Copyright © 1997

Rev. 1.0

7/97

FOR FUR THER INFORMA TION CALL (714) 898-8121

1

OF

LX1670

DESCRIPTION

KEY FEA TURES

p 1% TOTAL OUTPUT ERROR

p POWER GOOD, UV, 0V COMPARATORS

p 0V COMPARATOR HAS SCR DRIVE

p UNDER-VOLTAGE LOCKOUT CAPABILITY

p 5-BIT INPUT FOR ADVANCED PENTIUM PRO

AUTOMATIC GAIN AND OFFSET SCALING)

p IMPLEMENTS 1% DC ACCURATE CONTROL

SYSTEM

p 14-PIN NARROW BODY SOIC PACKAGE

The LX1670 is a complete precision

reference and voltage monitor circuit

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.

PRODUCT HIGHLIGHT

P ACKAGE ORDER INFO

T

Plastic SOIC

14-pin

0 to 70

LX1670CD

D

APPLICA TIONS

s PENTIUM II & PENTIUM PRO VOLTAGE

REGULATOR MODULES

s PROGRAMMABLE POWER SUPPLIES

s VOLTAGE REFERENCE

s ADVANCED MICROPROCESSOR SUPPLIES

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX1670CDT)

V

CC

D1

D0

D2

D3

D4

ENABLE

BLKEN

GND

V

SENSE

System Output

Voltage

Blank Enable

Enable

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

5-Bit

Digital

Input

Word

V

CC

To PWM

Error Amplifier

SCR Drive

Power Good

VIDO

OV

OUT

P

GOOD

LX1670