IRU3048 Datasheet, PDF (1/18 Pages) International Rectifier – DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER

Data Sheet No.PD94253
IRU3048
DUAL SYNCHRONOUS PWM CONTROLLER
CIRCUITRY AND LDO CONTROLLER
PRELIMINARY DATA SHEET
FEATURES
DESCRIPTION
Dual Synchronous Controller in 16-Pin Package
with 1808 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
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.
APPLICATIONS
DDR Memory Source Sink Vtt Application
Graphic Card
Hard Disk Drive
Power supplies requiring multiple outputs
TYPICAL APPLICATION
12V
5V
3.3V
C1
V OUT3
Q1
R1
C2
R2
C3 ^R3
C4 ^R4
C5
VcH1 VcH2
HDrv1
Vcc
LDrv1
VOUT3
U1
PGnd
Fb3
IRU3048
Fb1
Comp1
Fb2
Comp2
HDrv2
LDrv2
SS
Gnd
Q2
L1
Q3
VOUT1
C6
R5
R6
Q4
L2
VOUT2
Q5
R7
C7
R8
Figure 1 - Typical application of IRU3048 configured as 2-independent converter.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
0 To 70
DEVICE
IRU3048CF
IRU3048CS
PACKAGE
16-Pin TSSOP (F)
16-Pin SOIC NB (S)
Rev. 1.7
09/12/02
www.irf.com
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