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Preliminary

RT9226B

Synchronous PWM Step-down DC/DC Converter Controller

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.

The RT9226B 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 supply and components in power on

duration. The 200 kHz operating frequency and high

speed PWM control loop with Synchronous N-

channel

speed.

MOSFET

Other

driver

provide

output

optimized

compromise between efficiency, cost, and response

features

include

voltage

monitoring for power good indication and over

voltage protection.

Features

Synchronous N-channel MOSFET Driver

High Efficiency

Fast

Response

with

200kHz

Operating

Frequency

Adjustable Current Limit by Sensing MOSFET

R

DS(ON)

,

Resistor

Shutdown Function

Power Good Indication Output and Over-

voltage Protection

without

Extra

Current

Sensing

Applications

Low Cost CPU Power Supply

Motherboard I/O Power Supply

Add-On Card Power Supply

DDR SDRAM Bus Terminator Power Supply

Pin Configurations

Part Number

RT9226BCS

(Plastic SOP-14)

Pin Configurations

TOP VIEW

1

2

3

4

5

6

PGNDH 7

VSEN

OCSET

SS

FB

EN

GND

14

13

12

11

10

9

8

VCC

LGATE

PGNDL

BOOT

UGATE

PHASE

PGOOD

Ordering Information

RT9226B

Package type

S : SOP-14

Operating temperature range

C: Commercial standard

DS9226B-01 May 2001

www.richtek-ic.com.tw

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