SC1154 Datasheet | SEMTECH

DESCRIPTION The SC1154 is a synchronous-buck switch-mode controller designed for use in single ended power supply applications where efficiency is the primary concern. The controller is a hysteretic type, with a user selectable hysteresis. The SC1154 is ideal for implementing DC/DC converters needed to power advanced ® microprocessors such as Pentium ll, in both single and multiple processor configurations. Inhibit, undervoltage lockout and soft-start functions are included for controlled power-up. SC1154 Features include an integrated 5 bit D/A converter, temperature pensated voltage reference, current limit parator, over-current protection, and an adaptive deadtime circuit to prevent shoot-through of the power MOSFET during switching transitions. Power good signaling, logic patible shutdown, and over-voltage protection are also provided. The integrated D/A converter provides programmability of output voltage from 2.0V to 3.5V in 100m V increments and 1.3V to 2.05V in 50m V increments with no external ponents. The SC1154 high side driver can be configured as either a grounded reference or as a floating bootstrap driver. High and low side drivers have a peak current rating of 2 amps. Features - Programmable hysteresis - 5 bit DAC programmable output (1.3V-3.5V) - On-chip power good and OVP functions - Designed to meet latest Intel specifications - Up to 95% efficiency - +1% tolerance over temperature APPLICATIONS - Server Systems and Workstations - Pentium® II Core Supply - Multiple Microprocessor Supplies - Voltage Regulator Modules ORDERING INFORMATION DEVICE (1) PACKAGE SO-28 TEMP. RANGE (TJ) 0 - 125°C SC1154CSW Note: (1) Add suffix ‘TR’ for tape and reel. PIN CONFIGURATION Top View SIMPLIFIED BLOCK DIAGRAM (28-Pin SOIC) Pentium is a registered trademark of Intel Corporation © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS PRELIMINARY...