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LTC1706-85_15 Datasheet, PDF (1/8 Pages) Linear Technology – VID Voltage Programmer for Intel VRM 8.5
FEATURES
s Fully Compliant with the Intel VRM 8.5 VID
Specification
s Programs Regulator Output Voltage from 1.05V to
1.825V in 25mV Steps
s Programs an Entire Family of Linear Technology
DC/DC Converters with 0.8V References
s ±0.25% Voltage Programming Accuracy
s Built-In 40k Pull-Up Resistors on Program Inputs
s Available in MSOP-10 Packaging
U
APPLICATIO S
s Server/Desktop Computers
s Multiprocessor Workstations and Servers
s Multiphase Processor Power Supply
LTC1706-85
VID Voltage Programmer
for Intel VRM 8.5
DESCRIPTIO
The LTC®1706-85 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 1.05V and 1.825V
is programmed in 25mV increments.
The LTC1706-85 is designed specifically to program an
entire family of Linear Technology DC/DC converters in full
compliance with the Intel Voltage Regulator Module (VRM)
8.5 specification.
The LTC1706-85 programs the following Linear Technol-
ogy DC/DC converter products: LTC1622, LTC1628,
LTC1629, LTC1702, LTC1735, LTC1735-1, LTC1772,
LTC1773, LTC1778, LTC1929, LTC3728 and LTC3729.
Consult factory for additional DC/DC converter products
compatible with the LTC1706-85.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
TYPICAL APPLICATIO
VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram)
FROM
µP
VID25 VCC
VID0
SENSE
VID1 LTC1706-85
VID2
FB
VID3
GND
VOS+ VOS–
VIN
INTVCC
TG1
SW1
LTC1629
BG1
VDIFFOUT
PGND
SGND
TG2
EAIN
SW2
ITH
CLKOUT BG2
VIN
4.5V TO 22V
VIN
VIN
4.5V TO 22V
PLLIN
VIN
LTC1929 TG1
SW1
BG1
PGND
VIN
SGND
TG2
EAIN
SW2
ITH
NOTE: UP TO SIX LTC1629s/LTC1929s CAN BE PARALLELED
BG2
TO DELIVER AS MUCH AS 200A
RSENSE1
VOUT
1.05V TO 1.825V
+
UP TO 80A
COUT
RSENSE2
RSENSE3
RSENSE4
1706-85 TA01
170685f
1
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