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PDF LTC1706-63 Data sheet ( Hoja de datos )
| Número de pieza | LTC1706-63 | |
| Descripción | 5-Bit VID Voltage Programmer | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC1706-63
5-Bit VID Voltage
Programmer for Sun CPUs
FEATURES
■ 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
U
APPLICATIO S
■ SunTM Processor Power Supply
■ Workstations and Servers
■ Large Memory Array Supply
DESCRIPTIO
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.
TYPICAL APPLICATIO
FROM
µP
5-Bit VID-Controlled High Current Application (Simplified Block Diagram)
VID0 VCC
VID1 SENSE
VID2 LTC1706-63
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
1.025V TO 1.4125V
+ UP TO 80A
COUT
LTC1629-6
VIN
TG1
SW1
BG1
SGND
EAIN
ITH
PGND
TG2
SW2
BG2
L3 RSENSE3
VIN
L4 RSENSE4
1706-63 TA01
170663f
1
1 page  
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 1.4125V
00001 GND GND GND GND Float 1.4000V
00010 GND GND GND Float GND 1.3875V
00011 GND GND GND Float Float 1.3750V
00100 GND GND Float GND GND 1.3625V
00101 GND GND Float GND Float 1.3500V
00110 GND GND Float Float GND 1.3375V
00111 GND GND Float Float Float 1.3250V
01000 GND Float GND GND GND 1.3125V
01001 GND Float GND GND Float 1.3000V
01010 GND Float GND Float GND 1.2875V
01011 GND Float GND Float Float 1.2750V
01100 GND Float Float GND GND 1.2625V
01101 GND Float Float GND Float 1.2500V
01110 GND Float Float Float GND 1.2375V
01111 GND Float Float Float Float 1.2250V
10000 Float GND GND GND GND 1.2125V
10001 Float GND GND GND Float 1.2000V
10010 Float GND GND Float GND 1.1875V
10011 Float GND GND Float Float 1.1750V
10100 Float GND Float GND GND 1.1625V
10101 Float GND Float GND Float 1.1500V
10110 Float GND Float Float GND 1.1375V
10111 Float GND Float Float Float 1.1250V
11000 Float Float GND GND GND 1.1125V
11001 Float Float GND GND Float 1.1000V
11010 Float Float GND Float GND 1.0875V
11011 Float Float GND Float Float 1.0750V
11100 Float Float Float GND GND 1.0625V
11101 Float Float Float GND Float 1.0500V
11110 Float Float Float Float GND 1.0375V
11111 Float Float Float Float Float 1.0250V
LTC1706-63
When all five VID inputs are high or floating, such as when
no CPU is present in a system, a regulated 1.025V 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 LTC1706-63’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 LTC1706-63 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.
170663f
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1706-63.PDF ] | |
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