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IRU3047CW Datasheet

  • IRU3047CW

  • DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUIT...

  • 19頁

  • IRF

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Data Sheet No. PD94252
IRU3047
DUAL SYNCHRONOUS PWM CONTROLLER WITH
CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
PRELIMINARY DATA SHEET
FEATURES
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
DESCRIPTION
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
L1
5V
C1
C2
C3
C4
V
CL
Vcc
C5
3.3V
C6
V
OUT2
C7
R2
C8
C9
R3
R4
Comp2
HDrv2
Comp1
Q1
R1
Fb3
V
OUT3
LDrv1
Q3
VcH1
VcH2
HDrv1
Q2
C13
C12
L2
D1
D2
C11
C14
L3
R5
V
OUT1
C16
U1
IRU3047
PGnd
V
REF
Vp2
Fb1
Fb2
C17
Q4
L4
R9
R7
R8
PGood
C10
PGood
SS
LDrv2
Gnd
Q5
Figure 1 - Typical application of IRU3047 configured as 2-phase converter.
PACKAGE ORDER INFORMATION
T
A
(擄C)
0 To 70
Rev. 1.0
09/09/02
DEVICE
IRU3047CW
PACKAGE
20-Pin Plastic SOIC (W)
www.irf.com
1

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