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Preliminary

RT9204/A

Dual Regulators - Standard Buck PWM DC-DC and

Linear Controller

General Description

The RT9204/A is a dual power controllers designed

for high performance graphics cards and computer

applications. The IC integrates a standard buck

controller, a linear regulator driver and protection

functions into a small 8-pin package.

The RT9204/A uses an internal compensated voltage

mode PWM control for simple application design. An

internal 0.8V reference allows the output voltage to

be precisely regulated to low voltage requirement. A

fixed 600kHz oscillator reduce the component size

for saving board area.

The RT9204/A protects the converter and regulator

by monitoring the output under voltage.

Features

Operate from 5V

0.8V Internal Reference

Voltage Mode PWM Control

Fast Transient Response

Fixed 600kHz Oscillator Frequency

Full 0~100% Duty Cycle

Internal Soft Start

Internal PWM Loop Compensation

Pin Configurations

Part Number

RT9204/ACS

(Plastic SOP-8)

Pin Configurations

TOP VIEW

GND

1

VCC

2

8

7

6

5

UGATE

BOOT

SD

FB

Applications

Motherboard Power Regulation for Computers

Subsystems Power Supplies

Cable Modems, Set Top Box, and DSL Modems

DSP and Core Communications Processor Supplies

Memory Power Supplies

Personal Computer Peripherals

Industrial Power Supplies

5V-Input DC-DC Regulators

Low Voltage Distributed Power Supplies

DRV

3

FBL

4

Ordering Information

RT9204/A

Package Type

S : SOP-8

Operating Temperature Range

C : Commercial Standard

UVP : Hiccup Mode

UVP : Latch Mode

DS9204/A-02 May 2003

www.richtek.com

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