The ISL95857C provides a complete power solution for Intel microprocessors supporting core, graphics, and system agent rails and is compliant with Intel IMVP8. The controller provides control and protection for three Voltage Regulator (VR) outputs. The VR A and VR C outputs support 1-phase operation only, while VR B is configurable for 2- or 1-phase operation. The address options programmable for these three outputs allow for maximum flexibility in support of the IMVP8 CPU. All three VRs share a common serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with a two-chip approach. Based on Intersil’s Robust Ripple Regulator (R3™) technology, the R3 modulator has many advantages compared to traditional modulators. These include faster transient settling time, variable switching frequency in response to load transients, and improved light-load efficiency due to diode emulation (DE) mode with load-dependent low switching frequency. The controller provides PWM outputs, which support Intel DrMOS power stages (or similar) and discrete power stages using the Intersil ISL95808 high voltage synchronous rectified buck MOSFET driver. The controller complies with IMVP8 PS4 power requirements and supports compatible power stages and drivers. The ISL95857C supports the system input power monitor (PSYS) option. The controller supports either DCR current sensing with a single NTC thermistor for DCR temperature compensation, or more precision through resistor current sensing if desired. All three outputs feature remote voltage sense, programmable IMAX, adjustable switching frequency, OC protection, and a single VR_READY power-good indicator.


  • Supports the Intel serial data bus interface
  • Fully supports PS4 Power Domain entry/exit
  • Supports system input power monitor (PSYS)
  • Three output controller
  • VR A supports 1-phase VR design
  • VR B configurable for 2- or 1-phase VR design
  • VR C supports 1-phase VR design
  • 0.5% system accuracy over temperature
  • Low supply current in PS4 state
  • Supports multiple current sensing methods
  • Lossless inductor DCR current sensing
  • Precision resistor current sensing
  • Differential remote voltage sensing
  • Programmable SVID address
  • Resistor programmable address selection, IMAX, and switching frequency

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFN Tube 60
Active TQFN Reel 6000
Active TQFN Tube 60
Active TQFN Reel 6000

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL95857C Data Short Short Form Datasheet PDF 220 KB
ISL95857C Datasheet Datasheet PDF 4.30 MB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB