General Description

The RT9226B is a low cost, high-efficiency voltage mode PWM controller for motherboard power supply application. Synchronous N-channel MOSFET driver, short-circuit protection, and soft start function are

integrated in a single chip. A simple high power buck regulator with shutdown function can be implemented with minimum external components.

Features

Synchronous N-channel MOSFET Driver

High Efficiency

Fast Response with 200kHz Operating Frequency

Adjustable Current Limit by Sensing MOSFET RDS(ON), without Extra Current Sensing Resistor

Shutdown Function

Power Good Indication Output and Over voltage Protection

Applications

Low Cost CPU Power Supply

Motherboard I/O Power Supply

Add-On Card Power Supply

DDR SDRAM Bus Terminator Power Supply