ISL95835

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3+1 and 1+1 Voltage Regulator for IMVP-7/VR12™ CPUs

Product Status: Mass Production

OVERVIEW

Compliant with IMVP-7/VR12™, the ISL95835 provides a complete solution for microprocessor and graphic processor core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers. The first VR can be configured as 3-, 2- or 1-phase VR while the second output is 1-phase VR, providing maximum flexibility. The two VRs share the serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two-chip approach.

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 It's ability to automatically change switching frequency. The ISL95835 has several other key features. Both outputs support DCR current sensing with single NTC thermistor for DCR temperature compensation or accurate resistor current sensing. Both outputs come with remote voltage sense, programmable VBOOT voltage, programmable IMAX , TMAX , adjustable switching frequency, OC protection and separate Power-Good.

The ISL95837 can be considered as ISL95835 dedicated for 1+1 application. VR1 and VR2 are both 1-phase VR.

KEY FEATURES

  • Serial Data Bus
  • Dual Outputs:
  • Configurable 3-, 2- or 1-phase for the 1st Output using 2 integrated Gate Drivers
  • 1-phase for the 2nd Output using an Integrated Gate Driver
  • 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, TMAX for Both Outputs
  • Adaptive Body Diode Conduction Time Reduction

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL95835
Basic Information
Production Status
Mass Production
iSim Model
YES
Max # of Outputs
2
Max # of Phases
3
Input Voltage Min (V)
4.5
Input Voltage Max (V)
5.5
Output Voltage Min (V)
0
Output Voltage Max (V)
1.52
Output Current Max (A)
90
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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