LTC1706-82 VID Voltage Programmer for Intel VRM9.0/9.1 U 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 VRM9.0/9.1 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 entire family of Linear Technology DC/DC converters in full compliance with the Intel VRM9.0/9.1 specifications. The LTC1706-82 programs the following Linear Technology DC/DC converters: LTC1628, LTC1629, LTC1702, LTC1735, LTC1735-1, LTC1929 and LTC3729. U APPLICATIO S ■ ■ ■ Intel Pentium® III Processor Power Supply Multiprocessor Workstations and Servers Multiphase Processor Power Supply AMD AthlonTM Processor Power Supply For a compact VRM9.0/9.1 solution with up to 60A capability, see the LTC3732, a 3-phase synchronous controller with integrated 5-bit VID and MOSFET drivers. , 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. U ■ TYPICAL APPLICATIO VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram) VIN 4.5V TO 22V VIN TG1 INTVCC VID0 VCC VID1 FROM µP LTC1629 SENSE VID2 LTC1706-82 VID3 VID4 L1 RSENSE1 SW1 VDIFFOUT + BG1 VOUT 1.10V TO 1.85V UP TO 70A COUT VIN PGND SGND FB TG2 EAIN L2 RSENSE2 L3 RSENSE3 L4 RSENSE4 SW2 GND BG2 VIN 4.5V TO 22V VIN LTC1629 TG1 SW1 BG1 PGND VIN SGND EAIN TG2 SW2 NOTE: UP TO SIX LTC1629s CAN BE PARALLELED TO DELIVER AS MUCH AS 200A BG2 1706-82 TA01 170682fa 1 LTC1706-82 U W W W ABSOLUTE AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO (Note 1) (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 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 ORDER PART NUMBER TOP VIEW 1 2 3 4 5 VID0 VID1 VID2 VID3 VCC 10 9 8 7 6 FB GND NC VID4 SENSE LTC1706EMS-82 MS PACKAGE 10-LEAD PLASTIC MSOP MS PART MARKING TJMAX = 110°C, θJA = 200°C/W LTMJ 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, VID0 = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified. SYMBOL PARAMETER VCC Operating Supply Voltage Range IVCC Supply Current CONDITIONS MIN TYP 2.7 (Note 3) 0.1 RFB-SENSE Resistance Between SENSE and FB VOUT Error % Output Voltage Accuracy Programmed From 1.10V to 1.85V RPULLUP VID Input Pull-Up Resistance VDIODE = 0.6V, (Note 4) VIDT VID Input Voltage Threshold VIL (2.7V < VCC < 5.5V) VIH (2.7V < VCC < 5.5V) ● 6 ● – 0.25 10 UNITS 5.5 V 5.0 µA 14 kΩ 0.25 % 40 kΩ 0.4 V V ±1.00 µA 1.6 IVID-LEAK VID Input Leakage Current VCC < VID < 7V, (Note 4) 0.01 VPULLUP VID Pull-Up Voltage VCC = 3.3V VCC = 5V 2.8 4.5 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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. MAX V V 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 Applications Information section for more detail.) 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.) 170682fa 2 LTC1706-82 U W TYPICAL PERFOR A CE CHARACTERISTICS Typical Error % vs Output Voltage Typical Error % vs Temperature 0.25 0.25 TA = 25°C ERROR (%) ERROR (%) VOUT = 1.1V 0 –0.25 1.1 1.2 1.3 1.4 1.5 1.6 1.7 OUTPUT VOLTAGE (V) 1.8 VOUT = 1.5V VOUT = 1.85V 0 –0.25 –50 0 50 TEMPERATURE (°C) 1706-82 G01 100 1706-82 G02 RFB1 vs Temperature IVID-PULLUP vs Temperature 150 VID PULL-UP CURRENT (µA) 30 RFB1 (kΩ) 20 10 VCC = 5V VID4 = 0V VID0 = VID1 = VID2 = VID3 = OPEN 130 110 90 70 50 0 –50 0 50 TEMPERATURE (°C) 30 –50 100 0 50 TEMPERATURE (°C) 1706-82 G04 1706-82 G03 Supply Current vs Temperature Supply Current vs Supply Voltage 5 ALL VID INPUTS OPEN ALL VID INPUTS OPEN TA = 25°C 4 1.5 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 2.0 100 1.0 VCC = 5V VCC = 3.3V 0.5 VCC = 2.7V 3 2 1 0 –50 0 50 TEMPERATURE (°C) 100 1706-82 G05 0 0 2 4 6 SUPPLY VOLTAGE (V) 8 1706-82 G06 170682fa 3 LTC1706-82 U U U 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 directly 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. VID3 (Pin 4): 2nd MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID3 adds 200mV to the output sense voltage. 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 LTC1629, LTC1929 and LTC3729. VCC (Pin 5): Power Supply Voltage. Range from 2.7V to 5.5V. U PI TABLE MIN NOMINAL (V) TYP MAX ABSOLUTE MAX (V) MIN MAX PIN NAME DESCRIPTION 1 VID0 LSB Programmable Input 0 VCC – 0.3 7 2 VID1 4th MSB Programmable Input 0 VCC – 0.3 7 3 VID2 3rd MSB Programmable Input 0 VCC – 0.3 7 4 VID3 2nd MSB Programmable Input 0 VCC – 0.3 7 5 VCC Power Supply 2.7 5.5 – 0.3 7 6 SENSE Regulator Output Voltage 1.075 1.85 – 0.3 7 7 VID4 MSB Programmable Input 0 VCC – 0.3 7 8 NC 9 GND Ground – 0.3 7 10 FB 0.8V Feedback Input – 0.3 7 0 0 0.8 1.075 170682fa 4 LTC1706-82 W BLOCK DIAGRA VCC 40k VID0 1 VCC VCC 5 6 40k SENSE RFB1 10k VID1 2 VCC 10 FB SWITCH CONTROL LOGIC RFB2 9 40k GND VID2 3 1706-82 BD VCC VCC 40k VID3 4 40k VID4 7 U OPERATIO The LTC1706-82 is a precision 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 LTC1706-82 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. 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 modified by the five VID inputs and is precisely ratioed to RFB1. 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. 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. 170682fa 5 LTC1706-82 U OPERATIO 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 high input. The series diode is included to prevent the input from being damaged or clamped when it is driven higher than VCC. Table 1. VID Inputs and Corresponding Output Voltage CODE VID4 VID3 VID2 VID1 VID0 OUTPUT 00000 GND GND GND GND GND 1.850 00001 GND GND GND GND Float 1.825 00010 GND GND GND Float GND 1.800 00011 GND GND GND Float Float 1.775V 00100 GND GND Float GND GND 1.750V 00101 GND GND Float GND Float 1.725V The FB pin is a high impedance node that requires minimum layout distance to reduce extra loading and unwanted stray pickup. 00110 GND GND Float Float GND 1.700V 00111 GND GND Float Float Float 1.675V 01000 GND Float GND GND GND 1.650V When used with the LTC1629, the LTC1706-82’s FB, SENSE, VCC and GND pins should be connected, respectively, 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. 01001 GND Float GND GND Float 1.625V 01010 GND Float GND Float GND 1.600V Voltage Sensing and Feedback Pins 01011 GND Float GND Float Float 1.575V 01100 GND Float Float GND GND 1.550V 01101 GND Float Float GND Float 1.525V 01110 GND Float Float Float GND 1.500V 01111 GND Float Float Float Float 1.475V 10000 Float GND GND GND GND 1.450V 10001 Float GND GND GND Float 1.425V 10010 Float GND GND Float GND 1.400V 10011 Float GND GND Float Float 1.375V 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. 10100 Float GND Float GND GND 1.350V 10101 Float GND Float GND Float 1.325V 10110 Float GND Float Float GND 1.300V 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). VID Input Characteristics 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 VID inputs. This increase in quiescent current is calculated from 10111 Float GND Float Float Float 1.275V 11000 Float Float GND GND GND 1.250V 11001 Float Float GND GND Float 1.225V 11010 Float Float GND Float GND 1.200V 11011 Float Float GND Float Float 1.175V 11100 Float Float Float GND GND 1.150V 11101 Float Float Float GND Float 1.125V 11110 Float Float Float Float GND 1.100V 11111 Float Float Float Float Float NO_CPU (1.075V) IQ = N(VCC – VDIODE)/RPULLUP N is the number of grounded VID inputs. VDIODE is typically 0.6V while RPULLUP has a typical pullup resistance of 40k. In other words, each VID input has a typical pull up current of (VCC – 0.6)/40K, which is approximately 68µA for a 3.3V system. 170682fa 6 LTC1706-82 U U W U APPLICATIO S I FOR ATIO Besides the LTC1629, the LTC1706-82 also programs a whole family of LTC DC/DC converters that have an onboard 0.8V reference. The LTC1628, LTC1735, LTC1702, LTC1772, LTC1929 and LTC3729 are just a few of the high efficiency step-down switching regulators that will work equally well with the LTC1706-82. U PACKAGE DESCRIPTIO MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.2 – 3.45 (.126 – .136) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 0.497 ± 0.076 (.0196 ± .003) REF 10 9 8 7 6 3.00 ± 0.102 (.118 ± .004) NOTE 4 4.90 ± 0.15 (1.93 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 1 2 3 4 5 0.53 ± 0.01 (.021 ± .006) DETAIL “A” 0.86 (.034) REF 1.10 (.043) MAX 0.18 (.007) SEATING PLANE 0.17 – 0.27 (.007 – .011) TYP 0.50 (.0197) BSC 0.13 ± 0.076 (.005 ± .003) MSOP (MS) 0802 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 170682fa 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 LTC1706-82 U TYPICAL APPLICATIO VID Controlled High Current 70A 4-Phase Power Supply OPTIONAL SYNC CLOCK IN 2 0.33µF 3 1000pF 4 5 1 2 FROM µP 3 4 7 5 VCC 6 VID0 SENSE VID1 VID2 6 FB 7 100pF 8 SENSE1 EAIN ITH VOS– 12 + 1000pF 13 14 EXTVCC LTC1629 11 9 BG1 PHASMD VOS– GND VIN PLLIN 9 VID4 SW1 BOOST1 PLLFLTR 10 VOS+ TG1 SENSE1– VDIFFOUT 10 CLKOUT + 6800pF 47k LTC1706-82 VID3 0.33µF RUN/SS INTVCC SGND PGND VDIFFOUT BG2 BOOST2 VOS SW2 SENSE2– TG2 SENSE2+ AMPMD L1 28 27 5V 0.003Ω 26 0.47µF 25 M1 10Ω 24 M2 1µF 23 22 21 D7 20 D8 1µF 25V + 1 22µF 6.3V M3 150µF, 16V ×2 + + GND M4 0.47µF 17 M5 16 VOUT 1.10V TO 1.85V 70A ×3 470µF, 6.3V KEMET CAP 19 18 D1 MBRS 340T3 M6 15 D2 MBRS 340T3 0.003Ω L2 75k 1 2 3 47pF 1000pF 4 10k 5 0.01µF 6 1nF 47k 7 6800pF 100pF VIN: 12V VOUT: 1.1V TO 1.85, 70A M1 TO M12: FDS7760A L1 TO L4: 1µH SUMIDA CEPH149-IROMC D7 TO D10: CENTROL CMDSH-3TR COUT: KEMET T510X477M006AS 8 9 VDIFFOUT 10 – VOS 11 VOS+ 12 1000pF 13 14 CLKOUT RUN/SS SENSE1+ TG1 SENSE1– SW1 BOOST1 EAIN VIN PLLFLTR BG1 PLLIN EXTVCC PHASMD LTC1629 ITH SGND INTVCC PGND BG2 VDIFFOUT VOS– BOOST2 VOS + SW2 SENSE2– TG2 SENSE2+ AMPMD L3 28 27 5V 0.003Ω 26 25 0.47µF 10Ω 24 M7 22 21 D9 20 D10 1µF 25V M9 M8 1µF 23 + 24k ×3 470µF, 6.3V KEMET CAP 150µF, 16V ×2 22µF 6.3V + D3 MBRS 340T3 + GND VIN 12V 19 18 17 0.47µF M10 M12 M11 16 15 D4 MBRS 340T3 0.003Ω L4 1706-82 TA02 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1628/LTC1628-PG Dual High Efficiency, 2-Phase Sync Step-Down Controller Constant Freq, Standby, 5V and 3.3V LDOs, 3.5V ≤ VIN ≤ 36V LTC1629/LTC1629-PG PolyPhase® High Efficiency Step-Down DC/DC Controller Expandable Up to 12 Phases, Up to 200A, Remote Sense Diff Amp LTC1702/LTC1703 Dual High Efficiency, 2-Phase Sync Step-Down Controller 550kHz, 25MHz GBW, No RSENSETM, 2.7V ≤ VIN ≤ 7V LTC1706-81 VID Voltage Programmer with Desktop Code VRM 8.2-VRM 8.4, VOUT Range: 1.3V to 3.5V LTC1709/LTC1709-8 2-Phase Sync Step-Down Controller with 5-Bit Desktop VID 4V ≤ VIN ≤ 36V, PLL, 36-Pin SSOP, Current Mode Operation LTC1735 High Efficiency Sync Step-Down Controller 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 LTC1929/LTC1929-PG 2-Phase Sync Step-Down Controller Current Mode Operation, IOUT Up to 40A, 3.5V ≤ VIN ≤ 36V LTC3732 IOUT ≤ 60A, VRM9.0/9.1 Compatible, 600kHz per Phase Operation, Integtrated MOSFET Drivers. 3-Phase, 5-Bit VID, Synchronous Step-Down Controller Burst Mode and PolyPhase are registered trademarks of Linear Technoogy Corporation. No RSENSE is a trademark of Linear Technology Corporation. 170682fa 8 Linear Technology Corporation LT/TP 1002 1K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2000