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1 elm91 x x x xa cmos pfm step-up dc/dc converter and controller g e neral description parameter symbol limit unit apply voltage to l x 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 l x pin ilx 5 00 ma output current of e x t pin iext 20 ma power dissipation pd 500 (sot - 89) mw 250 (sot - 23) 150 (sc - 70) 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. 40 w ( elm91301xa : typ.100khz) ? high ef fi ciency : 85% ( elm9130xxa: vin =1.5v, iout =10ma) ? output current(e.g.) : 100ma ( vin = 1.5v, vout =3.0v) ? package : sot - 8 9, sot - 23 , sc - 70(sot-323) ? constant voltage source for battery- operated devices ? portable communication equipments and video recorders elm91xxx xa - 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 s witching transistor 1 : internal switch 3 : external switch d package a : sot - 89 b : sot - 23 c : sc - 70 (sot-323) e p roduct version a f taping direction s , n: ref er to pkg file elm91 x x x x a - x a b c d e f f eatures maximum a bsolute ratings selection guide applica tion 2 2 - 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 sot - 89 ( top view) 1 2 3 1 3 2 1 2 3 sot - 23 (top view) s c - 70 (top view) elm91xx1aa, e lm91xx3aa elm91xx1ba, e lm91xx3ba elm91xx1ca, e lm91xx3ca pin no. pin name 1 v ss 2 vout 3 elm91xx1aa: lx elm91xx3aa: ext pin no. pin name 1 v ss 2 elm91xx1ba: lx elm91xx3ba: ext 3 vout pin no. pin name 1 v ss 2 elm91xx1ca: lx elm91xx3ca: ext 3 vout pin configuration s tandard circuit elm91 x x x xa 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 4 7 f ? 4 7 f ? 1 0 0 h ? + 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 1 0 0 f ? c o u t 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 2 2 -
3 l =100 h, cin = cout =47 f, d=ma2z748, vss = 0v, top = 25 c parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 1.5v 1.755 1.800 1.845 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 0.9 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95 10 25 a current consumption 2 iss 2 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 = 6 v 1 a oscillating frequency fosc vout = vout (t) 0.95 80 100 120 k hz 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. 2 2 - parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 1.5v 3.218 3.300 3.382 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 0.9 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95 15 35 a current consumption 2 iss 2 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 = vl x = 6 v 1 a oscillating frequency fosc vout = vout (t) 0.95 80 100 120 k hz voltage limit of lx pin ( lx switch on) v lxlim vout = vout (t) 0.95 0.5 0.7 0.9 v duty ratio duty vout = vout (t) 0.95 67 75 83 % l =100 h, cin = cout =47 f, d=ma2z748, vss = 0v, top = 25 c elm91331xa * vout : input voltage to out pin ; vout (t) : typ. value of vout. parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 1.5v 2.925 3.000 3.075 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 0.9 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95 14 35 a current consumption 2 iss 2 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 = 6 v 1 a oscillating frequency f osc vout = vout (t) 0.95 80 100 120 k hz voltage limit of lx pin ( lx switch on) v lxlim vout = vout (t) 0.95 0.5 0.7 0.9 v duty ratio duty vout = vout (t) 0.95 67 75 83 % l =100 h, cin = cout =47 f, d=ma2z748, vss = 0v, top = 25 c elm91301xa * vout : input voltage to out pin ; vout (t) : typ. value of vout. elm91 x x x xa cmos pfm step-up dc/dc converter and controller
4 parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 3 v 4.875 5.000 5.125 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 0.9 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95 20 45 a current consumption 2 iss 2 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 = 6 v 1 a oscillating frequency fosc vout = vout (t) 0.95 80 100 120 k hz voltage limit of lx pin ( lx switch on) v lxlim vout = vout (t) 0.95 0.5 0.7 0.9 v duty ratio duty vout = vout (t) 0.95 67 75 83 % l =100 h, cin = cout =47 f, d=ma2z748, vss = 0v, top = 25 c elm91501xa * vout : input voltage to out pin ; vout (t) : typ. value of vout. parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 1.5v 1.755 1.800 1.845 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 1.1 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95, ext: no-load 10 25 a current consumption 2 iss 2 vout = vout (t) + 0.5v 2 5 a on-resistance of ext high rexth vout = vout (t) 0.95, vext = vout - 0.4v 9 0 17 0 on-resistance of ext low r ext l vout = vout (t) 0.95, vext = 0.4v 7 0 1 20 oscillating frequency fosc vout = vout (t) 0.95 80 100 120 k hz duty ratio duty vout = vout (t) 0.95 67 75 83 % fet =elm37400fa, l = 33 h, cin = cout = 100 f, d=ma735, vss = 0v, top = 25 c elm91183xa parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 1.5v 2.925 3.000 3.075 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 1.1 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95, ext: no-load 14 35 a current consumption 2 iss 2 vout = vout (t) + 0.5v 2 5 a on-resistance of ext high r exth vout = vout (t) 0.95, ve xt = vout - 0.4v 50 86 on-resistance of ext low" r ext l vout = vout (t) 0.95, ve xt = 0.4v 36 6 0 oscillating frequency f osc vout = vout (t) 0.95 80 100 120 k hz duty ratio duty vout = vout (t) 0.95 67 75 83 % fet =elm37400fa, l = 33 h, cin = cout = 100 f, d=ma735, vss = 0v, top = 25 c 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) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
5 parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 1.5v 3.218 3.300 3.382 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 1.1 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 iss 1 vout = vout (t) 0.95, ext: no-load 15 35 a current consumption 2 iss 2 vout = vout (t) + 0.5v 2 5 a on-resistance of ext high r exth v out = vout (t) 0.95, vext = vout - 0.4v 46 83 on-resistance of ext low r ext l vout = vout (t) 0.95, vext = 0.4v 33 55 oscillating frequency f osc vout = vout (t) 0.95 80 100 120 k hz duty ratio duty vout = vout (t) 0.95 67 75 83 % fet =elm37400fa, l = 33 h, cin = cout = 100 f, d=ma735, vss = 0v, top = 25 c elm91333xa * vout : input voltage to out pin ; vout (t) : typ. value of vout. parameter symbol condition min. typ. max. unit output voltage vout iout = 1 ma, vin = 3 v 4.875 5.000 5.125 v input voltage vin 0.9 6.0 v starting voltage vst iout =1 ma 1.1 v holding voltage v hold iout =1 ma 0.7 v current consumption 1 i ss 1 vout = vout (t) 0.95, ext: no-load 20 45 a current consumption 2 i ss 2 vout = vout (t) + 0.5v 2 5 a on-resistance of ext "high" r exth vout = vout (t) 0.95, vext = vout - 0.4v 33 59 on-resistance of ext "low" r ext l vout = vout (t) 0.95, vext = 0.4v 24 45 oscillating frequency f osc vout = vout (t) 0.95 80 100 120 k hz duty ratio duty vout = vout (t) 0.95 67 75 83 % fet =elm37400fa, l = 33 h, cin = cout = 100 f, d=ma735, vss = 0v, top = 25 c elm91503xa * vout : input voltage to out pin ; vout (t) : typ. value of vout. marking a b c d s o t - 89 ? sot - 89, sot - 23 package : elm91xx1xa elm91 xx3xa b a c d s o t - 23 a to c : assembly lot no. a to z (i, o, x ex cepted) and 0 to 9 ? s c - 70 package : elm91xx1ca elm91xx3ca a b c s c - 70 a to d : assembly lot no. a to z (i, o, x ex cepted) and 0 to 9 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
6 external parts 1) c oil 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 cho osing 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 di fferent conditions, such as different in put 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. f ollowing characteristics graphics are made with elm91 303xa, 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) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
7 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 c haracteristics (elm91xx1xa) ? elm91 181x a ( l =100 h, cin = cout =47 f, d=ma2z748, top = 25c) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
8 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
9 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 ? elm91 301xa( l =100 h, cin = cout =47 f, d=ma2z748, top = 25c) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
10 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
11 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 ? elm91 33 1 xa( l =100 h, cin = cout =47 f, d=ma2z748, top = 25c) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
12 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
13 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 ? elm91 501x a( l =100 h, cin = cout =47 f, d=ma2z748, top = 25c) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
14 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
15 ? elm91 18 3 x a (fet=elm37400fa, l = 33 h, cin = cout = 100 f, 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 c haracteristics (elm91xx3xa) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
16 ?? 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) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
17 ? elm91 30 3 x a (fet=elm37400fa, l = 33 h, cin = cout = 100 f, 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
18 ?? ??????????? ??????????????????????????????????????????????? 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) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
19 ? elm91 33 3 x a (fet=elm37400fa, l = 33 h, cin = cout = 100 f, 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
20 ?? ??????????? ??????????????????????????????????????????????? 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) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
21 ? elm91 50 3 x a (fet=elm37400fa, l = 33 h, cin = cout = 100 f, 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 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller
22 ?? ??????????? ??????????????????????????????????????????????? 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) 2 2 - elm91 x x x xa cmos pfm step-up dc/dc converter and controller

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