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Preliminary

RT9205/A

Dual Regulators - Synchronous Buck PWM DC-DC and

Linear Controller

General Description

The RT9205/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 14-pin package.

The RT9205/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 RT9205/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

RT9205/ACS

(Plastic SOP-14)

Pin Configurations

TOP VIEW

LGATE

1

PGND

2

GND

3

VCC

4

DRV

5

FBL

6

NC

7

14

13

12

11

10

9

8

Applications

PC Motherboard

Cable Modems, Set-Top-Box, and XDSL 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

UGATE

BOOT

NC

NC

NC

FB

NC

Ordering Information

RT9205/A

Package Type

S : SOP-14

Operating Temperature Range

C : Commercial Standard

UVP : Hiccup Mode

UVP : Latch Mode

DS9205/A-03 May 2003

www.richtek.com

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