0.8a step down / step up / inverting dc-dc converter mc34063c features operating from 3v to 40v low standby current current limitting output switch current to 0.8a output valtage adjustable operation frequency up to 180khz (ct=100pf) precision 2% reference moisture sensitivity level 3 a pp lication battery chargers nics / switches / hubs adsl modems negative voltage power supplies ordering information description the mc34063c is a monolithic switching regulator control circuit containing the primary funtions required for dc-dc converters. this device consists of internal temperature compenssated reference, voltage comparator, cotrolled duty cycle duty cycle oscillator with active current. the device is specifically designed to be used in step-down, step-up and voltage-inverting applications with a minimum number of external components. the mc34063c is the enhanced version of mc34063a with the ability to work in higher frequency. the 34063c is available in 2 pcakages : sop-8 and dip-8. 2008 - ver. 1.0 htc ? 1 ? device mc34063cd MC34063CN package sop-8 dip-8 8 sop/ 8 dip pin configulation sop-8 pkg dip-8 pkg comparator inverting input switch emitter timing capacitor ground ipk sense vcc driver collector switch collector 1 2 3 4 8 7 6 5
0.8a step down / step up / inverting dc-dc converter mc34063c block diagram absolute maximum ratings (note 1) parameter value unit power supply voltage comparator input voltage range switch collector voltage switch emitter voltage (vswc=40v) switch collector to emitter voltage driver collector voltage driver collector current (note 2) switch current power dissipation at t amb =25 thermal resistance power dissipation at t amb =25 thermal resistance operating juntion temperature range storage temperature range absolute maximum rating are those values beyond which damage to the device may occur. functional operation under these condition is not implied. htc ? 2 ? p ja pd p ja sop package dip package 100 /w 0.625 w 40 v -0.3 to 40 v 40 v 40 v -65 to +150 -40 to 150 v swe 1.25 w pd 0.8 a 40 v 40 v 160 /w 100 ? t j t stg symbol v ce v dc i dc i sw v cc v ir v swc ipk oscillator s r 8 3 6 4 5 7 2 1 q + vcc drive collector ipk sense switch emitter switch collector gnd - 1.25v reference regulator comparator lnverting input comparator q2 q1 timing capacitor
0.8a step down / step up / inverting dc-dc converter mc34063c electrical characteristics (refer to the test circuits, v cc =5v, t a = -40 to 85 ) oscillator frequency v pin5 = 0 v ,c t = 100pf ,t a = 25 o c charge current v cc = 5 to 40v ,t a = 25 o c discharge current v cc = 5 to 40v ,t a = 25 o c discharge to charge current ratio pin 7= v cc ,t a = 25 o c current limit sense voltage i chg = i dischg ,t a = 25 o c output switch (note 3) saturation voltage, darlington connection i sw = 1a ,r pin8 = 82 ? to v cc , forced ~ 20 dc current gain i sw = 1a, v ce = 5v, t a = 25 o c collector off-state current v ce = 40v comparator t a = 25 o c t a = t low to t high threshold voltage line regulation v cc = 3 to 40v input bias current v in = 0v total device v cc = 5 to 40v, c t =1 ? pin7= v cc ,v pin5 >v th , pin2=gnd remaining pins open for mc34063c notes: 1 stresses greater than those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress retings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. exposure to "absolute maximum ratings" for extended periods may affect device reliability. 2 maximum package power dissipation limits must be observed. 3 low duty cycle pulse technique are used during test to maintain juntion temperature as close to ambient temperature as possible. 4 if the output switch is driven into hard saturation (non-darlington configuration) at low switch currents ( 300ma) and high driver currents ( 30ma), it may take up to 2.0 ? for it to come out of saturation. this condition will shorten the off time at frequencies 30khz, and is magnified at high temperatures. this condition does not occur with a darlington configuration, since the output switch cannot saturate. htc 1.25 v ce(sat) v ce(sat) v th saturation voltage (note 4) i sw = 1a ,pins 1,8 connected threshold voltage v 1.29 ? 3 ? i cc supply current typ. 1.21 symbol parameter max. uni t symbol parameter test conditions min. 2.5 4 ? ? i ib -20 -400 ? reg line 1.4 5 v 1.225 1.275 ? uni t v test conditions min. typ. max. i c(off) 0.01 100 h fe 50 75 0.45 0.8 typ. max. uni t 1 1.3 v symbol parameter test conditions min. v ipk(sense) 250 300 350 ? i dischg /i chg 5.2 6.5 7.5 ? i dischg 180 240 290 ? i chg 30 38 45 typ. max. uni t f osc 170 180 190 khz symbol parameter test conditions min.
0.8a step down / step up / inverting dc-dc converter mc34063c typical performance characteristic s o { j 4 3 output switch on-off time versus oscillator timing capacitor timing capacitor waveform oscillator frequency versus timing capacitor standby supply current versus supply voltage a c b d 0.1 time ? 10s / div v osc ? oscillator voltage (v) 200mv / di v 1 t on/off ? ou tput switch on /off time (s) 10 100 1000 1 10 100 t on t off v cc = 5v pin7= v cc pin5 = gnd t a = 25c v cc = 5v pin7= v cc pin2 = gnd pins1, 5, 8 = open t a = 25c c t = 1nf c t ? oscillator timing capacitor (nf) c t ? oscillator timing capacitor (nf) 0.1 1 10 100 frequency (khz) 1 10 100 v cc = 5v pin7= v cc pin5 = gnd t a = 25c 0 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 10 15 20 25 30 35 40 i cc ? supply current (ma) v cc ? supply voltage (v) c t = 1nf pin7= v cc pin2 = gnd emitter follower configuration output saturation voltage vs. emitter current common emitter configuration output switch saturation voltage vs. collector current e f 1.35 v cc = 5v pins 1, 7, 8 = v cc pins 3, 5 = gnd t a = 25c 1.40 1.45 1.50 1.55 1.60 1.65 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 emitter current (a) saturation voltage (v) darlington connection 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 collector current (a) -0.1 0 0.1 0.3 saturation voltage (v) 0.2 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 v cc = 5v pins 7= v cc pins 2, 3, 5 = gnd t a = 25c forced ? = 20 curre nt lim it se ns e vo ltage versus temperature g 0 temperature (c) 20 40 60 80 100 120 140 -20 -40 -60 250 255 260 265 270 275 280 285 290 295 300 current limit sense voltage (mv)
0.8a step down / step up / inverting dc-dc converter mc34063c typical application circuit step-up converter drc swc ipk swe vcc tc v in cii gnd v out 12v 28v/175? mc34063c step-down converter drc swc ipk swe vcc tc v in cii gnd 25v mc34063c v out 5v/0.5a htc ? 5 ? c 2 100? + r 1 c 3 1500pf r 3 r sc r 2 d 1 in5819 c 1 330? + l 1 8 7 6 5 1 2 3 4 180 0.4 2.2k 47k 120h c 2 100? + r 1 c 3 470? r sc r 2 in5819 d 1 c 1 470? + 220h l 8 7 6 5 1 2 3 4 0.4 1.2k 3.6k
0.8a step down / step up / inverting dc-dc converter mc34063c step-up with external npn switch v out v in voltage inverting converter drc swc ipk swe vcc tc v in cii gnd 4.5v to 6v mc34063c v out -12v /100? htc ? 6 ? c 2 100? + r 2 c 3 1.5? r 3 r 1 d 1 byv10-40 c 1 1000? + l 1 8 7 6 5 1 2 3 4 0.4 8.2k 953 - + r sc + 1 2 3 4 5 6 7 8 q2 q1 comparator ipk oscillator 1.25v reference regulator 150h s q r
0.8a step down / step up / inverting dc-dc converter mc34063c step-down with external npn switch v out v in step-down with external pnp switch v out v in htc ? 7 ? - + r sc + 2 3 4 5 6 q2 q1 comparator ipk oscillator 1.25v reference regulator 1 8 7 - + r sc + 2 3 4 5 6 7 8 q2 q1 comparator ipk oscillator 1.25v reference regulator 1 s q r s q r
0.8a step down / step up / inverting dc-dc converter mc34063c voltage inverting with external npn switch v out v in voltage inverting with external pnp saturated switch v out v in htc ? 8 ? - + r sc 5 6 7 8 q2 q1 comparator ipk oscillator 1.25v reference regulator 1 + - + r sc q2 q1 comparator ipk oscillator 1.25v reference regulator + s q r s q r 2 3 4 8 7 6 5 4 3 2 1
0.8a step down / step up / inverting dc-dc converter mc34063c dual output voltage +12v gnd -12v v in higher output power, higher input voltage +v out -v out v in htc ? 9 ? r sc 5 q2 q1 comparator ipk oscillator 1.25v reference regulator + + 6 7 8 1 2 3 4 s q r r sc 2 3 4 6 ipk oscillator 1.25v reference regulator 7 1 8 5 + + isolated from input s q r comparator - + - +
|
