IR3084U Datasheet, PDF (1/47 Pages) International Rectifier – XPHASETM VR10, VR11 & OPTERON/ATHLON64 CONTROL IC

IR3084U
Data Sheet No. PD94719
XPHASE^TM VR10, VR11 & OPTERON/ATHLON64 CONTROL IC
DESCRIPTION
The IR3084U Control IC combined with an IR XPhase^TM 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
monitor a single phase of a multiphase converter. The XPhase^TM 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 Amplifier’s 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
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9/14/2005