DESCRIPTION

The LX1670 is a complete precision reference and voltage monitor circuit for the Intel Pentium® Pro Processor and other high-end microprocessor supplies. It is designed for use in conjunction with the LX1660/1661 PWM controller. The LX1670 reads a 5-bit voltage identification (VID) code from the microprocessor and sets the output voltage reference to be used by the LX1660/61 controller. Together, they convert +5 or 12V input power to an adjustable output ranging from 1.8VDC to 3.5VDC in 100mV steps (50mV steps below 2.1V) with 1 DC system accuracy.

KEY FEATURES

□ 1 TOTAL OUTPUT ERROR

□ POWER GOOD, UV, 0V COMPARATORS

□ 0V COMPARATOR HAS SCR DRIVE

□ UNDER-VOLTAGE LOCKOUT CAPABILITY

□ 5-BIT INPUT FOR ADVANCED PENTIUM PRO ROCESSOR APPLICATIONS (5TH BIT IS FOR AUTOMATIC GAIN AND OFFSET SCALING)

□ IMPLEMENTS 1 DC ACCURATE CONTROL SYSTEM

□ 14-PIN NARROW BODY SOIC PACKAGE

APPLICATIONS

■ PENTIUM II & PENTIUM PRO VOLTAGE REGULATOR MODULES

■ PROGRAMMABLE POWER SUPPLIES

■ VOLTAGE REFERENCE

■ ADVANCED MICROPROCESSOR SUPPLIES