LTC1706-61 Datasheet PDF - Linear
| Part Number | LTC1706-61 | |
| Description | 5-Bit VID Voltage Programmer | |
| Manufacturers | Linear | |
| Logo |  |
|
|
There is a preview and LTC1706-61 download ( pdf file ) link at the bottom of this page. Total 8 Pages | ||
Preview 1 page No Preview Available !
FEATURES
s Programs Regulator Output Voltage Range from
0.8V to 1.55V in 25mV Steps
s Programs a Wide Range of Linear Technology
DC/DC Converters with a 0.6V Reference
s ±0.35% Accurate Output Voltage
s Built-In 40k Pull-Up Resistors on VID Inputs
s Available in MSOP-10 Package
U
APPLICATIO S
s AMD OpteronTM Processor Power Supply
s Workstations and Servers
s Large Memory Array Supply
LTC1706-61
5-Bit VID Voltage
Programmer for AMD
Opteron CPUs
DESCRIPTIO
The LTC®1706-61 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 0.8V and 1.55V is
programmed in 25mV increments.
The LTC1706-61 is designed specifically to program
an entire family of Linear Technology DC/DC converters
with on board 0.6V references.
The LTC1706-61 programs the following Linear
Technology DC/DC converter products: LTC1629-6,
LTC3714, LTC3731 and LTC3778. (Consult factory for
additional DC/DC converter products.)
, LTC and LT are registered trademarks of Linear Technology Corporation.
AMD Opteron is a trademark of Advanced Micro Devices, Inc.
TYPICAL APPLICATIO
5-Bit VID-Controlled High Current Application (Simplified Block Diagram)
FROM
µP
VID0 VCC
VID1
SENSE
VID2 LTC1706-61
VID3
FB
VID4 GND
VIN
4.5V TO 22V
VIN
LTC1629-6 TG1
SW1
L1 RSENSE1
INTVCC
BG1
VDIFFOUT
PGND
VIN
SGND
EAIN
ITH
TG2
SW2
BG2
L2 RSENSE2
VIN
4.5V TO 22V
VOUT
0.8V TO 1.55V
+ UP TO 80A
COUT
LTC1629-6
VIN
TG1
SW1
BG1
SGND
EAIN
ITH
PGND
TG2
SW2
BG2
L3 RSENSE3
VIN
L4 RSENSE4
1706-61 TA01
170661f
1
|
| |
 
U
OPERATIO
VID Programming
A list of programmed inputs and their corresponding
output voltages is shown in Table 1. Programming is
accomplished by applying the proper voltage (or float
condition) on the five digital VID inputs.
Table 1. VID Inputs and Corresponding Output Voltage
CODE VID4 VID3 VID2 VID1 VID0 OUTPUT
00000 GND GND GND GND GND 1.550V
00001 GND GND GND GND Float 1.525V
00010 GND GND GND Float GND 1.500V
00011 GND GND GND Float Float 1.475V
00100 GND GND Float GND GND 1.450V
00101 GND GND Float GND Float 1.425V
00110 GND GND Float Float GND 1.400V
00111 GND GND Float Float Float 1.375V
01000 GND Float GND GND GND 1.350V
01001 GND Float GND GND Float 1.325V
01010 GND Float GND Float GND 1.300V
01011 GND Float GND Float Float 1.275V
01100 GND Float Float GND GND 1.250V
01101 GND Float Float GND Float 1.225V
01110 GND Float Float Float GND 1.200V
01111 GND Float Float Float Float 1.175V
10000 Float GND GND GND GND 1.150V
10001 Float GND GND GND Float 1.125V
10010 Float GND GND Float GND 1.100V
10011 Float GND GND Float Float 1.075V
10100 Float GND Float GND GND 1.050V
10101 Float GND Float GND Float 1.025V
10110 Float GND Float Float GND 1.000V
10111 Float GND Float Float Float 0.975V
11000 Float Float GND GND GND 0.950V
11001 Float Float GND GND Float 0.925V
11010 Float Float GND Float GND 0.900V
11011 Float Float GND Float Float 0.875V
11100 Float Float Float GND GND 0.850V
11101 Float Float Float GND Float 0.825V
11110 Float Float Float Float GND 0.800V
11111 Float Float Float Float Float *0.775V
*Represents codes without a defined output (shutdown) voltage as
specified in AMD specifications. The LTC1706-61 interprets these codes
as a valid input and produces an output voltage as follows:
(11111) = 0.775V.
LTC1706-61
When all five VID inputs are high or floating, such as when
no CPU is present in a system, a regulated 0.775V 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 LTC1629-6, the LTC1706-61’s FB,
SENSE, VCC and GND pins should be connected, respec-
tively, with the EAIN, VDIFFOUT, INTVCC and SGND pins of
the LTC1629-6. The result of this application is a precisely
controlled, variable output voltage supply to any low
voltage, high current system such as a powerful personal
computer, workstation or network server.
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 LTC1706-61 to be fully logic compatible
and operational over a higher input voltage range (less
than the 7V absolute maximum rating).
When a VID input is grounded, there will be a higher
quiescent current flow from VCC because of a resistor from
VCC through a series diode to each one of the inputs. This
increase in quiescent current is calculated from:
IQ = N(VCC – VDIODE)/RPULLUP
N is the number of grounded VID inputs. VDIODE is typically
0.6V while RPULLUP has a typical pull-up resistance of
40kΩ.
170661f
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC1706-61 electronic component. |
| Information | Total 8 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LTC1706-61.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| LTC1706-61 | The function is 5-Bit VID Voltage Programmer. Linear | |
| LTC1706-63 | The function is 5-Bit VID Voltage Programmer. Linear | |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
LTC1
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||