MC34063

1.5 A, Step-Up/Down/Inverting SwitchingRegulators

The 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.

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81PDIP–8P, P1 SUFFIXCASE 626

•••••••

Operation from 3.0 V to 40 V InputLow Standby CurrentCurrent Limiting

Output Switch Current to 1.5 AOutput Voltage Adjustable

Frequency Operation to 100 kHzPrecision 2% Reference

81

SO–8D SUFFIXCASE 751

PIN CONNECTIONS

SwitchCollectorSwitchEmitterTimingCapacitor

Gnd

DriverCollectorIpk SenseVCCComparatorInvertingInput

1234

(Top View)

8765

Drive8Collector

SQIpkSense

7R100Q2Q11SwitchCollector

ORDERING INFORMATION

2SwitchEmitter

See detailed ordering and shipping information in the packagedimensions section on page 11 of this data sheet.

IpkOscillatorCTVCC

6Comparator+-Comparator5InvertingInput

1.25 VReferenceRegulator4(Bottom View)

3DEVICE MARKING INFORMATION

TimingCapacitor

See general marking information in the device markingsection on page 11 of this data sheet.

Gnd

This device contains 51 active transistors.

Figure 1. Representative Schematic Diagram

© Semiconductor Components Industries, LLC, 20021

April, 2002 – Rev. 10

Publication Order Number:

MC34063A/D

MC34063A, MC33063A, NCV33063A

MAXIMUM RATINGSRatingPower Supply VoltageComparator Input Voltage RangeSwitch Collector VoltageSwitch Emitter Voltage (VPin 1 = 40 V)Switch Collector to Emitter VoltageDriver Collector VoltageDriver Collector Current (Note 1)Switch CurrentPower Dissipation and Thermal CharacteristicsPlastic Package, P, P1 SuffixTA = 25°CThermal ResistanceSOIC Package, D SuffixTA = 25°CThermal ResistanceOperating Junction TemperatureOperating Ambient Temperature RangeMC34063AMC33063AV, NCV33063AMC33063AStorage Temperature Range1.Maximum package power dissipation limits must be observed.2.ESD data available upon request.

3.NCV prefix is for automotive and other applications requiring site and change control.

SymbolVCCVIRVC(switch)VE(switch)VCE(switch)VC(driver)IC(driver)ISWValue40–0.3 to +40404040401001.5UnitVdcVdcVdcVdcVdcVdcmAAPDRθJAPDRθJATJTA1.25100625160+150 0 to +70–40 to +125–40 to +85W°C/WmW°C/W°C°CTstg–65 to +150°Chttp://onsemi.com

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MC34063A, MC33063A, NCV33063A

ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 4], unless otherwise specified.)

CharacteristicsOSCILLATORFrequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)OUTPUT SWITCH (Note 5)Saturation Voltage, Darlington Connection(ISW = 1.0 A, Pins 1, 8 connected)Saturation Voltage (Note 6)(ISW = 1.0 A, RPin 8 = 82 Ω to VCC, Forced β ] 20)DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)Collector Off–State Current (VCE = 40 V)COMPARATORThreshold VoltageTA = 25°CTA = Tlow to ThighThreshold Voltage Line Regulation (VCC = 3.0 V to 40 V)MC33063A, MC34063AMC33063AV, NCV33063AInput Bias Current (Vin = 0 V)TOTAL DEVICESupply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,VPin 5 > Vth, Pin 2 = Gnd, remaining pins open)ICC––4.0mAVthV1.2251.21–––1.25–1.41.4–201.2751.29mV5.06.0–400nAVCE(sat)VCE(sat)hFEIC(off)––50–1.00.45750.011.30.7–100VV–µAfoscIchgIdischgIdischg/IchgVipk(sense)24241405.225033352206.530042422607.5350kHzµAµA–mVSymbolMinTypMaxUnitReglineIIB4.Tlow = 0°C for MC34063A, –40°C for MC33063A, AV, NCV33063AThigh = +70°C for MC34063A, +85°C for MC33063A, +125°C for MC33063AV, NCV33063A

5.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

6.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 2.0 µs for it to come out of saturation. 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:

ICoutput

w10Forcedbofoutputswitch:

ICdriver–7.0mA**The 100 Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.

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MC34063A, MC33063A, NCV33063A

ton-off, OUTPUT SWITCH ONĆOFF TIME ( µ Ăs)1000

VOSC, OSCILLATOR VOLTAGE (V)5002001005020105.02.01.0

0.010.02

toffVCC = 5.0 VPin 7 = VCCPin 5 = GndTA = 25°CtonVCC = 5.0 VPin 7 = VCCPin 2 = Gnd

Pins 1, 5, 8 = OpenCT = 1.0 nFTA = 25°C

10 µs/DIV

0.050.10.20.51.02.0CT, OSCILLATOR TIMING CAPACITOR (nF)

5.010

Figure 2. Output Switch On–Off Time versus

Oscillator Timing Capacitor

1.81.71.61.51.41.31.21.11.000.20.4VCC = 5.0 V Pins 1, 7, 8 = VCCPins 3, 5 = GndTA = 25°C(See Note 7)0.60.81.01.2IE, EMITTER CURRENT (A)1.41.6VCE(sat), SATURATION VOLTAGE (V)VCE(sat), SATURATION VOLTAGE (V)1.11.00.90.80.70.60.50.40.30.20.10Figure 3. Timing Capacitor Waveform

Darlington ConnectionVCC = 5.0 V Pin 7 = VCCPins 2, 3, 5 = GndTA = 25°C(See Note 7)Forced β = 2000.20.40.60.81.01.2IC, COLLECTOR CURRENT(A)1.41.6Figure 4. Emitter Follower Configuration OutputSaturation Voltage versus Emitter CurrentVIPK(sense), CURRENT LIMIT SENSE VOLTAGE (V)Figure 5. Common Emitter Configuration OutputSwitch Saturation Voltage versusCollector Current3.6400380360340320300280260240220200-55

-25

0255075TA, AMBIENT TEMPERATURE (°C)

100

125

ICC, SUPPLY CURRENT (mA)VCC = 5.0 VIchg = Idischg3.22.82.42.01.61.20.80.4005.010CT = 1.0 nF Pin 7 = VCCPin 2 = Gnd15202530VCC, SUPPLY VOLTAGE (V)

3540Figure 6. Current Limit Sense Voltage

versus TemperatureFigure 7. Standby Supply Current versus

Supply Voltage

7.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

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200 mV/DIVMC34063A, MC33063A, NCV33063A

170 µHL8180SQR7Rsc0.22Vin12 V

+6100VCC+-1Q2Q12IpkOscCT3CT1.25 VRefReg4R21500pF1.0 µH+Vout1001N5819Comp.5R12.2 k47 k330+Vout28 V/175 mACOOptional Filter

TestLine RegulationLoad RegulationOutput RippleEfficiencyOutput Ripple With Optional FilterConditionsVin = 8.0 V to 16 V, IO = 175 mAVin = 12 V, IO = 75 mA to 175 mAVin = 12 V, IO = 175 mAVin = 12 V, IO = 175 mAVin = 12 V, IO = 175 mAResults30 mV = ±0.05%10 mV = ±0.017%400 mVpp87.7%40 mVppFigure 8. Step–Up Converter

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MC34063A, MC33063A, NCV33063A

81Vout81RVout7RscVin62RscVin726R ³ 0 for constant VinFigure 9. External Current Boost Connections for IC Peak Greater than 1.5 A

9a. External NPN Switch

9b. External NPN Saturated Switch

(See Note 8)

8.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 2.0 µs 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 recommended.

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6

MC34063A, MC33063A, NCV33063A

8SQR7Rsc0.33Vin25 V

1006+VCC+-1Q2Q12IpkOscCT1N58193LCT470pF1.0 µH+Vout100220 µHComp.1.25 VRefReg5R2R11.2 k3.6 k4470+Vout5.0 V/500 mACOOptional Filter

TestLine RegulationLoad RegulationOutput RippleShort Circuit CurrentEfficiencyOutput Ripple With Optional FilterConditionsVin = 15 V to 25 V, IO = 500 mAVin = 25 V, IO = 50 mA to 500 mAVin = 25 V, IO = 500 mAVin = 25 V, RL = 0.1 ΩVin = 25 V, IO = 500 mAVin = 25 V, IO = 500 mAResults12 mV = ±0.12%3.0 mV = ±0.03%120 mVpp1.1 A83.7%40 mVppFigure 10. Step–Down Converter

8118V7RscVin62VoutRscVin726Figure 11. External Current Boost Connections for IC Peak Greater than 1.5 A

11a. External NPN Switch

11b. External PNP Saturated Switch

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7

MC34063A, MC33063A, NCV33063A

8SQR7Rsc0.24Vin4.5 V to 6.0 V1006+VCC+-1Q2Q12IpkOscCT31.25 VRefReg4R1Vout-12 V/100 mA1000 µf+CO1.0 µHVout

+100+1500pF1N5819L88 µHComp.5R28.2 k953Optional FilterTestLine RegulationLoad RegulationOutput RippleShort Circuit CurrentEfficiencyOutput Ripple With Optional FilterConditionsVin = 4.5 V to 6.0 V, IO = 100 mAVin = 5.0 V, IO = 10 mA to 100 mAVin = 5.0 V, IO = 100 mAVin = 5.0 V, RL = 0.1 ΩVin = 5.0 V, IO = 100 mAVin = 5.0 V, IO = 100 mAResults3.0 mV = ±0.012%0.022 V = ±0.09%500 mVpp910 mA62.2%70 mVppFigure 12. Voltage Inverting Converter

8181Vout72Vout72Vin6Vin6Figure 13. External Current Boost Connections for IC Peak Greater than 1.5 A

13a. External NPN Switch

13b. External PNP Saturated Switch

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8

MC34063A, MC33063A, NCV33063A

5.45′′2.500′′(Top view, copper foil as seen through the board from the component side)

MC34063AMC34063AMC34063A(Top View, Component Side)*Optional Filter.

Figure 14. Printed Circuit Board and Component Layout

(Circuits of Figures 8, 10, 12)

INDUCTOR DATA

ConverterStep–UpStep–DownVoltage–InvertingInductance (µH)17022088Turns/Wire38 Turns of #22 AWG48 Turns of #22 AWG28 Turns of #22 AWGAll inductors are wound on Magnetics Inc. 55117 toroidal core.

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9

MC34063A, MC33063A, NCV33063A

Calculationton/toffStep–UpVout)VV(ton + toff)toffF*Vin(min)Step–DownFV*Vsat*Voutin(min)1foffton)toffton)1toff(ton + toff) – toff4.0 x 10–5 tonVout)VVoltage–Inverting|Vout|)VVF*Vsatin1fton)toffton)1toffin(min)1f*Vsatton)tton)1tofftonCTIpk(switch)2I(ton + toff) – toff4.0 x 10–5 tonout(max)(ton + toff) – toff4.0 x 10–5 ton2Iout(max)ǒton)1toffǓ2Iout(max)ǒton)1toffǓRscL(min)ǒ0.3/Ipk(switch)(V*Vsat)in(min)Ipk(switch)9IouttonVǓton(max)ǒ0.3/Ipk(switch)in(min)II*Vsat*Vout)pk(switch)(VǓton(max)ǒ0.3/Ipk(switch)(V*Vsat)in(min)Ipk(switch)9IouttonVǓton(max)COripple(pp)(t)t)pk(switch)onoff8Vripple(pp)ripple(pp)

Vsat = Saturation voltage of the output switch.VF = Forward voltage drop of the output rectifier.

The following power supply characteristics must be chosen:

Vin – Nominal input voltage.

Vout – Desired output voltage,|Vout|+1.251)R2

R1Iout – Desired output current.

fmin – Minimum desired output switching frequency at the selected values of Vin and IO.

Vripple(pp) – Desired peak–to–peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its

equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect theline and load regulation.

ǒ

ǓNOTE:For further information refer to Application Note AN920A/D and AN954/D.

Figure 15. Design Formula Table

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MC34063A, MC33063A, NCV33063A

ORDERING INFORMATION

DeviceMC33063ADMC33063ADR2MC33063AP1MC33063AVDMC33063AVDR2NCV33063AVDR2*MC33063AVPMC34063ADMC34063ADR2MC34063AP1PackageSO–8SO–8DIP–8SO–8SO–8SO–8DIP–8SO–8SO–8DIP–8Shipping98 Units / Rail2500 Units / Tape & Reel50 Units / Rail98 Units / Rail2500 Units / Tape & Reel2500 Units / Tape & Reel50 Units / Rail98 Units / Rail2500 Units / Tape & Reel50 Units / Rail*NCV33063A: Tlow = –40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control.

MARKING DIAGRAMS

PDIP–8P, P1 SUFFIXCASE 626

8

3x063AP1 AWL YYWW1

18

33063AVP AWL YYWW18

SO–8D SUFFIXCASE 751

3x063ALYWA

xAWL, LYY, YWW, W=====3 or 4

Assembly LocationWafer LotYear

Work Week

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MC34063A, MC33063A, NCV33063A

PACKAGE DIMENSIONS

PDIP–8P, P1 SUFFIXPLASTIC PACKAGECASE 626–05ISSUE L

NOTES:

1.DIMENSION L TO CENTER OF LEAD WHENFORMED PARALLEL.

2.PACKAGE CONTOUR OPTIONAL (ROUND ORSQUARE CORNERS).

3.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.

DIMABCDFGHJKLMNMILLIMETERSMINMAX9.4010.166.106.603.944.450.380.511.021.782.54 BSC0.761.270.200.302.923.437.62 BSC---10 _0.761.01INCHESMINMAX0.3700.4000.2400.2600.1550.1750.0150.0200.0400.0700.100 BSC0.0300.0500.0080.0120.1150.1350.300 BSC---10 _0.0300.04085–B–14FNOTE 2–A–LC–T–SEATINGPLANEJNDKMMTAMHG0.13 (0.005)BMhttp://onsemi.com

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MC34063A, MC33063A, NCV33063A

PACKAGE DIMENSIONS

SO–8D SUFFIX

PLASTIC PACKAGECASE 751–07ISSUE W

–X–A85NOTES:

1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.

2.CONTROLLING DIMENSION: MILLIMETER.3.DIMENSION A AND B DO NOT INCLUDE MOLDPROTRUSION.

4.MAXIMUM MOLD PROTRUSION 0.15 (0.006) PERSIDE.

5.DIMENSION D DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.127 (0.005) TOTAL INEXCESS OF THE D DIMENSION AT MAXIMUMMATERIAL CONDITION.

DIMABCDGHJKMNSMILLIMETERSMINMAX4.805.003.804.001.351.750.330.511.27 BSC0.100.250.190.250.401.270 _8 _0.250.505.806.20INCHESMINMAX0.1890.1970.1500.1570.0530.0690.0130.0200.050 BSC0.0040.0100.0070.0100.0160.0500 _8 _0.0100.0200.2280.244B1S40.25 (0.010)MYM–Y–GKC–Z–HD0.25 (0.010)

MSEATINGPLANENX 45_0.10 (0.004)MJZY

SX

Shttp://onsemi.com

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MC34063A, MC33063A, NCV33063A

Noteshttp://onsemi.com

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MC34063A, MC33063A, NCV33063A

Noteshttp://onsemi.com

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MC34063A, MC33063A, NCV33063A

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PUBLICATION ORDERING INFORMATION

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ON Semiconductor Website: http://onsemi.comFor additional information, please contact your localSales Representative.http://onsemi.com16MC34063A/D