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Data Sheet No. PD94713
IR3637SPBF
1% ACCURATE SYNCHRONOUS PWM CONTROLLER FEATURES
0.8V Reference V...
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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
DESCRIPTION
The IR3637 controller IC is designed to provide a simple synchronous Buck
regulator for on-board DC to DC applications 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 switching 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.
APPLICATIONS
Computer Peripheral Voltage
Regulator Memory Power supplies Graphics Card Low cost on-board DC to DC
TYPICAL APPLICATION
12V C3 5V C2 C1
Vc
Vcc HDrv Q1
D1
L1 Vout Q2 C6
SS/SD C4
IR3637 LDrv
C5 R1
m
Comp Fb Gnd R2
R3
4U
.co
eet
Figure 1 - Typical application of IR3637.
Sh
ORDERING INFORMATION
PKG DESIG S S PACKAGE PIN PARTS PARTS T&R DESCRIPTION COUNT PER TUBE PER REEL Oriantation IR3637SPBF 8 95 -----Fig A IR3637STRPBF 8 ------2500
w.D
ata
Rev. 1.1 06/16/05
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IR3637SPBF
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ................................................ Vc Su...