IRU3038CFTR International Rectifier Corp., IRU3038CFTR Datasheet

IRU3038CFTR

Manufacturer Part Number

IRU3038CFTR

Description

Manufacturer

International Rectifier Corp.

Datasheet

1.IRU3038CFTR.pdf (18 pages)

Specifications of IRU3038CFTR

Case

TSSOP14

Date_code

2003

Current page: 1 of 18
Download datasheet (139Kb)

FEATURES

APPLICATIONS

TYPICAL APPLICATION

PACKAGE ORDER INFORMATION

Rev. 2.0

09/12/02

Synchronous Controller in 14-Pin Package

Operating with single 5V or 12V supply voltage

200KHz to 400KHz operation set by an external

resistor

Soft-Start Function

Fixed Frequency Voltage Mode

500mA Peak Output Drive Capability

Uncommitted Error Amplifier available for DDR

voltage tracking application

1.25V Reference Voltage

Protects the output when control FET is shorted

DDR memory source sink Vtt application

Low cost on-board DC to DC such as

5V to 3.3V, 2.5V or 1.8V

Graphic Card

Hard Disk Drive

Memory

(2.5V)

DDR

DDQ

2200pF

0.1uF

33K

0.1uF

Figure 1 - Typical application of IRU3038 when Vtt tracks the V

FOR TERMINATION POWER SUPPLY APPLICATIONS

0 To 70

Comp

REF

(°C)

IRU3038

Vcc

Gnd

IRU3038CF

IRU3038CS

PGnd

HDrv

LDrv

DEVICE

SYNCHRONOUS PWM CONTROLLER

12V

1uF

BAT54

or 1N4148

www.irf.com

DESCRIPTION

The IRU3038 controller IC is designed to provide a low

cost synchronous Buck regulator for voltage tracking

applications such DDR memory and general purpose

on-board DC to DC converter. Modern micro processors

combined with DDR memory, need high-speed bandwidth

data bus which requires a particular bus termination volt-

age. This voltage will be tightly regulated to track the

half of chipset voltage for best performance. The IRU3038

together with dual N-channel MOSFETs such as IRF7313,

provide a low cost solution for such applications. This

device features a programmable frequency set from

200KHz to 400KHz, under-voltage lockout for both Vcc

and Vc supplies, an external programmable soft-start

function as well as output under-voltage detection that

latches off the device when an output short is detected.

14-Pin Plastic TSSOP (F)

14-Pin Plastic SOIC NB (S)

1/2 of IRF7313

PACKAGE

D03316P-103, 10uH, 3.9A

10TPB100M,

100uF, 55m

1uH

PRELIMINARY DATA SHEET

DDQ

Data Sheet No. PD94250

47uF

2x 6TPB150M,

150uF, 55m

IRU3038

Vtt

1.25V @ 3A

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