[Richtek]

General Description

The RT9226A is a low cost, high-efficiency voltagemode 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 Overvoltage Protection

Applications

• Low Cost CPU Power Supply

• Motherboard I/O Power Supply

• Add-On Card Power Supply

• DDR SDRAM Bus Terminator Power Supply