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LTC1706-85 VID Voltage Programmer for Intel VRM 8.5
FEATURES
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DESCRIPTIO
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Fully Compliant with the Intel VRM 8.5 VID Specification Programs Regulator Output Voltage from 1.05V to 1.825V in 25mV Steps Programs an Entire Family of Linear Technology DC/DC Converters with 0.8V References 0.25% Voltage Programming Accuracy Built-In 40k Pull-Up Resistors on Program Inputs Available in MSOP-10 Packaging
The LTC(R)1706-85 is a precision, digitally programmed resistive ladder which adjusts the output of any 0.8Vreferenced regulator. Depending on the state of the five VID inputs, an output voltage between 1.05V and 1.825V is programmed in 25mV increments. The LTC1706-85 is designed specifically to program an entire family of Linear Technology DC/DC converters in full compliance with the Intel Voltage Regulator Module (VRM) 8.5 specification. The LTC1706-85 programs the following Linear Technology DC/DC converter products: LTC1622, LTC1628, LTC1629, LTC1702, LTC1735, LTC1735-1, LTC1772, LTC1773, LTC1778, LTC1929, LTC3728 and LTC3729. Consult factory for additional DC/DC converter products compatible with the LTC1706-85.
, LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
APPLICATIO S
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Server/Desktop Computers Multiprocessor Workstations and Servers Multiphase Processor Power Supply
TYPICAL APPLICATIO
VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram)
VIN 4.5V TO 22V VOS+ INTVCC VID25 VID0 FROM P VCC SENSE LTC1629 VDIFFOUT SGND FB GND EAIN ITH CLKOUT TG2 SW2 BG2 VIN 4.5V TO 22V PLLIN LTC1929 VIN TG1 SW1 BG1 PGND SGND EAIN ITH NOTE: UP TO SIX LTC1629s/LTC1929s CAN BE PARALLELED TO DELIVER AS MUCH AS 200A TG2 SW2 BG2
1706-85 TA01
VOS-
VIN TG1 SW1 BG1 PGND VIN RSENSE1 VOUT 1.05V TO 1.825V UP TO 80A COUT
VID1 LTC1706-85 VID2 VID3
RSENSE2
RSENSE3
VIN
RSENSE4
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LTC1706-85
ABSOLUTE
(Notes 1, 2)
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PACKAGE/ORDER I FOR ATIO
TOP VIEW VID25 VID0 VID1 VID2 VCC 1 2 3 4 5 10 9 8 7 6 FB GND NC VID3 SENSE
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 3) .. - 40C to 85C Junction Temperature ........................................... 110C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC1706EMS-85 MS PART MARKING LTYQ
MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 110C, JA = 200C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. 2.7V VCC 5.5V, VID25 = VID0 = VID1 = VID2 = VID3 = NC unless otherwise noted. (Note 3)
SYMBOL VCC IVCC RFB1 VOUT(ERROR) RPULLUP VIH VIL IIN PARAMETER Operating Supply Voltage Range Supply Current Resistance Between SENSE and FB Output Voltage Accuracy Pull-Up Resistance on VID Minimum High Level Input Voltage (VID Inputs) Maximum Low Level Input Voltage (VID Inputs) Input Leakage Current (VID Inputs) 1.050 VSENSE 1.825V VDIODE = 0.6V (Note 5) VCC = 3.3V VCC = 3.3V VCC < VID < 7V (Note 5) 0.01 (Note 4)
q q
CONDITIONS
MIN 2.7
TYP 1
MAX 5.5 10 14 0.25 56 0.8 1
UNITS V A k % k V V A
6 - 0.25 28 2
10 40
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All voltages are with respect to GND pin. Note 3: The LTC1706-85 is guaranteed to meet performance specifications from 0C to 70C. Specifications over the - 40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: Supply current is specified with all VID inputs floating. Due to the internal pull-ups on the VID pins, the supply current will increase
depending on the number of grounded VID lines. Each grounded VID line will draw approximately [(VCC - 0.6)/40]mA. If the VID inputs are left unconnected, they will float to VCC at a rate controlled by parasitic capacitance. Until the VID inputs reach their final states, slightly higher IVCC current may be observed. (See the Operation section for more detail.) Note 5: Each built-in pull-up resistor attached to the VID inputs also has a series diode connected to VCC to allow input voltages higher than the VCC supply without damage or clamping. (See Operation section for further details.)
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WW
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LTC1706-85 TYPICAL PERFOR A CE CHARACTERISTICS
Typical Error % vs Output Voltage
0.25 TA = 25C 0.25
ERROR (%)
0
ERROR (%)
-0.25 1.0 1.2 1.6 1.4 OUTPUT VOLTAGE (V) 1.8
1706-85 G01
RFB1 vs Temperature
10.10 70
10.05
VID PULL-UP CURRENT (A)
RFB1 (k)
10.00
9.95
9.90 -50
Supply Current vs Temperature
1.0 ALL VID INPUTS OPEN 1.0
SUPPLY CURRENT (A)
VCC = 5V 0.5 VCC = 3.3V
SUPPLY CURRENT (A)
0 -50
UW
Typical Error % vs Temperature
VOUT = 1.05V
VOUT = 1.325V VOUT = 1.825V
0
-0.25 -50
0 50 TEMPERATURE (C)
100
1706-85 G02
VID Pullup Current vs Temperature
VCC = 3.3V VID PIN UNDER TEST = 0V
65
60
0 50 TEMPERATURE (C)
100
1706-85 G03
55 -50
0 50 TEMPERATURE (C)
100
1706-85 G04
Supply Current vs Supply Voltage
ALL VID INPUTS OPEN TA = 25C
0.5
VCC = 2.7V 0 2.5
0 50 TEMPERATURE (C)
100
1706-85 G05
3.0
3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
5.5
6.0
1706-85 G06
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LTC1706-85
PI FU CTIO S
VID25 (Pin 1): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of P. VID0 (Pin 2): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of P. VID1 (Pin 3): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of P. VID2 (Pin 4): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of P. VCC (Pin 5): Power Supply Voltage. May range from 2.7V to 5.5V. SENSE (Pin 6): Regulator Output Voltage. Connect directly to regulator output sense node or VDIFFOUT when used with the LTC1929 or LTC1629. VID3 (Pin 7): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of P. NC (PIN 8): No Connect. GND (Pin 9): Ground. Connect to regulator signal ground. FB (Pin 10): Feedback Input. Connect to the 0.8V feedback pin of a compatible regulator or the EAIN pin of the LTC1929 or LTC1629.
BLOCK DIAGRA
VCC
40k VID25 1 VCC VCC 5
40k VID0 2 VCC SWITCH CONTROL LOGIC 40k VID1 3 RFB2 RFB1 10k
VCC
40k VID2 4 VID3 7
4
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6
SENSE
10 FB
9
GND
1706-85 BD
VCC
40k
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LTC1706-85
OPERATIO
The LTC1706-85 is a precision programmable resistive divider designed specifically for use with an entire family of Linear Technology Corporation DC/DC switching regulators with 0.8V internal reference and feedback voltages. The LTC1706-85 programs an output voltage ranging from 1.050V to 1.825V in 25mV steps, depending on the state of the VID input pins. The LTC1706-85 in conjunction with a Linear Technology DC/DC switching regulator can be used to create a high performance voltage regulator meeting all the requirements of the Intel VRM 8.5 specification. Voltage Sensing and Feedback Pins The LTC1706-85 operates by closing the loop between the output node and the feedback node of the regulator with an appropriate resistive divider network. The "top" feedback resistor, RFB1, connected between SENSE and FB, is a fixed value of typically 10k. The "bottom" feedback resistor, RFB2, is set by the five VID inputs to generate the desired regulator output voltage. Feedback resistors R FB1 and RFB2 are matched and temperature stable in order to provide a highly accurate output voltage. The FB pin is a sensitive node in the circuit. Care should be taken to minimize the layout distance between the LTC1706-85 FB node and the regulator feedback node. In addition, it is important to keep tight ground connections between the two chips. VID Inputs The desired output voltage is obtained by applying the proper voltage or float condition to the five digital VID inputs. Table 1 shows the translation table with each input state and the corresponding regulator output voltage. This translation is derived from and adheres to the Intel VRM 8.5 specification. Each VID input is pulled up by a 40k resistor in series with a diode connected to VCC. To produce a digital low a VID
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input should be grounded or driven to a low state. The VID inputs must be driven with a maximum VIL of 0.8V (VCC = 3.3V). When a VID input is grounded or pulled low with a logic gate, the power supply current will increase because of the resistor from VCC through the series diode to the input. This increase in current is calculated from: IQ = N * (VCC - VDIODE)/RPULLUP where N is the number of grounded VID inputs. With typical values of VCC = 3.3V, VDIODE = 0.6V and RPULLUP = 40k, each grounded VIN input will sink approximately 68A. To apply a digital high state the input can be either floated, connected to VCC or driven by a logic gate. The VID inputs should be driven with a minimum VIH of 2V (VCC = 3.3V). Because of the diode between VCC and the pull-up resistor, the maximum VIH is not limited to VCC. The VID inputs can be driven higher than VCC without being clamped or damaged. This allows the LTC1706-85 to be fully logic compatible and operational over a wide input voltage range, up to the 7V absolute maximum rating. When used with the LTC1629 and LTC1929, the LTC1706-85's FB, SENSE, VCC and GND pins should be connected respectively to 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 applicable to any low output voltage system such as a personal computer, workstation or network server. In addition to the LTC1629 and LTC1929, the LTC1706-85 also programs a whole family of LTC DC/DC converters that have an onboard 0.8V reference. The LTC1628, LTC1735 and LTC1622 are just a few of the high efficiency step-down switching regulators that will work equally well with the LTC1706-85. Contact LTC Marketing for a more complete listing of compatible DC/DC regulators.
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LTC1706-85
OPERATIO
CODE 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 VID3 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND
Table 1. VID Inputs and Corresponding Output Voltage
VID2 GND GND GND GND GND GND GND GND Float Float Float Float Float Float Float Float VID1 GND GND GND GND Float Float Float Float GND GND GND GND Float Float Float Float VID0 GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float VID25 GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float VOLTAGE 1.250 1.275 1.200 1.225 1.150 1.175 1.100 1.125 1.050 1.075 1.800 1.825 1.750 1.775 1.700 1.725 CODE 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 VID3 Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float VID2 GND GND GND GND GND GND GND GND Float Float Float Float Float Float Float Float VID1 GND GND GND GND Float Float Float Float GND GND GND GND Float Float Float Float VID0 GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float VID25 GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float VOLTAGE 1.650 1.675 1.600 1.625 1.550 1.575 1.500 1.525 1.450 1.475 1.400 1.425 1.350 1.375 1.300 1.325
TYPICAL APPLICATIO S
30A, 2-Phase VID Controlled Power Supply
VIN 12V
OPTIONAL SYNC CLOCK IN
5 1 2 FROM P 3 4 7 VCC VID25 VID0 VID1 VID2 FB VID3 GND 9 SENSE LTC1706-85 10 6 100pF 10k 3300pF 100pF 0.33F
9 10 11 12
SGND VDIFFOUT VOS- VOS+ SENSE2- SENSE2
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PGND BG2 BOOST2 SW2 TG2 AMPMD
20 D8 19 18 17 16 15
1F 6.3V
0.47F M5 M6 1 3 L2
1000pF 13 14
VIN: 12V VOUT: 1.05V TO 1.825, 30A M1 TO M6: FDS7760A L1 TO L2: 1H SUMIDA CEP125-IROMC-H D7 TO D10: CENTRAL CMDSH-3TR COUT: PANASONIC EEFUEOG181R
24k
75k
10 10
6
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10 10 1 0.33F 2 3 1000pF 4 5 6 7 8 28 27 26 25 24 23 22 21 D7 22F 6.3V 1F 150F, 16V 16V x2 0.47F 10 M2 M3 M1 D1 MBRS 340T3 5V L1 RUN/SS SENSE1+ SENSE1- EAIN PLLFLTR PLLIN NC ITH LTC1929 NC TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC 3 4 1 0.003 2
+
M4
GND
x5 180F 4V
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VOUT 1.05V TO 1.825V 30A
D2 MBRS 340T3 2 4
0.003
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LTC1706-85
TYPICAL APPLICATIO S
OPTIONAL SYNC CLOCK IN
5 1 2 FROM P 3 4 7 VCC VID25 VID0 VID1 VID2 FB VID3 GND 9 SENSE LTC1706-85 10 6 100pF 10k 3300pF 100pF VOS- VOS+ 8 0.33F
9 10 11 12
SGND VDIFFOUT VOS- VOS+ SENSE2- SENSE2+
PGND BG2 BOOST2 SW2 TG2 AMPMD
20 D8 19 18 17 16 15
1F 6.3V
0.47F M5 M6
1000pF 13 14
24k
75k
10 10
10 10 1 2 47pF 10k 0.01F 1nF 100pF 8 9 VDIFFOUT VOS- VIN: 12V VOUT: 1.05V TO 1.825, 70A M1 TO M12: Si7440DP L1 TO L4: 1H SUMIDA CEP125-IROMC-H D7 TO D10: CENTRAL CMDSH-3TR COUT: KEMET T510X477M006AS VOS+ 10 11 12 13 1000pF 14 3 1000pF 4 5 6 7 RUN/SS SENSE1+ SENSE1- EAIN PLLFLTR PLLIN PHASMD ITH SGND VDIFFOUT VOS- VOS+ SENSE2- SENSE2+ LTC1629 NC TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC PGND BG2 BOOST2 SW2 TG2 AMPMD 28 27 26 25 24 23 22 21 20 19 18 17 16 15 L4 10 10 0.47F M10 M11 M12 D4 MBRS 340T3 1 2 3 0.002 4
1706-85 TA03
5V
0.47F 10 1F 1F 6.3V D10 150F, 16V x2 22F 6.3V M7 M8 M9
D9
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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VID Controlled High Current 70A 4-Phase Power Supply
10 10 1 0.33F 2 3 1000pF 4 5 6 7 RUN/SS SENSE1
+
CLKOUT TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC
28 27 26 25 24 23 22 21 D7 22F 6.3V 1F 16V 150F, 16V x2 0.47F 10 M2 M1 5V
L1
3 0.002 4 1 2
SENSE1- EAIN PLLFLTR PLLIN NC ITH LTC1629
M3
D1 MBRS 340T3
+
M4
GND
x3 470F, 6.3V KEMET CAP D2 MBRS 340T3 1 2 3 0.002 4
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VOUT 1.05V TO 1.825V 70A
L2
L3
3 0.002 4 1 2
D3 MBRS 340T3 x3 470F, 6.3V KEMET CAP
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GND
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VIN 12V
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LTC1706-85
PACKAGE DESCRIPTIO U
MS Package 10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 0.127 (.035 .005) 3.00 0.102 (.118 .004) (NOTE 3) 10 9 8 7 6 0.497 0.076 (.0196 .003) REF 0.254 (.010) GAUGE PLANE 12345 0.53 0.01 (.021 .006) DETAIL "A" 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX SEATING PLANE 0.17 - 0.27 (.007 - .011) 0.13 0.05 (.005 .002)
MSOP (MS) 1001
5.23 (.206) MIN
3.2 - 3.45 (.126 - .136)
DETAIL "A" 0 - 6 TYP
4.88 0.10 (.192 .004)
3.00 0.102 (.118 .004) NOTE 4
0.50 3.05 0.38 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT
1.10 (.043) MAX
0.86 (.034) REF
0.50 (.0197) TYP
RELATED PARTS
PART NUMBER LTC1622 LTC1628/LTC1628-PG LTC1629/LTC1629-PG LTC1702/LTC1703 LTC1706-81/LTC1706-82 LTC1709/LTC1709-8 LT1709-85 LTC1735 DESCRIPTION Sychnronizable Low Voltage Step-Down Controller Dual High Efficiency, 2-Phase Sync Step-Down Controller PolyPhase(R) High Efficiency Step-Down DC/DC Controller Dual High Efficiency, 2-Phase Sync Step-Down Controller VID Voltage Programmer with Desktop Code 2-Phase Sync Step-Down Controller with 5-Bit Desktop VID 2-Phase, 5-Bit VID, Current Mode High Efficiency Synchronous Step-Down Switching Regulator High Efficiency Sync Step-Down Controller COMMENTS 8-Pin MSOP, 2V VIN 10V, 550kHz, Burst Mode(R) Operation Constant Freq, Standby, 5V and 3.3V LDOs, 3.5V VIN 36V Expandable Up to 12 Phases, Up to 200A, Remote Sense Diff Amp 550kHz, 25MHz GBW, No RSENSETM, 2.7V VIN 7V VRM 8.2-VRM 8.4, VOUT Range: 1.3V to 3.5V 4V VIN 36V, PLL, 36-Pin SSOP, Current Mode Operation 4V VIN 36V, 36-Pin SSOP VRM 8.5 Compatiable
Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection, 3.5V VIN 36V LTC1736 High Efficiency Sync Buck Controller with 5-Bit Mobile VID GN-24, Power Good, Output Fault Protection, 3.5V VIN 36V LTC1772 SOT-23 Low Voltage Step-Down Controller 6-Pin SOT-23, 2.5V VIN 10V, 550kHz, Burst Mode Operation LTC1773 Synchronous Step-Down DC/DC Controller Up to 95% Efficiency, 550kHz Operation, 2.65V VIN 8.5V, 0.8 VOUT VIN LTC1778 Wide Operating Range Step-Down Controller No RSENSE, VIN up to 36V, Current Mode Power Good LTC1929/LTC1929-PG 2-Phase Sync Step-Down Controller Current Mode Operation, IOUT Up to 40A, 3.5V VIN 36V LTC3728 550kHz, 2-Phase Dual Output Synchronous Synchronizable, Current Mode, 3.5V VIN 36V, Step-Down Controller IOUT up to 25A LTC3729 550kHz, PolyPhase, High Efficiency Synchronous Current Mode, 4V VIN 36V, 28-Lead SSOP package Step-Down Switching Regulator Burst Mode and PolyPhase are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation.
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
LT/TP 1202 2K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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