ISL95838

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Dual 3+2 PWM Controller for IMVP-7/VR12™ CPUs

OVERVIEW

The ISL95838 Pulse Width Modulation (PWM) controller IC provides a complete solution for IMVP-7/VR12™ compliant microprocessor and graphic processor core power supplies. It provides the control and protection for two Voltage Regulators (VRs). The first VR, typical for Vcore, incorporates 2 integrated drivers and can operate in 3-, 2- or 1-phase configurations. The second VR, typical for Graphics, can operate in 2- or 1-phase configurations. The two VRs share a serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two-chip approach.

Both VRs utilize Intersils Robust Ripple Regulator R3 Technology™. The R3 modulator has numerous advantages compared to traditional modulators, including faster transient response, variable switching frequency during load transients, and improved light load efficiency due to its ability to automatically change switching frequency.

The ISL95838 has several other key features. Both outputs support either DCR current sensing with a single NTC thermistor for DCR temperature compensation, or more precise resistor current sensing if desired. Both outputs come with remote voltage sense, programmable VBOOT voltage, IMAX , and switching frequency, adjustable overcurrent protection and separate Power-Good signals.

KEY FEATURES

  • Serial Data Bus
  • Dual Outputs:
  • Configurable 3-, 2- or 1-phase for the 1st Output using two integrated Gate Drivers
  • Configurable 2- or 1-phase for the 2nd Output
  • R3 Modulator
  • Excellent Transient Response
  • 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, Switching Frequency for Both Outputs
  • Adaptive Body Diode Conduction Time Reduction

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL95838
Basic Information
Production Status
Mass Production
Max # of Outputs
2
Max # of Phases
3
Input Voltage Min (V)
25
Input Voltage Max (V)
4.75
Output Voltage Min (V)
0.25
Output Voltage Max (V)
1.52
Output Current Max (A)
30
Bias Voltage Range (V)
4.75 to 5.25
VID
Yes
Parametric Applications
VR12/IMVP7
Qualification Level
Standard
Droop
Yes
Integrated MOSFET Driver (s)
Yes
Can Sample
YES
Temperature Range
-40 to +100

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