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description gm34063 has all the functions required for dc-to-dc converters: an internal temperature- compensated ref- erence, comparator, controlled duty cycle oscillator with an active current limit circuit, driver, and high- current output switch. gm34063 is designed for step-down, step-up and volt- age-inverting applications by using a minimum number of external components. cd-rom motherboards smps power supply application features 3.0v to 40v input adjustable output v oltage current limiting output switch current to 1.5a low standby current operating frequency to 100khz precision 2% reference 1 2 3 4 5 6 7 8 switch collector switch emitter timing capacitor gnd driver collector i sense pk v cc comparator inverting input i oscillator pk comparator s q r c t 1.25v reference regulator q1 q2 + - schematic diagram battery chargers dsl modem g m 3 4 0 6 3 v 0 . 1 www.gammamicro.com 1 (bottom view) 100 a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
a : assembl y location y : y ear w w : weekly operation ambient t emperature range package shipping sop-8 2,500 /t ape &reel units GM34063S8R ordering number dip-8 sop-8 gm34063d8t gm34063s8t 0 to 70c 0 to 70 c 0 to 70c 60 units/ tube 100 / tube units sop-8 8 7 6 5 4 3 2 1 i sense pk driver collector v cc comparator inventing input switch collector switch emitter timing capacitor gnd dip - 8 8 7 6 5 4 3 2 1 i sense pk driver collector v cc comparator inventing input switch collector switch emitter marking information & pin configura tions (top view) ordering information gm34063 ayww gm34063 ayww g m 3 4 0 6 3 2 timing capacitor gnd * for detail ordering number identification, please see last page. a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
absolute maximum ratings p ara met er sym bol v alu e uni t 40 vdc com para tor in put v oltag e ra nge -0.3 to + 4 0 vdc switc h co llecto r v oltag e switc h em itter v oltag e (v = 40 v) pin1 switc h co llecto r to e mitte r v oltag e drive r col lecto r v oltag e drive r col lecto r cur rent( note 1) switc h cu rrent powe r dis sipat ion a nd t herm al ch aract eristi cs pl astic pac kage , d s uffix t = 25 c a th erma l res istan ce so ic pa ckag e, s suff ix t = 25 c a th erma l res istan ce 40 40 40 40 100 1.5 vdc vdc ma a powe r sup ply v oltag e oper ating junc tion t empe ratur e +150 0 to + 70 -40 t o +12 5 c c stora ge t empe ratur e ran ge -65 t o +15 0 c v cc v ir v c(swit ch) v e(swit ch) v ce(sw itch) v c(drive r) i c(drive r) i sw p d r q ja p d r q ja t j t a t stg 1.25 100 625 160 w c/w mw c/w note 1. maximum package power dissipation limits must be observed g m 3 4 0 6 3 3 vdc oper ating amb ient t empe ratur e rang e gm3 4063 gm3 4063 e vdc a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
electrical characteristics (v = 5.0 v, t = t to thigh unless otherwise specified) cc a iow characteristics min symbol typ max unit frequency (v = 0 v, c = 1.0nf, t = 25c) t pin5 a charge current (v = 5.0v to 40v, t = 25c) cc a discharge current (v = 5.0v to 40v, t = 25 cc a c) discharge to charge current ration (pin 7 to v t = cc a 25c) current limit sense voltage ( i = i , t = 25c ) chg dischg a oscillator 24 f osc 24 140 5.2 250 i chg i dischg i / dischg i chg v ipk(sense) 33 35 220 6.5 300 khz a a - mv 42 42 260 7.5 350 output switch (note 2) saturation voltage, darlington connection (i = 1.0a, pins 1, 8 connected) sw supply current (v = 5.0v to 40 v, c = 1.0 nf, pin 7 = v t cc cc v > v pin 2 = gnd remaining pins open) pin5 th - - - v ce(sat) v ce(sat) i cc 1.0 0.45 - v v ma 1.3 0.7 4.0 dc current gain (i = 1.0 a, v = 5.0 v, t = 25c) sw ec a 50 h fe 75 - - collector off - state current (v = 40 v) ce - i c(off) 40 100 a compara tor threshold voltage t = 25c a t = t to t a iow high 1.225 1.210 v th 1.25 - v 1.275 1.29 threshold voltage line regulation (v = 3.0v to 40v) cc input bias current (v = 0v) in - - reg line i ib 1.4 -20 5.0 -400 mv na total device note 2. low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. note 3. if the output switch is driven into hard saturation (non-arlington configuration) at low switch currents ( 300 ma) and high driver currents ( 30 ma), it may take up to 2.0 ms for it to come out of saturation. this condition will shorten the off time at frequencies 30 khz, and is magnified at high temperatures. this condition does not occur with a darlington configuration, since the output switch cannot saturate. if a non-darlington configuration is used, the following output drive condition is recommended: forced b of output switch : * the 100 w resistor in the emitter of the driver device requires about 7.0 ma before the output switch conducts. i o u tp u t c i d ri v e r - 7 .0 m a * c 1 0 g m 3 4 0 6 3 4 saturation voltage (note 3) (i = 1.0 a, r = 82 w to v , forced b 20) sw pins 8 cc a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 i emitter current (a) e v s a t u r a t i o n v o l t a g e ( v ) c e v = 5v cc pin1, 7, 8 =v cc pin 3, 5 = gnd t = 25c a figure 1:emitter follows configuration output 3.6 3.2 2.8 2.4 2 1.6 1.2 0.8 0.4 0 0 5 10 15 20 25 30 35 40 figure 2: standley supply current versus supply voltage v , supply voltage (v) cc i , s u p p l y c u r r e n t ( m a ) c c c = 1.0 nf t pin 7 = v cc pin 2 = gnd 1000 950 900 850 800 750 -40 0 40 80 120 t (c) j v ce(sat) (mv) figure 4: darlington configuration collector emitter saturation voltage (v ) ce(sat) vs temperature 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 darlington connection v = 5v cc pin 7 = v cc pins 2, 3, 5 = gnd t = 25c a figure 3: common emitter configuration output switch saturation voltage versus collector current i , collector current(a) c v , s a t u r a t i o n v o l t a g e ( v ) e c ( s a t ) v = 5v cc i = 1a c g m 3 4 0 6 3 5 typical performance characteristics 1000 500 200 100 50 20 10 5.0 2.0 0 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 v = 5.0v cc pin 7 = v cc pin 5 = gnd t = 25c a t on t off c , oscillator timing capacitor(nf) t t , o u t p u t s w i t c h o n - o f f t i m e ( s ) o n - o f f figure 6: output switch on- off time versus oscillator timing capacitor 400 380 360 340 320 300 280 260 240 220 200 -55 -25 0 25 50 75 100 125 t , ambient temperature(c) a v , c u r r e n t l i m i t s e n s e v o l t a g e ( v ) i p k ( s e n s e ) figure 5: current limit sense voltage versus temperature v = 5.0v cc i = i chg dischg a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
step - up converter t est load reg ulatio n outp ut ri pple effic iency outp ut ri pple with opti onal fitter line regu lation con ditio ns res ults v = 8.0 v to 16 v, i = 175 ma in o v = 12 v, i = 75ma to 175 ma in o v in = 12 v, i =175 ma o v in = 12 v, i = 175 ma o v in = 12 v, i = 175 ma o 30 mv = 0.05% 10mv = 0.017% 400 mvpp 87.7% 40 mvpp figure 7. external current boost connections for i peak greater than 1.5a c v in 12 v r sc 0.22 + 100 180 8 7 6 5 r2 47k 2.2k r1 170 h 1 2 3 4 s r q q2 q1 i pk c t osc. v cc + - comp. 1.25v reference regulator c t 1500pf 1n5819 l 330 c o + v out 28 v / 175 ma 1.0 h v out optional filter + 100 g m 3 4 0 6 3 6 100 a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
external current boost connections for i peak greater than 1.5a c 8 7 6 i oscillator pk c t comparator + - s q r q2 q1 1 2 1.25v reference regulator figure 6a. external npn switch v in r sc 8 7 6 i oscillator pk c t comparator + - s q r q2 q1 100 1 2 1.25v reference regulator r 0 for constant v in if the output switch is driven into hard saturation (non-darlington configuration) at low switch currents ( 300 ma) and high driver currents ( 30 ma), it may take up to 2.0 ms to come out of saturation. this condition will shorten the off time at frequencies 30 khz, and is magnified at high temperatures. this condition does not occure with a darlington configuration, since the output switch cannot saturate. if a non-darlington configuration is used, the following output drive condition is recommended. figure 6b. external npn switch g m 3 4 0 6 3 7 5 3 4 5 3 4 v out v out v in r sc a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
t est load reg ulatio n outp ut rip ple shor t circ uit cu rrent outp ut rip ple w ith o ption al fit ter line regu lation con ditio ns res ults v = 15 v to 25 v, i = 500 ma in o vi in o = 25 v, = 75ma to 500 ma vi in o = 25 v, =500 ma vr in l = 25 v, = 0.1 w vi in o = 25 v, = 500 ma vi in o = 25 v, = 500 ma 12 mv = 0.15% 3.5mv = 0.03% 120 mvpp 1.1 a 83.7% 40 mvpp step - down converter effic iency figure 8. external current buck connections for i peak greater than 1.5a c v in 25 v r sc 0.33 + 100 8 7 6 5 r2 3.6k 1.2k r1 1 2 3 4 s r q q2 q1 i pk c t osc. v cc + - comp. 1.25v reference regulator c t 470pf 1n5819 470 c o + v out 5.0 v / 500 ma 1.0 h v out optional filter + 100 220 h g m 3 4 0 6 3 8 100 l a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
external current buck connections for i peak greater than 1.5a c figure 7a. external npn switch v in r sc 8 7 6 i oscillator pk c t comparator + - 1 2 3 s r q q2 q1 1.25v reference regulator v out figure 7b. external npn switch v in r sc 8 7 6 i oscillator pk c t + - comparator 1.25v reference regulator s r q q2 q1 1 2 3 v out g m 3 4 0 6 3 9 5 4 a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
t est load reg ulatio n outp ut rip ple shor t circ uit cu rrent outp ut rip ple w ith o ption al fit ter line regu lation con ditio ns res ults v = 4.5 v to 6.0 v, i = 100 ma in o vi in o = 5.0 v, = 10ma to 100 ma vi in o = 5.0 v, =100 ma v in = 5.0 v, r = 0.1 w l vi in o = 5.0 v, = 100 ma vi in o = 5.0 v, = 100 ma 3.0 mv = 0.012% 0.022mv = 0.09% 500 mvpp 910ma 62.2% 70 mvpp effic iency v oltage inverting converter figure 9. external current boost connections for i peak greater than 1.5a c v in 4.5v to 6.0v r sc 0.24 + 100 8 7 6 5 r1 953 8.2k r2 1 2 3 4 s r q q2 q1 i pk c t osc. v cc + - comp. 1.25v reference regulator + 1500 pf 1n5819 1000f c o + v out -12 v / 100 ma 1.0 h v out optional filter 100 g m 3 4 0 6 3 10 100 88h l + a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
external current boost connections for i peak greater than 1.5a c figure 8a. external npn switch v in r sc 8 7 6 i oscillator pk c t comparator + - 1 2 3 s r q q2 q1 1.25v reference regulator v out v in r sc 8 7 6 i oscillator pk c t s r q 1 2 3 q2 q1 comparator + - 1.25v reference regulator v out figure 8b. external npn switch g m 3 4 0 6 3 11 5 4 4 5 a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
g m 3 4 0 6 3 12 v in r sc 8 7 6 i oscillator pk c t comparator + - 1 2 3 s r q q2 q1 1.25v reference regulator 5 4 figure 9. dual output voltage +12v gnd -12v v in r sc 8 7 6 i oscillator pk c t comparator + - 1 2 3 s r q q2 q1 1.25v reference regulator 5 4 figure 10. higher output power, higher input v oltage v out + + -v out isolated form input + + a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
g m 3 4 0 6 3 13 design formulas calculation step - up step - down voltage - inverting t / t on off (t + t ) on off v + v - v out f in(min) v - v in(min) sat v + v out f v - v in(min) sat -v out iv i + v out f v - v in sat 1 f t off t + t on off t on t off + 1 t on (t + t ) - on off t on c t -5 4.0 x 10 t on i pk(switch) c o 2 i ( ) out(max) t on t off + 1 2 i out(max) r sc 0.3/ i pk(switch) l (min) (v - v ) in(min) sat i pk(switch) ( ) t on(max) 9 it out on v npple(pp) i (t + t ) pk(switch) on off 8v ripple(pp) v = saturation voltage of the output switch. sat v = forward voltage drop of the output rectifier. f v - nominal input voltage. in v - desired output voltage, out i - desired output current. out f - minimum desired output switching frequency at the selected values of v and i . min in o v - desired peak-to peak output ripple voltage. in practice, the calculated capacitor value will need to be increased due to its ripple(pp) equivalent series resistance and board layout. the ripple voltage should be kept to a low value since it will directly affect the line and load regulation. 1 f 1 f (t + t ) - on off t on 2 i ( ) out(max) t on t off + 1 9 it out on v ripple(pp) -5 4.0 x 10 t on 0.3/ i pk(switch) (v - v ) in(min) out v- sat i pk(switch) ( ) t on(max) t + t on off t on t off + 1 t + t on off t on t off + 1 (t + t ) - on off t on -5 4.0 x 10 t on 0.3/ i pk(switch) (v - v ) in(min) sat i pk(switch) ( ) t on(max) a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
g m 3 4 0 6 3 14 a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit 0.275 7.0 0.155 4.0 0.060 1.52 0.050 1.270 0.024 0.6 inches mm ( ) pad layout sop-8 p ackage outline dimensions 0.236 0.008 0.050 nom 1.270 nom +0.21 -0.20 5.990 3.91 0.1 +0.003 -0.004 0.154 pin indent 1.600 0.130 0.063 0.005 0.057 nom 1.450 nom 0.175 0.075 0.007 0.003 +0.004 -0.003 0.016 +0.10 -0.08 0.410 +0.0018 -0.0005 0.008 +0.05 -0.01 0.200 +0.013 -0.022 0.028 +0.33 -0.56 0.710 +0.002 -0.004 0.191 +0.05 -0.10 4.850 inches mm ( ) 0 ~ 8 dip-8 p ackage outline dimensions 0.015 min 0.380 min 0.26 0.006 +0.15 -0.16 6.60 0.36 0.01 +0.25 -0.26 9.14 0.180 max 4.570 max 0.125 min 3.180 min +0.002 -0.006 0.13 +0.05 -0.15 3.30 0.018 0.004 0.46 0.10 0.039 0.07 0.99 0.18 0.06 0.01 +0.26 -0.25 1.52 0.100 nom 2.540 nom 0.021 0.005 +0.12 -0.13 0.53 +0.010 -0.015 0.30 +0.25 -0.38 7.62 +0.002 -0.003 0.01 +0.05 -0.08 0.25 0.365 0.02 9.27 0.51 inches mm ( ) power management
g m 3 4 0 6 3 15 ordering number gm 34063 s8 r gamma micro. circuit type package s8: sop-8 d8: dip-8 shipping t : tube r: t ape & reel a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit power management
a a m i c r o e l e c t r o n i c s gm34063 1.5a dc-to-dc converter control circuit g m 3 4 0 6 3 16 power management

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