SC1152 Datasheet | SEMTECH

DESCRIPTION The SC1152 is a low-cost, full featured, synchronous voltage-mode controller designed for use in single ended power supply applications where efficiency is of primary concern. Synchronous operation allows for the elimination of heat sinks in many applications. The SC1152 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as ® Pentium ll (Klamath), in both single and multiple processor configurations. Internal level-shift, high-side drive circuitry, and preset shoot-thru control, allows for use of inexpensive n-channel power switches. SC1152 Features include an integrated 5-bit VID DAC, temperature pensated voltage reference, triangle wave oscillator, current limit parator, frequency shift over-current protection, and an accessible, internally pensated error amplifier. Power good signaling, logic patible shutdown, and over voltage protection are also provided. The SC1152 operates at a fixed 200KHz, providing an optimum promise between efficiency, external ponent size, and cost. Features - - - - - - - - - - Low cost / full featured Synchronous operation 5 Bit VID DAC programmable output On-chip power good and OVP functions ® Designed to meet Intel VRM8.1 (Pentium II) APPLICATIONS Pentium® II (Klamath) Core Supply Multiple Microprocessor Supplies Voltage Regulator Modules (VRM) Programmable Power Supplies High Efficiency DC/DC Conversion ORDERING INFORMATION DEVICE (1) PACKAGE SO-20 TEMP. RANGE (TJ) 0 - 125°C SC1152CS Note: (1) Add suffix ‘TR’ for tape and reel. PIN CONFIGURATION BLOCK DIAGRAM Top View VCC CS(-) CS(+) CURRENT LIMIT VCC VID4 VID3 VID2 VID1 VID0 200 k Hz 70m V + UPPER FET LEVEL SHIFT AND DRIVE BSTH SHUTDOWN 1.25V REF D/A AND SHUTDOWN LOGIC DECODED SHUTDOWN SIGNAL R OSCILLATOR S Q PGNDH VOSENSE OPEN COLLECTORS + PWRGOOD + SYNCHRONOUS + ERROR...