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IR3638SPBF

HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS

International Rectifier 

Data Sheet No.PD94724

IR3638SPbF

HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER

FOR TRACKING APPLIACTIONS

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

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.

12V

5V

C1

C2

C3

Vcc

Vc

HDrv

V_CPUCore

C6

D1

Vp / Enable

LDrv

SS

PGnd

Fb

Comp

C4

Gnd

C5

R3

Q1

L1

Q2

R1

R2

Vout

C7

3/19/07

Fig. 1: Typical Application Circuit

ORDERING INFORMATION

PKG PACKAGE

DESIG DESCRIPTION

S

IR3638STRPbF

PIN

PARTS

COUNT PER TUBE

14

----

PARTS

PER REEL

2500

T&R

ORIANTAION

Figure A

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