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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 inStep–Down and Step–Up and Voltage–Inverting applications with a minimum number of external components. Refer to Application NotesAN920A/D and AN954/D for additional design information.
| Pin Number | Pin Name | Description |
| 1 | Switch Collector | Collector pin of Internal transistors (Output Voltage pin) |
| 2 | Switch Emitter | Emitter pin of Internal Transistors |
| 3 | Timing Capacitor | Connect to a capacitor which decides the switching frequency |
| 4 | Ground | Connected to ground |
| 5 | Comparator Inverting Input | Used to set the output voltage |
| 6 | Vcc | Input voltage is fed to this pin |
| 7 | Ipeak Sense | Used to set the output current |
| 8 | Driver Collector | Collector pin of switching transistor |
| Power Supply Voltage | 40Vdc |
| Switch Collector Voltage | 40Vdc |
| Switch Emitter Voltage | 40Vdc |
| Switch Collector to Emitter Voltage | 40Vdc |
| Driver Collector Voltage | 40Vdc |
| Driver Collector Current | 100mA |
| Switch Current | 1.5A |
| Operating Ambient Temperature Range | 0 to +70 |
| L*B*H |
