The MC33063A and MC34063A devices are easy-to-use ICs containing all the primary circuitry needed for building simple DC-DC converters. These devices primarily consist of an internal temperature-compensated reference, a comparator, an oscillator, a PWM controller with active current limiting, a driver, and a high-current output switch. Thus, the devices require minimal external components to build converters in the boost, buck, and inverting topologies.
The MC33063A device is characterized for operation from –40°C to 85°C, while the MC34063A device is characterized for operation from 0°C to 70°C.
| Topology | Boost, Buck, Flyback, Forward, SEPIC |
| Vin (min) (V) | 3 |
| Vin (max) (V) | 40 |
| Vout (min) (V) | 1.25 |
| Vout (max) (V) | 40 |
| Switch current limit (typ) (A) | 1.5 |
| Type | Converter |
| Regulated outputs (#) | 1 |
| Switching frequency (min) (kHz) | 33 |
| Switching frequency (max) (kHz) | 100 |
| Iq (typ) (mA) | 4 |
| Features | Nonsynchronous rectification |
| Duty cycle (max) (%) | 80 |
| Operating temperature range (°C) | -40 to 85 |
| Rating | Catalog |
| PDIP (P) | 8 | 92.5083 mm² 9.81 x 9.43 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| WSON (DRJ) | 8 | 16 mm² 4 x 4 |
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