SC1162 Datasheet | SEMTECH

DESCRIPTION The SC1162/3 bines a synchronous voltage mode controller with a low-dropout linear regulator providing most of the circuitry necessary to implement two DC/ DC converters for powering advanced microprocessors ® such as Pentium II. The SC1162/3 switching section Features an integrated 5 bit D/A converter, pulse by pulse current limiting, integrated power good signaling, and logic patible shutdown. The SC1162/3 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 SC1162/3 linear section is a high performance positive voltage regulator design for either the GTL bus supply at 1.5V (SC1162) or an adjustable output (SC1163). The output of the linear regulator can provide up to 5A or more with the appropriate external MOSFET. 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® II requirements - 1.5V or Adj. @ 1% for linear section - 1.300V-2.05V ±1.5%; 2.100V-3.500V ±2% APPLICATIONS - Pentium® ll or Deschutes microprocessor supplies - Flexible motherboards - 1.3V to 3.5V microprocessor supplies - Programmable dual power supplies ORDERING INFORMATION Part Number (1) Package Linear Voltage Temp. Range (TJ) SC1162CSW SC1163CSW SO-24 SO-24 1.5V Adj. 0° to 125°C 0° to 125°C Note: (1) Add suffix ‘TR’ for tape and reel. PIN CONFIGURATION BLOCK DIAGRAM VCC CS- CS+ EN BSTH 1.25 REF VCC 70m V VID4 VID3 VID2 VID1 VID0 D/A & SHUTDOWN LOGIC CURRENT LIMIT LEVEL SHIFT AND HIGH SIDE MOSFET DRIVE R OSCILLATOR S Q PGNDH Top View VOSENSE OPEN COLLECTORS PWRGOOD VCC ERROR AMP SYNCHRONOUS MOSFET DRIVER BSTL SHOOTTHRU CONTROL (24 Pin...