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pwm step-up dc/dc converter with voltage regulator and detector 1 rs5rm series outline the rs5rm series are cmos-based step-up dc/dc converter ics equipped with a voltage regulator (vr) and a voltage detector (vd). each of these step-up dc/dc converter ics consists of a pwm dc/dc converter, a linear regulator and a voltage detector. these ics are output-voltage-fixed type regulators which function as a linear regulator when input voltage is high, and as step-up dc/dc converter+linear regulator when input voltage is low, by using an inductor, a diode and a capacitor as external parts for the ics. since a voltage detector is built in these ics, the potentials such as the output voltage of dc/dc converters can be monitored. in addition, these step-up dc/dc converter ics are suitable for battery-powered and hand-held instruments because internal circuits can be turned off by the chip enable function so that the standby current can be mini- mized. ?low supply current .......................................... typ. 55? (rs5rm3624a : v in =3.0v,at no load) ?standby mode ..................................................... istandby=max. 1.0? (rs5rmxxxxa) istandby=max. 10.0a (rs5rmxxxxb) ?low voltage operation possible ....................... operating voltage v in =1.2v to 10v ?high output voltage accuracy ......................... fixed output voltage accuracy?.5% ?high voltage detection accuracy ..................... ?.5% ?output voltage can be set at user's request (refer to selection guide). ?voltage close to battery's voltage can be output because these ics are of a step-up / step-down type (ex. a fixed voltage of 3v can be output by a 3v battery). ?soft start function, built-in protection circuits for lx driver ?phase compensation circuits built in ?pin for external driver is equipped, and a large current output can be obtained. ?small packages .................................................. 8pin sop features applications ?power source for cameras, camcorders, and hand-held audio equipment. ?power source for small oa apparatus such as note book personal computers,and word processors. ?power source for hand-held communication appliances such as pagers,cordless telephones, and cellular phones. no. ea-018-0311
2 rs5rmxxxxx e xx + + + v ss ce vd out vd in soft start vref1 vref2 pwm osc v lx limiter 1 2 3 45 6 7 8 l x ext v dd v out } } }
3 pin configuration 8pin sop pin description 1 2 3 4 8 7 6 5 rs5rm pin no. symbol 1v ss 2ce 3vd out 4vd in 5v out 6v dd 7 ext 8l x pin description ground pin chip enable pin voltage detector output pin.nch open drain output detection input pin of voltage detector output pin for regulator step-up output pin.power supply pin external transistor drive pin external inductor drive pin.
4 topt=25?c,vss=0v rs5rm absolute maximum ratings symbol item v dd supply voltage v lx l x pin voltage v ext output voltage ext pin voltage v out v out pin voltage vd out vd out pin voltage v ce input voltage ce pin voltage vd in vd in pin voltage a version b version i lx inductor drive output current lx pin current i ext ext pin current p d power dissipation topt operating temperature range tstg storage temperature range tsolder lead temperature (soldering) absolute maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. moreover, such values for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are stress ratings only and do not necessarily imply functional operation below these limits. absolute maximum ratings rating unit e 0.3 to +12 v vsse 0.3 to +12 v vss e 0.3 to v dd +0.3 v vss e0.3 to v dd +0.3 v vsse0.3 to +12 v vsse0.3 to v dd +0.3 v vsse0.3 to v dd +0.3 v vss e 0.3 to + 12 250 ma 50 ma 300 mw e30 to +80 ?c e55 to +125 ?c 260?c, 10s
5 electrical characteristics rs5rm rs5rm3624a,b topt=25?c (note 1) standby current of version a (note 2) standby current of version b please refer to basic circuit for test circuit. symbol item v in operation input voltage v dd step-up output voltage voscst oscillator start-up voltage vhold hold-on voltage fosc oscillator frequency maxdty oscillator maximum duty cycle v ol 1 lx output voltage i oh 1 lx leakage current v lx lim lx voltage limit v oh ext output pch on voltage v ol 2 ext output nch on voltage v out output voltage v dif dropout voltage ? ?
6 rs5rm rs5rm5045a,b topt=25?c (note 1) standby current of version a (note 2) standby current of version b please refer to basic circuit for test circuit. symbol item v in operation input voltage v dd step-up output voltage voscst oscillator start-up voltage vhold hold-on voltage fosc oscillator frequency maxdty oscillator maximum duty cycle v ol 1 lx output voltage i oh 1 lx leakage current v lx lim lx voltage limit v oh ext output pch on voltage v ol 2 ext output nch on voltage v out output voltage v dif dropout voltage ? ?
7 rs5rm operation of step-up dc / dc converter step-up dc/dc converter charges energy in the inductor when lx transistor (lxtr) is on, and discharges the energy with the addition of the energy from input power source thereto when lxtr is off, so that a higher out- put voltage than the input voltage is obtained. the operation will be explained with reference to the following diagrams : < current through l > < basic circuits > i2 sd l x tr i1 l cl v in i out v out il il min il max topen ton toff t t=1/ fosc step.1: lxtr is turned on and current il (=i1 ) flows, so that energy is charged in l. at this moment, il(=i1 ) is increased from ilmin (=0) to reach ilmax in proportion to the on-time period (ton) of lxtr. step.2: when lxtr is turned off, schottky diode (sd) is turned on in order that l maintains il at ilmax, so that current il (=i2) is released. step.3: il (=i2) is gradually decreased, and in the case of discontinuous mode, il reaches ilmin (=0) after a time period of topen, so that sd is turned off. in the case of a continuous mode,the time period (toff) runs out before il reaches ilmin (=0), so that lxtr is turned on in the next cycle, and sd is turned off. in this case, ilmin does not reach zero, and il (=i1) increases from ilmin (>0). in the case of pwm control system, with the oscillator frequency (fosc) maintained constant, the output volt- age is maintained constant by controlling the on-time period (ton).
8 rs5rm e + e + l x tr l x pwm osc vref1 vref2 pch tr v ss 100f 100h v dd v out v out v in 22f 1f 5 1 86 fig. a diagram of rs5rm including external circuits operation 1. v dd output voltage v dd output voltage is shown in fig. b. (1) in the case of v in evf area a v dd 0 v dd area b v out v dd 0+vf 1.2v 10v input voltage (v) output voltage (v) v out 0 fig. b output voltage vs. input voltage characteristic
9 rs5rm test circuits v ss 1f 100f 100h v out v dd vd in vd out v in ce l x ext note1 i in c out 22f c vdd a c in a vv oscilloscope v in v ss v out v dd vd in vd out ce l x ext oscilloscope 100k ? oscilloscope v in v ss v out v dd vd in vd out ce l x ext test circuit 1 test circuit 2 test circuit 3 100f 100h v in i in c in digitizing oscilloscope digitizing oscilloscope (for trigger) v ss v out v dd vd in vd out ce l x ext 33k ? a a + pulse generator v ss v out v out v dd vd in vd out vd in ce l x ext a open 5.5v test circuit 5 test circuit 4
10 rs5rm 1f 100h v in i in c in c vdd 22f c out 1f digitizing oscilloscope v ss v out v dd vd in vd out ce l x ext 100 ? a a + + + pulse generator test circuit 6 1 f c in c out 1 f digitizing oscilloscope v ss v out v dd vd in vd out ce l x ext v in pulse generator 100 ? 220 ? c vdd 22 f + 100 h + + test circuit 7 i in c out v out v dd v ss v dd v out i out i dd ce ext v in a c vdd a a load npn tr c in cb rb d l rs5rm test circuit 8 l : 47h(sumida electric cd105) d : schottky diode (hitachi hrp22) c in : 220f(aluminum electrolytic type) rb : 220 ? cb : 0.01f c vdd : 220f(aluminum electrolytic type) c out : 1f(tantalum type)
11 rs5rm by use of these test circuits,the typical characteristics were obtained as shown in the following pages: test circuit 1: typical characteristics 1) 2) 3) 4) 5) 9) 10) 13) 14) 16) (typical characteristics 13) and 14) were measured by replacing the capacitor shown in note1 with a 1f capacitor) test circuit 2: typical characteristics 11) 12) test circuit 3: typical characteristics 7) 8) efficiency
12 rs5rm typical characteristics 1) output voltage vs. input voltage (topt=25?c) rs5rm5045a input voltage v in (v) 0 2 46 8 10 output voltage v out (v) 4.0 4.5 5.0 5.5 i out =10ma i out =20ma i out =30ma i out =40ma input voltage v in (v) 0 246 8 10 output voltage v out (v) 3.0 3.5 4.0 4.5 i out =10ma i out =20ma i out =30ma i out =40ma rs5rm3624a input voltage v in (v) 0 246 8 10 output voltage v out (v) 2.5 3.0 3.5 4.0 i out =10ma i out =20ma i out =30ma i out =40ma rs5rm3329a input voltage v in (v) 0 24 6 8 10 output voltage v out (v) 2.5 3.0 3.5 4.0 i out =10ma i out =20ma i out =30ma i out =40ma rs5rm4036a rs5rm3531a input voltage v in (v) 02468 10 output voltage v out (v) 2.5 3.0 3.5 4.0 i out =10ma i out =20ma i out =30ma i out =40ma rs5rm3027a input voltage v in (v) 0 2 46 8 10 output voltage v out (v) 2.0 2.5 3.0 3.5 i out =10ma i out =20ma i out =30ma i out =40ma
13 rs5rm 2) output voltage vs. output current (topt=25?c) rs5rm5045a output current i out (ma) output voltage v out (v) 0 50 100 150 4.0 4.5 5.0 5.5 v in =2v v in =4v v in =3v v in =5v output current i out (ma) 0 50 100 150 output voltage v out (v) 3.0 3.5 4.0 4.5 v in =2v v in =3v v in =4v rs5rm3624a output current i out (ma) 0 50 100 150 output voltage v out (v) 2.5 3.0 3.5 4.0 v in =4v v in =3v v in =2v rs5rm3329a output current i out (ma) 0 20 40 60 80 100 output voltage v out (v) 2.5 3.0 3.5 4.0 v in =3v v in =2v rs5rm4036a rs5rm3531a output current i out (ma) 0 20 40 60 80 100 output voltage v out (v) 2.5 3.0 3.5 4.0 v in =3v v in =2v rs5rm3027a output current i out (ma) 020 40 60 80 100 output voltage v out (v) 2.0 2.5 3.0 3.5 v in =3v v in =2v
14 rs5rm 3) ripple voltage vs. output current (topt=25?c) rs5rm5045a ripple voltage vr (mvp-p) output current i out (ma) 0 10 20 30 40 50 0 5 10 15 20 25 30 35 40 45 2.0v 3.0v 4.0v l=100h c out =22f tantalum v in =1.2v output current i out (ma) 01020 30 40 50 ripple voltage vr (mvp-p) 0 5 10 15 20 25 30 35 40 45 2.0v 3.0v 4.0v l=47h c out =22f tantalum v in =1.2v rs5rm5045a output current i out (ma) 01020 30 40 50 ripple voltage vr (mvp-p) 0 5 10 15 20 25 30 35 40 45 2.0v 3.0v 4.0v l=100h c out =47f tantalum v in =1.2v rs5rm5045a output current i out (ma) 01020304050 ripple voltage vr (mvp-p) 0 5 10 15 20 25 30 35 40 45 2.0v 3.0v 4.0v l=100h c out =100f alminum electrolytic v in =1.2v rs5rm5045a rs5rm5045a output current i out (ma) 0 2040 6080 ripple voltage vr (mvp-p) 0 5 10 15 20 25 30 35 40 45 2.0v 3.0v 4.0v l=220h c out =22f tantalum v in =1.2v
15 rs5rm 4) efficiency vs. input voltage (topt=25?c) rs5rm5045a input voltage v in (v) efficiency (%) 0246810 20 40 60 80 100 i out =40ma i out =30ma i out =20ma i out =10ma input voltage v in (v) 0246810 efficiency (%) 20 40 60 80 100 i out =40ma i out =30ma i out =20ma i out =10ma rs5rm3624a input voltage v in (v) 0246810 efficiency ( %) 20 40 60 80 100 i out =40ma i out =30ma i out =20ma i out =10ma rs5rm3329a input voltage v in (v) efficiency (%) 0246810 20 40 60 80 100 i out =40ma i out =30ma i out =20ma i out =10ma rs5rm4036a rs5rm3531a input voltage v in (v) efficiency (%) 0246810 20 40 60 80 100 i out =40ma i out =30ma i out =20ma i out =10ma rs5rm3027a input voltage v in (v) 0246810 efficiency (%) 20 40 60 80 100 i out =40ma i out =30ma i out =20ma i out =10ma
16 rs5rm 5) efficiency vs. output current (topt=25?c) rs5rm5045a efficiency (%) 40 30 50 60 80 70 90 100 output current i out (ma) 04060 80 20 v in =5v v in =4v v in =3v v in =2v 100 v in =4v v in =3v v in =2v efficiency (%) 40 30 50 60 80 70 90 100 output current i out (ma) 04060 80 20 100 rs5rm3624a v in =4v v in =3v v in =2v efficiency (%) 40 30 50 60 80 70 90 100 output current i out (ma) 04060 80 20 100 rs5rm3329a v in =3v v in =2v efficiency (%) 40 30 50 60 80 70 90 100 output current i out (ma) 04060 80 20 100 rs5rm4036a rs5rm3531a v in =3v v in =2v efficiency (%) 40 30 50 60 80 70 90 100 output current i out (ma) 04060 80 20 100 rs5rm3027a v in =3v v in =2v efficiency (%) 40 30 50 60 80 70 90 100 output current i out (ma) 04060 80 20 100
17 rs5rm 6) soft start time vs. input voltage (topt=25?c) rs5rm5045b c vdd =22f c out =1f input voltage v in (v) soft start time ts(ms) 0 10 20 30 40 50 60 1 2345 6 40ma 10ma i out =1ma c vdd =22f c out =47f soft start time ts(ms) 0 10 20 30 40 50 60 input voltage v in (v) 1 2 34 5 6 10ma 40ma i out =1ma rs5rm5045b c vdd =22f c out =100f soft start time ts(ms) 0 10 20 30 40 50 60 1 2345 6 10ma 40ma i out =1ma rs5rm3624a oscillator maximum duty cycle maxdty (%) 80 40 60 100 temperature topt ( ? c) e 40 e 20 0 20406080 100 rs5rm5045b rs5rm3624a oscillator frequency f osc (khz) 10 20 80 40 60 100 temperature topt ( ? c) e 40 e 20 0 20 40 60 80 100 rs5rm3624a output voltage v dd (v) 4.1 3.7 3.9 4.3 temperature topt ( ? c) e 40 e 20 020406080 100 7) oscillator frequency vs. temperature 8) oscillator maximum duty cycle vs.temperature 9) output voltage (v dd ) vs.temperature
18 rs5rm 10) output voltage vs. temperature rs5rm3624a output voltage v out (v) 3.6 3.2 3.4 3.8 temperature topt ( ? c) e 40 e 20 0 20 40 60 80 100 detectoh threshold v det (v) 2.4 2.0 2.2 2.6 temperature topt ( ? c) e 40 e 20 0 20 40 60 80 100 rs5rm3624a 0 1 2 3 4 5 vd input voltage vd in (v) vd output voltage vd out (v) 1234 5 0 vd in pull-up resistor:100k ? temperature topt ( ? c) e 40 e 20 020406080 100 0 1 2 3 standby current istandby (a) b version a version rs5rm3624a rs5rmxxxxa supply current i dd (a) 0 100 200 300 input voltage v in (v) 0246 8 10 12 5045 4036 3624 3531 3329 3027 rs5rm5045a 0.0 0.2 0.4 0.6 0.8 1.0 vd input current i vdin (a) vd input voltage vd in (v) 012 34 5 6 v dd =5.5v 13) supply current vs. input voltage 14) standby current vs.temperature 15) vd input current vs. vd input voltage 11) detector threshold vs. temperature 12) vd output voltage vs. vd input voltage
19 rs5rm 16) start-up/hold-on voltage vs. output current 0 5 10 15 20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 output current i out (ma) start-up/hold-on voltage vstart/vhold(v) vstart vhold rs5rm5045a
20 rs5rm rs5rm5045a 17) load transient response e 2 0 24 6 8 10 12 time t (ms) 0 1 2 3 4 5 6 output voltage v out (v) 0 30 60 90 120 150 180 output current i out (ma) v in =3.0v c out =1f 1ma output voltage output current rs5rm5045a e 2 0 2 4 68 10 12 time t(ms) 0 1 2 3 4 5 6 outout voltage v out (v) 0 30 60 90 120 150 180 output current i out (ma) v in =5.0v c out =1f output current output voltage 1ma rs5rm5045a e 2 0 2 4 6 8 10 12 14 16 18 time t (ms) 0 1 2 3 4 5 6 output voltage v out (v) 0 30 60 90 120 150 180 output current i out (ma) v in =3.0v c out =47f output current output voltage 1ma
21 rs5rm rs5rm5045a e 202468 10 12 14 16 18 time t (ms) 0 1 2 3 4 5 6 output voltage v out (v) 0 30 60 90 120 150 180 output current i out (ma) v in =5.0v c out =47f output voltage output current 1ma rs5rm5045a v in =3.0v c out =100f e 202468 10 12 14 16 18 time t (ms) 0 1 2 3 4 5 6 output voltage v out (v) 30 60 90 120 150 180 output current i out (ma) output voltage output current 1ma rs5rm5045a v in =5.0v c out =100f e 202468 10 12 14 16 18 time t (ms) 0 1 2 3 4 5 6 output voltage v out (v) 30 60 90 120 150 180 output current i out (ma) output voltage output current 1ma
22 rs5rm rs5rm5045a 18) line transient response e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =1ma c out =1f output voltage input voltage rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =1ma c out =1f output voltage input voltage rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =30ma c out =1f output voltage input voltage
23 rs5rm rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =30ma c out =1f output voltage input voltage rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =1ma c out =47f output voltage input voltage rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =1ma c out =47f output voltage input voltage
24 rs5rm rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =30ma c out =47f output voltage input voltage rs5rm5045a e 2 0 2 468 10 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =30ma c out =47f output voltage input voltage rs5rm5045a e 2 0 2 468 10 14 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =1ma c out =100f output voltage input voltage
25 rs5rm rs5rm5045a e 2 0 2 468 10 14 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =1ma c out =100f output voltage input voltage rs5rm5045a e 2 0 2 468 10 14 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =30ma c out =100f output voltage input voltage rs5rm5045a e 2 0 2 468 10 14 12 time t (ms) 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 output voltage v out (v) 4 6 8 10 12 14 input voltage v in (v) i out =30ma c out =100f output voltage input voltage
26 rs5rm 19) output voltage vs. v dd output currrent rs5rm5045a 0 100 200 300 400 500 600 700 v dd output current i ddout (ma) 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 output voltage v out /v dd (v) i out =20ma v dd v out 2.0v 4.0v 3.0v v in =1.2v i out =40ma v dd v out 2.0v 4.0v v in =1.2v 3.0v 0 100 200 300 400 500 600 700 v dd output current i ddout (ma) 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 output voltage v out /v dd (v) rs5rm5045a i out =60ma v dd v out 2.0v 3.0v 4.0v v in =1.2v 0 100 200 300 400 500 600 700 v dd output current i ddout (ma) 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 output voltage v out /v dd (v) rs5rm5045a i out =40ma 3.0v 4.0v v in =1.2v 0 100 200 300 400 500 600 700 v dd output current i ddout (ma) 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) 2.0v rs5rm5045a rs5rm5045a i out =20ma 2.0v 3.0v 4.0v v in =1.2v 0 100 200 300 400 500 600 700 v dd output current i ddout (ma) 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) rs5rm5045a 0 100 200 300 400 500 600 700 v dd output current i ddout (ma) i out =60ma 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) 2.0v v in =1.2v 3.0v 4.0v 20) efficiency vs.v dd output current = (v dd i ddout )+(v out i out ) 100 v in i in (note) efficiency at typical characteristics 20) is shown by the following formula:
27 rs5rm basic circuit inductor diode vss v out + capacitor ext v dd v dd v in ce vd out vd in lx examples of parts : inductor : rcr-664d (100h) ; sumida electric co., ltd. diode : ma721 (schottky type) ; matsushita electronics corporation capacitor : 22f (tantalum type)
28 rs5rm typical applications current boost circuit 1 vss ext d rs5rm v dd v out ce v in l c in npn tr rb cb c vdd c out rbe cbe pnp tr v out l :47h(sumida electric cd105) d :schottky diode (hitachi hrp22) c in :220f(aluminum electrolytic type) cv dd :100f(tantalum type)/ 220f(aluminum electrolytic type) c out :47f(tantalum type) examples of components c d :0.01f cbe :0.1f(rs5rm5045 x ,rs5rm4036 x ,rs5rm3624 x ) 100 p f(rs5rm3531 x ,rs5rm3329 x ,rs5rm3027 x ) npn tr :2sd1628 pnp tr :2sa1213 rb :220 ? rbe :12 ? current boost circuit 2 (high efficiency circuit) vss ext ext d v dd v dd v out ce ce v in l c in npn tr rb1 cb c vdd c out rbe pnp tr v out rs5rm 5045x rn5rg 50a rb2 gnd l :47h(sumida electric cd105) d :schottky diode (hitachi hrp22) c in :220f(aluminum electrolytic type) c vdd :33f(tantalum type)/ 220f(aluminum electrolytic type) c out :47f(tantalum type) examples of components c d :0.01f npn tr :2sd1628 pnp tr :2sa1213 rb1 :220 ? rb2 :330 ? rbe :10k ? (note) high efficiency current boost circuit,using rs5rm5045x with rn5rg50a(ricoh voltage regulator).
rs5rm 29 when using these ics, be sure to take care of the following points: set external components as close as possible to the ic and minimize the connection between the components and the ic. in particular, when an external component is connected to v out pin, make minimum connection with the capacitor. make sufficient grounding. a large current flows through v ss pin by switching. when the impedance of the v ss connection is high, the potential within the ic is varied by the switching current. this may result in unstable operation of the ic. use capacitor with a capacity of 10f or more, and with good high frequency characteristics such as tantalum capacitor. we recommend the use of a capacitor with an allowable voltage which is at least three times the output set voltage. this is because there may be the case where a spike-shaped high voltage is generated by the inductor when lx transistor is turned off. take the utmost care when choosing a inductor. namely, choose such an inductor that has sufficiently small d.c. resistance and large allowable current, and hardly reaches magnetic saturation. when the inductance value of the inductor is small, there may be the case where i lx exceeds the absolute maximum ratings at the maximum load. use an inductor with an appropriate inductance. use a diode of a schottky type with high switching speed, and also take care of the rated current. the performance of power source circuits using these ics largely depends upon the peripheral components. take the utmost care in the selection of the peripheral components. in particular, design the peripheral circuits in such a manner that the values such as voltage, current and power of each component, pcb patterns and the ic do not exceed their respective rated values. application hints

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