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universal dc to dc converter - 1 - www.matrix-microtech.com.tw MT34063 ? description the MT34063 is designed for the applications which require dc - dc converters. it can be operated in a wide input range from 3.0v to 40v and has the controlled duty cycle oscillator, driver and high current output switch. also, with the internal temperature compensation circuit, the MT34063 provides an internally trimmed precision 2% reference voltage of 1.25v. these features make the MT34063 suitable for step-up, step-down and voltage?inverting applications. the m34063 is available in the 8-pin plastic soic and 8-pin plastic dip packages. ? features ? output switch current up to 1.5a ? wide supply voltage range 3.0v to 40v ? 100khz operational frequency ? low standby current ? adjustable output voltage ? internally trimmed 2% 1.25v reference voltage ? direct pin-to-pin replacement for industrial product mc34063a. ? applications ? adaptors ? battery chargers ? mother board ? pin configurations sop-8 (top view) dip-8 (top view) MT34063m MT34063t free datasheet http://www..net/
universal dc to dc converter - 2 - www.matrix-microtech.com.tw MT34063 ? block diagram pin assignment descriptions pin 1 : sc - switch collector pin pin 8 : drc- driver collector pin 2 : se - switch emitter pin 7 : i sen - i peak sense pin 3 : cap - oscillator timing capacitor pin 6 : v cc - power supply pin 4 : gnd - ground pin 5 : v fb - comparator inverting input ? absolute maximum ratings parameter symbol maximum unit supply voltage v cc 40 v thermal resistance junction to ambient sop-8 150 o c/w dip-8 ja 95 o c/w junction temperature t j 150 o c storage temperature range t stg -65 to 150 o c operating temperature t opr 0 to 70 o c note: exceeding these ratings could cause damage to the device. all voltages ar e with respect to ground. currents are positive into, negative out of the specified terminal. free datasheet http://www..net/
universal dc to dc converter - 3 - www.matrix-microtech.com.tw MT34063 ? ordering information device package t a ( o c ) note MT34063m m sop-8 0 to 70 MT34063t t dip-8 0 to 70 ? power dissipation table package ja ( o c /w ) df( mw/ o c) t a 25 o c t a 25 o c power rating(mw) t a =70 o c power rating(mw) t a = 85 o c power rating (mw) m 150 6.06 833 533.3 433.3 t 95 10.53 1316 842 684 note : 1. exceeding the maximum allowable power dissipation will re sult in excessive die temperature, and the regulator will go into thermal shutdown 2. t j : junction temperature calculation: t j = t a + (p d ja ), the ja numbers are guidelines for the thermal pe rformance of the device/pc-board system all of the above assume no ambient airflow 3. ja: thermal resistance-junction to ambient, d f : derating factor, p o : power consumption. ? recommended operating conditions v cc = 5.0 v, t a = t low to t high unless otherwise specified operating conditions parameter symbol min. typ. max. unit comparator input voltage v fb -0.3 to +40 v switch collector voltage v c(switch) - 40 v switch emitter voltage (v pin1 =40v) v e(switch) - 40 v switch collector to emitter voltage v ce(switch) - 40 v driver collector voltage v c(driver) - 40 v driver collector current (note 1) i c(driver) - - 100 ma switch current i sw - - 1.5 a timing capacitor (connected to cap pin) c t - 1 - nf operating ambient temperature range t a 0 to +70 o c note 1: maximum package power dissipation limits must be observed. free datasheet http://www..net/
universal dc to dc converter - 4 - www.matrix-microtech.com.tw MT34063 ? electrical characteristics v cc = 5.0 v, t a = t low to t high unless otherwise specified parameter symbol test conditions min. typ max. unit oscillator frequency f osc v pin5 = 0 v, c t = 1.0nf, t a = 25 o c 24 33 45 khz charge current i chg v cc = 5.0 v to 40 v, t a = 25c 24 35 45 a discharge current i dischg v cc = 5.0 v to 40 v, t a = 25c 140 220 290 a discharge to charge current ratio i dischg /i chg pin 7 to v cc , t a = 25c 5.2 6.5 7.5 - current limit sense voltage v sense i chg = i dischg , t a = 25c 250 300 350 mv output switch saturation voltage, darlington connection v ce(sat) i sw = 0.8 a, pins 1, 8 connected - 1.0 1.3 v saturation voltage v ce(sat) i sw = 1.0 a, r pin 8 = 82 ? to v cc , forced = 20 - 0.45 0.7 v dc current gain h fe i sw = 1.0 a, v ce = 5.0 v, t a = 25c 50 75 - - collector off state current i c(off) v ce = 40 v - 0.01 100 a comparator t a = 25c 1.225 1.25 1.275 threshold voltage v th t a =0c to 70c 1.21 - 1.29 v threshold voltage line regulation reg line v cc = 3.0 v to 40 v - 1.4 5.0 mv input bias current i ib v fb = 0 v - -20 -400 na total device supply current i cc v cc = 5.0 v to 40 v, c t = 1.0nf, pin 7 = v cc , v fb > v th , pin 2= gnd, remaining pins open - - 4.0 ma free datasheet http://www..net/
universal dc to dc converter - 5 - www.matrix-microtech.com.tw MT34063 ? typical applications figure1. step-up converter application circuit figure2. external current boost connections for i c peak greater than 1.5a 2.a external npn switch 2.b external npn saturated switch free datasheet http://www..net/
universal dc to dc converter - 6 - www.matrix-microtech.com.tw MT34063 figure3. step-down converter application circuit figure4. external current boost connections for i c peak greater than 1.5 a 4a. external npn switch 4b. external saturated switch free datasheet http://www..net/
universal dc to dc converter - 7 - www.matrix-microtech.com.tw MT34063 figure5. voltage inverting converter figure6. external current boost connections for i c peak greater than 1.5 a 6a. external npn switch 6b. external npn saturated switch free datasheet http://www..net/
universal dc to dc converter - 8 - www.matrix-microtech.com.tw MT34063 ? typical design reference table calculation step-up step-down voltage inverting t on / t off vout + vf - vin(min) vin(min) - vsat vout + vf vin(min) - vsat - vout vout + vf vin - vsat t on + t off 1 f 1 f 1 f t off ton + toff ton / toff + 1 ton + toff ton / toff + 1 ton + toff ton / toff + 1 t on ( t on + t off ) - t off ( t on + t off ) - t off ( t on + t off ) - t off c t 4.0 x 10 -5 t on 4.0 x 10 -5 t on 4.0 x 10 -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) l (min) ( (v(min) - v(sat) ipk(switch) ) t on(max) ( (v(min) - v(sat) ? vout) ipk(switch) ) t on(max) ( (v(min) - v(sat) ipk(switch) ) t on(max) c o 9 iout ton v ripple(pp) ipk(switch) ( ton + toff ) 8v ripple(pp) 9 iout ton v ripple(pp) v f : forward voltage drop of the output rectifier v sat : saturation voltage of the output switch. the following power supply characteristics must be chosen: v in - nominal input voltage v ou t - desired output voltage, |v out | = 1.25(1 + r1/r2) i out - desired output current. f min ? minimum desired output switching frequency at the selected values of v in and i o v ripple(pp) ? desired peak ? to ? peak output ripple voltage. application concerns: to get the best regulation performance, low esr capacitors at v out are suggested. free datasheet http://www..net/
universal dc to dc converter - 9 - www.matrix-microtech.com.tw MT34063 ? typical performance characteristics free datasheet http://www..net/
universal dc to dc converter - 10 - www.matrix-microtech.com.tw MT34063 ? characterization curves free datasheet http://www..net/
universal dc to dc converter - 11 - www.matrix-microtech.com.tw MT34063 ? physical dimensions 8-pin plastic s.o.i.c. (m) free datasheet http://www..net/
universal dc to dc converter - 12 - www.matrix-microtech.com.tw MT34063 ? physical dimensions 8-pin plastic dip (t) free datasheet http://www..net/

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