Details, datasheet, quote on part number: MC34063AP1
CategoryPower Management => DC-DC Converters => DC-DC Switching => Converters
Description1.5A, Step-up/down/inverting Switching Regulator , Package: Pdip, Pins=8
CompanyON Semiconductor
DatasheetDownload MC34063AP1 datasheet
Cross ref.Similar parts: MC34063ACN, MC34063AP, LM2578A, LM2594, LM2594HV, LM2597, LM2597HV, LM2671, LM2672, LM2674
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Features, Applications

The MC34063A Series is a monolithic control circuit containing the primary functions required for DC­to­DC converters. These devices consist 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 specifically designed to be incorporated in Step­Down and Step­Up and Voltage­Inverting applications with a minimum number of external components. Refer to Application Notes AN920A/D and AN954/D for additional design information.

Operation from 40 V Input Low Standby Current Limiting Output Switch Current 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference

Switch Collector Switch Emitter Timing Capacitor Gnd Driver Collector Ipk Sense VCC Comparator Inverting Input

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

Ipk Oscillator CT VCC 6 Comparator + Comparator 5 Inverting Input 1.25 V Reference Regulator 4 (Bottom View) 3

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

Rating Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPin 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Power Dissipation and Thermal Characteristics Plastic Package, P, P1 Suffix = 25°C Thermal Resistance SOIC Package, D Suffix = 25°C Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range NCV33063A MC33063A Storage Temperature Range 1. 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. Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW Value ­0.3 to Unit Vdc mA A

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

Characteristics OSCILLATOR Frequency (VPin = 1.0 nF, = 25°C) Charge Current (VCC = 25°C) Discharge Current (VCC = 25°C) Discharge to Charge Current Ratio (Pin 7 to VCC, = 25°C) Current Limit Sense Voltage (Ichg = Idischg, = 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 82 to VCC, Forced 20) DC Current Gain (ISW 1.0 A, VCE = 25°C) Collector Off­State Current (VCE 40 V) COMPARATOR Threshold Voltage TA = Tlow to Thigh Threshold Voltage Line Regulation (VCC MC33063AV, NCV33063A Input Bias Current (Vin 0 V) TOTAL DEVICE Supply Current (VCC = 1.0 nF, Pin 7 = VCC, VPin 5 > Vth, Pin 2 = Gnd, remaining pins open) ICC 4.0 mA Vth 1.225 1.21 Regline ­ IIB mV V VCE(sat) hFE IC(off) ­ µA fosc Ichg Idischg Idischg/Ichg Vipk(sense) kHz ­ mV Symbol Min Typ Max Unit

4. Tlow = 0°C for MC34063A, ­40°C for MC33063A, AV, NCV33063A Thigh = +70°C for MC34063A, +85°C for MC33063A, +125°C for 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 (non­Darlington configuration) at low switch currents ( 300 mA) and high driver currents ( 30 mA), it may take 2.0 µs for it to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non­Darlington configuration is used, the following output drive condition is recommended: IC output w 10 Forced b of output switch : IC driver mA * The 100 resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.


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