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dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 1 - htc sop-8 pkg dip-8 pkg ordering information device package mc34063ad mc34063agd mc34063bd sop-8 mc34063an dip-8 features z output switch current in excess of 1.5a z 2% reference accuracy z low quiescent current : 2.5ma(typ.) z operating from 3v to 40v z frequency operation to 100khz z active current limiting z moisture sensitivity level 3d z mc34063ag is halogen free products application z battery chargers z nics / switches / hubs z adsl modems z negative voltage power supplies description the mc34063a/b series is a monolithic control circ uit delivering the main functions for dc-dc voltage converting. the device contains an internal temperat ure compensated reference, comparator, duty cycle controlled oscillator with an acti ve current limit circuit driver and high current output switch. output voltage is adjustable through two extern al resistors with a 2% reference accuracy. employing a minimum number of external components the mc34063a/b devices series is designed for step- down, step-up and voltage-inverting applications. absolute maximum ratings (note 1) characteristic symbol min. max. unit power supply voltage v cc - 50 v comparator input voltage range v ir -0.3 40 v switch collector voltage v swc 40 v switch emitter voltage(v swc =40v) v swe 40 v switch collector to emitter voltage v ce 40 v driver collector voltage v dc - 40 v driver collector current (note 2) i dc - 100 ma switch current i sw - 1.5 a
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 2 - htc absolute maximum ratings (continued) characteristic symbol min. max. unit sop-8 pd max_sop-8 1.250 w power dissipation (at t a = 25c) dip-8 pd max_dip-8 0.625 w sop-8 ja-sop-8 100 c/w thermal resistance dip-8 ja-dip-8 160 c/w operating junction temperature range t j -40 150 c mc34063a 0 75 c operating ambient temperature range mc34063b t aopr -40 85 c storage temperature range t stg -65 150 c note 1. absolute maximum ratings are those values beyond wh ich damage to the device may occur. functional operation under these conditions is not implied. thermal data symbol parameter dip-8 sop-8 unit r thj-amb thermal resistance junction-ambient(*) max 100 160 /w (*) this value depends from thermal design of pcb on which the device is mounted. ordering information operating ambient temperature(t aopr ) range package order no. supplied as status 0 ~70 mc34063ad reel active 0 ~70 mc34063agd reel contact us -40 ~85 sop8 mc34063bd reel active 0 ~70 mc34063an tube active -40 ~85 dip8 mc34063bn tube active package type root name product code mc 34063 d n : sop8 : dip8 temperature range a b : 0 ~70 : -40 ~85 green mode g blank : halogen free : pb free
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 3 - htc pin configuration sop-8 dip-8 pin description sop-8 / dip-8 pkg pin no. name function 1 switch collector internal switch transistor collector 2 switch emitter internal switch transistor emitter 3 timing capacitor timing capacitor to control the switching frequency 4 gnd ground pin for all internal circuits 5 comparator inverting input inverti ng input pin for internal comparator 6 v cc voltage supply 7 i pk sense peak current sense input by monitoring the voltage drop across an external i sense resistor to limit the peak current through the switch 8 driver collector voltage driver collector block diagram 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator driver collector i pk sense v cc comparator inverting input switch collector switch emitter timing capacitor gnd
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 4 - htc electrical characteristics (refer to the test circuits, v cc =5v, t a =t low to t high , unless otherwise specified, see note 2) symbol parameter test conditions min. typ. max. unit oscillator f osc frequency v pin5 =0v, c t =1nf, t a =25 24 33 42 khz i chg charge current v cc =5 to 40v, t a =25 24 35 42 ? i dischg discharge current v cc =5 to 40v, t a =25 140 220 260 ? i dischg /i chg discharge to charge current ratio pin 7= v cc , t a =25 5.2 6.5 7.5 v ipk(sense) current limit sense voltage i chg =i dischg , t a =25 250 300 350 mv output switch v ce(sat) saturation voltage, darlington connection i sw =1a, pins 1,8 conn ected 1.0 1.3 v v ce(sat) saturation voltage i sw =1a, r pin8 =82 ? to v cc , forced ~ 20 0.45 0.7 v h fe dc current gain i sw =1a, v ce =5v, t a =25 50 75 i c(off) collector off-state current v ce = 40v 0.01 100 ? comparator t a =25 1.225 1.25 1.275 v v th threshold voltage t a =t low to t high 1.21 1.29 v reg line threshold voltage line regulation v cc = 3 to 40v 1 5 mv i ib input bias current v in = 0v -5 -400 na total device i cc supply current v cc = 5 to 40v, c t =1nf pin7= v cc , v pin5 >v th , pin2=gnd remaining pins open for mc34063a/b 1.4 4 ma note 1. maximum package power dissipation limit must be observed. note 2. t low = '-30 , t high = '+125 note 3. if darlington configuration is not used, care must be taken to avoid deep saturation of output switch. the resulting switch-off time may be adversely affected. in a darlington configuration the following output driver condition is suggested: forced of output switch : 10 * 7.0m - c(driver) c(output) * currentless due to a built in 1k ? anti-leakage resistor
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 5 - htc typical electrical characteristics emitter follower configuration output saturation voltage vs. emitter current common emitter configuration output switch saturation voltage vs. collector current power collector emitter saturation voltage (v ce(sat) ) vs, temperature output switch on-off time vs. oscillator timing capacitor darlington configuration collector emitter saturation voltage (v ce(sat) ) vs. temperature current limit sense voltage (v ipk ) vs. temperature
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 6 - htc typical electrical characteristics (continued) reference voltage vs. temperature supply current vs. temperature bias current vs. temperature supply current vs. input voltage
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 7 - htc typical application circuit step-up converter step-down converter r sc 0.22 r3 180 c2 100uf r1 2.2k r2 44k c3 1.5nf d1 byv10-40 c1 330uf drc i pk v cc cii swc swe tc gnd l1 170uh 1 2 3 4 8 7 6 5 v in 12v v out 25v / 175ma + + mc34063a/b c2 100uf r1 1.2k r2 3.6k c3 470pf drc i pk v cc cii swc swe tc gnd 1 2 3 4 8 7 6 5 v in 25v v out 5v / 0.5a r sc 0.33 d1 byv10-40 c1 470uf + + l1 220uh
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 8 - htc step-up with external npn switch voltage inverting converter s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc + v in v out c2 100uf r1 8.2ko r2 953o c3 1.5nf drc i pk v cc cii swc swe tc gnd 1 2 3 4 8 7 6 5 v in 4.5v to 5v v out -12v / 100ma r sc 0.22o d1 byv10-40 c1 1000uf + + l1 90uh
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 9 - htc step-down with external npn switch step-down with external pnp switch s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc + v in v out s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc + v in v out
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 10 - htc voltage inverting with external npn switch voltage inverting with external pnp saturated switch s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc v in v out + s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc + v in v out
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 11 - htc dual output voltage s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc v in + + +12v -12v gnd higher output power, higher input voltage s q r q2 i pk oscillator 1.25v reference regulator q1 3 2 4 1 7 6 5 8 + - comparator r sc v in + + + v out - v out isolated from input
dc-dc converter control circuits mc34063a/b jan. 2011 - rev. 1.0 - 12 - htc design formula table calculation step-up step-down voltage inverting t on /t off sat in(min) in(min) f out v v v v v ? ? + sat in(min) f out v v v v ? + sat in f out v v v v ? + (t on /t off )max min f 1 min f 1 min f 1 c t 5 10 0 . 4 ? t on 5 10 0 . 4 ? t on 5 10 0 . 4 ? t on i pk(switch) 2 out(max) i ) 1 t t ( on off + 2 out(max) i 2 out(max) i ) 1 t t ( on off + r sc 0.3 / pk(switch) i 0.3 / pk(switch) i 0.3 / pk(switch) i l (min) on(max) pk(switch) sat in(min) t ) i v v ( ? on(max) pk(switch) out sat in(min) t ) i v v v ( ? ? on(max) pk(switch) sat in(min) t ) i v v ( ? c o 9 ripple(pp) on out v t i ripple(pp) off on pk(switch) 8v ) t (t i + 9 ripple(pp) on out v t i terms and definitions v sat - saturation voltage of the output switch. vf - forward voltage drop of the output rectifier. the following power supply characteristics must be chosen: v in - nominal input voltage. v out - desired output voltage. i out - desired output current. f min - minimum desired output switching freque ncy at the selected values of v in and i o . v ripple(p-p) ? desired peak-to-pea k output ripple voltage. in practice the calculated capacitor value will need to be increased due to its 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.

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