LTC1706-81 5-Bit Desktop VID Voltage Programmer FEATURES DESCRIPTIO n Programs Regulator Output Voltage Range from The LTC 1706-81 is a precision, digitally programmed, 1.3V to 2.05V in 50mV Steps and from 2.1V to 3.5V resistive ladder which adjusts the output of any 0.8V in 100mV Steps (VRM 8.4) referenced regulator. Depending on the state of the five n Programs a Wide Range of Linear Technology VID inputs, an output voltage between 1.3V and 3.5V is DC/DC Converters with a 0.8V Reference programmed in 50mV and 100mV increments. n Fully Compliant with the Intel Pentium Processor The LTC1706-81 is designed specifically to program Desktop VID Specification an entire family of Linear Technology DC/DC converters in n 0.25% Accurate Output Voltage full compliance with the Intel Desktop (VRM 8.4) VID n Built-In 40k Pull-Up Resistors on VID Inputs specification. n Available in MSOP-10 Package The LTC1706-81 programs the following Linear U Technology DC/DC converter products: LTC1622, APPLICATIO S LTC1628, LTC1629, LTC1702, LTC1735, LTC1735-1, n Intel Pentium II and III Processor Power Supply LTC1772 and LTC1929. (Consult factory for future com- TM n AMD Athlon Processor Power Supply patible DC/DC converter products.) n Workstations and Servers , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. n Large Memory Array Supply AMD Athlon is a trademark of Advanced Micro Devices, Inc. TYPICAL APPLICATION 5-Bit VID-Controlled High Current 4-Phase Application (Simplified Block Diagram) V IN 4.5V TO 22V V IN LTC1629 TG1 L1 R V SENSE1 OUT SW1 1.3V TO 3.5V V CC UP TO 70A VID0 + INTV CC BG1 C OUT VID1 SENSE V V DIFFOUT IN PGND FROM VID2 LTC1706-81 SGND P TG2 VID3 FB R EAIN L2 SENSE2 SW2 VID4 GND BG2 V IN 4.5V TO 22V V IN LTC1629 TG1 L3 R SENSE3 SW1 BG1 V IN PGND SGND TG2 EAIN L4 R SENSE4 SW2 BG2 1706-81 TA01 1 U ULTC1706-81 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART (Voltages Referred to GND Pin) TOP VIEW NUMBER Input Supply Voltage (V ) ..........................0.3V to 7V CC VID0 1 10 FB VID1 2 9 GND VID Input Pins .............................................0.3V to 7V LTC1706EMS-81 VID2 3 8 NC VID3 4 7 VID4 SENSE Pin ...................................................0.3V to 7V V 5 6 SENSE CC FB Pin ..........................................................0.3V to 7V MS10 MS10 PACKAGE Operating Temperature Range (Note 2) .. 40 C to 85 C 10-LEAD PLASTIC MSOP PART MARKING Junction Temperature........................................... 110 C T = 110 C, q = 120 C/ W JMAX JA LTLR Storage Temperature Range ................. 65 C to 150 C Lead Temperature (Soldering, 10 sec).................. 300 C Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. A 2.7V V 5.5V, VID0 = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified. CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Supply Voltage Range 2.7 5.5 V CC I Supply Current (Note 3) 0.1 5 m A VCC R Resistance Between SENSE and FB l 12 20 28 kW FB-SENSE V Error % Output Voltage Accuracy Programmed from 1.3V to 2.05V (VID4 = 0) l 0.25 + 0.25 % OUT Programmed from 2.1V to 3.5V (VID4 = 1) l 0.35 + 0.25 % R VID Input Pull-Up Resistance V = 0.6V (Note 4) 40 kW PULLUP DIODE VID VID Input Voltage Threshold V (2.7V V 5.5V) 0.4 V TH IL CC V (2.7V V 5.5V) 1.6 V IH CC I VID Input Leakage Current V < VID < 7V (Note 4) 0.01 1 m A VID-LEAK CC V VID Pull-Up Voltage V = 3.3V 2.8 V PULLUP CC V = 5V 4.5 V CC Note 1: Absolute Maximum Ratings are those values beyond which the life Note 3: With all five VID inputs floating, the V supply current is simply CC of a device may be impaired. the device leakage current. However, the V supply current will rise and CC be approximately equal to the number of grounded VID input pins times Note 2: The LTC1706-81 is guaranteed to meet performance specifications (V 0.6V)/40k. (See the VID Input Characteristics section for more from 0 C to 70 C. Specifications over the 40 C to 85 C operating CC details.) temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: Each built-in pull-up resistor attached to the VID inputs also has a series diode connected to V to allow input voltages higher than the V CC CC supply without damage or clamping. (See Operation section for further details.) 2 U W U W U WW