IR3638 Datasheet, PDF (1/13 Pages) ON Semiconductor – High Frequency Synchronous

IR3638
High Frequency Synchronous
Step Down PWM Controller
for Tracking Applications
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 400 kHz 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.
Features
• Power up Sequencing / Tracking
• Enable Input
• Internal 400 kHz Oscillator
• Programmable Soft−Start
• Fixed Frequency Voltage Mode
Applications
• Tracking Applications
• Game Consoles
• Computing Peripheral Voltage Regulators
• Graphics Cards
• General DC to DC Converters
http://onsemi.com
MARKING
SOIC−14
DIAGRAM
14
D SUFFIX
1
CASE 751A
IR3638G
A
= Assembly Location
AWLYWW
WL = Wafer Lot
Y
= Year
1
WW = Work Week
G
= Pb−Free Package
PIN CONNECTIONS
FB
NC
1
VP
SS
NC
COMP
VCC
NC
NC
VC
LDRV
HDRV
GND
PGND
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2009
1
June, 2009 − Rev. 0
Publication Order Number:
IR3638/D