MC34063A, MC33063A, 1.5 A, Step-Up/Down/ Inverting ...

1 Semiconductor Components Industries, LLC, 2003 December, 2003 Rev. 111 Publication Order Number:MC34063A/DMC34063A, MC33063A, A, Step-Up/Down/ Inverting SwitchingRegulatorsThe MC34063A Series is a monolithic control circuit containing theprimary functions required for DC to DC converters. These devicesconsist of an internal temperature compensated reference, comparator,controlled duty cycle oscillator with an active current limit circuit,driver and high current output switch. This series was specificallydesigned to be incorporated in Step Down and Step Up andVoltage Inverting applications with a minimum number of externalcomponents. Refer to Application Notes AN920A/D and AN954/Dfor additional design information.

2 Operation from V to 40 V Input Low Standby Current Current Limiting Output Switch Current to A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% ReferenceFigure 1. Representative Schematic DiagramSQRQ2Q1100 IpkOscillatorCTComparator+ VReferenceRegulator12345678 DriveCollectorIpkSenseVCCC omparatorInvertingInputSwitchCollectorSw itchEmitterTimingCapacitorGnd(Bottom View)This device contains 51 active 8D SUFFIXCASE 751 PDIP 8P, P1 SUFFIXCASE 6261818 See detailed ordering and shipping information in the packagedimensions section on page 11 of this data INFORMATIONSee general marking information in the device markingsection on page 11 of this data MARKING INFORMATION1 SwitchCollectorSwitchEmitterTimingCapaci torGndDriverCollectorIpk SenseVCCC omparatorInvertingInput(Top View)

3 2345678 PIN , MC33063A, NCV33063 RATINGSR atingSymbolValueUnitPower Supply VoltageVCC40 VdcComparator Input Voltage RangeVIR to + 40 VdcSwitch Collector VoltageVC(switch)40 VdcSwitch Emitter Voltage (VPin 1 = 40 V)VE(switch)40 VdcSwitch Collector to Emitter VoltageVCE(switch)40 VdcDriver Collector VoltageVC(driver)40 VdcDriver Collector Current (Note 1)IC(driver)100mASwitch Dissipation and Thermal CharacteristicsPlastic Package, P, P1 SuffixTA = 25 ResistanceR JA100 C/WSOIC Package, D SuffixTA = 25 CPD625mWThermal ResistanceR JA160 C/WOperating Junction TemperatureTJ+150 COperating Ambient Temperature RangeTA CMC34063A 0 to +70MC33063AV, NCV33063A 40 to +125MC33063A 40 to + 85 Storage Temperature RangeTstg 65 to +150 C1.

4 Maximum package power dissipation limits must be ESD data available upon NCV prefix is for automotive and other applications requiring site and change , MC33063A, NCV33063 CHARACTERISTICS (VCC = V, TA = Tlow to Thigh [Note 4], unless otherwise specified.)CharacteristicsSymbolMinTypMa xUnitOSCILLATORF requency (VPin 5 = 0 V, CT = nF, TA = 25 C)fosc243342kHzCharge Current (VCC = V to 40 V, TA = 25 C)Ichg243542 ADischarge Current (VCC = V to 40 V, TA = 25 C)Idischg140220260 ADischarge to Charge Current Ratio (Pin 7 to VCC, TA = 25 C) Current Limit Sense Voltage (Ichg = Idischg, TA = 25 C)Vipk(sense)250300350mVOUTPUT SWITCH (Note 5)Saturation Voltage, Darlington Connection(ISW = A, Pins 1, 8 connected)VCE(sat) Voltage (Note 6)(ISW = A, RPin 8 = 82 to VCC, Forced 20)VCE(sat) Current Gain (ISW = A, VCE = V, TA = 25 C)hFE5075 Collector Off State Current (VCE = 40 V)IC(off)

5 ACOMPARATORT hreshold VoltageTA = 25 CTA = Tlow to Voltage Line Regulation (VCC = V to 40 V)MC33063A, MC34063 AMC33063AV, NCV33063 ARegline Bias Current (Vin = 0 V)IIB 20 400nATOTAL DEVICES upply Current (VCC = V to 40 V, CT = nF, Pin 7 = VCC,VPin 5 > Vth, Pin 2 = Gnd, remaining pins open)ICC Tlow = 0 C for MC34063A, 40 C for MC33063A, AV, NCV33063 AThigh = +70 C for MC34063A, + 85 C for MC33063A, +125 C for MC33063AV, NCV33063A5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as If the output switch is driven into hard saturation (non Darlington configuration) at low switch currents ( 300 mA) and high driver currents( 30 mA), it may take up to s for it to come out of saturation.

6 This condition will shorten the off time at frequencies 30 kHz, and ismagnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If anon Darlington configuration is used, the following output drive condition is recommended:Forced of output switch :ICoutputICdriver mA * 10* The 100 resistor in the emitter of the driver device requires about mA before the output switch , MC33063A, NCV33063 = VPin 7 = VCCPin 5 = GndTA = 25 CtoffFigure 2. Output Switch On Off Time versusOscillator Timing CapacitorFigure 3. Timing Capacitor 10CT, OSCILLATOR TIMING CAPACITOR (nF), OUTPUT SWITCH ON OFF TIME ( s)on-off t10 s/DIV, OSCILLATOR VOLTAGE (V)OSC200 mV/DIVVVCC = VPin 7 = VCCPin 2 = GndPins 1, 5, 8 = OpenCT = nFTA = 25 4.

7 Emitter Follower Configuration OutputSaturation Voltage versus Emitter CurrentFigure 5. Common Emitter Configuration OutputSwitch Saturation Voltage versusCollector CurrentFigure 6. Current Limit Sense Voltageversus TemperatureFigure 7. Standby Supply Current versusSupply , SATURATION VOLTAGE (V)CE(sat)IE, EMITTER CURRENT (A)VVCC = V Pins 1, 7, 8 = VCCPins 3, 5 = GndTA = 25 C(See Note 7), SATURATION VOLTAGE (V)CE(sat) , COLLECTOR CURRENT(A)VDarlington ConnectionForced = 20-55-250255075100125, CURRENT LIMIT SENSE VOLTAGE (V)IPK(sense)TA, AMBIENT TEMPERATURE ( C)VVCC = VIchg = , SUPPLY CURRENT (mA)CCVCC, SUPPLY VOLTAGE (V)ICT = nF Pin 7 = VCCPin 2 = = V Pin 7 = VCCPins 2, 3, 5 = GndTA = 25 C(See Note 7)7. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as , MC33063A, NCV33063 V100+ kR247 kSQRQ2Q1 IpkOscCTVCC+ VRefReg12341N5819CT1500pF330CO+Vout28 V/175 H+100 Optional FilterTestConditionsResultsLine RegulationVin = V to 16 V, IO = 175 mA30 mV = RegulationVin = 12 V, IO = 75 mA to 175 mA10 mV = RippleVin = 12 V, IO = 175 mA400 mVppEfficiencyVin = 12 V, IO = 175 Ripple With Optional FilterVin = 12 V, IO = 175 mA40 mVppFigure 8.

8 Step Up ConverterMC34063A, MC33063A, NCV33063 External NPN Switch9b. External NPN Saturated Switch(See Note 8)876 RscVin12 VoutRR 0 for constant Vin8. If the output switch is driven into hard saturation (non Darlington configuration) at low switch currents ( 300 mA) and high driver currents( 30 mA), it may take up to s to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnifiedat high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If anon Darlington configuration is used, the following output drive condition is 9. External Current Boost Connections for IC Peak Greater than AMC34063A, MC33063A, NCV33063 V/500 HVout+100 Optional V100+ kSQRQ2Q1 IpkOscCTVCC+ +5L1N5819220 HTestConditionsResultsLine RegulationVin = 15 V to 25 V, IO = 500 mA12 mV = RegulationVin = 25 V, IO = 50 mA to 500 mV = RippleVin = 25 V, IO = 500 mA120 mVppShort Circuit CurrentVin = 25 V, RL = AEfficiencyVin = 25 V, IO = 500 Ripple With Optional FilterVin = 25 V, IO = 500 mA40 mVppFigure 10.

9 Step Down Converter11a. External NPN Switch11b. External PNP Saturated Switch876 RscVin12 Vout876 RscVin12 VFigure 11. External Current Boost Connections for IC Peak Greater than AMC34063A, MC33063A, NCV33063 VRefRegVout-12 V/100 H+100 Optional V to V100+ +1500pF+-1N58191000 f+88 HVCCCOLTestConditionsResultsLine RegulationVin = V to V, IO = 100 mV = RegulationVin = V, IO = 10 mA to 100 V = RippleVin = V, IO = 100 mA500 mVppShort Circuit CurrentVin = V, RL = 910 mAEfficiencyVin = V, IO = 100 Ripple With Optional FilterVin = V, IO = 100 mA70 mVppFigure 12. Voltage Inverting Converter13a. External NPN Switch 13b. External PNP Saturated Switch876 Vin12 Vout876 Vin12 VoutFigure 13. External Current Boost Connections for IC Peak Greater than AMC34063A, MC33063A, NCV33063 (Top view, copper foil as seen through the board from the component side)(Top View, Component Side)*Optional 14.

10 Printed Circuit Board and Component Layout(Circuits of Figures 8, 10, 12)MC34063 AMC34063 AMC34063 AINDUCTOR DATAC onverterInductance ( H)Turns/WireStep Up17038 Turns of #22 AWGStep Down22048 Turns of #22 AWGV oltage Inverting8828 Turns of #22 AWGAll inductors are wound on Magnetics Inc. 55117 toroidal , MC33063A, NCV33063 UpStep DownVoltage Invertington/toffVout VF Vin(min)Vin(min) VsatVout VFVin(min) Vsat Vout|Vout| VFVin Vsat(ton + toff)1f1f1ftoffton tofftontoff 1ton tofftontoff 1ton tofftontoff 1ton(ton + toff) toff(ton + toff) toff(ton + toff) x 10 5 x 10 5 x 10 5 tonIpk(switch)2 Iout(max) tontoff 1 2 Iout(max)2 Iout(max) tontoff 1 (switch) (switch) (switch)L(min) (Vin(min) Vsat)Ipk(switch) ton(max) (Vin(min) Vsat Vout)Ipk(switch) ton(max) (Vin(min) Vsat)Ipk(switch) ton(max)CO9 IouttonVripple(pp)Ipk(switch)(ton toff)8 Vripple(pp)9 IouttonVripple(pp)Vsat = Saturation voltage of the output = Forward voltage drop of the output following power supply characteristics must be chosen.