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LTC1706-81 Datasheet(PDF) 6 Page - Linear Technology

Part No. LTC1706-81
Description  5-Bit Desktop VID Voltage Programmer
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1706-81 Datasheet(HTML) 6 Page - Linear Technology

   
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LTC1706-81
Table 1. VID Inputs and Corresponding Output Voltage
CODE
VID4
VID3
VID2
VID1
VID0
OUTPUT
10000
Float
GND
GND
GND
GND
3.5V
10001
Float
GND
GND
GND
Float
3.4V
10010
Float
GND
GND
Float
GND
3.3V
10011
Float
GND
GND
Float
Float
3.2V
10100
Float
GND
Float
GND
GND
3.1V
10101
Float
GND
Float
GND
Float
3.0V
10110
Float
GND
Float
Float
GND
2.9V
10111
Float
GND
Float
Float
Float
2.8V
11000
Float
Float
GND
GND
GND
2.7V
11001
Float
Float
GND
GND
Float
2.6V
11010
Float
Float
GND
Float
GND
2.5V
11011
Float
Float
GND
Float
Float
2.4V
11100
Float
Float
Float
GND
GND
2.3V
11101
Float
Float
Float
GND
Float
2.2V
11110
Float
Float
Float
Float
GND
2.1V
11111
Float
Float
Float
Float
Float
*
00000
GND
GND
GND
GND
GND
2.05V
00001
GND
GND
GND
GND
Float
2.00V
00010
GND
GND
GND
Float
GND
1.95V
00011
GND
GND
GND
Float
Float
1.90V
00100
GND
GND
Float
GND
GND
1.85V
00101
GND
GND
Float
GND
Float
1.80V
00110
GND
GND
Float
Float
GND
1.75V
00111
GND
GND
Float
Float
Float
1.70V
01000
GND
Float
GND
GND
GND
1.65V
01001
GND
Float
GND
GND
Float
1.60V
01010
GND
Float
GND
Float
GND
1.55V
01011
GND
Float
GND
Float
Float
1.50V
01100
GND
Float
Float
GND
GND
1.45V
01101
GND
Float
Float
GND
Float
1.40V
01110
GND
Float
Float
Float
GND
1.35V
01111
GND
Float
Float
Float
Float
1.30V
* 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) = 2V
OPERATIO
To program output voltages higher than 2.05V, the range
bit should be set high (VID4 = High). In this range, when
the four VID inputs are low, the output is 3.5V. Each
increasing binary count is equivalent to a decrease of
100mV in the output voltage.
When all five VID inputs are high or floating, such as when
no CPU is present in a system, a regulated 2V output is
generated at VSENSE.
Each VID input pin is pulled up by a 40k resistor in series
with a diode connected to VCC. Therefore, it should be
grounded (or driven low) to produce a digital low input. It
can either be floated or connected to VCC to get a digital
high input. The series diode is included to prevent the
input from being damaged or clamped when it is driven
higher than VCC.
Voltage Sensing and Feedback Pins
The FB pin is a high impedance node that requires mini-
mum layout distance to reduce extra loading and
unwanted stray pickup.
When used with the LTC1629 or LTC1929, the
LTC1706-81’s FB, SENSE, VCC and GND pins should be
connected, respectively, with the EAIN, VDIFFOUT, INTVCC
and SGND pins of the LTC1629 and LTC1929. The result
of this application is a precisely controlled, multiphase,
variable output voltage supply to any low voltage, high
current system such as a powerful personal computer,
workstation or network server. True remote sense capa-
bility is retained in this case.
VID Input Characteristics
The VID inputs should be driven with a maximum VIL of
0.4V and a minimum VIH of 1.6V. However, the VID input
range is not limited to values less than VCC. Because of the
internal diode between VCC and the pull-up resistor, the
inputs can go higher than VCC without being clamped to
VCC or damaging the input.
This allows the LTC1706-81 to be fully logic compatible
and operational over a higher input voltage range (less
than the 7V absolute maximum rating).


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