MAX668/MAX669 is a constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controller designed for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%
The MAX668 and MAX669 are constant‑frequency, current‑mode PWM controllers designed for a wide range of DC‑DC conversion topologies, including boost, SEPIC, flyback and isolated output configurations. They operate from a 1.8 V to 28 V input range and feature an adjustable oscillator (100 kHz‑500 kHz), soft‑start, shutdown control and Maxim’s proprietary Idle Mode for high efficiency at light loads.
The datasheet provides absolute maximum ratings, detailed electrical characteristics, pin descriptions, a comparison of the two devices, typical operating curves and package dimensions. Ordering information and contact details for Maxim Integrated Products are also included.
| Input Voltage Range | 1.8 V to 28 V |
|---|---|
| Shutdown Supply Current (SYNC/SHDN = GND, Vcc = 28 V) | 3.5 µA |
| Oscillator Frequency Range | 100 kHz to 500 kHz |
| Package Type | 10‑pin MAX package |
The MAX669 requires a minimum start‑up voltage of 1.8 V.
Both devices are available in a 10‑pin MAX package.
The oscillator can be set between 100 kHz and 500 kHz.