General Description

The RT8057 is a high efficiency Pulse-Width-Modulated (PWM) step-down DC/DC converter, capable of delivering 1A output current over a wide input voltage range from 2.7V to 5.5V. The RT8057 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs, hand held devices, game console and related accessories.

Features

2.7V to 5.5V Wide Input Operation Range

2.25MHz Fixed-Frequency PWM Operation

Up to 1A Output Current

Up to 90% Efficiency

0.6V Reference Allows Low Output Voltage

Internal Soft-Start

No Schottky Diode Required

Internal Compensation to Reduce External Components

Low Dropout Operation : 100% Duty Cycle

RoHS Compliant and Halogen Free

Applications

Portable Instruments

Game Console and Accessories

Microprocessors and DSP Core Supplies

Cellular Phones

Wireless and DSL Modems

PC Cards