LX1670

LIN D O C #: 1670 LX1670 5 - B I T P R O G R A M M A B L E V O L TA G E R E F E R E N C E T H E I N F I N I T E P O W E R O F I N N O VA T I O N P R O D U C T I O N D A T A S H E E T 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. p p p p p K E Y F E AT U R E S 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 PROCESSOR APPLICATIONS (5 TH BIT IS FOR AUTOMATIC GAIN AND OFFSET SCALING) p IMPLEMENTS 1% DC ACCURATE CONTROL SYSTEM p 14-PIN NARROW BODY SOIC PACKAGE PRODUCT HIGHLIGHT A P P L I C AT I O N S s PENTIUM II & PENTIUM PRO VOLTAGE REGULATOR MODULES s PROGRAMMABLE POWER SUPPLIES s VOLTAGE REFERENCE s ADVANCED MICROPROCESSOR SUPPLIES T Y P I C A L A P P L I C AT I O N VCC OF THE LX1670 5-Bit Digital Input Word BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 Enable Blank Enable D0 D1 D2 D3 D4 ENABLE BLKEN GND VCC VIDO To PWM Error Amplifier SCR Drive LX1670 ...