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1 rev.1.1 ELM91xxxxa cmos pfm step-up dc/dc converter and controller general description parameter symbol limit unit apply voltage to lx pin vlx vss-0.3 to 7.0 v apply voltage to vout pin vout vss-0.3 to 7.0 v output current of lx pin ilx 500 ma output current of ext pin iext 20 ma power dissipation pd 500 (sot-89) mw 250 (sot-23) 150 (sc-70-5)(sot-353) operationg temperature top -40 to +85 c storage temperature tstg -55 to +125 c ? output voltage range : 1.8v to 5.5v (by 0.1v) ? low voltage operation : 0.9v(ELM91xx1xa: iout=1ma) ? oscillating frequency : typ.100khz ? low power operation : typ.40w(ELM91301xa: typ.100khz) ? high efficiency : 85%(ELM9130xxa: vin=1.5v, iout=10ma) ? output current(e.g.) : 100ma(vin=1.5v, vout=3.0v) ? package : sot-89, sot-23, sc-70-5(sot-353) ? constant voltage source for battery- operated devices ? portable communication equipments and video recorders ELM91xxxxa-x symbol a, b output voltage e.g. : 18: vout=1.8v 30: vout=3.0v 33: vout=3.3v 50: vout=5.0v c switching transistor 1: internal switch 3: external switch d package a: sot-89 b: sot-23 c: sc-70-5 (sot-353) e product version a f taping direction s , n: refer to pkg file ELM91 x x x x a - x a b c d e f features maximum absolute ratings selection guide application 22 - ELM91xx1xa is cmos pfm control step-up dc-dc converter; ELM91xx3xa is cmos pfm control step- up dc-dc controller, which has large output current capacity by using an external fet switch. ELM91 series consists of reference voltage source, error ampli?er, oscillation circuit, start-up circuit, pfm-control circuit, switching current limit circuit (ELM91xx1xa only), switching transistor (ELM91xx1xa only) and output voltage setting resistor. for external parts, coil, diode, mosfet and capacitor are possible choices. the standard output voltages are 1.8v,3.0v,3.3v,5.0v; ELM91 series can also be designed as semi-custom ic within the range of 1.8v to 5.5v by 0.1v step.
2 rev.1.1 sot-89(top view) 1 2 3 1 3 2 1 2 3 4 5 sot-23(top view) sc-70-5(top view) ELM91xxxaa ELM91xxxba ELM91xxxca pin no. pin name 1 vss 2 vout 3 ELM91xx1aa: lx ELM91xx3aa: ext pin no. pin name 1 vss 2 ELM91xx1ba: lx ELM91xx3ba: ext 3 vout pin no. pin name 1 nc 2 vout 3 nc 4 vss 5 lx, ext pin configuration standard circuit ELM91xxxxa cmos pfm step-up dc/dc converter and controller + c o u t m a 2 z 7 4 8 v i n v o u t l x v o u t v s s + c i n e l m 9 1 x x 1 x a 1 0 0 h ? 4 7 f ? 4 7 f ? + e l m 9 1 x x 3 x a m a 7 3 5 v i n v o u t e x t v o u t + v s s c i n c o u t 1 0 0 f ? 1 0 0 f ? 3 3 h ? v s s l x + - v r e f p . f . m . o s c s t a r t - u p l i m i t e r v l x v o u t v s s + - v r e f p . f . m . o s c e x t s t a r t - u p v o u t ELM91xx1xa ELM91xx3xa block diagram 22 -
3 rev.1.1 l=100h, cin=cout=47f, d=ma2z748, vss=0v, top=25c parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=1.5v 1.755 1.800 1.845 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 0.9 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout=vout(t)0.95 10 25 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of lx switch ron vout=vout(t)0.95 1.5 3.0 leakage current of lx pin ilxl vout=vlx=6v 1 a oscillating frequency fosc vout=vout(t)0.95 80 100 120 khz voltage limit of lx pin (lx switch on) vlxlim vout=vout(t)0.95 0.5 0.7 0.9 v duty ratio duty vout=vout(t)0.95 67 75 83 % electrical characteristics (ELM91xx1xa) ELM91181xa * vout: input voltage to out pin; vout(t): typ. value of vout. 22 - parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=1.5v 3.218 3.300 3.382 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 0.9 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout=vout(t)0.95 15 35 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of lx switch ron vout=vout(t)0.95 0.9 1.9 leakage current of lx pin ilxl vout=vlx=6v 1 a oscillating frequency fosc vout=vout(t)0.95 80 100 120 khz voltage limit of lx pin (lx switch on) vlxlim vout=vout(t)0.95 0.5 0.7 0.9 v duty ratio duty vout=vout(t)0.95 67 75 83 % l=100h, cin=cout=47f, d=ma2z748, vss=0v, top=25c ELM91331xa * vout: input voltage to out pin; vout(t): typ. value of vout. parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=1.5v 2.925 3.000 3.075 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 0.9 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout=vout(t)0.95 14 35 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of lx switch ron vout=vout(t)0.95 0.9 1.9 leakage current of lx pin ilxl vout=vlx=6v 1 a oscillating frequency fosc vout=vout(t)0.95 80 100 120 khz voltage limit of lx pin (lx switch on) vlxlim vout=vout(t)0.95 0.5 0.7 0.9 v duty ratio duty vout=vout(t)0.95 67 75 83 % l=100h, cin=cout=47f, d=ma2z748, vss=0v, top=25c ELM91301xa * vout: input voltage to out pin; vout(t): typ. value of vout. ELM91xxxxa cmos pfm step-up dc/dc converter and controller
4 rev.1.1 parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=3v 4.875 5.000 5.125 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 0.9 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout=vout(t)0.95 20 45 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of lx switch ron vout=vout(t)0.95 0.7 1.5 leakage current of lx pin ilxl vout=vlx=6v 1 a oscillating frequency fosc vout=vout(t)0.95 80 100 120 khz voltage limit of lx pin (lx switch on) vlxlim vout=vout(t)0.95 0.5 0.7 0.9 v duty ratio duty vout=vout(t)0.95 67 75 83 % l=100h, cin=cout=47f, d=ma2z748, vss=0v, top=25c ELM91501xa * vout: input voltage to out pin; vout(t): typ. value of vout. parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=1.5v 1.755 1.800 1.845 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 1.1 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout=vout(t)0.95, ext: no-load 10 25 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of ext high rexth vout=vout(t)0.95, vext=vout-0.4v 90 170 on-resistance of ext low rextl vout=vout(t)0.95, vext=0.4v 70 120 oscillating frequency fosc vout=vout(t)0.95 80 100 120 khz duty ratio duty vout=vout(t)0.95 67 75 83 % fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c ELM91183xa parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=1.5v 2.925 3.000 3.075 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 1.1 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout = vout (t)0.95, ext: no-load 14 35 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of ext high rexth vout=vout(t)0.95, vext = vout-0.4v 50 86 on-resistance of ext low" rextl vout=vout(t)0.95, vext = 0.4v 36 60 oscillating frequency fosc vout = vout (t)0.95 80 100 120 khz duty ratio duty vout=vout(t)0.95 67 75 83 % fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c ELM91303xa * vout: input voltage to out pin; vout(t): typ. value of vout. * vout: input voltage to out pin; vout(t): typ. value of vout. electrical characteristics (ELM91xx3xa) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
5 rev.1.1 parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=1.5v 3.218 3.300 3.382 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 1.1 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout = vout (t)0.95, ext: no-load 15 35 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of ext high rexth vout=vout(t)0.95, vext = vout-0.4v 46 83 on-resistance of ext low rextl vout=vout(t)0.95, vext = 0.4v 33 55 oscillating frequency fosc vout = vout (t)0.95 80 100 120 khz duty ratio duty vout=vout(t)0.95 67 75 83 % fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c ELM91333xa * vout: input voltage to out pin; vout(t): typ. value of vout. parameter symbol condition min. typ. max. unit output voltage vout iout=1ma, vin=3v 4.875 5.000 5.125 v input voltage vin 0.9 6.0 v starting voltage vst iout=1ma 1.1 v holding voltage vhold iout=1ma 0.7 v current consumption 1 iss1 vout = vout (t)0.95, ext: no-load 20 45 a current consumption 2 iss2 vout=vout(t)+0.5v 2 5 a on-resistance of ext "high" rexth vout=vout(t)0.95, vext = vout-0.4v 33 59 on-resistance of ext "low" rextl vout=vout(t)0.95, vext = 0.4v 24 45 oscillating frequency fosc vout = vout (t)0.95 80 100 120 khz duty ratio duty vout=vout(t)0.95 67 75 83 % fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c ELM91503xa * vout: input voltage to out pin; vout(t): typ. value of vout. marking a b c d sot-89 ? sot-89, sot-23 package : ELM91xx1xa ELM91xx3xa b a c d sot-23 a to c : assembly lot no. a to z (i, o, x excepted) and 0 to 9 ? sc-70-5 package : ELM91xxxca a b c sc-70-5 a to d : assembly lot no. a to z (i, o, x excepted) and 0 to 9 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
6 rev.1.1 external parts 1) coil 2) diode to design dc/dc converters using ELM91xx1xa series, coil, diode, and capacitor are necessary. except these external parts, switching transistor is also needed when using ELM91xx3xa. please locate external parts to ic as close as possible, and lower the impedance of ground line. (please refer to standard circuit) when choosing choke coil, please select that whose core is not magnetically saturated, dc resistance is low, and which has suf?cient margin for rated current. the typical characteristics graphics of ELM91xx1xa series is done by following coil : slf7045(tdk) the typical characteristics graphics of ELM91xx3xa series is done by following coil : slf10145(tdk) when choosing diode, please select that whose forward voltage is small, switching speed is high and which has suf?cient margin for rated current. for ELM91 series, elm recommends schottoky diodes. 3) capacitor when choosing capacitor, please select that which is generally used for smoothing power supply circuit, with comparatively large capacity and whose rated voltage is at least three times larger than rated output voltage of used ELM91 series. for ELM91 series, elm recommends aluminum electrolytic or tantalum capacitor. under different conditions, such as different input voltage, load current, etc. larger output voltage ripple may happen and thus result in intermittent switching. to prevent output voltage ripple from becoming larger, please use capacitor with comparatively larger capacity or small esr. the output voltage of ELM91xx3xa may lower when the load current is large. to prevent this, please use output capacitor with comparatively large capacity or small esr. following characteristics graphics are made with ELM91303xa, when vin=1.5v.{cin=100 f(ta), l=33 h} 0 100 200 300 400 500 600 700 800 1 1.5 2 2.5 3 3.5 100 ? f(ta) 330 ? f(ta) vout-iout iout (ma) vout (v) 1000 ? f(al) 200 400 600 800 1000 0 100 200 300 400 500 600 100 ? f(ta) 1000 ? f(al) ripple voltage-iout iout (ma) ripple voltage (mv) 330 ? f(ta) 0 100 200 300 400 500 600 700 800 40 50 60 70 80 90 100 100 ? f(ta) 1000 ? f(al) efficiency-iout iout (ma) efficiency (%) 330 ? f(ta) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
7 rev.1.1 0 0.5 1 1.5 2 0.5 1 1.5 2 2.5 vin (v) v out (v) iout=1ma iout=10ma iout=40ma v out-vin 0.1 1 10 100 1000 0.5 1 1.5 2 2.5 iout (ma) v out (v) vin=0.9v 1.1v 1.3v vout-iout 1.5v 0.1 1 10 100 1000 40 50 60 70 80 90 100 i out (ma) efficiency(%) vin=0.9v 1.1v 1.3v efficiency-i out 1.5v 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 iout (ma) ripple voltage(mv) vin=0.9v 1.1v 1.3v ripple voltage-iout 1.5v typical characteristics (ELM91xx1xa) ? ELM91181xa(l=100h, cin=cout=47f, d=ma2z748, top=25c) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
8 rev.1.1 0 100 200 300 400 500 600 700 800 900 1 .75 1 .8 1 .85 1 .9 1 .95 2 time( ? s) output voltage(v) load transient response output voltage output current 50ma 1ma 0 100 200 300 400 500 600 700 800 900 1.75 1.8 1.85 1.9 1.95 2 time( ? s) output voltage(v) load transient response output voltage output current 50ma 1ma 0 3 6 9 12 15 0.5 0.6 0.7 0.8 0.9 1 1.1 i out (ma) v st (v) vst-i out 0 3 6 9 12 15 0 100 200 300 400 500 600 700 800 900 iout (ma) v hold (mv) vhold-iout 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
9 rev.1.1 0 0.5 1 1.5 2 2.5 3 0.5 1 1.5 2 2.5 3 3.5 vin (v) v out (v) iout=1ma iout=10ma iout=40ma v out-vin 0.1 1 10 100 1000 1.5 2 2.5 3 3.5 iout (ma) v out (v) vin=0.9v 1.1v 1.8v vout-iout 1.5v 2.4v 0.1 1 10 100 1000 40 50 60 70 80 90 100 i out (ma) efficiency(%) vin=0.9v 1.1v 1.8v efficiency-i out 1.5v 2.4v 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 iout(ma) ripple voltage(mv) vin=0.9v 1.1v 1.8v ripple voltage-iout 1.5v 2.4v ? ELM91301xa(l=100h, cin=cout=47f, d=ma2z748, top=25c) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
10 rev.1.1 0 100 200 300 400 500 600 700 800 900 2.95 3 3.05 3.1 3.15 3.2 output voltage(v) load transient response time( ? s) output voltage output current 50ma 1ma 0 100 200 300 400 500 600 700 800 900 2.95 3 3.05 3.1 3.15 3.2 time( ? s) output voltage(v) load transient response output current 50ma 1ma output voltage 0 3 6 9 12 15 0.5 0.6 0.7 0.8 0.9 1 1.1 i out (ma) v st (v) vst-i out 0 3 6 9 12 15 0 100 200 300 400 500 600 700 800 900 iout(ma) v hold (mv) vhold-iout 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
11 rev.1.1 0 0.5 1 1.5 2 2.5 3 0.5 1 1.5 2 2.5 3 3.5 4 vin (v) v out (v) iout=1ma iout=10ma iout=40ma v out-vin 0.1 1 10 100 1000 1.5 2 2.5 3 3.5 4 iout (ma) v out (v) vin=0.9v 1.1v 1.8v vout-iout 1.5v 2.4v 0.1 1 10 100 1000 40 50 60 70 80 90 100 i out (ma) efficiency(%) vin=0.9v 1.1v 1.8v efficiency-i out 1.5v 2.4v 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 iout (ma) ripple voltage(mv) vin=0.9v 1.1v 1.8v ripple voltage-iout 1.5v 2.4v ? ELM91331xa(l=100h, cin=cout=47f, d=ma2z748, top=25c) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
12 rev.1.1 0 100 200 300 400 500 600 700 800 900 3.25 3.3 3.35 3.4 3.45 3.5 output voltage(v) time( ? s) output voltage load transient response output current 50ma 1ma 0 100 200 300 400 500 600 700 800 900 3.25 3.3 3.35 3.4 3.45 3.5 time( ? s) output voltage(v) load transient response output voltage output current 50ma 1ma 0 3 6 9 12 15 0.5 0.6 0.7 0.8 0.9 1 1.1 i out (ma) v st (v) vst-i out 0 3 6 9 12 15 0 100 200 300 400 500 600 700 800 900 1000 iout (ma) v hold (mv) vhold-iout 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
13 rev.1.1 0 0.5 1 1.5 2 2.5 3 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 vin (v) v out (v) iout=1ma iout=10ma iout=40ma v out-vin 0.1 1 10 100 1000 3 3.5 4 4.5 5 5.5 iout (ma) v out (v) vin=0.9v 1.1v 1.8v vout-iout 1.5v 3.0v 0.1 1 10 100 1000 40 50 60 70 80 90 100 i out (ma) efficiency(%) vin=0.9v 1.1v 1.8v efficiency-i out 1.5v 3.0v 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 iout (ma) ripple voltage(mv) vin=0.9v 1.1v 1.8v ripple voltage-iout 1.5v 3.0v ? ELM91501xa(l=100h, cin=cout=47f, d=ma2z748, top=25c) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
14 rev.1.1 0 100 200 300 400 500 600 700 800 900 4.95 5 5.05 5.1 5.15 5.2 output voltage(v) load transient response time( ? s) output voltage 0 100 200 300 400 500 600 700 800 900 4.95 5 5.05 5.1 5.15 5.2 time( ? s) output voltage(v) load transient response output voltage output current 50ma 1ma 0 3 6 9 12 15 0.5 0.6 0.7 0.8 0.9 1 1.1 i out (ma) v st (v) vst-i out 0 3 6 9 12 15 200 400 600 800 1000 1200 1400 1600 1800 2000 iout (ma) v hold (mv) vhold-iout 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
15 rev.1.1 ? ELM91183xa (fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c) ?? 0 0.5 1 1.5 2 0.5 1 1.5 2 2.5 iout=300ma iout=100ma iout=10ma vout-vin vin (v) vout (v) ? ????????????? ??????????????????????????????????????????????????????????????? ???? ? ??????????? ??????????????????????????????????????????????? 0.1 1 10 100 1000 0.5 1 1.5 2 2.5 vin=0.9v vin=1.1v vin=1.5v vout-iout vout (v) vin=1.3v 0.1 1 10 100 1000 40 50 60 70 80 90 100 vin=0.9v vin=1.1v vin=1.5v efficiency-iout iout (ma) efficiency (%) vin=1.3v 0 200 400 600 800 1000 0 100 200 300 400 500 600 700 800 vin=0.9v vin=1.1v vin=1.5v ripple voltage-iout iout (ma) ripple voltage (mv) vin=1.3v typical characteristics (ELM91xx3xa) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
16 rev.1.1 ?? 0 200 400 600 800 1000 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 vout load transient response time ( ?s) vout (v) iout 1ma 100ma vin=1.2v ??????????? ??????????????????????????????????????????????? 0 200 400 600 800 1000 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 vout load transient response time ( ?s) vout (v) iout 1ma 100ma vin=1.2v 0 20 40 60 80 100 0.8 0.9 1 1.1 1.2 1.3 vst-iout iout (ma) vst (v) 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 vhold-iout iout (ma) vhold (v) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
17 rev.1.1 ? ELM91303xa (fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c) ?? 0 0.5 1 1.5 2 2.5 3 1 1.5 2 2.5 3 3.5 iout=300ma iout=100ma iout=10ma vout-vin vin (v) vout (v) ? ????????????? ??????????????????????????????????????????????????????????????? ???? ? ??????????? ??????????????????????????????????????????????? 0.1 1 10 100 1000 1 1.5 2 2.5 3 3.5 vin=0.9v vin=1.1v vin=2.4v vout-iout vout (v) vin=1.5v vin=1.8v 0.1 1 10 100 1000 40 50 60 70 80 90 100 vin=0.9v vin=1.1v vin=2.4v efficiency-iout iout (ma) efficiency (%) vin=1.5v vin=1.8v 200 400 600 800 1000 0 100 200 300 400 500 600 700 800 vin=0.9v vin=1.1v vin=2.4v ripple voltage-iout iout (ma) ripple voltage (mv) vin=1.5v vin=1.8v 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
18 rev.1.1 ?? ??????????? ??????????????????????????????????????????????? 0 200 400 600 800 1000 2.7 2.75 2.8 2.85 2.9 2.95 3 3.05 3.1 3.15 vout load transient response time ( ?s) vout (v) iout 1ma 100ma vin=1.5v 0 200 400 600 800 1000 2.7 2.75 2.8 2.85 2.9 2.95 3 3.05 3.1 3.15 vout load transient response vout (v) iout 1ma 100ma vin=1.5v 0 20 40 60 80 100 0.8 0.9 1 1.1 1.2 1.3 vst-iout iout (ma) vst (v) 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 vhold-iout iout (ma) vhold (v) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
19 rev.1.1 ? ELM91333xa (fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c) ?? 0 0.5 1 1.5 2 2.5 3 3.5 1 1.5 2 2.5 3 3.5 4 iout=300ma iout=100ma iout=10ma vout-vin vin (v) vout (v) ? ????????????? ??????????????????????????????????????????????????????????????? ???? ? ??????????? ??????????????????????????????????????????????? 0.1 1 10 100 1000 1.5 2 2.5 3 3.5 4 vin=0.9v vin=1.1v vin=2.4v vout-iout vout (v) vin=1.5v vin=1.8v 0.1 1 10 100 1000 40 50 60 70 80 90 100 vin=0.9v vin=1.1v vin=2.4v efficiency-iout iout (ma) efficiency (%) vin=1.5v vin=1.8v 0 200 400 600 800 1000 0 100 200 300 400 500 600 700 800 vin=0.9v vin=1.1v vin=2.4v ripple voltage-iout iout (ma) ripple voltage (mv) vin=1.5v vin=1.8v 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
20 rev.1.1 ?? ??????????? ??????????????????????????????????????????????? 0 200 400 600 800 1000 3 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 vout load transient response time ( ?s) vout (v) iout 1ma 100ma vin=1.5v 0 200 400 600 800 1000 3 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 vout load transient response vout (v) iout 1ma 100ma vin=1.5v 0 20 40 60 80 100 0.8 0.9 1 1.1 1.2 1.3 vst-iout iout (ma) vst (v) 0 20 40 60 80 100 0 0.2 0.4 0.6 0.8 1 1.2 vhold-iout iout (ma) vhold (v) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
21 rev.1.1 ? ELM91503xa (fet=elm37400fa, l=33h, cin=cout=100f, d=ma735, vss=0v, top=25c) ?? 0 1 2 3 4 5 2.5 3 3.5 4 4.5 5 5.5 iout=300ma iout=100ma iout=10ma vout-vin vin ( v ) vout (v) ? ????????????? ??????????????????????????????????????????????????????????????? ???? ? ??????????? ??????????????????????????????????????????????? 0.1 1 10 100 1000 3 3.5 4 4.5 5 5.5 vin=0.9v vin=1.1v vin=3.0v vout-iout vout (v) vin=1.5v vin=1.8v 0.1 1 10 100 1000 40 50 60 70 80 90 100 vin=0.9v vin=1.1v vin=3.0v efficiency-iout iout (ma) efficiency (%) vin=1.5v vin=1.8v 0 200 400 600 800 1000 0 100 200 300 400 500 600 vin=0.9v vin=1.1v vin=3.0v ripple voltage-iout iout (ma) ripple voltage (mv) vin=1.5v vin=1.8v 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller
22 rev.1.1 ?? ??????????? ??????????????????????????????????????????????? 0 200 400 600 800 1000 4.7 4.75 4.8 4.85 4.9 4.95 5 5.05 5.1 5.15 vout load transient response time ( ?s) vout (v) iout 1ma 100ma vin=2.4v 0 200 400 600 800 1000 4.7 4.75 4.8 4.85 4.9 4.95 5 5.05 5.1 5.15 vout load transient response vout (v) iout 1ma 100ma vin=2.4v 0 20 40 60 80 100 0.8 0.9 1 1.1 1.2 1.3 vst-iout iout (ma) vst (v) 0 20 40 60 80 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 vhold-iout iout (ma) vhold (v) 22 - ELM91xxxxa cmos pfm step-up dc/dc converter and controller

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