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Data Sheet No. 94715
IR3637ASPbF
1% ACCURATE SYNCHRONOUS PWM CONTROLLER FEATURES
0.8V Reference Vo...
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Data Sheet No. 94715
IR3637ASPbF
1% ACCURATE SYNCHRONOUS PWM CONTROLLER FEATURES
0.8V Reference Voltage Operates with a single 5V Supply Internal 600KHz Oscillator Soft-Start Function Fixed Frequency Voltage Mode Short Circuit Protection
DESCRIPTION
The IR3637A 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 IR3637A operates at a fixed internal 600KHz 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
C4
SS/SD LDrv
L1 Q2 C6
Vout
IR3637A
C5 Comp Gnd Fb R2 R3
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R1
Figure 1 - Typical application of IR3637A.
ORDERING INFORMATION
PACKAGE PIN PARTS PARTS T&R DESCRIPTION COUNT PER TUBE PER REEL Oriantation IR3637ASPbF 8 95 -----Fig A IR3637ASTRPbF 8 ------2500
PKG DESIG S S
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IR3637ASPbF
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ................................................ Vc Supply Voltage .................