LTC1706-63
5-Bit VID Voltage
Programmer for Sun CPUs
FEATURES
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DESCRIPTIO
Programs Regulator Output Voltage Range from
1.025V to 1.4125V in 12.5mV Steps
Programs a Wide Range of Linear Technology
DC/DC Converters with a 0.6V Reference
±0.35%
Accurate Output Voltage
Built-In 40k Pull-Up Resistors on VID Inputs
Available in MSOP-10 Package
The LTC
®
1706-63 is a precision, digitally programmed,
resistive ladder which adjusts the output of any 0.6V
referenced regulator. Depending on the state of the five
VID inputs, an output voltage between 1.025V and 1.4125V
is programmed in 12.5mV increments.
The LTC1706-63 is designed specifically to program
an entire family of Linear Technology DC/DC converters
with on board 0.6V references. Please see the related parts
list at the end of the data sheet.
For a 2-phase synchronous controller with on-board
LTC1706-63, see the LTC3819.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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Sun
TM
Processor Power Supply
Workstations and Servers
Large Memory Array Supply
TYPICAL APPLICATIO
5-Bit VID-Controlled High Current Application (Simplified Block Diagram)
V
IN
4.5V TO 22V
V
IN
LTC1629-6
VID0
VID1
FROM
µP
V
CC
SENSE
TG1
SW1
INTV
CC
V
DIFFOUT
SGND
FB
GND
EAIN
I
TH
TG2
SW2
BG2
V
IN
4.5V TO 22V
V
IN
LTC1629-6
TG1
SW1
BG1
PGND
SGND
EAIN
I
TH
TG2
SW2
BG2
1706-63 TA01
L1
BG1
PGND
V
IN
VID2 LTC1706-63
VID3
VID4
L2
L3
V
IN
L4
U
R
SENSE1
U
U
+
V
OUT
1.025V TO 1.4125V
UP TO 80A
C
OUT
R
SENSE2
R
SENSE3
R
SENSE4
170663f
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
