MC34063AB, MC34063AC, MC34063EB, MC34063EC

1 This is information on a product in full production. February 2020 DocID5257 Rev 121/2323MC34063AB, mc34063ac , mc34063eb , MC34063EC DC-DC converter control circuitsDatasheet - production dataFeatures Output switch current in excess of A 2 % reference accuracy Low quiescent current: mA (typ.) Operating from 3 V to 40 V Frequency operation to 100 kHz Active current limitingDescriptionThe MC34063A/E series is a monolithic control circuit which delivers the main functions for DC-DC voltage 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 a minimum number of external components, the MC34063A/E device series is designed for step-down, step-up and voltage-inverting 1. Device summaryOrder , mc34063ac , mc34063eb , MC34063EC2/23 DocID5257 Rev 12 Contents1 Diagram.

2 32 Pin configuration .. 43 Maximum ratings .. 54 Electrical characteristics .. 65 Typical performance characteristics .. 86 Typical application circuit .. 107 Package mechanical data .. 188 Revision history .. 22 DocID5257 Rev 123/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECDiagram1 DiagramFigure 1. Block diagramPin configurationMC34063AB, mc34063ac , mc34063eb , MC34063EC4/23 DocID5257 Rev 122 Pin configurationFigure 2. Pin connectionsTable 2. Pin descriptionPin n SymbolName and function1 SWCS witch collector2 SWES witch emitter3 TCTiming capacitor4 GNDG round5 CIIC omparator inverting input6 VCCV oltage supply7 IPKIPK sense8 DRCV oltage driver collectorDocID5257 Rev 125/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECMaximum ratings3 Maximum ratingsNote:Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not 3. Absolute maximum ratingsSymbolParameterValueUnitVCCP ower supply voltage50 VVIRC omparator input voltage to 40 VVSWCS witch collector voltage40 VVSWES witch emitter voltage (VSWC = 40V)40 VVCES witch collector to emitter voltage40 VVDCD river collector voltage40 VIDCD river collector current100mAISWS witch dissipation at TA = 25 Cfor junction temperature150 CTSTGS torage temperature range-40 to 150 CTOPO perating ambient temperature rangefor AC and EC series0 to 70 Cfor AB series-40 to 85for EB series-40 to 125 Table 4.

3 Thermal dataSymbolParameterDIP-8SO-8 UnitRthJAThermal resistance junction-ambient (1)1. This value depends from thermal design of PCB on which the device is C/WRthJCThermal resistance junction-case4220 C/WElectrical characteristicsMC34063AB, mc34063ac , mc34063eb , MC34063EC6/23 DocID5257 Rev 124 Electrical characteristicsRefer to the test circuits, VCC = 5 V, TA = TLOW to THIGH, unless otherwise specified. (a)a. TLOW = 0 C, THIGH = 70 C (AC and EC series); TLOW = -40 C, THIGH = 85 C (AB series); TLOW = -40 C, THIGH = 125 C (EB series)Table 5. OscillatorSymbolParameterTest = 0V, CT = 1 nF, TA = 25 C243342kHzICHGC harge currentVCC = 5 to 40V, TA = 25 C243342 AIDISCHGD ischarge currentVCC = 5 to 40V, TA = 25 C140200260 AIDISCHG/ICHGD ischarge to charge current ratioPIN 7 = VCC, TA = 25 AVIPK(sense)Current limit sense voltage ICHG = IDISCHG, TA = 25 C250300350mVTable 6. Output switchSymbolParameterTest (sat)Saturation voltage, Darlington connectionISW = 1 A, PIN 1, 8 (sat)Saturation voltageISW = 1 A, RPIN8 = 82 to VCCF orced ~ current gainISW = 1 A,VCE = 5 V, TA = 25 C50120IC(off)Collector off-state currentVCE = 40 ATable 7.

4 ComparatorSymbolParameterTest voltageTA = 25 = TLOW to voltage line regulationVCC = 3 to 40 V110mVIIBI nput bias currentVIN = 0 V-5-400nADocID5257 Rev 127/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECElectrical characteristics Note:Maximum package power dissipation limit must be 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 = ICOUTPUT/(ICDRIVER - 1 mA) 10 Table 8. Total deviceSymbolParameterTest currentVCC = 5 to 40 VCT = 1 nFPIN 7 = VCCVPIN5 >VTHPIN 2 = GNDR emaining pins openfor MC34063 EVSTART-UPStart-up voltage (1)TA = 25 CCT = 1 F, PIN 5 = 0for Start-up voltage is the minimum power supply voltage at which the internal oscillator begins to performance characteristicsMC34063AB, mc34063ac , mc34063eb , MC34063EC8/23 DocID5257 Rev 125 Typical performance characteristics Figure 3.

5 Emitter follower configuration output saturation voltage vs. emitter currentFigure 4. Output switch ON-OFF time vs. oscillator timing capacitor Figure 5. Common emitter configuration output switch saturation voltage vs. collector currentFigure 6. Darlington configuration collector emitter saturation voltage (VCEsat) vs. temperature DocID5257 Rev 129/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECTypical performance characteristics Figure 7. Power collector emitter saturation voltage (VCEsat) vs. temperatureFigure 8. Current limit sense voltage (VIPK) vs. temperature Figure 9. Reference voltage vs. temperatureFigure 10. Bias current vs. temperature Figure 11. Supply current vs. temperatureFigure 12. Supply current vs. input voltage Typical application circuitMC34063AB, mc34063ac , mc34063eb , MC34063EC10/23 DocID5257 Rev 126 Typical application circuit Figure 13.

6 Step-up converter Figure 14. Printed evaluation board PIN 1 = VOUTPIN 2 = GNDPIN 3 = GNDPIN 4 = VINT able 9. Test condition (VOUT = 28 V)TestConditionsValue (Typ.)UnitLine RegulationVIN = 8 to 16 V, IO = 175 mA30mVLoad RegulationVIN = 12 V, IO = 75 to 175 mA10mVOutput RippleVIN = 12 V, IO = 175 mA300mVEfficiencyVIN = 12 V, IO = 175 mA89%DocID5257 Rev 1211/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECTypical application circuit Figure 15. Step-down converter Figure 16. Printed evaluation board PIN 1 = VOUTPIN 2 = GNDPIN 3 = GNDPIN 4 = VINT able 10. Test condition (VOUT = 5 V)TestConditionsValue (typ.)UnitLine regulationVIN = 15 to 25 V, IO = 500 mA5mVLoad regulationVIN = 25 V, IO = 50 to 500 mA30mVOutput rippleVIN = 25 V, IO = 500 mA100mVEfficiencyVIN = 25 V, IO = 500 mA80%ISCVIN = 25 V, RLOAD = application circuitMC34063AB, mc34063ac , mc34063eb , MC34063EC12/23 DocID5257 Rev 12 Figure 17.

7 Voltage inverting converter Figure 18. Printed evaluation board PIN 1 = VOUTPIN 2 = GNDPIN 3 = GNDPIN 4 = VINT able 11. Test condition (VOUT = 12 V)TestConditionsValue (typ.)UnitLine regulationVIN = to 6 V, IO = 100 mA15mVLoad regulationVIN = 5 V, IO = 10 to 100 mA20mVOutput rippleVIN = 5 V, IO = 100 mA230mVEfficiencyVIN = 5 V, IO = 100 mA58%ISCVIN = 5 V, RLOAD = Rev 1213/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECTypical application circuit Note:VSAT = Saturation voltage of the output switchVF = Forward voltage drop of the output rectifierThe following power supply characteristics must be chosen:VIN = Nominal input voltageVOUT = Desired output voltage, |VOUT| = (1 + R2/R1)IOUT = Desired output currentfMIN = Minimum desired output switching frequency at the selected values of VIN and IOVRIPPLE = 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.

8 The ripple voltage should be kept to a low value since it will directly affect the line and load 12. CalculationParameterStep-Up(Discontinuou s mode)Step-Down(Continuous mode)Voltage Inverting(Discontinuous mode)ton/toff (ton + toff) max1/fmin1/fmin1 (switch)2 Iout(max)[(ton/toff)+1]2 Iout(max)2 Iout(max)[(ton/toff)+1] (switch) (switch) (switch)CO L(min) VO UTVFVI N mi n() +VI N mi n()Vs at ---------------------------------------- ---------------VO UTVF+VI N mi n()Vs at VO U T ---------------------------------------- -------------------VO UTVF+VINVs at -------------------------------IouttonVr i ppl e p p ()-------------------------------IPK s wi tc h()tontoff+()8 Vri ppl e p p ()-------------------------------------- ----------------IouttonVri ppl e p p ()-------------------------------VI N mi n()Vs at IPK sw it c h()------------------------------------- -ton min() VI N mi n()Vs at Vout IP K sw it ch()

9 ---------------------------------------- ----------------ton mi n() VI N mi n()Vs at IPK sw it c h()------------------------------------- -ton min() Typical application circuitMC34063AB, mc34063ac , mc34063eb , MC34063EC14/23 DocID5257 Rev 12 Figure 19. Step-up with external NPN switch Figure 20. Step-down with external NPN switch DocID5257 Rev 1215/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECTypical application circuitFigure 21. Step-down with external PNP switch Figure 22. Voltage inverting with external NPN switch Typical application circuitMC34063AB, mc34063ac , mc34063eb , MC34063EC16/23 DocID5257 Rev 12 Figure 23. Voltage inverting with external PNP saturated switch Figure 24. Dual output voltage DocID5257 Rev 1217/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECTypical application circuitFigure 25. Higher output power, higher input voltage Package mechanical dataMC34063AB, mc34063ac , mc34063eb , MC34063EC18/23 DocID5257 Rev 127 Package mechanical dataIn order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance.

10 ECOPACK specifications, grade definitions and product status are available at: ECOPACK is an ST Rev 1219/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECPackage mechanical data DIP-8 mechanical dataP001 FPackage mechanical dataMC34063AB, mc34063ac , mc34063eb , MC34063EC20/23 DocID5257 Rev (max.) mechanical data0016023/CDocID5257 Rev 1221/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECPackage mechanical data & reel SO-8 mechanical dataRevision historyMC34063AB, mc34063ac , mc34063eb , MC34063EC22/23 DocID5257 Rev 128 Revision historyTable 13. Document revision historyDateRevisionChanges20-Nov-200710 Added Table note in Table a typo on Regline parameter (from 5 mV Max. to 10 mV Max.) in Table 7: Rev 1223/23MC34063AB, mc34063ac , mc34063eb , MC34063 ECIMPORTANT NOTICE PLEASE READ CAREFULLYSTM icroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice.