ltc1706-61 Linear Technology Corporation, ltc1706-61 Datasheet - Page 4

• Manufacturer Part Number: ltc1706-61
• Description: 5-bit Vid Voltage Programmer For Amd Opteron Cpus
• Manufacturer: Linear Technology Corporation

PIN
OPERATIO
LTC1706-61
PIN
1
2
3
4
5
6
7
8
9
10
BLOCK DIAGRA
The LTC1706-61 is a precision resistive divider designed
specifically for use with an entire family of Linear
Technology Corporation DC/DC switching regulators with
0.6V internal reference and feedback voltage. The
LTC1706-61 produces an output voltage ranging from
0.8V to 1.55V in 25mV steps by closing the loop between
the output voltage sense and the feedback input of the
regulator with the appropriate resistive divider network.
4
U
FUNCTIONS
U
NAME
VID0
VID1
VID2
VID3
V
SENSE
VID4
NC
GND
FB
CC
U
U
VID0
VID1
VID2
VID3
1
2
3
4
W
V
V
V
V
CC
CC
CC
CC
40k
40k
40k
40k
LSB Programmable Input
4th MSB Programmable Input
3rd MSB Programmable Input
2nd MSB Programmable Input
Regulator Output Voltage
1st MSB Programmable Input
DESCRIPTION
Power Supply
Ground
0.6V Feedback Input
VID4
7
V
CC
40k
The “top” feedback resistor, R
SENSE and FB, is typically 10k and is not modified by the
state of the VID program inputs.
The “bottom” feedback resistor, R
fied by the five VID inputs and is precisely ratioed to R
CONTROL
SWITCH
LOGIC
V
CC
5
MIN
2.7
0.8
0
0
0
0
0
0
NOMINAL (V)
TYP
0.6
0
R
R
FB1
FB2
MAX
1.55
V
V
V
V
V
5.5
1.5
CC
CC
CC
CC
CC
10
6
9
1706-61 BD
FB1
SENSE
FB
GND
FB2
, connected between
, however, is modi-
ABSOLUTE MAX (V)
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
MIN
MAX
7
7
7
7
7
7
7
7
7
170661f
FB1
.