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Data Sheet No. PD94698

IRU3072

20-PIN SYNCHRONOUS PWM CONTROLLER/

3 LDO CONTROLLER

FEATURES

Synchronous Controller plus 3-LDO controllers

Current Limit using MOSFET Sensing

Dual Soft-Start Function allows power sequencing

Single 5V/12V Supply Operation

Programmable Switching Frequency up to 400KHz

Fixed Frequency Voltage Mode

1A Peak Output Drive Capability

DESCRIPTION

The IRU3072 controller IC is designed to provide a low

cost synchronous Buck regulator for on-board DC to DC

converter for multi-output applications. The outputs can

be programmed as low as 0.8V for low voltage applica-

tions.

The IRU3072 features dual soft-starts which allows power

sequencing between outputs.

Over current limit is provided by using external MOSFET's

on-resistance for optimum cost and performance.

This device features a programmable frequency set from

200KHz to 400KHz, under-voltage lockout for all input

supplies, dual external programmable soft-start functions

as well as output under-voltage detection that latches

off the device when an output short is detected.

APPLICATIONS

Graphic Card

DDR memory source sink V

TT

application

Applications with Multiple Outputs

Low cost on-board DC to DC such as

5V to 3.3V, 2.5V or 1.8V

Hard Disk Drive

TYPICAL APPLICATION

3.3V

Q1

V

SEN33

/ SDB

R1

C2

10uF

2.15K

R2

1K

Vcc

C1

1uF

+5V

Drv2

Fb2

VccLDO

V

OUT2

2.5V

C3

1uF

Q2

V

OUT3

1.8V

C4

10uF

R3

1.25K

R4

1K

Drv3

Fb3

Vc

D1

L1

U1

IRU3072

Drv4

Fb4

HDrv

OCSet

C5

1uF

C6

0.1uF

1uH

C7

2x 47uF,16V

V

IN

=12V

C8

10uF

Q3

V

OUT4

1.5V

C9

10uF

R5

866

V

R6

1K

Q4

IRF7460

R7

6.81K

Q5

IRF7460

L2

1uH

C10 220pF

R8

3.3K

C11

15nF

R9

46.4K

C13

0.1uF

V

OUT1

1.2V @ 8A

C12

3x 330uF, 40m

V

6TPB330M, Poscap

R10

499

V

Comp

Rt

SS1

LDrv

Fb1

PGnd

R11

1K

C14

33nF

SSLDO

Gnd

Figure 1 - Typical application of IRU3072.

PACKAGE ORDER INFORMATION

T

A

(擄C)

0 To 70

Rev. 1.0

3/25/04

DEVICE

IRU3072CH

PACKAGE

20-Pin MLPQ 4x4 (H)

www.irf.com

1

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