Linear Technology LTC1706-82 Datasheet

LTC1706-82

Final Electrical Specifications

VID Voltage Programmer

for Intel VRM 9.0

FEATURES

■

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

■

±0.25% Accurate Voltage Divider

■

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

■

Available in MSOP-10 Packaging

U

APPLICATIO S

■

Intel Pentium® III Processor Power Supply

■

Multiprocessor Workstations and Servers

■

Multiphase Processor Power Supply

■

AMD AthlonTM Processor Power Supply

U

January 2000

DESCRIPTIO

The LTC®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 Technol­ogy 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.

TYPICAL APPLICATIO

VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram)

V

CC

VID0

FROM

µP

VID1

VID2

LTC1706-82
VID3

VID4

GND

UP TO SIX LTC1629s CAN BE PARALLELED
TO DELIVER AS MUCH AS 200A

SENSE

U

V

IN

4.5V TO 22V

V

IN

INTV

CC

LTC1629

V

DIFFOUT

SGND

FB

EAIN

LTC1629

SGND

EAIN

TG1

SW1

BG1

PGND

TG2

SW2

BG2

V

TG1

SW1

BG1

PGND

TG2

SW2

BG2

IN

V

IN

4.5V TO 22V

L1 R

SENSE1

V

IN

R

L2

SENSE2

R

L3

SENSE3

V

IN

R

L4

SENSE4

1706-82 TA01

+

V

OUT

1.10V TO 1.85V
UP TO 70A

C

OUT

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 represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

1

LTC1706-82

WW

W

ABSOLUTE AXI U RATI GS

U

UUW

PACKAGE/ORDER I FOR ATIO

(Note 1)

(Voltages Referred to GND Pin)

Input Supply Voltage (VCC) ..........................–0.3V to 7V

VID Input Pins .............................................– 0.3V to 7V

SENSE Pin ...................................................–0.3V to 7V

FB Pin ..........................................................–0.3V to 7V

Operating Temperature Range (Note 2) .. – 40°C to 85°C

TOP VIEW

1

VID0

2

VID1

3

VID2

4

VID3

5

V

CC

MS10 PACKAGE

10-LEAD PLASTIC MSOP

10

FB

9

GND

8

NC

7

VID4

6

SENSE

ORDER PART

NUMBER

LTC1706EMS-82

MS10

PART MARKING

Junction Temperature........................................... 110°C

Storage Temperature Range ................. –65°C to 150°C

T

= 110°C, θJA = 120°C/W

JMAX

LTMJ

Lead Temperature (Soldering, 10 sec).................. 300°C

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

2.7V ≤ VCC ≤ 5.5V, VIDO = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

I

VCC

R

FB-SENSE

V

Error % Output Voltage Accuracy Programmed From 1.10V to 1.85V ● –0.25 0.25 %

OUT

R

PULLUP

VID

T

I

VID-LEAK

V

PULLUP

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: The LTC1706-82 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.

Operating Supply Voltage Range 2.7 5.5 V
Supply Current (Note 3) 0.1 5.0 µA
Resistance Between SENSE and FB ● 61014 kΩ

VID Input Pull-Up Resistance V
VID Input Voltage Threshold V

VID Input Leakage Current VCC < VID < 7V, (Note 4) 0.01 ±1.00 µA
VID Pull-Up Voltage VCC = 3.3V 2.8 V

= 0.6V, (Note 4) 40 kΩ

DIODE

(2.7V < VCC < 5.5V) 0.4 V

IL

V

(2.7V < VCC < 5.5V) 1.6 V

IH

V

= 5V 4.5 V

CC

Note 3: With all five VID inputs floating, the VCC supply current is simply
the device leakage current. However, the V
be approximately equal to the number of grounded VID input pins times
(VCC – 0.6V)/40k. (See the Applications Information section for more
detail.)

Note 4: Each built-in pull-up resistor attached to the VID inputs also has a
series diode connected to V
supply without damage or clamping. (See Operation section for further
details.)

to allow input voltages higher than the V

CC

supply current will rise and

CC

CC

2

UW

TEMPERATURE (°C)

–50 0 50 100

ERROR (%)

1706-82 G02

0.25

0

–0.25

V

OUT

= 1.85V

V

OUT

= 1.5V

V

OUT

= 1.1V

TEMPERATURE (°C)

–50 0 50 100

VID PULL-UP CURRENT (µA)

1706-82 G04

120

100

80

60

40

20

0

VCC = 5V
VID4 = 0V
VID0 = VID1 = VID2 = VID3 = OPEN

SUPPLY VOLTAGE (V)

02468

SUPPLY CURRENT (µA)

1706-82 G06

5

4

3

2

1

0

ALL VID INPUTS OPEN

T

A

= 25°C

TYPICAL PERFOR A CE CHARACTERISTICS

Typical Error % vs Output Voltage Typical Error % vs Temperature

0.25

TA = 25°C

0

ERROR (%)

LTC1706-82

(kΩ)
R

FB1

–0.25

1.2 1.3 1.4 1.5 1.6 1.7 1.8

1.1

R

FB1

30

20

10

0

–50 0 50 100

OUTPUT VOLTAGE (V)

1706-82 G01

vs Temperature I

TEMPERATURE (°C)

1706-82 G03

VID-PULLUP

vs Temperature

Supply Current vs Temperature Supply Current vs Supply Voltage

2.0
ALL VID INPUTS OPEN

1.5

1.0

SUPPLY CURRENT (µA)

VCC = 5V

0.5

0

–50 0 50 100

VCC = 3.3V

TEMPERATURE (°C)

VCC = 2.7V

1706-82 G05

3