IR3084U TM XPHASE VR10, VR11 & OPTERON/ATHLON64 CONTROL IC DESCRIPTION TM The IR3084U Control IC combined with an IR XPhase Phase IC provides a full featured and flexible way to implement a complete VR10, VR11, Opteron, or Athlon64 power solution. The Control IC provides overall system control and interfaces with any number of Phase ICs which each drive and TM monitor a single phase of a multiphase converter. The XPhase architecture results in a power supply that is smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches. The IR3084U is based on the IR3084 VR10 Control IC, but incorporates the following modifications Supports VR11 7-bit VID, VR10 7-bit extended VID, and Opteron/Athlon64 5-bit VID codes Supports both VR11 and legacy Opteron/Athlon64 start-up sequences VID Select pin sets the DAC to VR10, VR11, or Opteron/Athlon64 INTL MD output pin indicates which DAC is selected Intel or AMD VOSENS float detection protects the CPU in the event that the VOSENS trace is broken Enable Input Thresholds set by VID Select pin to either VR10, VR11 or Opteron/Athlon64 VID Input Thresholds set by VID Select pin to either 0.6V (VR10/VR11) or 1.24V (AMD) No-Load Setpoint Current changes polarity based on VID Select to accommodate VR10, VR11 (negative offset from DAC) or Opteron/Athlon64 (positive offset from DAC). FEATURES 1 to X phase operation with matching Phase IC 7-bit VR 10/11 compatible VID with 0.5% overall system set point accuracy 5-bit Opteron/Athlon64 compatible VID with 1% overall system set point accuracy Programmable Dynamic VID Slew Rate +/-300mV Differential Remote Sense Programmable VID Offset Voltage at the Error Amplifiers Non-Inverting Input allows Zero Offset Programmable 150kHz to 1MHz oscillator Programmable VID Offset and Load Line output impedance Programmable Hiccup Over-Current Protection with Delay to prevent false triggering Simplified VR Ready output provides indication of proper operation and avoids false triggering Operates from 12V input with 9.9V Under-Voltage Lockout 6.8V/6mA Bias Regulator provides System Reference Voltage Phase IC Gate Driver Bias Regulator / VRHOT Comparator Reduced Over-Current Detect Delay eliminates and external resistor in typical applications Small thermally enhanced 28L MLPQ package Page 1 of 47 June 1, 2009 IR3084U TYPICAL APPLICATION CIRCUIT CCP1 100pF EA +5.0V RT2 R117 4.7K, B=4450 1.21K RCP CCP R1331 Q4 2.49K 56nF VREG 12V FILTERED 1 CJD200 VGDRIVE R137 RFB1 CFB 2K 162 12nF C204 C135 18 U5 0.1uF 1uF VCC SENSE 17 27 EAOUT VR RDY FB VRRDY 15 ISHARE IIN RFB 19 RMP RMPOUT C1009 348 RDRP1 20 VBIAS VBIAS 1nF 750 VSS SENSE RDRP C134 C89 750 0.1uF 100pF IR3084UMTR Q5 24 REGDRV 16 23 VDRP REGFB 25 REGSET 28 OUTEN ENABLE 9 2 RVGDRV CVGDRV VID0 VID0 INTL MD 8 97.6K 10nF VID1 VID1 7 VID2 VID2 6 VID3 VID3 5 Q6 VID4 VID4 4 VID5 VID5 3 VID6 VID6 RVSETPT1 1 VID SEL VIDSEL 124 14 VSETPT VREG 12V FILTERED RVSETPT 21 124 VCC 13 OCSET R30 C130 ROCSET 10 26 SS/DEL 12.7K 0.1uF 12 VDAC VDAC CSS/DEL 0.1uF RVDAC 11 3.5 CVDAC VOSNS-- LGND ROSC 33nF ROSC 30.1K 10 22 Page 2 of 47 June 1, 2009