IR3638SPBF Datasheet, PDF (1/15 Pages) International Rectifier – HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS

Data Sheet No.PD94724
IR3638SPbF
HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
FOR TRACKING APPLIACTIONS
Features
• Power up Sequencing / Tracking
• Enable Input
• Internal 400kHz Oscillator
• Programmable Soft-Start
• Fixed Frequency Voltage Mode
• Output Voltage as low as 0.6V
Applications
• Tracking Applications
• Game Consoles
• Computing Peripheral Voltage Regulators
• Graphics Cards
• General DC/DC Converters
Description
The IR3638 controller IC is designed to provide a
simple synchronous Buck regulator for on-board
DC to DC applications in a 14-pin SOIC. The
IR3638 is designed specifically for tracking
applications by providing the track input.
The IR3638 operates at a fixed internal 400kHz
switching frequency allowing the use of small
external components.
The device features a programmable soft start set
by an external capacitor, under-voltage lockout
and output under-voltage detection that latches
off the device when an output short is detected.
12V
5V
C1
C2
C3
Vcc
Vc
HDrv
V_CPUCore
C6
D1
Vp / Enable
LDrv
SS
PGnd
Fb
Comp
C4
Gnd
C5
R3
Q1
L1
Q2
R1
R2
Vout
C7
3/19/07
Fig. 1: Typical Application Circuit
ORDERING INFORMATION
PKG PACKAGE
DESIG DESCRIPTION
S
IR3638STRPbF
PIN
PARTS
COUNT PER TUBE
14
----
PARTS
PER REEL
2500
T&R
ORIANTAION
Figure A