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1/16 march 2004 output switch current in excess of 1.5a 2% reference accuracy low quiescent current: 2.5ma (typ.) operatingfrom3vto40v frequency operation to 100khz 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. mc34063a mc34063e dc/dc converter control circuits block diagram dip-8 so-8
mc34063a/e 2/16 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. thermal data (*) this value depends from thermal design of pcb on which the device is mounted. connection diagram (top view) pin description 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 symbol parameter dip-8 so-8 unit r thj-amb thermal resistance junction-ambient (*) 100 160 c/w r thj-case thermal resistance junction-case 42 20 c/w 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
mc34063a/e 3/16 ordering codes (*) the "a" version is not recommended for new designs. electrical characteristics (refer to the test circuits, v cc =5v,t a =t low to t high , unless otherwise specified, see note 2) oscillator output switch comparator type dip-8 so-8 so-8 (tape & reel) MC34063AB MC34063ABn MC34063ABd MC34063ABd-tr mc34063ac mc34063acn mc34063acd mc34063acd-tr mc34063eb mc34063ebn mc34063ebd mc34063ebd-tr mc34063ec mc34063ecn mc34063ecd mc34063ecd-tr symbol parameter test conditions min. typ. max. unit f osc frequency v pin5 =0v c t =1nf t a =25c243342khz i chg charge current v cc = 5 to 40v t a =25c 243342a 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 symbol parameter test conditions 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 =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 = 25c 50 120 i c(off) collector off-state current v ce =40v 0.01 100 a symbol parameter test conditions 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 =3to40v 1 5 mv i ib input bias current v in = 0 v -5 -400 na
mc34063a/e 4/16 total device notes: 1) maximum package power dissipation limit must be observed. 2) t low =0c,t high = 70c (ac and ec series); t low =-40c,t high = 85c (ab series); t low = -40c, t high = 125c (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 -1ma*) 10 * current less due to a built in 1k ? anti leakage resistor. 4) start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work. typical performance characteristics figure 1 : emitter follower configuration output saturation voltage vs emitter current figure 2 : output switch on-off time vs oscillator timing capacitor figure 3 : common emitter configuration output switch saturation voltage vs collector current figure 4 : darlington configuration collector emitter saturation voltage (v cesat) vs temperat. symbol parameter test conditions min. typ. max. unit i cc supply current v cc =5to40v c t =1nf 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 =1f,pin5=0 for mc34063a 2.1 v for mc34063e 1.5
mc34063a/e 5/16 figure 5 : power collector emitter saturation voltage (v cesat) vs temperature figure 6 : current limit sense voltage (v ipk )vs temperature figure 7 : reference voltage vs temperature figure 8 : bias current vs temperature figure 9 : supply current vs temperature figure 10 : supply current vs input voltage
mc34063a/e 6/16 typical application circuit step-up converter printed demoboard test condition (v out = 28v) pin 1 = v out pin 2 = gnd pin 3 = gnd pin 4 = v in test conditions value (typ.) unit line regulation v in =8to16v, i o = 175 ma 30 mv load regulation v in =12v, i o =75to175ma 10 mv output ripple v in =12v, i o = 175 ma 300 mv efficiency v in =12v, i o = 175 ma 89 %
mc34063a/e 7/16 step-down converter printed demoboard test condition (v out =5v) test conditions value (typ.) unit line regulation v in =15to25v, i o = 500 ma 5 mv load regulation v in =25v, i o =50to500ma 30 mv output ripple v in =25v, i o = 500 ma 100 mv efficiency v in =25v, i o = 500 ma 80 % i sc v in =25v, r load =0.1 ? 1.2 a pin 1 = v out pin 2 = gnd pin 3 = gnd pin 4 = v in
mc34063a/e 8/16 voltage inverting converter printed demoboard test condition (v out = -12v) test conditions value (typ.) unit line regulation v in = 4.5 to 6 v, i o = 100 ma 15 mv load regulation v in =5v, i o =10to100ma 20 mv output ripple v in =5v, i o = 100 ma 230 mv efficiency v in =5v, i o = 100 ma 58 % i sc v in =5v, r load =0.1 ? 0.9 a pin 1 = v out pin 2 = gnd pin 3 = gnd pin 4 = v in
mc34063a/e 9/16 calculation notes: 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 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. step-up with external npn switch 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) v out v f v in min () ? + v in min () v sat ? ------------------------------------------------------- - v out v f + v in min () v sat ? v out ? ----------------------------------------------------------- - 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 min () v in min () v sat ? v out ? i pk switch () -------------------------------------------------------- t on min ( ) v in min () v sat ? i pk switch () -------------------------------------- - t on min ()
mc34063a/e 10/16 step-down with external npn switch step-down with external pnp switch
mc34063a/e 11/16 voltage inverting with external npn switch voltage inverting with external pnp saturated switch
mc34063a/e 12/16 dual output voltage higher output power, higher input voltage
mc34063a/e 13/16 dim. mm. inch min. typ max. min. typ. max. a 3.3 0.130 a1 0.7 0.028 b 1.39 1.65 0.055 0.065 b1 0.91 1.04 0.036 0.041 b 0.5 0.020 b1 0.38 0.5 0.015 0.020 d 9.8 0.386 e 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 f 7.1 0.280 i 4.8 0.189 l 3.3 0.130 z 0.44 1.6 0.017 0.063 plastic dip-8 mechanical data p001f
mc34063a/e 14/16 dim. mm. inch min. typ max. min. typ. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 3.80 4.00 0.150 0.157 e 1.27 0.050 h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k ? (max.) ddd 0.1 0.04 so-8 mechanical data 0016023/c 8
mc34063a/e 15/16 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 8.1 8.5 0.319 0.335 bo 5.5 5.9 0.216 0.232 ko 2.1 2.3 0.082 0.090 po 3.9 4.1 0.153 0.161 p 7.9 8.1 0.311 0.319 tape & reel so-8 mechanical data
mc34063a/e 16/16 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2004 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com

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