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LTC1706-63 5-Bit VID Voltage Programmer for Sun CPUs
FEATURES

DESCRIPTIO
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
The LTC(R)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.
APPLICATIO S

SunTM Processor Power Supply Workstations and Servers Large Memory Array Supply
TYPICAL APPLICATIO
5-Bit VID-Controlled High Current Application (Simplified Block Diagram)
VIN 4.5V TO 22V VIN LTC1629-6 VID0 VID1 FROM P VCC SENSE TG1 SW1 INTVCC VDIFFOUT SGND FB GND EAIN ITH TG2 SW2 BG2 VIN 4.5V TO 22V VIN LTC1629-6 TG1 SW1 BG1 PGND SGND EAIN ITH TG2 SW2 BG2
1706-63 TA01
L1
BG1 PGND VIN
VID2 LTC1706-63 VID3 VID4
L2
L3
VIN
L4
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RSENSE1
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VOUT 1.025V TO 1.4125V UP TO 80A COUT
RSENSE2
RSENSE3
RSENSE4
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LTC1706-63
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW VID0 VID1 VID2 VID3 VCC 1 2 3 4 5 10 9 8 7 6 FB GND NC VID4 SENSE
(Voltages Referred to GND Pin) 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 Ambient Temperature Range (Note 2) .................................................. - 40C to 85C Junction Temperature ........................................... 110C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 110C, JA = 120C/ W
ORDER PART NUMBER LTC1706EMS-63
MS PART MARKING LTBXM
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C. 2.7V VCC 5.5V, VID0 = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified.
SYMBOL VCC IVCC RFB-SENSE VOUT Error % RPULLUP VIDTH IVID-LEAK VPULLUP PARAMETER Operating Supply Voltage Range Supply Current Resistance Between SENSE and FB Output Voltage Accuracy VID Input Pull-Up Resistance VID Input Voltage Threshold VID Input Leakage Current VID Pull-Up Voltage CONDITIONS (Note 3)

MIN 2.7 3 - 0.35
TYP 0.1 5 40
MAX 5.5 5 7 + 0.35 0.4
VDIODE = 0.6V (Note 4) VIL (2.7V VCC 5.5V) VIH (2.7V VCC 5.5V) VCC < VID < 7V (Note 4) VCC = 3.3V VCC = 5V
1.6 0.01 2.8 4.5 1
UNITS V A k % k V V A V V
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1706EMS-63 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 3: With all five VID inputs floating, the VCC supply current is simply the device leakage current. However, the VCC supply current will rise and be approximately equal to the number of grounded VID input pins times (VCC - 0.6V)/40k. (See the VID Input Characteristics section for more details.) Note 4: 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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LTC1706-63 TYPICAL PERFORMANCE CHARACTERISTICS
IVID-PULLUP vs Temperature
140 120 100 80 60 40 20 -50 0 -50
0
VID PULL-UP CURRENT (A)
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
VCC = 5V VID4 = 0V VID0 = VID1 = VID2 = VID3 = OPEN
0 50 TEMPERATURE (C)
VID VID Sense Accuracy
0.35 0.25
0.35 0.25
VIDACCURACY ( %)
VIDACCURACY ( %)
0.15 0.05 -0.05 -0.15 -0.25 -0.35 0.775 VCC = 5.5V VCC = 2.7V
0.05 -0.05 -0.15 -0.25 -0.35 -60 -40 -20 VSENSE = 1.025V VSENSE = 1.4125V
RFB1 (k)
0.975
1.175
1.375
SENSE VOLTAGE (V)
1706-63 G04
PIN FUNCTIONS
VID0 (Pin 1): LSB Programming Input. Low = GND, High = VCC or Float. Grounding VID0 adds 12.5mV to the output sense voltage. VID1 (Pin 2): 4th MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID1 adds 25mV to the output sense voltage. VID2 (Pin 3): 3rd MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID2 adds 50mV to the output sense voltage. VID3 (Pin 4): 2nd MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID3 adds 100mV to the output sense voltage. VCC (Pin 5): Power Supply Voltage. Range from 2.7V to 5.5V. SENSE (Pin 6): Regulator Output Voltage. Connect directly to regulator output sense node. VID4 (Pin 7): MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID4 adds 200mV to the output sense voltage. NC (Pin 8): No Connect. GND (Pin 9): Ground. Connect to regulator signal ground. FB (Pin 10): Feedback Input. Connect to the 0.6V feedback pin of a compatible regulator.
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Supply Current vs Temperature
2.0 ALL VID INPUTS OPEN 1.5
1.0
Supply Current vs Supply Voltage
ALL VID INPUTS OPEN TA = 25C
1.0 VCC = 5V 0.5 VCC = 3.3V
0.5
VCC = 2.7V
100
1706-63 G01
0 50 TEMPERATURE (C)
100
1706-63 G02
2.5
3.0
3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
5.5
6.0
1706-63 G03
VID Sense Accuracy vs Temperature
VCC = 5.5V 5.500
RFB1 vs Temperature
0.15 VSENSE = 1.225V
5.250
5.000
4.975
1.575
0
20
40
60
80
100
4.950 -50
TEMPERATURE (C)
1706-63 G05
0 50 TEMPERATURE (C)
100
1706-63 G06
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LTC1706-63
PIN FUNCTIONS
PIN 1 2 3 4 5 6 7 8 9 10 NAME VID0 VID1 VID2 VID3 VCC SENSE VID4 NC GND FB Ground 0.6V Feedback Input 0 0 0.6 1.5 - 0.3 - 0.3 7 7 DESCRIPTION LSB Programmable Input 4th MSB Programmable Input 3rd MSB Programmable Input 2nd MSB Programmable Input Power Supply Regulator Output Voltage 1st MSB Programmable Input MIN 0 0 0 0 2.7 0.8 0 NOMINAL (V) TYP MAX VCC VCC VCC VCC 5.5 1.55 VCC ABSOLUTE MAX (V) MIN MAX - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 7 7 7 7 7 7 7
BLOCK DIAGRA
VID0 1 VCC VCC 5
VID1 2 VCC SWITCH CONTROL LOGIC 40k VID2 3
VID3 4
OPERATIO
The LTC1706-63 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 LTC1706-63 produces an output voltage ranging from 1.025V to 1.4125V in 12.5mV steps by closing the loop between the output voltage sense and the feedback input of the regulator with the appropriate resistive divider network.
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VCC
40k
40k RFB1
6
SENSE
10 FB RFB2 9 GND
1706-63 BD
VCC
VCC
40k VID4 7
40k
The "top" feedback resistor, RFB1, connected between SENSE and FB, is typically 5k and is not modified by the state of the VID program inputs. The "bottom" feedback resistor, RFB2, however, is modified by the five VID inputs and is precisely ratioed to RFB1.
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LTC1706-63
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 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 1.4125V 1.4000V 1.3875V 1.3750V 1.3625V 1.3500V 1.3375V 1.3250V 1.3125V 1.3000V 1.2875V 1.2750V 1.2625V 1.2500V 1.2375V 1.2250V 1.2125V 1.2000V 1.1875V 1.1750V 1.1625V 1.1500V 1.1375V 1.1250V 1.1125V 1.1000V 1.0875V 1.0750V 1.0625V 1.0500V 1.0375V 1.0250V
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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 minimum 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, respectively, 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 40k.
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LTC1706-63
OPERATIO
In other words, each VID input has a typical pull-up current of 68A for a 3.3V system. Besides the LTC1629-6, the LTC1706-63 also programs a whole family of LTC DC/DC converters that have an on-board 0.6V reference. The LTC3714, LTC3778 and
TYPICAL APPLICATIO
2-Phase 12V Input, 1.025V to 1.4125V/45A Max Power Supply (LTC3819) with Adjustable Overvoltage Protection (LTC1706-63)
VDD_CORE+ VCC
COMPARATOR
PWRGD ENABLE D1 BAT54 C1 0.1F RUN/SS C3 1nF LTC3819 1 2 3 4 5 R23 48.7k CLK1 C9 4.7nF R6 2.2k C10 220pF R24 107k INTVCC C14 470pF 6 7 8 9 10 11 12 13 14 Q9 (OPT) 2N7002 VID0 VID1 VID2 VID3 VID4 C17 1nF 15 16 17 18 RUN/SS SENSE1+ SENSE1- EAIN PLLFLTR PLLIN FCB ITH SGND VDIFFOUT VOS
-
PGOOD TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC PGND BG2 BOOST2 SW2 TG2 ATTENIN VBIAS VID4 VID3 VID2
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 C18 0.1F R12 10 INTVCC C11 2.2F D3 BAT54A C12 10F C15 0.47F C7 1F
VOS+ SENSE2 - SENSE2 + ATTENOUT NO_CPU VID0 VID1
CIN1: SIX 10F 16V CERAMIC CAPACITORS COUT1: TEN 22F 6.3V CERAMIC CAPACITORS L1, L2: SUMIDA CEP125-1R0MC-H Q1, Q3: TWO Si7448DP IN PARALLEL Q2, Q4: THREE Si7448DP IN PARALLEL
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OVP TO SYSTEM OVERVOLTAGE PROTECTION
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LTC3731 are just a few of the high efficiency step-down switching regulators that will work equally well with the LTC1706-63. The LTC3819 is a VID controlled 2-phase synchronous step-down controller with on-board LTC1706-63.
LTC1706-63 SENSE FB OVP THRESHOLD LOGIC VID0 VID1 VID2 VID3 VID4 FROM P R1 10 Q1 x2 C5 0.47F Q2 x3 C2 0.47F 10 L1 0.8H D2 B320A 12VIN CIN1 10 R5 0.002 C8 0.47F VDD_CORE+ COUT1 R7 0.002 R8 50 C16 0.47F GND R9 50 COREFB_H GND
+
Q3 x2
C13 0.47F L2 0.8H D4 B320A
+
Q4 x3
10
10
COREFB_L
1706-63 TA03
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LTC1706-63
TYPICAL APPLICATIO
1F X5R
100k 3 4 1500pF 20k 5 6 7 0.01F 8 330k 9 10 5V
22pF
FROM P
PACKAGE DESCRIPTION
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
5.23 (.206) MIN
3.2 - 3.45 (.126 - .136)
0.254 (.010) DETAIL "A" 0 - 6 TYP
0.50 0.305 0.038 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT
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
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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1.025V to 1.4125V VID Programmable 15A Power Supply
VIN 12V CMDSH-3 1 2 RUN/SS VON BOOST TG SW SENSE + SENSE - PGND BG DRVCC INTVCC VIN 20 19 18 17 16 B320A 15 IRF7811 14 13 4.7F X5R 6.3V 12 11 1 VIN 0.1F 5 1 2 3 4 7 6 VID0 SENSE VID1 VID2 LTC1706-63 VID3 FB VID4 GND 10 9 VCC 0.22F LTC3778 10F 16V X5R x4 IRF7811 PGOOD VRNG ITH FCB SGND ION VFB EXTVCC 0.68H SP 270F 2V x3 VOUT 1.025V TO 1.4125V 15A 22F 6.3V X5R
1706-63 TA02
4.90 0.15 (1.93 .006)
3.00 0.102 (.118 .004) NOTE 4
GAUGE PLANE 12345 0.53 0.01 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE 0.17 - 0.27 (.007 - .011) TYP 0.13 0.076 (.005 .003)
MSOP (MS) 0802
1.10 (.043) MAX
0.86 (.034) REF
0.50 (.0197) BSC
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LTC1706-63
TYPICAL APPLICATION
VID Controlled High Current 70A 4-Phase Application
OPTIONAL SYNC CLOCK IN 1 0.33F 2 3 1000pF 4 5 1 2 FROM P 3 4 7 VCC VID0 VID1 VID2 VID3 VID4 GND 9 FB 100pF 10 SENSE LTC1706-63 6 47k 6800pF 0.33F 5 6 7 8 9 10 11 12 1000pF 13 14 RUN/SS SENSE1
+
100pF VDIFFOUT VOS- VOS+
D8
0.47F M5 M6
24k
75k
1 2 1000pF 47pF 10k 0.01F 3 4 5 6 7
RUN/SS SENSE1+ SENSE1 EAIN PLLFLTR PLLIN
-
CLKOUT TG1 SW1 BOOST1 VIN BG1
28 27 26 25 24 23 1F 1F 25V 150F, 16V x2 22F 6.3V 0.47F 10 M7 M8 5V
47pF
D10
VDIFFOUT VOS- VOS+ M1 TO M12: FDS7760A L1 TO L4: 1H SUMIDA CEPH149-IROMC D7 TO D10: CENTROI CMDSH-3TR COUT: KEMET T510X477M006AS fSW: 200kHz 1000pF
0.47F
RELATED PARTS
PART NUMBER LTC1629-6 LTC3714 LTC3716 LTC3731 LTC3733 LTC3778 LTC3819 DESCRIPTION PolyPhase Synchronous Step-Down Controller Single Phase Synchronous Step-Down Controller with VID 2-Phase Synchronous Step-Down Controller with VID 3-Phase, 60A Synchronous Step-Down Controller 3-Phase, 60A Synchronous Step-Down Controller for AMD Opteron Processors Optional RSENSE DC/DC Synchronous Controller 2-Phase Synchronous Step-Down Controller
(R)
COMMENTS Up to 12-Phase Operation, Up to 200A Power Supply 0.6V VOUT 1.75V, IOUT 25A 0.6V VOUT 1.75V, IOUT 40A Single IC 60A Solution with Onboard MOSFET Drivers, 5% Output Current Matching for Optimum Thermal Performance and Reliability On-Board VID and MOSFET Drivers, 0.8V VOUT 1.55V, IOUT 60A Current Mode Operation with RSENSE or MOSFET RDC(0N) Sensing, 4.5V VIN 36V 1.025V VOUT 1.4125V; 40A
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PolyPhase is a registered trademark of Linear Technology Corporation.
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
www.linear.com
+
22 EXTVCC PHASMD 8 LTC1629-6 21 INTVCC ITH 9 20 PGND SGND 10 19 BG2 VDIFFOUT 11 18 BOOST2 VOS- 12 17 + SW2 VOS 13 16 - TG2 SENSE2 14 15 AMPMD SENSE2+
D9
+
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CLKOUT TG1 SW1 BOOST1 VIN BG1
28 27 26 25 24 23 D7 1F 1F 25V 150F, 16V x2 0.47F 10 M2 M1 5V
L1 0.003
SENSE1- EAIN PLLFLTR PLLIN PHASMD
M3
D1 MBRS 340T3
22 EXTVCC 21 ITH LTC1629-6 INTVCC 20 SGND PGND 19 VDIFFOUT BG2 18 VOS- BOOST2 17 + VOS SW2 16 - SENSE2 TG2 15 SENSE2+ AMPMD
22F 6.3V
+
COUT 470F, 6.3V x3 D2 MBRS 340T3 0.003 L2
+
M4
GND
VOUT 1.025V TO 1.4125V 70A
L3 0.003 D3 MBRS 340T3 COUT 470F, 6.3V x3
M9
+
GND
+
VIN 12V
M10 M11 M12
D4 MBRS 340T3 0.003
L4
1706-63 TA04
LT 1005 * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 2005

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