LTC1706-81_15 Datasheet, PDF (1/8 Pages) Linear Technology – 5-Bit Desktop VID Voltage Programmer

LTC1706-81
5-Bit Desktop VID
Voltage Programmer
FEATURES
s _{Programs Regulator Output Voltage Range from}
1.3V to 2.05V in 50mV Steps and from 2.1V to 3.5V
in 100mV Steps (VRM 8.4)
s _{Programs a Wide Range of Linear Technology}
DC/DC Converters with a 0.8V Reference
s _{Fully Compliant with the Intel Pentium}^® _Processor
Desktop VID Specification
s _{±0.25% Accurate Output Voltage}
s _{Built-In 40k Pull-Up Resistors on VID Inputs}
s _{Available in MSOP-10 Package}
U
APPLICATIO S
s _{Intel Pentium II and III Processor Power Supply}
s _{AMD Athlon}^TM _{Processor Power Supply}
s _{Workstations and Servers}
s _{Large Memory Array Supply}
DESCRIPTIO
The LTC^®1706-81 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 1.3V and 3.5V is
programmed in 50mV and 100mV increments.
The LTC1706-81 is designed specifically to program
an entire family of Linear Technology DC/DC converters in
full compliance with the Intel Desktop (VRM 8.4) VID
specification.
The LTC1706-81 programs the following Linear
Technology DC/DC converter products: LTC1622,
LTC1628, LTC1629, LTC1702, LTC1735, LTC1735-1,
LTC1772 and LTC1929. (Consult factory for future com-
patible 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.
TYPICAL APPLICATION
5-Bit VID-Controlled High Current 4-Phase Application (Simplified Block Diagram)
V_IN
4.5V TO 22V
FROM
µP
VID0 ^VCC
VID1
SENSE
VID2 LTC1706-81
VID3
FB
VID4 GND
V_IN
LTC1629 TG1
INTV_CC
V_DIFFOUT
SGND
EAIN
SW1
BG1
PGND
TG2
SW2
L1 R_SENSE1
V_IN
L2 R_SENSE2
BG2
V_IN
4.5V TO 22V
V_OUT
1.3V TO 3.5V
+
UP TO 70A
C_OUT
V_IN
LTC1629 TG1
SW1
BG1
SGND
EAIN
PGND
TG2
SW2
BG2
L3 RSENSE3
V_IN
L4 R_SENSE4
1706-81 TA01
1