LTC1706-85 VID Voltage Programmer for Intel VRM 8.5 U FEATURES ■ ■ ■ ■ ■ ■ DESCRIPTIO 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 U APPLICATIO S ■ ■ ■ The LTC®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. Server/Desktop Computers Multiprocessor Workstations and Servers Multiphase Processor Power Supply 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. U TYPICAL APPLICATIO VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram) VIN 4.5V TO 22V VOS+ VOS– INTVCC VID25 FROM µP LTC1629 SENSE VID1 LTC1706-85 VID2 RSENSE1 SW1 VCC VID0 VIN TG1 VDIFFOUT + BG1 VOUT 1.05V TO 1.825V UP TO 80A COUT VIN PGND SGND FB VID3 GND TG2 EAIN RSENSE2 SW2 ITH CLKOUT BG2 VIN 4.5V TO 22V PLLIN VIN LTC1929 TG1 RSENSE3 SW1 BG1 PGND VIN SGND EAIN ITH NOTE: UP TO SIX LTC1629s/LTC1929s CAN BE PARALLELED TO DELIVER AS MUCH AS 200A TG2 RSENSE4 SW2 BG2 1706-85 TA01 170685f 1 LTC1706-85 U W W W ABSOLUTE AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO (Notes 1, 2) 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) .. – 40°C to 85°C Junction Temperature ........................................... 110°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ORDER PART NUMBER TOP VIEW VID25 VID0 VID1 VID2 VCC 1 2 3 4 5 10 9 8 7 6 FB GND NC VID3 SENSE LTC1706EMS-85 MS PART MARKING MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 110°C, θJA = 200°C/W LTYQ Consult LTC Marketing for parts specified with wider operating temperature ranges. 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, VID25 = VID0 = VID1 = VID2 = VID3 = NC unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN VCC Operating Supply Voltage Range IVCC Supply Current RFB1 Resistance Between SENSE and FB VOUT(ERROR) Output Voltage Accuracy 1.050 ≤ VSENSE ≤ 1.825V RPULLUP Pull-Up Resistance on VID VDIODE = 0.6V (Note 5) 28 VIH Minimum High Level Input Voltage (VID Inputs) VCC = 3.3V 2 VIL Maximum Low Level Input Voltage (VID Inputs) VCC = 3.3V IIN Input Leakage Current (VID Inputs) VCC < VID < 7V (Note 5) TYP 2.7 (Note 4) 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 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. 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 ● 6 ● – 0.25 MAX UNITS 5.5 V 1 10 µA 10 14 kΩ 0.25 % 56 kΩ 40 V 0.01 0.8 V ±1 µA 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.) 170685f 2 LTC1706-85 U W TYPICAL PERFOR A CE CHARACTERISTICS Typical Error % vs Temperature Typical Error % vs Output Voltage 0.25 0.25 TA = 25°C ERROR (%) ERROR (%) VOUT = 1.05V 0 –0.25 1.0 1.2 1.6 1.4 OUTPUT VOLTAGE (V) 0 –0.25 –50 1.8 VOUT = 1.325V VOUT = 1.825V 0 50 TEMPERATURE (°C) 1706-85 G01 100 1706-85 G02 VID Pullup Current vs Temperature RFB1 vs Temperature 10.10 70 VID PULL-UP CURRENT (µA) VCC = 3.3V VID PIN UNDER TEST = 0V RFB1 (kΩ) 10.05 10.00 9.95 9.90 –50 0 50 TEMPERATURE (°C) 65 60 55 –50 100 0 50 TEMPERATURE (°C) 1706-85 G03 1706-85 G04 Supply Current vs Temperature Supply Current vs Supply Voltage 1.0 1.0 ALL VID INPUTS OPEN TA = 25°C VCC = 5V 0.5 VCC = 3.3V SUPPLY CURRENT (µA) ALL VID INPUTS OPEN SUPPLY CURRENT (µA) 100 0.5 VCC = 2.7V 0 –50 0 50 TEMPERATURE (°C) 100 1706-85 G05 0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 6.0 1706-85 G06 170685f 3 LTC1706-85 U U U 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 µP. SENSE (Pin 6): Regulator Output Voltage. Connect directly to regulator output sense node or VDIFFOUT when used with the LTC1929 or LTC1629. VID0 (Pin 2): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of µP. VID3 (Pin 7): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of µP. VID1 (Pin 3): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of µP. NC (PIN 8): No Connect. VID2 (Pin 4): Programming Input. GND = LOW, VCC or Float = HIGH. Refer to Table 1 for programming information. Connect to associated VID pin of µP. 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. VCC (Pin 5): Power Supply Voltage. May range from 2.7V to 5.5V. W BLOCK DIAGRA VCC 40k VID25 1 VCC VCC 5 6 40k SENSE RFB1 10k VID0 2 VCC 10 FB SWITCH CONTROL LOGIC RFB2 9 40k GND VID1 3 1706-85 BD VCC VCC 40k VID2 4 40k VID3 7 170685f 4 LTC1706-85 U 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. 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 Voltage Sensing and Feedback Pins 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 68µA. 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. 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. 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. 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. 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 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. 170685f 5 LTC1706-85 U OPERATIO Table 1. VID Inputs and Corresponding Output Voltage CODE VID3 VID2 VID1 VID0 VID25 VOLTAGE CODE VID3 VID2 VID1 VID0 VID25 VOLTAGE 00000 GND GND GND GND GND 1.250 10000 Float GND GND GND GND 1.650 00001 GND GND GND GND Float 1.275 10001 Float GND GND GND Float 1.675 00010 GND GND GND Float GND 1.200 10010 Float GND GND Float GND 1.600 00011 GND GND GND Float Float 1.225 10011 Float GND GND Float Float 1.625 00100 GND GND Float GND GND 1.150 10100 Float GND Float GND GND 1.550 00101 GND GND Float GND Float 1.175 10101 Float GND Float GND Float 1.575 00110 GND GND Float Float GND 1.100 10110 Float GND Float Float GND 1.500 00111 GND GND Float Float Float 1.125 10111 Float GND Float Float Float 1.525 01000 GND Float GND GND GND 1.050 11000 Float Float GND GND GND 1.450 01001 GND Float GND GND Float 1.075 11001 Float Float GND GND Float 1.475 01010 GND Float GND Float GND 1.800 11010 Float Float GND Float GND 1.400 01011 GND Float GND Float Float 1.825 11011 Float Float GND Float Float 1.425 01100 GND Float Float GND GND 1.750 11100 Float Float Float GND GND 1.350 01101 GND Float Float GND Float 1.775 11101 Float Float Float GND Float 1.375 01110 GND Float Float Float GND 1.700 11110 Float Float Float Float GND 1.300 01111 GND Float Float Float Float 1.725 11111 Float Float Float Float Float 1.325 U TYPICAL APPLICATIO S 30A, 2-Phase VID Controlled Power Supply VIN 12V OPTIONAL SYNC CLOCK IN 10Ω 10Ω 0.33µF 1 TG1 3 SENSE1– SW1 2 FROM µP 3 4 7 5 VCC SENSE VID0 VID1 6 0.33µF VID25 7 6 3300pF 100pF 100pF 10k LTC1706-85 8 9 10 VID2 FB 10 VID3 GND BOOST1 PLLFLTR PLLIN NC ITH VIN BG1 EXTVCC LTC1929 SGND INTVCC PGND VDIFFOUT BG2 VOS– BOOST2 12 VOS+ SW2 14 VIN: 12V VOUT: 1.05V TO 1.825, 30A M1 TO M6: FDS7760A L1 TO L2: 1µH SUMIDA CEP125-IROMC-H D7 TO D10: CENTRAL CMDSH-3TR COUT: PANASONIC EEFUEOG181R EAIN 11 1000pF 13 9 NC SENSE1+ 1000pF 4 5 RUN/SS 2 SENSE2– SENSE2 + TG2 AMPMD L1 28 27 75k 4 1 0.003Ω 2 26 25 0.47µF D1 MBRS 340T3 M1 10Ω 24 M2 M3 23 22µF 6.3V 22 21 D7 20 D8 19 1µF 6.3V 18 17 16 1µF 150µF, 16V 16V ×2 + + ×5 180µF 4V GND M5 M6 15 VOUT 1.05V TO 1.825V 30A D2 MBRS 340T3 M4 0.47µF 1 3 L2 24k 3 5V + 1 0.003Ω 2 4 10Ω 10Ω 170685f 6 LTC1706-85 U TYPICAL APPLICATIO S VID Controlled High Current 70A 4-Phase Power Supply OPTIONAL SYNC CLOCK IN 10Ω 10Ω 2 0.33µF 3 1000pF 4 5 2 FROM µP 3 4 7 VCC SENSE VID0 VID1 6 0.33µF VID25 7 6 3300pF 100pF 10k LTC1706-85 8 100pF 9 10 VID2 FB 10 VID3 GND + SENSE1– EAIN BOOST1 PLLFLTR PLLIN TG1 SW1 VIN LTC1629 BG1 NC EXTVCC ITH INTVCC SGND PGND VDIFFOUT BG2 VOS– 11 VOS+ VOS– 12 VOS+ SW2 SENSE2– TG2 SENSE2+ AMPMD 1000pF 13 9 SENSE1 CLKOUT 14 BOOST2 L1 28 3 0.002Ω 4 1 2 5V 27 26 0.47µF 25 M1 10Ω 24 M2 M3 22 1µF 16V 22µF 6.3V 21 D7 20 D8 1µF 6.3V 19 150µF, 16V ×2 + 18 + ×3 470µF, 6.3V KEMET CAP GND M4 0.47µF 17 M5 16 M6 15 VOUT 1.05V TO 1.825V 70A D2 MBRS 340T3 1 2 3 0.002Ω 4 L2 24k D1 MBRS 340T3 23 10Ω 10Ω 75k 10Ω 10Ω 1 2 3 47pF 1000pF 4 10k 5 0.01µF 6 1nF 7 8 100pF 9 VIN: 12V VOUT: 1.05V TO 1.825, 70A M1 TO M12: Si7440DP L1 TO L4: 1µH SUMIDA CEP125-IROMC-H D7 TO D10: CENTRAL CMDSH-3TR COUT: KEMET T510X477M006AS VDIFFOUT 10 VOS– 11 VOS+ 12 13 1000pF 14 NC RUN/SS SENSE1+ TG1 SENSE1– SW1 BOOST1 EAIN VIN PLLFLTR BG1 PLLIN EXTVCC PHASMD ITH SGND VDIFFOUT LTC1629 INTVCC PGND BG2 VOS– BOOST2 VOS+ SW2 SENSE2– TG2 SENSE2+ AMPMD L3 28 26 0.47µF 25 10Ω 24 22 20 1µF 6.3V D9 D10 M9 M8 1µF 23 21 M7 22µF 6.3V + D3 MBRS 340T3 ×3 470µF, 6.3V KEMET CAP 150µF, 16V ×2 + GND VIN 12V 19 18 17 0.47µF M10 M12 M11 16 15 L4 10Ω 3 0.002Ω 4 1 2 5V 27 + 1 5 RUN/SS + 1 10Ω D4 MBRS 340T3 1 2 3 0.002Ω 4 1706-85 TA03 170685f 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. 7 LTC1706-85 U PACKAGE DESCRIPTIO MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 10 9 8 7 6 3.2 – 3.45 (.126 – .136) 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) NOTE 4 4.88 ± 0.10 (.192 ± .004) DETAIL “A” 0.497 ± 0.076 (.0196 ± .003) REF 0° – 6° TYP GAUGE PLANE 0.50 3.05 ± 0.38 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 1 2 3 4 5 0.53 ± 0.01 (.021 ± .006) DETAIL “A” 0.86 (.034) REF 1.10 (.043) MAX 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) 0.50 (.0197) TYP 0.13 ± 0.05 (.005 ± .002) MSOP (MS) 1001 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® 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® 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. 170685f 8 Linear Technology Corporation LT/TP 1202 2K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2001