SC1153

PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS PRELIMINARY - October 3, 2000 SC1153 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1153 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 SC1153 is ideal for implementing DC/DC converters needed to power advanced microprocessors, such as Pentium® lll, 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. SC1153 features include an integrated 5-bit VID DAC, temperature compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, and an accessible, internally compensated error amplifier. Power good signaling, logic compatible shutdown, and over voltage protection are also provided. The SC1153 operates at a fixed 200KHz, providing an optimum compromise between efficiency, external component size, and cost. FEATURES = Low cost / full featured = Synchronous operation = 5 Bit VID programmable output = On-chip power good and OVP functions = Designed to meet Intel VRM 8.4 (Pentium® IlI) = 1.3V to 3.5V Range, 1% tolerance APPLICATIONS = Pentium® IlI Core Supply = Multiple Micropro...