30mc s-8352a50mc 4. output voltage (v out ) vs. current consumption 2 (i ss2 ) 5. temperature (ta) vs. current consumption 2 (i ss2 ) ta = 25 c 0 1 2 3 4 i ss2 [ a] v out [ v ] 1 2 3 4 5 6 7 5 0 2 3 4 5 i ss1 [ a] 1 ? 50 ? 25 0 25 50 75 100 ta [ c ] s-8351a30mc s-8351a50mc
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 29 6. temperature (ta) vs. oscillation frequency (f osc ) 100 110 120 130 140 ? 50 ? 25 0 25 50 75 100 ta [ c ] f osc [khz] 80 90 s-8351a30mc s-8351a50mc 7. temperature (ta) vs. duty ratio 1 (duty1) 8. temperature (ta) vs. duty ratio 2 (duty2) duty1 [%] 70 72 74 76 78 80 ? 50 ? 25 0 25 50 75 100 ta [ c] s-8351a30mc s-8351a50mc duty2 [%] 45 47 49 51 53 55 ? 50 ? 25 0 25 50 75 100 ta [ c ] s-8351a30mc s-8351a50mc 9. output voltage (v out ) vs. switching current (i sw ) 10. temperature (ta) vs. switching current (i sw ) ta = 25 c 0 50 0 1 2 3 4 5 6 7 v out [ v ] i sw [ma] 100 150 200 250 300 400 i sw [ma] ? 50 ? 25 0 25 50 75 100 ta [ c ] 0 50 200 250 300 350 150 100 s-8351a30mc s-8351a50mc 11. output voltage (v out ) vs. ext pin output current ?h? (i exth ) 12. temperature (ta) vs. ext pin output current ?h? (i exth ) ta = 25 c 10 15 20 25 30 35 i exth [ma] 0 1 2 3 4 5 6 7 v out [v] 0 5 0 10 20 30 40 i exth [ma] ? 50 ? 25 0 25 50 75 100 ta [ c] s-8352a30mc s-8352a50mc
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 30 13. output voltage (v out ) vs. ext pin output current ?l? (i extl ) 14. temperature (ta) vs. ext pin output current ?l? (i extl ) ta = 25 c 10 15 20 25 30 35 i extl [ma] 0 1 2 3 4 5 6 7 v out [v] 0 5 0 10 20 30 40 i extl [ma] ? 50 ? 25 0 25 50 75 100 ta [ c] s-8352a30mc s-8352a50mc 15. temperature (ta) vs. operation start voltage (v st1 ) 16. temperature (ta) vs. retention voltage (v hld ) 0.6 0.7 0.8 0.9 1.0 v st1 [v] ? 50 ? 25 0 25 50 75 100 ta [ c ] s-8351a30mc s-8351a50mc 0.4 0.5 0.6 0.7 0.8 v hld [v] ? 50 ? 25 0 25 50 75 100 ta [ c] 0.2 0.3 s-8351a30mc s-8351a50mc
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 31 17. transient response characteristics the conditions for external parts are the same as t hose specified in the electrical characteristics. (1) power-on (ta = 25 c, r l = 250 ? ) s-8351a30mc v in = 0 1.8 v s-8351a50mc v in = 0 3 v t [0.2 ms / div] input voltage [ 0.5 v / div ] output voltage [0.5 v / div] 0 v 0 v 1.8 v 3 v t [0.2 ms / div] input voltage [1 v / div] output voltage [1 v / div] 0 v 0 v 3 v 5 v s-8352a30mc v in = 0 1.8 v s-8352a50mc v in = 0 3 v t [0.2 ms / div] input voltage [0.5 v / div] output voltage [0.5 v / div] 0 v 0 v 1.8 v 3 v t [0.2 ms / div] input voltage [1 v / div] output voltage [1 v / div] 0 v 0 v 3 v 5 v (2) power supply voltage fluctuation (ta = 25 c, r l = 250 ? ) s-8351a30mc v in = 1.2 1.8 v s-8351a30mc v in = 1.8 1.2 v t [0.1 ms / div] input voltage [0.5 v /div] output voltage [ 0.1 v / div ] 1.2 v 1.8 v 3 v t [0.1 ms / div] input voltage [0.5 v / div] output voltage [0.1 v / div] 1.8 v 1.2 v 3 v s-8351a50mc v in = 2 3 v s-8351a50mc v in = 3 2 v t [0.1 ms / div] input voltage [0.5 v / div] output voltage [ 0.1 v / div ] 2 v 3 v 5 v t [0.1 ms / div] input voltage [0.5 v / div] output voltage [0.1 v / div] 3 v 2 v 5 v
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 32 s-8352a30mc v in = 1.2 1.8 v s-8352a30mc v in = 1.8 1.2 v t [0.1 ms / div] output voltage [0.1 v / div] 1.2 v 1.8 v 3 v input voltage [0.5 v /div] t [0.1 ms / div] input voltage [0.5 v / div] output voltage [0.1 v / div] 1.8 v 1.2 v 3 v s-8352a50mc v in = 2 3 v s-8352a50mc v in = 3 2 v t [0.1 ms / div] output voltage [ 0.1 v / div ] 2 v 3 v 5 v input voltage [ 0.5 v /div ] t [0.1 ms / div] input voltage [0.5 v / div] output voltage [0.1 v / div] 3 v 2 v 5 v (3) load current fluctuation (ta = 25 c) s-8351a30mc v in = 1.8 v, i out = 10 a 12 ma s-8351a30mc v in = 1.8 v, i out = 12 ma 10 a t [0.1 ms / div] output current output voltage [0.1 v / div] 3 v i out = 12 ma t [0.1 ms / div] output current output voltage [0.1 v / div] 3 v i out = 10 a s-8351a50mc v in = 3 v, i out = 10 a 20 ma s-8351a50mc v in = 3 v, i out = 20 ma 10 a t [0.1 ms / div] 5 v output current output voltage [0.1 v / div] i out = 20 ma t [0.1 ms / div] 5 v output current output voltage [0.1 v / div] i out = 10 a
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 33 s-8352a30mc v in = 1.8 v, i out = 10 a 12 ma s-8352a30mc v in = 1.8 v, i out = 12 ma 10 a t [0.1 ms / div] output current output voltage [0.1 v / div] 3 v i out = 12 ma t [0.1 ms / div] output current output voltage [0.1 v / div] 3 v i out = 10 a s-8352a50mc v in = 3 v, i out = 10 a 20 ma s-8352a50mc v in = 3 v, i out = 20 ma 10 a t [0.1 ms / div] 5 v output current output voltage [0.1 v / div] i out = 20 ma t [0.1 ms / div] 5 v output current output voltage [0.1 v / div] i out = 10 a (4) off on/ pin response (ta = 25 c, r l = 250 ? ) s-8351a30mc v in = 1.8 v s-8351a50mc v in = 3 v t [0.1 ms / div] output voltage [0.3 v / div] 3 v off off / on voltage on t [0.1 ms / div] output voltage [0.5 v / div] 5 v off off / on voltage on s-8352a30mc v in = 1.8 v s-8352a50mc v in = 3 v t [ 0.1 ms / div ] 3 v output voltage [0.3 v / div] off on off / on voltage t [ 0.1 ms / div ] 5 v output voltage [0.5 v / div] off on off / on voltage
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 34 ? reference data use this reference data to choose the external parts. this reference data makes it possible to choose the recommended external part based on the application and characteristics data. 1. external parts for reference data table 18 condition product name output voltage v power mos fet coil 1 s-8351a30mc 3.0 built-in cdrh6d28-470 2 s-8351a30mc 3.0 built-in cdrh6d28-101 3 s-8351a30mc 3.0 built-in cxlp120-101 4 s-8351a50mc 5.0 built-in cdrh6d28-101 5 s-8351a50mc 5.0 built-in cdrh125-221 6 s-8351a50mc 5.0 built-in cxlp120-470 7 s-8352a30mc 3.0 external cdrh6d28-220 8 s-8352a30mc 3.0 external cdrh6d28-101 9 s-8352a30mc 3.0 external cxlp120-470 10 s-8352a50mc 5.0 external cdrh6d28-220 11 s-8352a50mc 5.0 external cdrh6d28-101 12 s-8352a50mc 5.0 external cxlp120-101 the properties of the external parts are shown below. table 19 evaluation coil part product name manufacturer characteristics cdrh6d28-220 sumida corporation 22 h, dcr *1 = 0.128 ? , i max *2 = 1200 ma cdrh6d28-470 sumida corporation 47 h, dcr *1 = 0.238 ? , i max *2 = 800 ma cdrh6d28-101 sumida corporation 100 h, dcr *1 = 0.535 ? , i max *2 = 540 ma cdrh125-221 sumida corporation 220 h, dcr *1 = 0.4 ? , i max *2 = 800 ma cxlp120-470 sumitomo special metals co., ltd 47 h, dcr *1 = 0.95 ? , i max *2 = 450 ma coil cxlp120-101 sumitomo special metals co., ltd 100 h, dcr *1 = 2.5 ? , i max *2 = 200 ma *1. direct current resistance *2. maximum allowable current table 20 properties of external parts part product name manufacturer characteristics diode ma2z748 matsushita electronic components co., ltd. v f *1 = 0.4v, i f *2 = 0.3a (shottky type) capacitor (output capacitance) f93 nichicon corporation 16v, 47 f (tantalum type) transistor (npn) cph3210 sanyo electric co.,ltd. v cbo *3 = 40v, v ceo *4 = 30v hfe *5 = 200 min. (v ce = 2v, i c = 500ma) ft *6 = 290 mhz typ. (v ce = 10v, i c = 500ma) *1. forward voltage, *2. forward current, *3. collector-to-base voltage, *4. collector-to-emitter voltage, *5. dc current gain, *6. gain-bandwidth product caution the above values shown in the characteristics column of table 19 and 20 are based on the materials provided by each manufacture. however, consider the characteristics of the original materials when using the above products.
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 35 2. step-up characteristics (ta = 25 c) the data of the step-up characteristics ((a) input voltage (v in ) vs. output voltage (v out ) characteristics (input voltage stepped up), (b) input voltage (v in ) vs. output voltage (v out ) characteristics (input voltage stepped down), (c) output current (i out ) vs. output voltage (v out ) characteristics, (d) output current (i out ) vs. efficiency ( ) characteristics under conditions of 1 to 12 in table 18 is shown below. condition 1 s-8351a30mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 2.8 2.9 3.0 3.1 3.2 2.6 2.7 v out [v] v in [ v ] 2 3 4 1 0 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 20 ma i out = 50 ma i out = 100 ma 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 20 ma i out = 50 ma i out = 100 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 2.8 2.9 3.0 3.1 i out [ma] v out [v] 100 150 200 50 0 3.2 2.6 2.7 250 v in = 1.0 v, v in = 2.0 v v in = 1.5 v, v in = 2.5 v v in = 1.8 v 50 60 70 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 v in = 1.0 v v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 80 90 condition 2 s-8351a30mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 20 ma i out = 50 ma i out = 100 ma 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 20 ma i out = 50 ma i out = 100 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 3.0 2.8 2.9 3.1 i out [ ma ] v out [v] 100 150 200 50 0 3.2 2.6 2.7 250 v in = 1.0 v, v in = 2.0 v v in = 1.5 v, v in = 2.5 v v in = 1.8 v 50 60 70 80 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 90 v in = 1.0 v v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 36 condition 3 s-8351a30mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 20 ma i out = 50 ma 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 20 ma i out = 50 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 3.0 2.8 2.9 3.1 i out [ ma ] v out [v] 100 150 200 50 0 3.2 2.6 2.7 250 v in = 1.0 v v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 50 60 70 [%] i out [ma] 1 10 100 1000 0.1 0.01 v in = 1.0 v v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 80 90 condition 4 s-8351a50mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 4.8 4.9 5.0 5.1 v in [ v ] v out [v] 2 3 5 1 0 5.2 4.6 4.7 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 4.8 4.9 5.0 5.1 v in [v] v out [v] 5.2 4.6 4.7 23 5 1 04 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 5.1 5.0 4.8 4.9 i out [ma] v out [v] 100 150 200 50 0 5.2 4.6 4.7 250 v in = 1.5 v v in = 2.0 v v in = 3.0 v 60 70 80 90 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 100 v in = 1.0 v v in = 1.5 v v in = 2.0 v v in = 3.0 v v in = 4.0 v
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 37 condition 5 s-8351a50mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 4.8 4.9 5.0 5.1 v in [v] v out [v] 2 3 5 1 0 5.2 4.6 4.7 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 4.8 4.9 5.0 5.1 v in [v] v out [v] 4.6 4.7 23 5 1 04 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 5.2 (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 4.8 4.9 5.0 5.1 i out [ma] v out [v] 100 150 200 50 0 5.2 4.6 4.7 250 v in = 1.5 v v in = 2.0 v v in = 3.0 v 60 70 80 90 [%] i out [ma] 1 10 100 1000 0.1 0.01 100 v in = 1.0 v v in = 1.5 v v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 6 s-8351a50mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 4.8 4.9 5.0 5.1 v in [ v ] v out [v] 2 3 5 1 0 4.6 4.7 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 5.2 4.8 4.9 5.0 5.1 v in [v] v out [v] 4.6 4.7 23 5 1 04 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 5.2 (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 4.8 4.9 5.0 5.1 i out [ma] v out [v] 5.2 4.6 4.7 100 150 200 50 0 250 v in = 1.5 v v in = 2.0 v v in = 3.0 v 50 60 70 80 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 90 v in = 1.0 v v in = 1.5 v v in = 2.0 v v in = 3.0 v v in = 4.0 v
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 38 condition 7 s-8352a30mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 2.8 2.9 3.0 3.1 v in [v] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 2.8 2.9 3.0 3.1 v in [v] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 0 ma i out = 50 ma i out = 100 ma i out = 150 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 2.8 2.9 3.0 3.1 i out [ma] v out [v] 100 150 200 50 0 3.2 2.6 2.7 250 300 350 v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 50 60 70 80 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 90 v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v condition 8 s-8352a30mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 2.8 2.9 3.0 3.1 v in [v] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 2.8 2.9 3.0 3.1 i out [ ma ] v out [v] 3.2 2.6 2.7 100 150 200 50 0 250 300 350 v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 50 60 70 80 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 90 v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v
step-up, built-in / external fet pf m control switching regulator / switching regulator controller rev.2.4 _00 s-8351/8352 series seiko instruments inc. 39 condition 9 s-8352a30mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 2.8 2.9 3.0 3.1 v in [v] v out [v] 2 3 4 1 0 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 3.2 2.8 2.9 3.0 3.1 v in [ v ] v out [v] 2 3 4 1 0 3.2 2.6 2.7 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) i ou t [ ma ] v out [v] 100 150 200 50 2.8 2.9 3.0 3.1 3.2 2.6 2.7 0 250 300 350 v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 50 60 70 80 [%] i out [ ma ] 1 10 100 1000 0.1 0.01 v in = 1.5 v v in = 1.8 v v in = 2.0 v v in = 2.5 v 90 condition 10 s-8352a50mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 4.8 4.9 5.0 5.1 v in [ v ] v out [v] 2 3 5 1 0 5.2 4.6 4.7 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 4.8 4.9 5.0 5.1 v in [v] v out [v] 5.2 4.6 4.7 23 5 1 04 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 4.8 4.9 5.0 5.1 i out [ma] v out [v] 100 200 300 50 0 5.2 4.6 4.7 400 150 250 350 450 v in = 1.5 v v in = 2.0 v v in = 3.0 v v in = 4.0 v 50 60 70 80 [%] i out [ma] 1 10 100 1000 0.1 0.01 90 v in = 2.0 v v in = 3.0 v v in = 4.0 v
step-up, built-in / external fet pf m control switching regulator / switching regulator controller s-8351/8352 series rev.2.4 _00 seiko instruments inc. 40 condition 11 s-8352a50mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 4.8 4.9 5.0 5.1 v in [v] v out [v] 2 3 5 1 0 4.6 4.7 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma 5.2 v in [ v ] v out [v] 23 5 1 4.8 4.9 5.0 5.1 5.2 4.6 4.7 0 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma i out = 150 ma (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 4.8 4.9 5.0 5.1 i out [ma] v out [v] 4.6 4.7 100 200 300 50 0 400 150 250 350 450 v in = 1.5 v v in = 2.0 v v in = 3.0 v v in = 4.0 v 5.2 50 60 70 90 80 [%] i out [ma] 1 10 100 1000 0.1 0.01 v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 12 s-8352a50mc (a) input voltage (v in ) vs. output voltage (v out ) (input voltage raising) (b) input voltage (v in ) vs. output voltage (v out ) (input voltage falling) 4.8 4.9 5.0 5.1 v in [v] v out [v] 2 3 5 1 0 5.2 4.6 4.7 4 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma 4.8 4.9 5.0 5.2 v in [ v ] v out [v] 4.6 4.7 23 5 1 04 6 i out = 0.1 ma i out = 1 ma i out = 10 ma i out = 50 ma i out = 100 ma 5.1 (c) output current (i out ) vs.output voltage (v out ) (d) output current (i out ) vs. efficiency ( ) 4.8 4.9 5.0 5.1 i out [ ma ] v out [v] 5.2 4.6 4.7 100 200 300 50 0 400 150 250 350 450 v in = 2.0 v v in = 3.0 v v in = 4.0 v 50 60 70 80 [%] i out [ma] 1 10 100 1000 0.1 0.01 90 v in = 3.0 v v in = 4.0 v

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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.

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