SC1182 Datasheet | SEMTECH

DESCRIPTION The SC1182/3 bines a synchronous voltage mode controller with two low-dropout linear regulators providing most of the circuitry necessary to implement three DC/DC converters for powering advanced ® microprocessors such as Pentium II (Klamath) or Deschutes. The SC1182/3 switching section Features an integrated 5 bit D/A converter, pulse by pulse current limiting, integrated power good signaling, and logic patible shutdown. The SC1182/3 switching section operates at a fixed frequency of 200k Hz, providing an optimum promise 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 100m V increments and 1.30V to 2.05V in 50m V increments with no external ponents. The SC1182/3 linear sections are low dropout regulators. The SC1182 supplies 1.5V for GTL bus and 2.5V for non-GTL I/O. For the SC1183 both LDO’s are adjustable. Features - - - - - - - - - - Synchronous design, enables no heatsink solution 95% efficiency (switching section) 5 bit DAC for output programmability On chip power good function ® Designed for Intel Pentium ll VRM8.1 requirements 1.5V, 2.5V or Adj. @ 1% for linear section APPLICATIONS Pentium ll or Deschutes microprocessor supplies Flexible motherboards 1.3V to 3.5V microprocessor supplies Programmable triple power supplies ® ORDERING INFORMATION Part Number (1) Package Linear Voltage Temp. Range (T J) SC1182CSW SC1183CSW SO-24 SO-24 1.5V/2.5V 0° to 125°C Adj. 0° to 125°C Note: (1) Add suffix ‘TR’ for tape and reel. PIN CONFIGURATION BLOCK DIAGRAM REF. Top View AGND GATE1 LDOS1 LDOS2 VCC OVP PWRGOOD CSCS+ PGNDH DH PGNDL 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 GATE2 LDOV VID0 VID1 VID2 VID3 VID4 VOSENSE EN BSTH BSTL...