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RT9202

Single Synchronous Buck PWM DC-DC Controller

General Description

The RT9202 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 in a small 8-pin package.

The RT9202 uses a low gain 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 300kHz

oscillator reduces the component size for saving

board space.

The RT9202 features over current protection, over

voltage protection, and under voltage lock-out. The

output current is monitored by sensing the voltage

drop across the MOSFET鈥檚 R

DS(ON)

, which eliminates

the need for a current sensing resistor.

Features

Operate from 5V

0.8V Internal Reference

Drive Two N-channel MOSFET

Voltage Mode PWM Control

Fast Transient Response

Fixed 300kHz Oscillator Frequency

Full 0~100% Duty Cycle

Internal Soft Start

Adaptive Non-overlapping Gate Driver

Over-current Monitor Uses MOSFET R

DS(ON)

Over-voltage Protection Uses Low-side

MOSFET

Pin Configurations

Part Number

RT9202CS

(Plastic SOP-8)

Pin Configurations

TOP VIEW

BOOT

1

UGATE

2

GND

3

LGATE

4

8

7

6

5

PHASE

OCSET

FB

VCC

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

RT9202

Package type

S : SOP-8

Operating temperature range

C: Commercial standard

DS9202-02 August 2002

www.richtek.com

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