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PDF LX1670 Data sheet ( Hoja de datos )
| Número de pieza | LX1670 | |
| Descripción | 5 - BIT PROGRAMMABLE VOTAGE REFERENCE | |
| Fabricantes | Microsemi Corporation | |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 1670
LX1670
5-BI T PROGRAMMABLE VOLTAGE REFERENCE
PR O D U C T I O N D ATA 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.
KEY FEATURES
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
PROCESSOR APPLICATIONS (5TH BIT IS FOR
AUTOMATIC GAIN AND OFFSET SCALING)
p IMPLEMENTS 1% DC ACCURATE CONTROL
SYSTEM
p 14-PIN NARROW BODY SOIC PACKAGE
PRODUCT HIGHLIGHT
T Y P I C A L A P P L I C AT I O N O F T H E L X 1 6 7 0
VCC
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
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
LX1670
VSENSE
VIDO
OVOUT
PGOOD
System Output
Voltage
To PWM
Error Amplifier
SCR Drive
Power Good
Copyright © 1997
Rev. 1.0 7/97
PA C K A G E O R D E R I N F O
TA (°C)
D
Plastic SOIC
14-pin
0 to 70
LX1670CD
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX1670CDT)
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
1 page  
PRODUCT DATABOOK 1996/1997
5-BI T PROGRAMMABLE VOLTAGE REFERENCE
PR O D U C T I O N D ATA S H E E T
LX1670
BLKEN 6
D0 8
D1 9
D2 10
D3 11
D4B 13
D4 12
BLOCK
< 1.8V
DAC
BLOCK DIAGRAM
2V REF
10
S 2X1
MUX
OUT
0.87 * VS
0.935 * VS
14 VCC
4.67/4.47V
10.6/10.1V
5 ENABLE
VCC
4 OVOUT
3 PGOOD
GND 7
Pin Name
VIDO
VSENSE
PGOOD
OV OUT
ENABLE
BLKEN
GND
D0
D1
D2
D3
D4
D4B
VCC
0.93 * VE
1
VIDO
VE
VS
2 VSENSE
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FUNCTIONAL PIN DESCRIPTION
Description
Output reference voltage used by PWM controller to set system voltage.
Connected directly to system output voltage.
Open collector output pulls low when the processor's supply is not good.
SCR Driver goes high when processor supply is over voltage.
TTL compatible chip enable. Internally pulled high.
Enables or disables blocking of codes with voltage blow 1.8V for CPU protection. Internally pulled high.
Analog ground return.
LSB DAC logic control. Internally pulled high.
2nd LSB DAC logic control. Internally pulled high.
3rd LSB DAC logic control. Internally pulled high.
MSB DAC logic control. Internally pulled high.
Scales VIDO output when low. Internally pulled high.
Inverting output of D4.
Analog power supply.
Copyright © 1997
Rev. 1.0 7/97
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LX1670.PDF ] | |
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