LTC1706-82_1

LTC1706-82 VID Voltage Programmer for Intel VRM9.0/9.1 FEATURES s s DESCRIPTIO s s s s 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 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. 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. 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. APPLICATIO S s s s s Intel Pentium® III Processor Power Supply Multiprocessor Workstations and Servers Multiphase Processor Power Supply AMD AthlonTM Processor Power Supply TYPICAL APPLICATIO VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram) VIN 4.5V TO 22V VIN INTVCC VID0 VID1 FROM µP VCC SENSE LTC1629 VDIFFOUT SGND FB GND EAIN TG2 SW2 BG2 VIN 4.5V TO 22V VIN LTC1629 TG1 SW1 BG1 PGND SGND EAIN NOTE: UP TO SIX LTC1629s CAN BE PARALLELED TO DELIVER AS MUCH AS 200A TG2 SW2 BG2 1706-82 TA01 TG1 SW1 BG1 PGND VIN L1 RSENSE1 VID2 LTC1706-82 VID3 VID4 L2 RSENSE2 L3 RSENSE3 VIN L4 RSENSE4 U + VOUT 1.10V TO 1.85V UP TO 70A COUT 170682fa U U 1 LTC1706-82 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO 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 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 LTC1706EMS-82 MS PART MARKING LTMJ MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 110°C, θJA = 200°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. The q 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 VCC IVCC RFB-SENSE VOUT Error % RPULLUP VIDT 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 Programmed From 1.10V to 1.85V 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 ±1.00 (Note 3) q q ELECTRICAL CHARACTERISTICS CONDITIONS MIN 2.7 TYP 0.1 MAX 5.5 5.0 14 0.25 UNITS V µA kΩ % kΩ V V µA V V 6 – 0.25 10 40 0.4 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. 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 U W U U WW W LTC1706-82 TYPICAL PERFOR A CE CHARACTERISTICS Typical Error % vs Output Voltage 0.25 TA = 25°C ERROR (%) 0 ERROR (%) –0.25 1.1 1.2 1.3 1.4 1.5 1.6 1.7 OUTPUT VOLTAGE (V) 1.8 1706-82 G01 RFB1 vs Temperature 30 150 130 110 90 70 50 0 –50 20 RFB1 (kΩ) 10 VID PULL-UP CURRENT (µA) 0 50 TEMPERATURE (°C) Supply Current vs Temperature 2.0 ALL VID INPUTS OPEN 5 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 1.5 1.0 VCC = 5V 0.5 VCC = 3.3V 0 –50 0 50 TEMPERATURE (°C) UW Typical Error % vs Temperature 0.25 VOUT = 1.1V VOUT = 1.5V VOUT = 1.85V 0 –0.25 –50 0 50 TEMPERATURE (°C) 100 1706-82 G02 IVID-PULLUP vs Temperature VCC = 5V VID4 = 0V VID0 = VID1 = VID2 = VID3 = OPEN 100 1706-82 G03 30 –50 0 50 TEMPERATURE (°C) 100 1706-82 G04 Supply Current vs Supply Voltage ALL VID INPUTS OPEN TA = 25°C 4 3 2 VCC = 2.7V 1 100 1706-82 G05 0 0 2 4 6 SUPPLY VOLTAGE (V) 8 1706-82 G06 170682fa 3 LTC1706-82 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. VID1 (Pin 2): 4th MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID1 adds 50mV 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. 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. SENSE (Pin 6): Regulator Output Voltage. Connect directly to regulator output sense node or VDIFFOUT when used with the LTC1629 and LTC1929. VID4 (Pin 7): MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID4 adds 400mV 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 0.8V feedback pin of a compatible regulator or the EAIN pin of the LTC1629, LTC1929 and LTC3729. PI TABLE PIN 1 2 3 4 5 6 7 8 9 10 NAME VID0 VID1 VID2 VID3 VCC SENSE VID4 NC GND FB Ground 0.8V Feedback Input 0 0 0.8 1.075 – 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 MSB Programmable Input MIN 0 0 0 0 2.7 1.075 0 NOMINAL (V) TYP MAX VCC VCC VCC VCC 5.5 1.85 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 4 U U U U 170682fa LTC1706-82 BLOCK DIAGRA VCC 40k VID0 1 VCC VCC 5 40k VID1 2 VCC SWITCH CONTROL LOGIC 40k VID2 3 RFB2 RFB1 10k VCC 40k VID3 4 VID4 7 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. W 6 SENSE 10 FB 9 GND 1706-82 BD VCC 40k U 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 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. 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, 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. 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 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 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 U 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 1.850 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 1.225V 1.200V 1.175V 1.150V 1.125V 1.100V NO_CPU (1.075V) LTC1706-82 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. PACKAGE DESCRIPTIO (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) 10 9 8 7 6 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) GAUGE PLANE DETAIL “A” 0° – 6° TYP DETAIL “A” 0.18 (.007) SEATING PLANE 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. U MS Package 10-Lead Plastic MSOP 0.497 ± 0.076 (.0196 ± .003) REF 4.90 ± 0.15 (1.93 ± .006) 3.00 ± 0.102 (.118 ± .004) NOTE 4 12345 0.53 ± 0.01 (.021 ± .006) 1.10 (.043) MAX 0.86 (.034) REF 0.17 – 0.27 (.007 – .011) TYP 0.50 (.0197) BSC 0.13 ± 0.076 (.005 ± .003) MSOP (MS) 0802 U W U U 170682fa 7 LTC1706-82 TYPICAL APPLICATIO OPTIONAL SYNC CLOCK IN 5 1 2 FROM µP 3 4 7 VCC VID0 VID1 VID2 VID3 FB VID4 GND 9 SENSE LTC1706-82 10 6 0.33µF 100pF 47k 6800pF VDIFFOUT VOS– VOS+ 9 10 11 12 SGND VDIFFOUT VOS– VOS + PGND BG2 BOOST2 SW2 TG2 AMPMD 20 19 18 17 16 15 D8 0.47µF 1000pF 13 14 SENSE2– SENSE2+ 24k 75k 1 2 47pF 10k 0.01µF 1nF 47k 6800pF 100pF VDIFFOUT VOS 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 – RUN/SS SENSE1+ SENSE1– EAIN PLLFLTR PLLIN PHASMD ITH SGND VDIFFOUT VOS– VOS + CLKOUT TG1 SW1 BOOST1 VIN BG1 EXTVCC LTC1629 INTVCC PGND BG2 BOOST2 SW2 TG2 AMPMD 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.47µF M10 M11 D9 D10 1µF 1µF 25V 150µF, 16V ×2 0.47µF 10Ω M7 M8 5V 3 1000pF 4 5 6 7 8 9 10 11 12 VOS+ 1000pF 13 14 SENSE2– SENSE2+ RELATED PARTS PART NUMBER DESCRIPTION COMMENTS 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 Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection, 3.5V ≤ VIN ≤ 36V GN-24, Power Good, Output Fault Protection, 3.5V ≤ VIN ≤ 36V 6-Pin SOT-23, 2.5V ≤ VIN ≤ 10V, 550kHz, Burst Mode® Operation Current Mode Operation, IOUT Up to 40A, 3.5V ≤ VIN ≤ 36V IOUT ≤ 60A, VRM9.0/9.1 Compatible, 600kHz per Phase Operation, Integtrated MOSFET Drivers. 170682fa LTC1628/LTC1628-PG Dual High Efficiency, 2-Phase Sync Step-Down Controller LTC1629/LTC1629-PG PolyPhase® High Efficiency Step-Down DC/DC Controller LTC1702/LTC1703 LTC1706-81 LTC1709/LTC1709-8 LTC1735 LTC1736 LTC1772 LTC3732 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 High Efficiency Sync Step-Down Controller High Efficiency Sync Buck Controller with 5-Bit Mobile VID SOT-23 Low Voltage Step-Down Controller 3-Phase, 5-Bit VID, Synchronous Step-Down Controller LTC1929/LTC1929-PG 2-Phase Sync Step-Down Controller Burst Mode and PolyPhase are registered trademarks of Linear Technoogy Corporation. No RSENSE is a trademark of Linear Technology Corporation. 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q www.linear.com + + U VID Controlled High Current 70A 4-Phase Power Supply 1 0.33µF 2 3 1000pF 4 5 6 7 8 RUN/SS SENSE1 + CLKOUT TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC 28 27 26 25 24 23 22 21 D7 1µF 1µF 25V 150µF, 16V ×2 0.47µF 10Ω M1 M2 5V L1 0.003Ω SENSE1– EAIN PLLFLTR PLLIN PHASMD ITH LTC1629 M3 D1 MBRS 340T3 22µF 6.3V + M4 GND ×3 470µF, 6.3V KEMET CAP D2 MBRS 340T3 0.003Ω L2 + VOUT 1.10V TO 1.85V 70A M5 M6 L3 0.003Ω D3 MBRS 340T3 ×3 470µF, 6.3V KEMET CAP M9 22µF 6.3V + GND + VIN 12V D4 MBRS 340T3 0.003Ω L4 1706-82 TA02 M12 LT/TP 1002 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2000