IR3637ASTRPBF

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 R1 Comp Gnd Fb R2 R3 Figure 1 - Typical application of IR3637A. ORDERING INFORMATION PKG DESIG S S PACKAGE PIN PARTS PARTS T&R DESCRIPTION COUNT PER TUBE PER REEL Oriantation IR3637ASPbF 8 95 -----Fig A IR3637ASTRPbF 8 ------2500 www.irf.com 1 IR3637ASPbF ABSOLUTE MAXIMUM RATINGS Vcc Supply Voltage ................................................ Vc Supply Voltage .................................................. Storage Temperature Range ..................................... Operating Junction Temperature Range ..................... ESD Classification ................................................. Moisture Sensitivity Level ........................................ 16V 25V -65°C To 150°C 0°C To 125°C HBM Class 2 (2KV) JEDEC Standard JEDEC Level 1 @ 260°C CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. PACKAGE INFORMATION Recommended Operating Conditions Fb 1 Vcc 2 LDrv 3 Gnd 4 8 SS/SD 7 Comp 6 Vc 5 HDrv Parameter Vcc Vc Min 4.5 8 Max 5.5 14 Units V V θJA=154°C/W θJC=41.2°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and 0°C