IRU3047 Datasheet, PDF (1/19 Pages) International Rectifier – DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER

Data Sheet No. PD94252
IRU3047
DUAL SYNCHRONOUS PWM CONTROLLER WITH
CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
PRELIMINARY DATA SHEET
FEATURES
DESCRIPTION
Dual Synchronous Controller in 20-Pin Package
with 1808 out-of-phase operation
LDO Controller with 40mA drive
Can be configured as 2-Independent or 2-Phase
PWM Controller
Programmable Current Sharing in 2-Phase Configu-
ration
Flexible, Same or Separate Supply Operation
Operation from 4V to 25V Input
Internal 200KHz Oscillator per phase
Soft-Start controls all outputs
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Short Circuit Protection for All Outputs
Power Good Output
The IRU3047 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 can be configured as 2-independent or 2-phase
controller. In 2-phase configuration, the IRU3047 provides
a programmable current sharing which is ideal when the
output power exceeds any single input power budget.
IRU3047 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.
APPLICATIONS
Dual-Phase Power Supply
DDR Memory Source Sink Vtt Application
Graphic Card
Hard Disk Drive
Power supplies requiring multiple outputs
TYPICAL APPLICATION
12V
5V
C1
L1
C2
C3
C4
C13
VCL VcH1 VcH2
Vcc
C5
HDrv1
3.3V
C6
Q1
VOUT2
R1
C7
R2
C8 ^R3
LDrv1
V OUT3
Fb3
U1
PGnd
V REF
IRU3047 Vp2
Fb1
Comp1
Fb2
C9 ^R4
Comp2
HDrv2
PGood
PGood
SS
C10
LDrv2
Gnd
D1
D2
C12
L2
C11
C14
Q2
L3
R5
Q3
C17
Q4
L4
R9
Q5
VOUT1
C16
R7
R8
Figure 1 - Typical application of IRU3047 configured as 2-phase converter.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
DEVICE
IRU3047CW
PACKAGE
20-Pin Plastic SOIC (W)
Rev. 1.0
09/09/02
www.irf.com
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