1.5A LOW-NOISE PWM STEP-DOWN REGULATOR
[GENERAL DESCRIPTION
The 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