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SC1157CS Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1157CS Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 5 page SC1157 PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 Preliminary - August 7, 2000 1 Pentium is a registered trademark of Intel Corporation BLOCK DIAGRAM PIN CONFIGURATION Top View (16-Pin SOIC) DESCRIPTION The SC1157 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 SC1157 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium ® ll (Klamath), in both single and multiple pro- cessor configurations. Internal level-shift, high-side drive circuitry, and preset shoot-thru control, allows for use of inexpensive n-channel power switches. SC1157 features include an integrated 4-bit V ID DAC, temperature compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, and an internally compen- sated error amplifier. The SC1157 operates at a fixed 140KHz, providing an optimum compromise between efficiency, external component size, and cost. FEATURES •= Low cost / full featured •= Synchronous operation •= 4 Bit V ID DAC programmable output (1% tolerance) •= Designed to meet Intel VRM8.2 (Pentium® II) •= 1.5% Reference APPLICATIONS •= Pentium® II Core Supply •= Multiple Microprocessor Supplies •= Voltage Regulator Modules (VRM) •= Programmable Power Supplies •= High Efficiency DC/DC Conversion TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DEVICE (1) PACKAGE (2) TEMP. RANGE (T J) SC1157CS.TR SO-16NB 0 - 125°C ORDERING INFORMATION Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) “NB” indicates 150 MIL body. R S Q + - 70mV + - + - ERROR AMP D/A SHOOT-THRU CONTROL VCC CS- BSTH DH SHUTDOWN CS+ BSTL DL PGND VOSENSE REF VID2 VID1 VID0 GND REF CURRENT LIMIT LEVEL SHIFT AND HIGH SIDE DRIVE SYNCHRONOUS MOSFET DRIVE OSCILLATOR VID3 |
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