SC1150

PROGRAMMABLE DC/DC CONTROLLER March 11, 1998 SC1150 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1150 voltage mode controller contains most of the circuitry necessary to implement a DC/DC converter ® for powering the Intel Pentium Pro microprocessor, both in single and multiple processor configurations. The SC1150 features an integrated D/A converter, pulse by pulse current limiting, integrated power good signaling, logic compatible shutdown and on-board over voltage protection (OVP). The SC1150 operates at a fixed frequency of 200kHz, providing an optimum compromise between size, efficiency and cost in the intended application areas. The integrated D/A converter provides programmability of output voltage from 2.0V to 3.5V in 100mV increments with no external components. Both the range and the increment value may be changed by adding external components. The SC1150 provides an OVP output which can be used to trigger a crowbar circuit for true over voltage protection. FEATURES 85% efficiency 4 bit DAC for output programmability On chip power good and OVP functions ® Meets Intel Pentium Pro VRM8.0 specifications APPLICATIONS Pentium Pro Processor supplies ® Pentium Pro Processor VRM modules 2.0V to 3.5V microprocessor supplies Programmable power supplies ® ORDERING INFORMATION DEVICE (1) PACKAGE SO-16 TEMP RANGE (TJ) 0 - 125°C SC1150CS Note: (1) Add suffix ‘TR’ for tape and reel. BLOCK DIAGRAM VCC CSm CSp SHUTDOWN 1.2...