ISL95812

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Multiphase PWM Regulator for VR12.5, VR12.6 and VR12.6+ CPUs

OVERVIEW

Fully compliant with Intel VR12.5, VR12.6 and VR12.6+™ specifications, the ISL95812 provides a complete solution for microprocessor core power supply. It provides a Voltage Regulator (VR) with two integrated and one external gate drivers. The VR can be configured as 3-, 2- or 1-phase, providing maximum flexibility. The VR uses the serial control bus (SVID) to communicate with the CPU and achieves lower cost and smaller board area.

Based on Intersil’s Robust Ripple Regulator (R3) technology™, the PWM modulator compared to traditional modulators, has faster transient settling time, variable switching frequency during load transients and has improved light load efficiency with its ability to automatically change switching frequency.

The ISL95812 has several other key features. The output supports DCR current sensing with single NTC thermistor for DCR temperature compensation or accurate resistor current sensing. The output comes with remote voltage sense, programmable VBOOT voltage, programmable ICCMAX , programmable voltage transition slew rate, adjustable switching frequency, overcurrent protection and Power-Good output.

KEY FEATURES

  • Serial data bus
  • Output configurable 3-, 2- or 1-phase using two integrated gate drivers
  • Precision core voltage regulation
  • 0.5% system accuracy over-temperature
  • Enhanced load line accuracy
  • Supports multiple current sensing methods
  • Lossless inductor DCR current sensing
  • Precision resistor current sensing
  • Differential remote voltage sensing
  • Programmable VBOOT voltage at start-up
  • Resistor programmable ICCMAX and voltage transition slew rate
  • Adaptive body diode conduction time reduction

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL95812
Basic Information
Production Status
Mass Production
Max # of Outputs
1
Max # of Phases
3
Input Voltage Min (V)
4.5
Input Voltage Max (V)
28
Output Voltage Min (V)
0.5
Output Voltage Max (V)
2.3
Output Current Max (A)
90
Bias Voltage Range (V)
4.75 to 5.25
VID
Yes
Parametric Applications
VR12.5, VR12.6 and VR12.6+T
Qualification Level
Standard
Droop
Yes
Integrated MOSFET Driver(s)
Yes
Can Sample
YES
Temperature Range
-40 to +100

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