The MC34063A Series is a monolithic control circuit containing the
primary functions required for DC–to–DC 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
Step–Down and Step–Up and Voltage–Inverting applications with a
minimum number of external components. Refer to Application Notes
AN920A/D and AN954/D for additional design information.
• Operation from 3.0 V to 40 V Input
• Low Standby Current
• Current Limiting
• Output Switch Current to 1.5 A
• Output Voltage Adjustable
• Frequency Operation to 100 kHz
• Precision 2% Reference

MAXIMUM RATINGS
Rating Symbol Value Unit
Power Supply Voltage VCC 40 Vdc
Comparator Input Voltage Range VIR –0.3 to +40 Vdc
Switch Collector Voltage VC(switch) 40 Vdc
Switch Emitter Voltage (VPin 1 = 40 V) VE(switch) 40 Vdc
Switch Collector to Emitter Voltage VCE(switch) 40 Vdc
Driver Collector Voltage VC(driver) 40 Vdc
Driver Collector Current (Note 1) IC(driver) 100 mA
Switch Current ISW 1.5 A
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
TA = 25°C PD 1.25 W
Thermal Resistance RqJA 100 °C/W
SOIC Package, D Suffix
TA = 25°C PD 625 W
Thermal Resistance RqJA 160 °C/W
Operating Junction Temperature TJ +150 °C
Operating Ambient Temperature Range TA °C
MC34063A 0 to +70
MC33063AV –40 to +125
MC33063A –40 to +85
Storage Temperature Range Tstg –65 to +150 °C