IR3638SPBF datasheet(1/15 Pages) IRF | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS

1 page

IR3638SPbF

3/19/07

HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER

FOR TRACKING APPLIACTIONS

Description

The IR3638 controller IC is designed to provide a

simple synchronous Buck regulator for on-board

DC to DC applications in a 14-pin SOIC. The

IR3638 is designed specifically for tracking

applications by providing the track input.

The IR3638 operates at a fixed internal 400kHz

switching frequency allowing the use of small

external components.

The device features a programmable soft start set

by an external capacitor, under-voltage lockout

and output under-voltage detection that latches

off the device when an output short is detected.

Features

•

Power up Sequencing / Tracking

•

Enable Input

•

Internal 400kHz Oscillator

•

Programmable Soft-Start

•

Fixed Frequency Voltage Mode

•

Output Voltage as low as 0.6V

Applications

•

Tracking Applications

•

Game Consoles

•

Computing Peripheral Voltage Regulators

•

Graphics Cards

•

General DC/DC Converters

Fig. 1: Typical Application Circuit

ORDERING INFORMATION

PKG

PACKAGE

PARTS

T&R

DESIG DESCRIPTION

COUNT PER TUBE

PER REEL

ORIANTAION

IR3638STRPbF

----

2500

Figure A

Vcc

HDrv

LDrv

Gnd

Comp

Vp / Enable

Vout

12V

PGnd

V_CPUCore

Data Sheet No.PD94724

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