Final Electrical Specifications
LTC1706-82
VID Voltage Programmer
for Intel VRM 9.0
January 2000
FEATURES
s
s
DESCRIPTIO
s
s
s
s
Fully Compliant with the Intel VRM 9.0 VID
Specification
Programs Regulator Output Voltage from 1.10V to
1.85V in 25mV Steps
Programs an Entire Family of Linear Technology
DC/DC Converters
鹵0.25%
Accurate Voltage Divider
Built-In 40k Pull-Up Resistors on Program Inputs
Available in MSOP-10 Packaging
The LTC
廬
1706-82 is a precision, digitally programmed,
resistive ladder which adjusts the output of any 0.8V
referenced regulator. Depending on the state of the five
VID inputs, an output voltage between 1.10V and 1.85V is
programmed in 25mV increments.
The LTC1706-82 is designed specifically to program an
entire family of Linear Technology DC/DC converters in full
compliance with the Intel Desktop VID specification.
The LTC1706-82 programs the following Linear Technol-
ogy DC/DC converter products: LTC1622, LTC1628,
LTC1629, LTC1702, LTC1735, LTC1735-1, LTC1772 and
LTC1929.
Consult factory for future compatible DC/DC converter
products.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
AMD Athlon is a trademark of Advanced Micro Devices, Inc.
APPLICATIO S
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Intel Pentium
廬
III Processor Power Supply
Multiprocessor Workstations and Servers
Multiphase Processor Power Supply
AMD Athlon
TM
Processor Power Supply
TYPICAL APPLICATIO
VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram)
V
IN
4.5V TO 22V
V
IN
INTV
CC
VID0
VID1
FROM
碌P
V
CC
SENSE
LTC1629
V
DIFFOUT
SGND
FB
GND
EAIN
TG2
SW2
BG2
V
IN
4.5V TO 22V
V
IN
LTC1629
TG1
SW1
BG1
PGND
SGND
EAIN
UP TO SIX LTC1629s CAN BE PARALLELED
TO DELIVER AS MUCH AS 200A
TG2
SW2
BG2
1706-82 TA01
TG1
SW1
BG1
PGND
V
IN
L1
R
SENSE1
VID2 LTC1706-82
VID3
VID4
L2
R
SENSE2
L3
R
SENSE3
V
IN
L4
R
SENSE4
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
+
V
OUT
1.10V TO 1.85V
UP TO 70A
C
OUT
U
U
1