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november 2007 rev 10 1/23 23 mc34063ab - mc34063ac mc34063eb - mc34063ec dc/dc converter control circuits features output switch current in excess of 1.5 a 2 % reference accuracy low quiescent current: 2.5 ma (typ.) operating from 3 v to 40 v frequency operation to 100 khz active current limiting description the mc34063a/e series is a monolithic control circuit delivering the main functions for dc/dc voltage converting. the device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch. output voltage is adjustable through two external resistors with a 2 % reference accuracy. employing a minimum number of external components the mc34063a/e devices series is designed for step-down, step-up and voltage- inverting applications. so-8 dip-8 table 1. device summary order codes dip-8 so-8 MC34063ABN (1) mc34063abd-tr mc34063acn (1) mc34063acd-tr mc34063ebn mc34063ebd-tr mc34063ecn mc34063ecd-tr 1. the "a" version is not recommended for new designs. www.st.com
contents mc34063ab - mc34063ac - mc34063eb - mc34063ec 2/23 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
mc34063ab - mc34063ac - mc34063eb - mc34063ec diagram 3/23 1 diagram figure 1. block diagram
pin configuration mc34063ab - mc34063ac - mc34063eb - mc34063ec 4/23 2 pin configuration figure 2. pin connections table 2. pin description pin n symbol name and function 1 swc switch collector 2 swe switch emitter 3 tc timing capacitor 4 gnd ground 5 cii comparator inverting input 6v cc voltage supply 7i pk i pk sense 8 drc voltage driver collector
mc34063ab - mc34063ac - mc34063eb - mc34063ec maximum ratings 5/23 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. table 3. absolute maximum ratings symbol parameter value unit v cc power supply voltage 50 v v ir comparator input voltage range -0.3 to 40 v v swc switch collector voltage 40 v v swe switch emitter voltage (v swc = 40v) 40 v v ce switch collector to emitter voltage 40 v v dc driver collector voltage 40 v i dc driver collector current 100 ma i sw switch current 1.5 a p tot power dissipation at t a = 25c for dip-8 1.25 w for so-8 0.625 t j operating junction temperature 150 c t stg storage temperature range -40 to 150 c t op operating ambient temperature range for ac and ec series 0 to 70 c for ab series -40 to 85 for eb series -40 to 125 table 4. thermal data symbol parameter dip-8 so-8 unit r thja thermal resistance junction-ambient (1) 100 160 c/w r thjc thermal resistance junction-case 42 20 c/w 1. this value depends from thermal design of pcb on which the device is mounted.
electrical characteristics mc34063ab - mc34063ac - mc34063eb - mc34063ec 6/23 4 electrical characteristics (refer to the test circuits, v cc = 5 v, t a = t low to t high , unless otherwise specified, see note 2 ) table 5. oscillator symbol parameter test cond itions min. typ. max. unit f osc frequency v pin5 = 0v, c t = 1 nf, t a = 25c 24 33 42 khz i chg charge current v cc = 5 to 40v, t a = 25c 24 33 42 a i dischg discharge current v cc = 5 to 40v, t a = 25c 140 200 260 a i dischg /i chg discharge to charge current ratio pin 7 = v cc , t a = 25c 5.2 6.2 7.5 a v ipk(sense) current limit sense voltage i chg = i dischg, t a = 25c 250 300 350 mv table 6. output switch symbol parameter test cond itions min. typ. max. unit v ce(sat) saturation voltage, darlington connection i sw = 1 a, pin 7, 8 connected 1 1.3 v v ce(sat) saturation voltage i sw = 1 a, r pin8 = 82 to v cc forced ~ 20 0.45 0.7 v h fe dc current gain i sw = 1 a,v ce = 5 v, t a = 25c 50 120 i c(off) collector off-state current v ce = 40 v 0.01 100 a table 7. comparator symbol parameter test cond itions min. typ. max. unit v th threshold voltage t a = 25c 1.225 1.25 1.275 v t a = t low to t high 1.21 1.29 reg line threshold voltage line regulation v cc = 3 to 40 v 1 5 mv i ib input bias current v in = 0 v -5 -400 na
mc34063ab - mc34063ac - mc34063eb - mc34063ec electrical characteristics 7/23 note: 1 maximum package power dissipation limit must be observed. 2t low = 0 c, t high = 70 c (ac and ec series); t low = -40 c, t high = 85 c (ab series); t low = -40 c, t high = 125 c (eb series). 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 current switch = i coutput /(i cdriver - 1 ma (a) ) 10 4 start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work. table 8. total device symbol parameter test conditions min. typ. max. unit i cc supply current v cc = 5 to 40 v c t = 1 nf pin 7 = v cc v pin5 >v th pin 2 = gnd remaining pins open for mc34063a 2.5 4 ma 1.5 4 for mc34063e v start-up start-up voltage ( note 4 ) t a = 25c c t = 1 f, pin 5 = 0 for mc34063a 2.1 v for mc34063e 1.5 a. current less due to a built in 1 k anti leakage resistor.
typical performance characteristics mc34063ab - mc34063ac - mc34063eb - mc34063ec 8/23 5 typical performance characteristics figure 3. emitter follower configuration output saturation voltage vs emitter current figure 4. output switch on-off time vs oscillator timing capacitor figure 5. common emitter configuration output switch saturation voltage vs collector current figure 6. darlington configuration collector emitter saturation voltage (v cesat ) vs temperature
mc34063ab - mc34063ac - mc34063eb - mc34063ec typical performance characteristics 9/23 figure 7. power collector emitter saturation voltage (v cesat ) vs temperature figure 8. current limit sense voltage (v ipk ) vs temperature figure 9. reference voltage vs temperature figure 10. bias current vs temperature figure 11. supply current vs temperature figure 12. supply current vs input voltage
typical application circuit mc34063ab - mc34063ac - mc34063eb - mc34063ec 10/23 6 typical application circuit figure 13. step-up converter figure 14. printed evaluation board pin 1 = v out pin 2 = gnd pin 3 = gnd pin 4 = v in table 9. test condition (v out = 28 v) test conditions value (typ.) unit line regulation v in = 8 to 16 v, i o = 175 ma 30 mv load regulation v in = 12 v, i o = 75 to 175 ma 10 mv output ripple v in = 12 v, i o = 175 ma 300 mv efficiency v in = 12 v, i o = 175 ma 89 %
mc34063ab - mc34063ac - mc34063eb - mc34063ec typical application circuit 11/23 figure 15. step-down converter figure 16. printed evaluation board pin 1 = v out pin 2 = gnd pin 3 = gnd pin 4 = v in table 10. test condition (v out = 5 v) test conditions value (typ.) unit line regulation v in = 15 to 25 v, i o = 500 ma 5 mv load regulation v in = 25 v, i o = 50 to 500 ma 30 mv output ripple v in = 25 v, i o = 500 ma 100 mv efficiency v in = 25 v, i o = 500 ma 80 % i sc v in = 25 v, r load = 0.1 1.2 a
typical application circuit mc34063ab - mc34063ac - mc34063eb - mc34063ec 12/23 figure 17. voltage inverting converter figure 18. printed evaluation board pin 1 = v out pin 2 = gnd pin 3 = gnd pin 4 = v in table 11. test condition (v out = 12 v) test conditions value (typ.) unit line regulation v in = 4.5 to 6 v, i o = 100 ma 15 mv load regulation v in = 5 v, i o = 10 to 100 ma 20 mv output ripple v in = 5 v, i o = 100 ma 230 mv efficiency v in = 5 v, i o = 100 ma 58 % i sc v in = 5 v, r load = 0.1 0.9 a
mc34063ab - mc34063ac - mc34063eb - mc34063ec typical application circuit 13/23 note: v sat = saturation voltage of the output switch v f = 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, |v out | = 1.25 (1 + r 2 /r 1 ) i out = desired output current f min = minimum desired output switching frequency at the selected values of v in and i o v ripple = desired peak to peak output ripple voltage. in practice, the calculated capacitor value will and to be increased due to its equival ent 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. table 12. calculation parameter step-up (discontinuous mode) step-down (continuous mode) voltage inverting (discontinuous mode) t on /t off (t on + t off ) max 1/f min 1/f min 1/f min c t 4.5x10 -5 t on 4.5x10 -5 t on 4.5x10 -5 t on i pk(switch) 2i out(max) [(t on /t off )+1] 2i out(max) 2i out(max) [(t on /t off )+1] r sc 0.3/i pk(switch) 0.3/i pk(switch) 0.3/i pk(switch) c o l (min) out v f v in m i ( ? + v in min () v sat ? - --------------------------------------------- -- v out v f + nmin () v sat ? v o u ? - ------------------------------------------------ -- v out v f + v in v sat ? ------------------------------ - i out t on v ripple p p ? () ------------------------------ - i pk switch () t on t off + () 8v ripple p p ? () ----------------------------------------------------- - i out t on v ripple p p ? () ------------------------------ - v in min () v sat ? i pk switch () - ---------------------------------- t on m i ( n min () v sat ? v out ? i pk switch () -- ---------------------------------------------- - t on ( v in min () v sat ? i pk switch () - ---------------------------------- t on m i (
typical application circuit mc34063ab - mc34063ac - mc34063eb - mc34063ec 14/23 figure 19. step-up with external npn switch figure 20. step-down with external npn switch
mc34063ab - mc34063ac - mc34063eb - mc34063ec typical application circuit 15/23 figure 21. step-down with external pnp switch figure 22. voltage inverting with external npn switch
typical application circuit mc34063ab - mc34063ac - mc34063eb - mc34063ec 16/23 figure 23. voltage inverting with external pnp saturated switch figure 24. dual output voltage
mc34063ab - mc34063ac - mc34063eb - mc34063ec typical application circuit 17/23 figure 25. higher output power, higher input voltage
package mechanical data mc34063ab - mc34063ac - mc34063eb - mc34063ec 18/23 7 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com
mc34063ab - mc34063ac - mc34063eb - mc34063ec package mechanical data 19/23 dim. mm. inch. min. typ. max. min. typ. max. a 3 . 3 0.1 3 0 a 1 0.7 0.02 8 b1. 39 1.65 0.055 0.065 b1 0. 9 1 1.04 0.0 3 6 0.041 b 0.5 0.020 b 10. 38 0.5 0.015 0.020 d 9 . 8 0. 38 6 e 8 . 8 0. 3 46 e 2.54 0.100 e 3 7.62 0. 3 00 e4 7.62 0. 3 00 f 7.1 0.2 8 0 i4. 8 0.1 89 l 3 . 3 0.1 3 0 z 0.44 1.6 0.017 0.06 3 pla s tic dip- 8 mechanical data p001f
package mechanical data mc34063ab - mc34063ac - mc34063eb - mc34063ec 20/23 dim. mm. inch. min. typ. max. min. typ. max. a1. 3 5 1.75 0.05 3 0.06 9 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.04 3 0.065 b0. 33 0.51 0.01 3 0.020 c0.1 9 0.25 0.007 0.010 d4. 8 0 5.00 0.1 89 0.1 9 7 e 3 . 8 0 4.00 0.150 0.157 e 1.27 0.050 h5. 8 0 6.20 0.22 8 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k 8 (m a x.) ddd 0.1 0.04 s o- 8 mechanical data 001602 3 /c
mc34063ab - mc34063ac - mc34063eb - mc34063ec package mechanical data 21/23 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 22.4 0. 88 2 ao 8 .1 8 .5 0. 3 1 9 0. 33 5 bo 5.5 5. 9 0.216 0.2 3 2 ko 2.1 2. 3 0.0 8 2 0.0 9 0 po 3 . 9 4.1 0.15 3 0.161 p7. 98 .1 0. 3 11 0. 3 1 9 tape & reel s o- 8 mechanical data
revision history mc34063ab - mc34063ac - mc34063eb - mc34063ec 22/23 8 revision history table 13. document revision history date revision changes 22-jun-2004 9 20-nov-2007 10 added ta b l e 1 .
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