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