IRU3048

1

Rev. 1.7

09/12/02

www.irf.com

TYPICAL APPLICATION

DESCRIPTION

The IRU3048 IC combines a Dual synchronous Buck

controller and a linear regulator controller, providing a

cost-effective, high performance and flexible solution for

multi-output applications. The Dual synchronous con-

troller is configured as 2-independent PWM controller.

IRU3048 provides a separate adjustable output by driv-

ing a switch as a linear regulator. This device features an

internal 200KHz oscillator, under-voltage lockout for all

input supplies, an external programmable soft start func-

tion as well as output under-voltage detection that latches

off the device when an output short is detected.

Dual Synchronous Controller in 16-Pin Package

with 180

8 out-of-phase operation

LDO Controller with 40mA drive

Configured as 2-Independent PWM Controller

Flexible, Same or Separate Supply Operation

Operation from 4V to 25V Input

Internal 200KHz Oscillator

Soft-Start controls all outputs

Fixed Frequency Voltage Mode

500mA Peak Output Drive Capability

Programmable Outputs

PACKAGE ORDER INFORMATION

FEATURES

DUAL SYNCHRONOUS PWM CONTROLLER

CIRCUITRY AND LDO CONTROLLER

APPLICATIONS

DEVICE

PACKAGE

0 To 70

IRU3048CF

16-Pin TSSOP (F)

0 To 70

IRU3048CS

16-Pin SOIC NB (S)

PRELIMINARY DATA SHEET

Data Sheet No.PD94253

Figure 1 - Typical application of IRU3048 configured as 2-independent converter.

DDR Memory Source Sink Vtt Application

Graphic Card

Hard Disk Drive

Power supplies requiring multiple outputs

12V

5V

C1

R2

Q5

L2

Q4

Q1

C2

3.3V

U1

R6

L1

R5

C5

R1

R4

C4

R3

C3

PGnd

LDrv1

HDrv1

Fb1

Fb2

LDrv2

HDrv2

VcH1

VcH2

Vcc

Gnd

Comp2

Fb3

Comp1

SS

IRU3048

Q3

Q2

C6

R7

C7

R8