LTC1706-61 5-Bit VID Voltage Programmer for AMD Opteron CPUs FEATURES DESCRIPTIO n Programs Regulator Output Voltage Range from The LTC 1706-61 is a precision, digitally programmed, 0.8V to 1.55V in 25mV Steps resistive ladder which adjusts the output of any 0.6V n Programs a Wide Range of Linear Technology referenced regulator. Depending on the state of the five DC/DC Converters with a 0.6V Reference VID inputs, an output voltage between 0.8V and 1.55V is n 0.35% Accurate Output Voltage programmed in 25mV increments. n Built-In 40k Pull-Up Resistors on VID Inputs The LTC1706-61 is designed specifically to program n Available in MSOP-10 Package an entire family of Linear Technology DC/DC converters with on board 0.6V references. U APPLICATIO S The LTC1706-61 programs the following Linear TM Technology DC/DC converter products: LTC1629-6, n AMD Opteron Processor Power Supply LTC3714, LTC3731 and LTC3778. (Consult factory for n Workstations and Servers additional DC/DC converter products.) n Large Memory Array Supply , LTC and LT are registered trademarks of Linear Technology Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc. TYPICAL APPLICATIO 5-Bit VID-Controlled High Current Application (Simplified Block Diagram) V IN 4.5V TO 22V V IN LTC1629-6 TG1 L1 R V SENSE1 OUT 0.8V TO 1.55V SW1 V CC UP TO 80A VID0 + INTV CC BG1 C OUT VID1 SENSE V V DIFFOUT IN PGND FROM VID2 LTC1706-61 SGND P TG2 VID3 FB EAIN R L2 SENSE2 SW2 VID4 GND I TH BG2 V IN 4.5V TO 22V V IN LTC1629-6 TG1 L3 R SENSE3 SW1 BG1 V IN PGND SGND TG2 R EAIN L4 SENSE4 SW2 I TH BG2 1706-61 TA01 170661f 1 U ULTC1706-61 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-61 VID2 3 8 NC SENSE Pin ...................................................0.3V to 7V VID3 4 7 VID4 V 5 6 SENSE CC FB Pin ..........................................................0.3V to 7V MS MS PACKAGE Operating Ambient Temperature Range 10-LEAD PLASTIC MSOP PART MARKING T = 110 C, q = 120 C/ W (Note 2) .................................................. 40 C to 85 C JMAX JA LTK9 Junction Temperature........................................... 110 C Storage Temperature Range ................. 65 C to 150 C Consult LTC Marketing for parts specified with wider operating temperature ranges. Lead Temperature (Soldering, 10 sec).................. 300 C 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 610 14 kW FB-SENSE V Error % Output Voltage Accuracy l 0.35 + 0.35 % OUT 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 LTC1706EMS-61 is guaranteed to meet performance (V 0.6V)/40k. (See the VID Input Characteristics section for more specifications from 0 C to 70 C. Specifications over the 40 C to 85 C CC details.) operating 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.) 170661f 2 U W U W U WW