IRU3137 Datasheet, PDF (1/19 Pages) International Rectifier – 8-PIN SYNCHRONOUS PWM CONTROLLER

Data Sheet No. PD94700
IRU3137
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
1A Peak Output Drive Capability
0.8V Reference Voltage
Shuts off both drivers at shorted output
and shutdown
Operating with single 5V or 12V supply voltage
Stable with ceramic capacitors
Internal 200KHz Oscillator
Soft-Start Function
Protects the output when control FET is shorted
Synchronous Controller in 8-Pin Package
APPLICATIONS
DDR Memory Application
Low voltage distributed DC-DC
Graphic Cards
Low cost on-board DC to DC such as 5V to 2.5V,
1.8V or 0.8V
DESCRIPTION
The IRU3137 controller IC is designed to provide a low
cost and high performance synchronous Buck regulator
for on-board DC to DC converter applications. The out-
put voltage can be set as low as 0.8V and higher voltage
can be obtained with an external voltage divider. High
peak current gate drivers provide fast switching transi-
tion for applications requiring high output current in the
range of 15A to 20A.
This device features an internal 200KHz oscillator, un-
der-voltage lockout for both Vcc and Vc supplies, an
external programmable soft-start function as well as
output under-voltage detection that latches off the de-
vice when an output short is detected.
TYPICAL APPLICATION
12V
C3
C4
1uF
1uF
Optional
L1
C2
4x 150uF
1uH
5V
C1
47uF
Vcc Vc
HDrv
C8
0.1uF
C9
3300pF
Optional
R4
30K
SS/SD
U1 ^LDrv
IRU3137
Comp
Fb
Gnd
Q1
IRF7832
D1
Q2
IRF7832
L2
2.2uH
R5
1K, 1%
R3
2.15K
2.5V
@ 15A
C7
3x 330uF
40mΩ, Poscap
Figure 1 - Typical application of IRU3137.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
DEVICE
IRU3137CS
PACKAGE
8-Pin Plastic SOIC NB (S)
FREQUENCY
200KHz
Rev. 1.0
06/22/04
www.irf.com
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