lx1670 Microsemi Corporation, lx1670 Datasheet

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lx1670

Manufacturer Part Number
lx1670
Description
5 - Bit Programmable Votage Reference
Manufacturer
Microsemi Corporation
Datasheet
T
Copyright © 1997
Rev. 1.0
H E
Digital
The LX1670 is a complete precision
reference and voltage monitor circuit
for the Intel Pentium
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
Word
Input
5-Bit
7/97
I
N F I N I T E
Enable
Blank Enable
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
T
P
Y P I C A L
®
O W E R
Pro Processor
P R O D U C T H I G H L I G H T
D0
D1
D2
D3
D4
ENABLE
BLKEN
GND
A
F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
D E S C R I P T I O N
P P L I C AT I O N O F T H E
O F
System Output
11861 W
Note: All surface-mount packages are available in Tape & Reel.
LX1670
Voltage
I
V
Append the letter "T" to part number. (i.e. LX1670CDT)
N N O V A T I O N
V
V
SENSE
CC
CC
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 A C K A G E O R D E R I N F O
ESTERN
0 to 70
T
A
(°C)
OV
A
L X 1 6 7 0
VIDO
P
GOOD
VENUE
OUT
D
, G
ARDEN
Plastic SOIC
14-pin
LX1670CD
5 - B
To PWM
Error Amplifier
SCR Drive
Power Good
G
I T
ROVE
P
R O D U C T I O N
P
, CA. 92841
R O G R A M M A B L E
F 1% TOTAL OUTPUT ERROR
F POWER GOOD, UV, 0V COMPARATORS
F 0V COMPARATOR HAS SCR DRIVE
F UNDER-VOLTAGE LOCKOUT CAPABILITY
F 5-BIT INPUT FOR ADVANCED PENTIUM PRO
F IMPLEMENTS 1% DC ACCURATE CONTROL
F 14-PIN NARROW BODY SOIC PACKAGE
PROCESSOR APPLICATIONS (5
AUTOMATIC GAIN AND OFFSET SCALING)
SYSTEM
PENTIUM II & PENTIUM PRO VOLTAGE
REGULATOR MODULES
PROGRAMMABLE POWER SUPPLIES
VOLTAGE REFERENCE
ADVANCED MICROPROCESSOR SUPPLIES
K E Y F E A T U R E S
A P P L I C A T I O N S
D
V
A T A
O L T A G E
LIN D
S
LX1670
R
H E E T
E F E R E N C E
O C
TH
#: 1670
BIT IS FOR
1

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lx1670 Summary of contents

Page 1

... Power Good GOOD V SENSE Voltage Plastic SOIC T (° 14-pin LX1670CD Append the letter "T" to part number. (i.e. LX1670CDT ESTERN VENUE ARDEN ROVE LIN LX1670 ...

Page 2

... LX1670 Supply Voltage (V ) .................................................................................... -0.3V to +15V D0-D3, D4, ENABLE, BLKEN ....................................................... -0. GOOD VIDO ....................................................................................... -0.3V to +5V OUT SENSE OV ........................................................................................................................ -35mA OUT VIDO ........................................................................................................................... -5mA Operating Junction Temperature Plastic (D Package) ............................................................................................... 150° ...

Page 3

... (Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX1670C with 0°C 10.8V < V < 13.2V, D0-D3 = Open Open, ENABLE = 1, BLKEN = 1. Nominal conditions positive. Current maximums are currents with the highest possible value.) ...

Page 4

... LX1670 D4- < 1 1.0 < V < UVLOT > UVLOT > UVLOT VIDO Table CC V > UVLOT VIDO Table CC V > UVLOT VIDO Table CC V > UVLOT VIDO Table CC V > UVLOT VIDO Table ...

Page 5

... LX1670 ...

Page 6

... LX1670 UNDER-VOLTAGE LOCKOUT This function keeps order to the IC until the power supply voltage reaches 85% of its nominal value. The output voltage is pulled low and P and OV are pulled low. Once the power supply ...

Page 7

... VID0 Note 1. Setup shown is for 5V application. For 12V input change the following: - Close JP1 and JP4 FIGURE 1 — LX1660/61 CONTROLLER USED WITH THE LX1670 PROGRAMMABLE REFERENCE/DAC CHIP FOR PENTIUM PRO PROCESSOR OR PENTIUM II PROCESSOR APPLICATIONS. GUARANTEED TO MEET INTEL SPECIFICATIONS. PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document may not be modified in any way without the express written consent of Linfinity ...

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