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IRU3072C

Description
20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER
File Size320KB,24 Pages
ManufacturerInternational Rectifier ( Infineon )
Websitehttp://www.irf.com/
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IRU3072C Overview

20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER

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
(°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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Description 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER
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