The MAX1692 is a low-noise, pulse-width-modulated (PWM), DC-DC step-down converter. It is suitable for powering logic and transmitters in small wireless systems. The device features an internal synchronous rectifier for high efficiency and does not require an external Schottky diode. It has excellent noise characteristics and fixed-frequency operation for easy post-filtering. The MAX1692 is ideally suited for Li-Ion battery applications and can also be used for +3V or +5V fixed input applications. It operates in four modes: Forced PWM mode, Synchronizable PWM mode, Idle Mode™ (PWM/PFM), and Shutdown mode. The MAX1692 can deliver over 600mA of output current, with an adjustable output voltage range from 1.25V to VIN and an input range from +2.7V to +5.5V. Other features include high efficiency, low dropout voltage, and a 1.2%-accurate 1.25V reference.