[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