IR3637SPBF Datasheet, PDF (1/21 Pages) International Rectifier – 1% ACCURATE SYNCHRONOUS PWM CONTROLLER

Data Sheet No. PD94713
IR3637SPBF
1% ACCURATE SYNCHRONOUS PWM CONTROLLER
FEATURES
0.8V Reference Voltage
Operates with a single 5V Supply Voltage
Internal 400kHz Oscillator
Soft-Start Function
Fixed Frequency Voltage Mode
Short Circuit Protection
APPLICATIONS
Computer Peripheral Voltage Regulator
Memory Power supplies
Graphics Card
Low cost on-board DC to DC
DESCRIPTION
The IR3637 controller IC is designed to provide a simple
synchronous Buck regulator for on-board DC to DC ap-
plications in a small 8-pin SOIC. The output voltage can
be precisely regulated using the internal 0.8V reference
voltage for low voltage applications.
The IR3637 operates at a fixed internal 400kHz switch-
ing frequency to reduce the component size.
The device features under-voltage lockout for both input
supplies, an external programmable soft-start function
as well as output under-voltage detection that latches
off the device when an output short is detected.
TYPICAL APPLICATION
12V
5V
C3
C2
C1
Vc
Vcc
HDrv
Q1
L1
SS/SD
D1
C4
IR3637 LDrv
Q2
Comp
C5
Fb
Gnd
R1
R3
R2
Vout
C6
Figure 1 - Typical application of IR3637.
ORDERING INFORMATION
PKG
DESIG
S
S
PACKAGE
PIN
PARTS PARTS T & R
DESCRIPTION COUNT PER TUBE PER REEL Oriantation
IR3637SPBF
8
IR3637STRPBF 8
95
-------
------
2500
Fig A
Rev. 1.1
06/16/05
www.irf.com
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