LTC1706EMS-82 [Linear]
VID Voltage Programmer for Intel VRM 9.0; VID电压编程英特尔VRM 9.0
| 型号： | LTC1706EMS-82 |
| 厂家： | 
Linear |
| 描述： | VID Voltage Programmer for Intel VRM 9.0 |
| 文件： | 总8页 (文件大小：152K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Final Electrical Specifications
LTC1706-82
VID Voltage Programmer
for Intel VRM 9.0
January 2000
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DESCRIPTIO
FEATURES
The LTC®1706-82 is a precision, digitally programmed,
resistive ladder which adjusts the output of any 0.8V
referenced regulator. Depending on the state of the five
VID inputs, an output voltage between 1.10V and 1.85V is
programmed in 25mV increments.
■
Fully Compliant with the Intel VRM 9.0 VID
Specification
■
Programs Regulator Output Voltage from 1.10V to
1.85V in 25mV Steps
Programs an Entire Family of Linear Technology
DC/DC Converters
±0.25% Accurate Voltage Divider
Built-In 40k Pull-Up Resistors on Program Inputs
Available in MSOP-10 Packaging
■
The LTC1706-82 is designed specifically to program an
entirefamilyofLinearTechnologyDC/DCconvertersinfull
compliance with the Intel Desktop VID specification.
■
■
■
The LTC1706-82 programs the following Linear Technol-
ogy DC/DC converter products: LTC1622, LTC1628,
LTC1629, LTC1702, LTC1735, LTC1735-1, LTC1772 and
LTC1929.
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APPLICATIO S
Intel Pentium® III Processor Power Supply
■
■
Consult factory for future compatible DC/DC converter
Multiprocessor Workstations and Servers
■
products.
Multiphase Processor Power Supply
AMD AthlonTM Processor Power Supply
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Pentium is a registered trademark of Intel Corporation.
AMD Athlon is a trademark of Advanced Micro Devices, Inc.
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TYPICAL APPLICATIO
VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram)
V
IN
4.5V TO 22V
V
IN
TG1
SW1
INTV
V
CC
L1
L2
R
R
V
SENSE1
SENSE2
OUT
1.10V TO 1.85V
UP TO 70A
V
CC
LTC1629
VID0
VID1
VID2
VID3
VID4
+
BG1
C
OUT
SENSE
V
DIFFOUT
SGND
IN
PGND
FROM
µP
LTC1706-82
TG2
SW2
BG2
FB
EAIN
GND
V
IN
4.5V TO 22V
V
IN
LTC1629
TG1
SW1
R
L3
L4
SENSE3
BG1
V
IN
PGND
SGND
EAIN
TG2
SW2
BG2
R
SENSE4
UP TO SIX LTC1629s CAN BE PARALLELED
TO DELIVER AS MUCH AS 200A
1706-82 TA01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
1
LTC1706-82
W W
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
(Voltages Referred to GND Pin)
TOP VIEW
NUMBER
Input Supply Voltage (VCC) ..........................–0.3V to 7V
VID Input Pins .............................................–0.3V to 7V
SENSE Pin ...................................................–0.3V to 7V
FB Pin ..........................................................–0.3V to 7V
Operating Temperature Range (Note 2) .. –40°C to 85°C
Junction Temperature........................................... 110°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
VID0
VID1
VID2
VID3
1
2
3
4
5
10 FB
9
8
7
6
GND
LTC1706EMS-82
NC
VID4
SENSE
V
CC
MS10
PART MARKING
MS10 PACKAGE
10-LEAD PLASTIC MSOP
LTMJ
TJMAX = 110°C, θJA = 120°C/W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
2.7V ≤ VCC ≤ 5.5V, VIDO = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
V
V
Operating Supply Voltage Range
Supply Current
2.7
CC
I
(Note 3)
0.1
10
5.0
µA
VCC
R
Resistance Between SENSE and FB
Output Voltage Accuracy
VID Input Pull-Up Resistance
VID Input Voltage Threshold
●
●
6
14
kΩ
%
FB-SENSE
V
Error %
Programmed From 1.10V to 1.85V
–0.25
0.25
OUT
R
V
= 0.6V, (Note 4)
DIODE
40
kΩ
PULLUP
VID
V
V
(2.7V < V < 5.5V)
0.4
V
V
T
IL
CC
(2.7V < V < 5.5V)
1.6
IH
CC
I
VID Input Leakage Current
VID Pull-Up Voltage
V
< VID < 7V, (Note 4)
0.01
±1.00
µA
VID-LEAK
CC
V
V
V
= 3.3V
= 5V
2.8
4.5
V
V
PULLUP
CC
CC
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 3: With all five VID inputs floating, the V supply current is simply
CC
the device leakage current. However, the V supply current will rise and
CC
be approximately equal to the number of grounded VID input pins times
Note 2: The LTC1706-82 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
(V – 0.6V)/40k. (See the Applications Information section for more
CC
detail.)
Note 4: Each built-in pull-up resistor attached to the VID inputs also has a
series diode connected to V to allow input voltages higher than the V
CC
CC
supply without damage or clamping. (See Operation section for further
details.)
2
LTC1706-82
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TYPICAL PERFOR A CE CHARACTERISTICS
Typical Error % vs Output Voltage
Typical Error % vs Temperature
0.25
0.25
T
= 25°C
A
V
OUT
= 1.1V
V
OUT
= 1.5V
V
OUT
= 1.85V
0
0
–0.25
–0.25
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
OUTPUT VOLTAGE (V)
–50
0
50
100
TEMPERATURE (°C)
1706-82 G01
1706-82 G02
RFB1 vs Temperature
IVID-PULLUP vs Temperature
120
100
80
60
40
20
0
30
20
10
0
V
= 5V
CC
VID4 = 0V
VID0 = VID1 = VID2 = VID3 = OPEN
–50
0
50
100
–50
0
50
100
TEMPERATURE (°C)
TEMPERATURE (°C)
1706-82 G04
1706-82 G03
Supply Current vs Temperature
Supply Current vs Supply Voltage
2.0
1.5
1.0
0.5
0
5
4
3
2
1
0
ALL VID INPUTS OPEN
ALL VID INPUTS OPEN
A
T
= 25°C
V
CC
= 5V
V
CC
= 3.3V
V
CC
= 2.7V
–50
0
50
100
0
2
4
6
8
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
1706-82 G05
1706-82 G06
3
LTC1706-82
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PI FU CTIO S
VID0 (Pin 1): LSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID0 adds 25mV to the
output sense voltage.
SENSE (Pin 6): Regulator Output Voltage. Connect di-
rectly to regulator output sense node or VDIFFOUT when
used with the LTC1629 and LTC1929.
VID1 (Pin 2): 4th MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID1 adds 50mV to the
output sense voltage.
VID4 (Pin 7): MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID4 adds 400mV to the
output sense voltage.
VID2 (Pin 3): 3rd MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID2 adds 100mV to the
output sense voltage.
NC (PIN 8): No Connect.
GND (Pin 9): Ground. Connect to regulator signal ground.
FB(Pin10):FeedbackInput. Connecttothe0.8Vfeedback
pin of a compatible regulator or the EAIN pin of the
LTC1629 and LTC1929.
VID3 (Pin 4): 2nd MSB Programming Input. Low = GND,
High = VCC or Float. Grounding VID3 adds 200mV to the
output sense voltage.
VCC (Pin 5): Power Supply Voltage. Range from 2.7V to
5.5V.
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PI TABLE
NOMINAL (V)
TYP
ABSOLUTE MAX (V)
PIN
1
NAME
VID0
VID1
VID2
VID3
DESCRIPTION
MIN
MAX
MIN
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
MAX
LSB Programmable Input
3rd MSB Programmable Input
2nd MSB Programmable Input
1st MSB Programmable Input
Power Supply
0
0
V
V
V
V
7
7
7
7
7
7
7
CC
CC
CC
CC
2
3
0
4
0
5
V
2.7
1.075
0
5.5
CC
6
SENSE
VID4
NC
Regulator Output Voltage
MSB Programmable Input
1.85
7
V
CC
8
9
GND
FB
Ground
0
–0.3
–0.3
7
7
10
0.8V Feedback Input
0
0.8
1.5
4
LTC1706-82
W
BLOCK DIAGRA
V
V
V
V
CC
CC
CC
CC
40k
40k
40k
40k
VID0
VID1
VID2
VID3
1
2
3
4
V
CC
5
6
10
9
SENSE
FB
R
FB1
10k
SWITCH
CONTROL
LOGIC
R
FB2
GND
1706-82 BD
V
CC
40k
VID4
7
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OPERATIO
The LTC1706-82 is a precision resistive divider designed
specifically for use with an entire family of Linear Technol-
ogy Corporation DC/DC switching regulators with 0.8V
internalreferenceandfeedbackvoltages.TheLTC1706-82
produces an output voltage ranging from 1.10V to 1.85V
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.
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. VID4 is the most
significant bit (MSB) and VID0 is the least significant bit
(LSB).
When the five VID inputs are low, or grounded, the
regulator output voltage is set to 1.85V. Each increasing
binary count is equivalent to a decrease of 25mV in the
output voltage. Therefore, to obtain a 1.10V output, only
VID0 is grounded while the other four VID inputs are tied
high or floating.
The “top” feedback resistor, RFB1, connected between
SENSE and FB, is typically 10k and is not modified by the
state of the VID program inputs.
The “bottom” feedback resistor, RFB2, however is modi-
fied by the five VID inputs and is precisely ratioed to RFB1
.
When all five VID inputs are high or floating, such as when
no CPU is present in a system, a regulated 1.075V output
is generated at VSENSE
.
5
LTC1706-82
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OPERATIO
Table 1. VID Inputs and Corresponding Output Voltage
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 be either floated or connected to VCC to get a digital
highinput.Theseriesdiodeisincludedtopreventtheinput
from being damaged or clamped when it is driven higher
than VCC.
CODE
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
VID4
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
VID3
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
VID2
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
VID1
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
VID0
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
OUTPUT
1.850
1.825
1.800
1.775V
1.750V
1.725V
1.700V
1.675V
1.650V
1.625V
1.600V
1.575V
1.550V
1.525V
1.500V
1.475V
1.450V
1.425V
1.400V
1.375V
1.350V
1.325V
1.300V
1.275V
1.250V
1.250V
1.200V
1.175V
1.150V
1.125V
1.100V
Voltage Sensing and Feedback Pins
The FB pin is a high impedance node that requires mini-
mum layout distance to reduce extra loading and un-
wanted stray pickup.
When used with the LTC1629, the LTC1706-82’s FB,
SENSE, VCC and GND pins should be connected, respec-
tively, with the EAIN, VDIFFOUT, INTVCC, and SGND pins of
the LTC1629. 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 capability of the LTC1629 is also 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 LTC1706-82 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
quiescentcurrentflowfromVccbecauseofaresistorfrom
Vcc through a series diode to each one of the VID inputs.
This increase in quiescent current is calculated from
NO_CPU
(1.075V)
IQ = N(VCC – VDIODE)/RPULLUP
NisthenumberofgroundedVIDinputs.VDIODE istypically
0.6V while RPULLUP has a typical pullup resistance of 40k.
Inotherwords, eachVIDinputhasatypicalpullupcurrent
of(VCC –0.6)/40K, whichisapproximately68µAfora3.3V
system.
6
LTC1706-82
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APPLICATIO S I FOR ATIO
Besides the LTC1629, the LTC1706-82 also programs a
wholefamilyofLTCDC/DCconvertersthathaveanonboard
0.8V reference. The LTC1628, LTC1735, LTC1622,
LTC1702, LTC1772 and LTC1929 are just a few of the high
efficiency step-down switching regulators that will work
equally well with the LTC1706-82.
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PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
MS10 Package
10-Lead Plastic MSOP
(LTC DWG # 05-08-1661)
0.118 ± 0.004*
(3.00 ± 0.102)
10 9
8
7 6
0.040 ± 0.006
(1.02 ± 0.15)
0.034 ± 0.004
(0.86 ± 0.102)
0.007
(0.18)
0° – 6° TYP
0.118 ± 0.004**
(3.00 ± 0.102)
SEATING
PLANE
0.193 ± 0.006
(4.90 ± 0.15)
0.009
(0.228)
REF
0.021 ± 0.006
(0.53 ± 0.015)
0.006 ± 0.004
(0.15 ± 0.102)
0.0197
(0.50)
BSC
MSOP (MS10) 1098
1
2
3
4 5
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
7
LTC1706-82
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TYPICAL APPLICATIO
VID Controlled High Current 70A 4-Phase Power Supply
OPTIONAL SYNC
CLOCK IN
L1
1
2
3
4
5
6
7
8
9
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RUN/SS
SENSE1
SENSE1
EAIN
CLKOUT
TG1
5V
+
–
0.003Ω
0.33µF
SW1
1000pF
0.47µF
D1
M1
BOOST1
MBRS
340T3
10Ω
5
PLLFLTR
PLLIN
V
IN
M2
M3
V
CC
1µF
1
2
3
4
7
BG1
VID0
VID1
VID2
VID3
VID4
0.33µF
100pF
6
150µF, 16V
× 2
1µF
25V
PHASMD
SENSE
EXTV
CC
D7
D8
+
V
OUT
LTC1629
22µF
6.3V
I
× 3
1.10V TO
1.85V
70A
+
TH
INTV
CC
6800pF
1000pF
FROM
µP
47k
470µF, 6.3V
KEMET CAP
+
GND
LTC1706-82
SGND
PGND
BG2
10
11
12
13
14
V
V
V
DIFFOUT
10
–
FB
D2
M4
OS
BOOST2
SW2
MBRS
340T3
0.47µF
+
OS
M5
GND
9
M6
–
SENSE2
SENSE2
TG2
0.003Ω
+
AMPMD
L2
24k
75k
L3
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RUN/SS
CLKOUT
TG1
5V
0.003Ω
+
SENSE1
SENSE1
EAIN
3
–
SW1
47pF
D3
1000pF
4
0.47µF
BOOST1
MBRS
340T3
M7
10k
10Ω
5
PLLFLTR
PLLIN
V
IN
M9
M8
0.01µF
1µF
6
× 3
470µF, 6.3V
KEMET CAP
BG1
1nF
150µF, 16V
× 2
7
PHASMD
EXTV
CC
1µF
25V
D9
8
LTC1629
22µF
6.3V
I
TH
INTV
CC
+
+
100pF
+
9
D10
GND
SGND
PGND
BG2
V
IN
12V
10
11
12
13
14
NC
V
V
V
DIFFOUT
–
D4
BOOST2
SW2
M10
OS
0.47µF
MBRS
340T3
+
M12
M11
OS
V
V
: 12V
IN
1000pF
–
: 1.1V TO 1.85, 70A
OUT
SENSE2
SENSE2
TG2
M1 TO M12: FDS7760A
L1 TO L4: 1µH SUMIDA CEPH149-IROMC
0.003Ω
+
AMPMD
D7 TO D10: CENTROL CMDSH-3TR
L4
C
: KEMET T510X477M006AS
OUT
1706-82 TA02
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Burst Mode, PolyPhase and No R
are trademarks of Linear Technology Corporation.
SENSE
170682i LT/TP 0100 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2000
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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LTC1707 - High Efficiency Monolithic Synchronous Step-Down Switching Regulator; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LTC1707CS8#TRPBF
LTC1707 - High Efficiency Monolithic Synchronous Step-Down Switching Regulator; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C
Linear
LTC1707DFN#PBF
IC 1.5 A SWITCHING REGULATOR, 385 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or Controller
Linear
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