General Description

The MAX1692 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 MAX1692 is ideally suited for Li-Ion battery applications. It is also useful for +3V or +5V fixed input applications.

Features

♦ +2.7V to +5.5V Input Range

♦ Adjustable Output from 1.25V to VIN

♦ 600mA Guaranteed Output Current

♦ 95 Efficiency

♦ No Schottky Diode Required

♦ 85µA Quiescent Current

♦ 100 Duty Cycle in Dropout

♦ 750kHz Fixed-Frequency PWM Operation

♦ Synchronizable Switching Frequency

♦ Accurate Reference: 1.25V (±1.2)

♦ Small 10-Pin µMAX Package

Applications

Cellular Phones

CPU I/O Supplies

Cordless Phones

Notebook Chipset Supplies

PDAs and Handy-Terminals

Battery-Operated Devices (1 Li-Ion or 3 NiMH/NiCd)