unisonic technologies co., ltd mc34063a linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2012 unisonic technologies co., ltd qw-r103-008,i dc to dc converter controller ? description the utc mc34063a is a monolithic regulator subsystem, intended for use as dc to dc converter. this device contains a temperature compensated band gap reference, a duty-cycle control oscillator, driver and high current output switch. it can be used for step down, step-up or in verting switching regulators as well as for series pass regulators. ? features * operation from 3.0v to 40v. * short circuit current limiting. * low standby current. * output switch current of 1.5a without external transistors. * frequency of operation from 100hz to 100khz. * step-up, step-down or inverting switch regulators. ? ordering information ordering number package packing lead free halogen free mc34063al-d08-t mc34063ag-d08-t dip-8 tube mc34063al-s08-r mc34063ag-s08-r sop-8 tape reel MC34063AL-S08-T mc34063ag-s08-t sop-8 tube
mc34063a linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r103-008,i ? pin configuration switch collector switch emitter timing capacitor gnd driver collector i peak sense v cc comparator inverting input 1 2 3 4 8 7 5 6 ? pin description pin no pin name i/o description 1 switch collector i internal darlington pairs ti collector 2 switch emitter o internal darlington pairs ti emitter 3 timing capacitor the value of selected capacit or controls the internal oscillator run rate 4 gnd 5 comparator inverting input i inverting input of comparator which c an set & initiate the darlington pairs output switch 6 v cc 7 i peak sense i current sense input to monitor t he voltage drop across an external resistor placed in series with v cc 8 driver collector i internal darlington pairs ti collector ? block diagram 8 7 5 4 2 1 3 6 q s r c e t1 t2 a is d b ct vcc gnd timing capacitor switch emitter switch collector 1.25v ref comp. oscillator comparator inverting input i peak sense drive collector
mc34063a linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r103-008,i ? absolute maximum ratings (t a =25 , unless otherwise specified. ) parameter symbol ratings unit supply voltage v cc 40 v comparator input voltage v in ( comp ) -0.3 ~ +40 v switch collector voltage v c ( sw ) 40 v switch emitter voltage v e ( sw ) 40 v switch collector to emitter voltage v ce ( sw ) 40 v driver collector voltage v c ( dr ) 40 v switch current i sw 1.5 a power dissipation (t a =25 c) dip-8 p d 1250 mw sop-8 625 junction temperature t j +150 operating temperature t opr 0 ~ +70 storage temperature t stg -65 ~ +150 note: absolute maximum ratings are those values beyond which the device which the device could be permanently damaged. absolute maximum ratings are stress ratings on ly and functional device operation is not implied. ? thermal data parameter symbol ratings unit junction-to-ambient dip-8 ja 100 /w sop-8 160 ? electrical characteristics (v cc =5.0v, t a =0~+70 , unless otherwise specified.) parameter symbol test conditions min typ max unit oscillator charging current i chg v cc =5 to 40v, t a =25 22 31 42 a discharging current i dischg v cc =5 to 40v, t a =25 140 190 260 a oscillator amplitude v osc t a =25 0.5 v discharge to charge current ratio k v 7 =v cc , t a =25 5.2 6.1 7.5 current limit sense voltage v sense i chg =i dischg , t a =25 250 300 350 mv output switch saturation voltage 1 (note) v ce ( sat ) 1 i sw =1.0a, v c ( driver ) =v c ( sw ) 0.95 1.3 v saturation voltage 2 (note) v ce ( sat ) 2 i sw =1.0a, v c ( driver ) =50ma 0.45 0.7 v dc current gain (note) g i ( dc ) i sw =1.0a, v ce =5.0v, t a =25 50 180 collector off state current (note) i c ( off ) v ce =40.0v, t a =25 0.01 100 a comparator threshold voltage v thd 1.21 1.24 1.29 v threshold voltage line regulation v thd v cc =3 ~ 40v 2.0 5.0 mv input bias current i i ( bias ) v in =0v 50 400 na total device supply current i cc v cc =5~40v, c t =0.001 v 7 =v cc , v c >v thd , pin2=gnd 2.7 4.0 ma n ote : output switch tests are performed under puls ed conditions to minimize power dissipation.
mc34063a linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r103-008,i ? step-up converter 170 h 1n5819 180 8 l 1 2 3 4 c t 7 6 5 r sc 0.22 v in 12v 1500pf 1.25v r ef r eg q1 q2 c t o sc i pk v cc comp. 100 + + - sq r r 2 47k 2.2k r 1 330 c o + v out 28v/175ma 100 + v out 1.0 h optional filter test conditions results line regulation v in = 8.0v ~ 16v, i out = 175ma 30mv = 0.05% load regulation v in = 12v, i out = 75ma ~ 175ma 10mv = 0.017% output ripple v in = 12v, i out = 175ma 400mv p-p efficiency v in = 12v, i out = 175ma 87.7% output ripple with optional filter v in = 12v, i out = 175ma 40mv p-p
mc34063a linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r103-008,i ? step-down converter(cont.) test conditions results line regulation v in = 15v ~ 25v, i out = 500ma 12mv = 0.12% load regulation v in = 25v, i out = 50ma ~ 500ma 3.0mv = 0.03% output ripple v in = 25v, i out = 500ma 120mv p-p short circuit current v in = 25v, r l = 0.1 ? 1.1a efficiency v in = 25v, i out = 500ma 83.7% output ripple with optional filter v in = 25v, i out = 500ma 40mv p-p
mc34063a linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r103-008,i ? voltage inverting converter test conditions results line regulation v in = 4.5v ~ 6.0v, i out = 100ma 3.0mv = 0.012% load regulation v in = 5.0v, i out = 10ma ~ 100ma 0.022v = 0.09% output ripple v in = 5.0v, i out = 100ma 500mv p-p short circuit current v in = 5.0v, r l = 0.1 ? 910ma efficiency v in = 5.0v, i out = 100ma 62.2% output ripple with optional filter v in = 5.0v, i out = 100ma 70mv p-p
mc34063a linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r103-008,i ? external current boost connections for ic peak greater than 1.5a
mc34063a linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r103-008,i ? typical characteristics output switch on-off time versus oscillator timing capacitor oscillator timing capacitor, c t (nf) timing capacitor waveform 10 s/div 10 3 10 2 10 1 10 0 10 -2 10 -1 10 0 10 1 v cc = 5.0v pin 7 = v cc pin 5 = gnd t a = 25 t on t off pin 1,5,8 = open c t = 1.0nf t a = 25 v cc = 5.0v pin 7 = v cc pin 2 = gnd
mc34063a linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r103-008,i ? design formula table calculation step-down step-up voltage-inverting t on t off v out + v f v in -v ce(sat) (t on +t off ) max 1 f min 1 f min c t 4x10 -5 t on 4x10 -5 t on 4x10 -5 t on i sw 2i out(max) r s 0.3/i sw 0.3/i sw 0.3/i sw l (min) c o i out t on v ripple(p-p) v ce ( sat ) - saturation voltage of the output switch. v f - forward voltage drop of the ringback 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 for v in and i out . v ripple(p-p) - desired peak-to-peak output rippl e voltage. in practice, the calcul ated value will need to be increased due to the capacitor equivalent series resistance and board layout. the ripple voltage should be kept to a low value since it will directly effect the line and load regulation. utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior writt en consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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