ISL95821

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Three Phase PWM Controller for Intel VR12.5™ CPUs

Product Status: Mass Production

OVERVIEW

The ISL95821 Pulse Width Modulation (PWM) controller IC provides a complete low-cost solution for Intel VR12.5™ compliant microprocessor core power supplies. It provides the control and protection for a Voltage Regulator (VR). The VR incorporates 3 integrated drivers and can operate in 3-, 2- or 1-phase configurations. The VR uses a serial control bus to communicate with the CPU and achieve lower cost and smaller board area.

The VR utilizes Intersil’s Robust Ripple Regulator R3 Technology™. The R3™ modulator has many advantages compared to traditional modulators, including faster transient response, variable switching frequency in response to load transients, and improved light load efficiency due to diode emulation mode with load-dependent low switching frequency.

The ISL95821 has several other key features. It supports either DCR current sensing with a single NTC thermistor for DCR temperature compensation, or more precise resistor current sensing if desired. The output comes with remote voltage sense, programmable VBOOT voltage, IMAX , voltage transition slew rate and switching frequency, adjustable overcurrent protection and Power-Good signal.

KEY FEATURES

  • Serial data bus
  • Configurable 3-, 2- or 1-phase output with integrated gate drivers
  • R3™ modulator
  • Excellent transient response
  • Phase shedding with power state selection
  • Diode emulation in single-phase for high light-load efficiency
  • 0.5% system accuracy over-temperature
  • 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 IMAX, loadline, diode emulation, slope compensation, and switching frequency
  • Adaptive body diode conduction time reduction

PARAMETRICS

Parameters
ISL95821
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
Qualification Level
Standard
Droop
Yes
Integrated MOSFET Driver (s)
Yes
Can Sample
YES
Temperature Range
0 to +70

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