RT9226
March, 2000
PWM Step-down DC/DC Converter Controller
General Description
Features
The RT9226 is a low cost, high-efficiency voltage-mode PWM controller for motherboard power supply application.
High-side 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.
The RT9226 provides current-limit protection by monitoring the voltage drop across N-channel MOSFET in over current condition, therefore, eliminates the current sensing resistor and minimizes the efficiency loss.
The soft start function reduces the stress on power su...