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LTC1706-81

5-Bit Desktop VID

Voltage Programmer

FEATURES

s

DESCRIPTIO

s

s

s

s

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)

Programs a Wide Range of Linear Technology

DC/DC Converters with a 0.8V Reference

Fully Compliant with the Intel Pentium

廬

Processor

Desktop VID Specification

鹵0.25%

Accurate Output Voltage

Built-In 40k Pull-Up Resistors on VID Inputs

Available in MSOP-10 Package

The LTC

廬

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.

APPLICATIO S

s

s

s

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Intel Pentium II and III Processor Power Supply

AMD Athlon

TM

Processor Power Supply

Workstations and Servers

Large Memory Array Supply

TYPICAL APPLICATION

5-Bit VID-Controlled High Current 4-Phase Application (Simplified Block Diagram)

V

IN

4.5V TO 22V

V

IN

LTC1629

VID0

VID1

FROM

碌P

V

CC

SENSE

TG1

SW1

INTV

CC

V

DIFFOUT

SGND

FB

GND

EAIN

TG2

SW2

BG2

V

IN

4.5V TO 22V

V

IN

LTC1629

TG1

SW1

BG1

PGND

SGND

EAIN

TG2

SW2

BG2

1706-81 TA01

L1

R

SENSE1

BG1

PGND

V

IN

VID2 LTC1706-81

VID3

VID4

L2

R

SENSE2

L3

R

SENSE3

V

IN

L4

R

SENSE4

U

+

V

OUT

1.3V TO 3.5V

UP TO 70A

C

OUT

U

U

1

next

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