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Preliminary

RT9209/A

Synchronous Buck PWM DC-DC with Enable & PGOOD

General Description

The RT9209/A is a single power supply PWM DC-DC

converter controller designed to drive N-Channel

MOSFET in a synchronous buck topology. The IC

integrates the control, output adjustment, monitoring

and protection functions into a small 8-pin package.

The RT9209/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

260kHz/400kHz

oscillator

reduce

the

component size for saving board area.

The RT9209/A future a enable control pin to

shutdown PWM switching and a 90% power good

flag indicator. The FB pin under voltage detection

function monitor the output short circuit which trigger

a three time hiccup sequence to latch off the chip

function.

Features

Operates at 5V

0.8V Internal Reference

Drives Two N-Channel MOSFET

Voltage Mode PWM Control

Fast Transient Response

Fixed 260kHz/400kHz 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

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

Ordering Information

RT9209/A

Package Type

S : SOP-8

Operating Temperature Range

C: Commercial Standard

400kHz

260kHz

Pin Configurations

Part Number

RT9209/ACS

(Plastic SOP-8)

FB 1

VCC 2

LGATE 3

GND 4

Pin Configurations

TOP VIEW

SS

PGOOD

BOOT

UGATE

8

7

6

5

DS9209/A-00 March 2003

www.richtek.com

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