[Champion]

GENERAL DESCRIPTION

The CM3718 is a low-noise, pulse-width-modulated (PWM), DC-DC step-down converter. It powers logic and transmitters in small wireless systems such as cellular phones, communicating PDAs, and handy-terminals. The device features an internal synchronous rectifier for high efficiency; it requires no external Schottky diode. Excellent noise characteristics and fixed-frequency operation provide easy post-filtering. The CM3718 is ideally suited for Li-lon battery applications. It is also useful for +3V or +5V fixed input applications.

FEATURES

♦ Patent Number #6,452,366

♦ 1.2MHz switching and synchronization

♦ Dynamic output-voltage adjustment from VREF to VIN

♦ 1.5A Guaranteed Output Current

♦ 95% Efficiency

♦ No Schottky Diode Required

♦ External Soft Start

♦ 8-pin PSOP power packages

APPLICATIONS

♦ Cellular Phone

♦ Cordless Phone

♦ PDAs and Handy-Terminals

♦ CPU I/O Supplies

♦ Notebook Chipset Supplies

♦ Battery Operated Devices