MC34063A, MC33063ADC-to-DC Converter Control Circuits
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
8
1SOEIAJ–8M SUFFIXCASE 968
PIN CONNECTIONS
SwitchCollectorSwitchEmitter
DriverCollectorIpk SenseVCCComparatorInvertingInput
1234
(Top View)
8765
Representative Schematic Diagram
Drive8Collector
SQIpkSense
7R100Q2Q12SwitchEmitter1SwitchCollector
TimingCapacitor
Gnd
ORDERING INFORMATION
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)
3TimingCapacitor
DEVICE MARKING INFORMATION
See general marking information in the device markingsection on page 11 of this data sheet.
Gnd
This device contains 51 active transistors.
© Semiconductor Components Industries, LLC, 20001
August, 2000 – Rev. 6
Publication Order Number:
MC34063A/D
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MC34063A, MC33063A
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 RangeMC34063AMC33063AVMC33063AStorage Temperature Range1.Maximum package power dissipation limits must be observed.2.ESD data available upon request.
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/WW°C/W°C°CTstg–65 to +150°Chttp://onsemi.com
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MC34063A, MC33063A
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 3.], 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 4.)Saturation Voltage, Darlington Connection(ISW = 1.0 A, Pins 1, 8 connected)Saturation Voltage (Note 5.)(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, MC34063AMC33363AVInput 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–mVSymbolMinTypMaxUnitReglineIIB3.Tlow = 0°C for MC34063A, –40°C for MC33063A, AV Thigh = +70°C for MC34063A, +85°C for MC33063A, +125°C for MC33063AV4.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5.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
Forcedbofoutputswitch:w10
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
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 1. 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 6.)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 2. Timing Capacitor Waveform
Darlington ConnectionVCC = 5.0 V Pin 7 = VCCPins 2, 3, 5 = GndTA = 25°C(See Note 6.)Forced β = 2000.20.40.60.81.01.2IC, COLLECTOR CURRENT(A)1.41.6Figure 3. Emitter Follower Configuration OutputSaturation Voltage versus Emitter CurrentVIPK(sense), CURRENT LIMIT SENSE VOLTAGE (V)Figure 4. 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 5. Current Limit Sense Voltage
versus TemperatureFigure 6. Standby Supply Current versus
Supply Voltage
6.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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MC34063A, MC33063A
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 7. Step–Up Converter
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MC34063A, MC33063A
81Vout81RVout7RscVin62RscVin726R ³ 0 for constant VinFigure 8. External Current Boost Connections for IC Peak Greater than 1.5 A
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 7.)
7.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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MC34063A, MC33063A
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 9. Step–Down Converter
8118V7RscVin62VoutRscVin726Figure 10. External Current Boost Connections for IC Peak Greater than 1.5 A
10a. External NPN Switch
10b. External PNP Saturated Switch
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MC34063A, MC33063A
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 11. Voltage Inverting Converter
8181Vout72Vout72Vin6Vin6Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A
12a. External NPN Switch
12b. External PNP Saturated Switch
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MC34063A, MC33063A
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 13. Printed Circuit Board and Component Layout
(Circuits of Figures 7, 9, 11)
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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MC34063A, MC33063A
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)(Vin(min)II*Vsat*Vout)pk(switch)Ǔton(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 14. Design Formula Table
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MC34063A, MC33063A
ORDERING INFORMATIONDeviceMC33063ADMC33063ADR2MC33063AP1MC33063AVDMC33063AVDR2MC33063AVPMC34063ADMC34063ADR2MC34063AP1MC34063BDMC34063BDR2MC34063AMMC34063AMELMC34063AML1MC34063AML2MC34063AMR1MC34063AMR2PackageSO–8SO–8DIP–8SO–8SO–8DIP–8SO–8SO–8DIP–8SO–8SO–8SOEIAJ–8SOEIAJ–8SOEIAJ–8SOEIAJ–8SOEIAJ–8SOEIAJ–8Shipping98 Units / Rail2500 Units / Tape & Reel50 Units / Rail98 Units / Rail2500 Units / Tape & Reel50 Units / Rail98 Units / Rail2500 Units / Tape & Reel50 Units / Rail98 Units / Rail2500 Units / Tape & Reel94 Units / Rail1000 Units / Tape & Reel1000 Units / Tape & Reel2000 Units / Tape & Reel1000 Units / Tape & Reel2000 Units / Tape & ReelMARKING DIAGRAMS
PDIP–8P, P1 SUFFIXCASE 6268
3x063AP1AWLYYWW1
PDIP–8P, P1 SUFFIXCASE 6268
33063AVPAWLYYWW1
xzAWL, LYY, YWW, W
18
SO–8D SUFFIXCASE 751SO–8D SUFFIXCASE 7518
8
34063ALYWz1
1
SOEIAJ–8M SUFFIXCASE 968
3x063ALYWzM063AALYW
=3 or 4
= A denotes AD suffixJ denotes BD suffix=Assembly Location=Wafer Lot=Year
=Work Week
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MC34063A, MC33063A
PACKAGE DIMENSIONS
PDIP–8P, P1 SUFFIXPLASTIC PACKAGECASE 626–05ISSUE K
85–B–14FNOTE 2–A–LNOTES:
1.DIMENSION L TO CENTER OF LEAD WHENFORMED PARALLEL.
2.PACKAGE CONTOUR OPTIONAL (ROUND ORSQUARE CORNERS).
3.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.
DIMABCDFGHJKLMNMILLIMETERSMINMAX9.4010.166.606.104.453.940.510.381.781.022.54 BSC1.270.760.300.203.432.927.62 BSCĊ 10°0.761.01INCHESMINMAX0.3700.4000.2400.2600.1550.1750.0150.0200.0400.0700.100 BSC0.0300.0500.0080.0120.1150.1350.300 BSCĊ 10°0.0300.040C–T–SEATINGPLANEJNDHG0.13 (0.005)MKTAMMBMSO–8D SUFFIX
PLASTIC PACKAGECASE 751–06ISSUE T
A8D5CEH140.25MBMhBCeASEATINGPLANEX 45_NOTES:
1.DIMENSIONING AND TOLERANCING PER ASMEY14.5M, 1994.
2.DIMENSIONS ARE IN MILLIMETER.
3.DIMENSION D AND E DO NOT INCLUDE MOLDPROTRUSION.
4.MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.5.DIMENSION B DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESSOF THE B DIMENSION AT MAXIMUM MATERIALCONDITION.
DIMAA1BCDEeHhLqMILLIMETERSMINMAX1.351.750.100.250.350.490.190.254.805.003.804.001.27 BSC5.806.200.250.500.401.250 7 __q0.10A1B0.25MLCBSAShttp://onsemi.com
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MC34063A, MC33063A
SOEIAJ–8M SUFFIX
PLASTIC PACKAGECASE 968–01ISSUE O
85LEQ1EHEM°14LDETAIL PZDePANOTES:1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.2.CONTROLLING DIMENSION: MILLIMETER3.DIMENSION D AND E DO NOT INCLUDE MOLDFLASH OR PROTRUSIONS AND ARE MEASURED ATTHE PARTING LINE. MOLD FLASH ORPROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)PER SIDE.4.TERMINAL NUMBERS ARE SHOWN FORREFERENCE ONLY.5.THE LEAD WIDTH DIMENSION (b) DOES NOTINCLUDE DAMBAR PROTUSION. ALLOWABLEDAMBAR PROTRUSION SHALL BE 0.08 (0.003)TOTAL IN EXCESS OF THE LEAD WIDTHDIMENSION AT MAXIMUM MATERIAL CONDITION.DAMBAR CANNOT BE LOCATED ON THE LOWERRADIUS OR THE FOOT MINIMUM SPACE BETWEENPROTRUSIONS AND ADJACENT LEAD TO BE 0.46(0.018).DIMAA1bcDEeHELLEMQ1ZMILLIMETERSINCHESMINMAXMINMAX--- 2.05--- 0.0810.050.200.0020.0080.350.500.0140.0200.180.270.0070.0115.105.500.2010.2175.105.450.2010.2151.27 BSC0.050 BSC7.408.200.2910.3230.500.850.0200.0331.101.500.0430.0590 10 0 10 °°°°0.700.900.0280.035--- 0.94--- 0.037b0.13 (0.005)MA1c0.10 (0.004)http://onsemi.com
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ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changeswithout further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particularpurpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/orspecifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must bevalidated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applicationsintended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury ordeath may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and holdSCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonableattorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claimalleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
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