LTC1706-81 Linear Technology, LTC1706-81 Datasheet

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LTC1706-81

Manufacturer Part Number
LTC1706-81
Description
5-Bit Desktop VID Voltage Programmer
Manufacturer
Linear Technology
Datasheet
FEATURES
APPLICATIO S
TYPICAL
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
Desktop VID Specification
Built-In 40k Pull-Up Resistors on VID Inputs
Available in MSOP-10 Package
Intel Pentium II and III Processor Power Supply
AMD Athlon
Workstations and Servers
Large Memory Array Supply
0.25% Accurate Output Voltage
FROM
APPLICATION
TM
P
Processor Power Supply
U
5-Bit VID-Controlled High Current 4-Phase Application (Simplified Block Diagram)
VID0
VID1
VID2
VID3
VID4
LTC1706-81
GND
V
CC
SENSE
U
FB
®
Processor
INTV
V
SGND
EAIN
SGND
EAIN
DIFFOUT
CC
LTC1629
LTC1629
PGND
PGND
SW1
SW2
SW1
SW2
BG1
BG2
BG1
BG2
TG1
TG2
TG1
TG2
V
V
IN
IN
DESCRIPTIO
The LTC
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.)
Pentium is a registered trademark of Intel Corporation.
AMD Athlon is a trademark of Advanced Micro Devices, Inc.
4.5V TO 22V
, LTC and LT are registered trademarks of Linear Technology Corporation.
4.5V TO 22V
V
IN
V
IN
®
1706-81 is a precision, digitally programmed,
V
V
IN
IN
Voltage Programmer
L2
L3
L4
L1
R
R
R
R
U
5-Bit Desktop VID
SENSE1
SENSE2
SENSE3
SENSE4
1706-81 TA01
+
C
OUT
V
1.3V TO 3.5V
UP TO 70A
LTC1706-81
OUT
1

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LTC1706-81 Summary of contents

Page 1

... 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. ® Processor 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 ...

Page 2

... PULLUP Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1706-81 is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls ...

Page 3

... Supply Current vs Temperature 2.0 ALL VID INPUTS OPEN 1.5 1 3.3V CC 0.5 0 – TEMPERATURE ( C) –0.25 1706-81 G01 100 1706-81 G03 V = 2.7V CC 100 1706-81 G05 LTC1706-81 Typical Error % vs Temperature 0. 1.3V OUT V = 1.7V 0 OUT OUT V = 3.5V OUT – 100 TEMPERATURE ( C) 1706-81 G02 I vs Temperature VID-PULLUP 120 ...

Page 4

... LTC1706- PIN FUNCTIONS VID0 (Pin 1): LSB Programming Input. Low = GND, High = V or Float. Grounding VID0 adds 50mV CC (VID4 = LOW) or 100mV (VID4 = HIGH) to the output sense voltage. VID1 (Pin 2): 3rd MSB Programming Input. Low = GND, High = V or Float. Grounding VID1 adds 100mV ...

Page 5

... VID3 4 U OPERATIO The LTC1706- precision resistive divider designed specifically for use with an entire family of Linear Technology Corporation DC/DC switching regulators with 0.8V internal reference and feedback voltage. The LTC1706-81 produces an output voltage ranging from 1.3V to 2.05V in 50mV steps and from 2.1V to 3.5V in ...

Page 6

... GND Float Float Float * Represents codes without a defined output voltage as specified in Intel specifications. The LTC1706-81 interprets these codes as a valid input and produces an output voltage as follows: (11111 program output voltages higher than 2.05V, the range VID0 OUTPUT bit should be set high (VID4 = High). In this range, when the four VID inputs are low, the output is 3 ...

Page 7

... U In other words, each VID input has a typical pull-up current for a 3.3V system. Besides the LTC1629, the LTC1706-81 also programs a whole family of LTC DC/DC converters that have an onboard 0.8V reference. The LTC1628, LTC1735, LTC1622, LTC1772 and LTC1929 are just a few of the high efficiency ...

Page 8

... LTC1706-81 U TYPICAL APPLICATION OPTIONAL SYNC CLOCK VID0 6 SENSE 2 VID1 FROM 3 LTC1706-81 VID2 P 4 VID3 VID4 GND 9 0. M12: FDS7760A SUMIDA CEPH149-IROMC D7 TO D10: CENTROI CMDSH-3TR C : KEMET T510X477M006AS OUT f : 200kHz SW RELATED PARTS PART NUMBER DESCRIPTION LTC1622 ...

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