The MC34063 is a monolithic Control Circuit which delivers the main functions for DC-to-DC voltage converting. The device contains an internal temperature compensated reference, comparator and duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch. Output voltage is adjustable through two external resistors with 2% reference accuracy. Employing a minimum number of external components, the device is designed for step-down, step-up and voltage-inverting applications.