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Preliminary

RT9203/A

Dual Regulators - Synchronous Buck PWM DC-DC and

Linear Controller

General Description

The RT9203/A is a dual-output power controllers

designed for high performance graphics cards and

personal computers. The IC integrates a synchronous

buck controller, a linear controller and protection

functions into a small 8-pin package.

The RT9203/A uses an internal compensated voltage

mode PWM control for simplying design. An internal

0.8V reference allows the output voltage to be

precisely regulated to meet low output voltage

requirement. A fixed 300kHz oscillation frequency

reduces the component size for saving board area.

The RT9203/A also features over voltage protection

(OVP) and under voltage lock-out (UVLO).

Features

Operates at 5V

0.8V Internal Reference

Drives Two N-channel MOSFET

Voltage Mode PWM Control

Fast Transient Response

Fixed 300kHz Oscillator Frequency

Dynamic 0~100% Duty Cycle

Internal PWM Loop Compensation

Internal Soft-Start

Adaptive Non-overlapping Gate Driver

Over-voltage Protection Uses Lower MOSFET

Pin Configurations

Part Number

RT9203/ACS

(Plastic SOP-8)

Pin Configurations

TOP VIEW

BOOT

1

UGATE

2

GND

3

LGATE

4

8

7

6

5

Applications

PC Motherboard

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

Graphic Cards

FB

FBL

DRV

VCC

Ordering Information

RT9203/A

Package Type

S : SOP-8

Operating Temperature Range

C : Commercial Standard

UVP : Hiccup Mode

UVP : Latch Mode

DS9203/A-04 May 2003

www.richtek.com

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