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)