ISL95866IRZ

Special Purpose Regulators Overview

The ISL95866IRZ is a 4+3 multiphase PWM regulator compliant with Intel IMVP8 standards, designed for desktop microprocessors supporting core (IA), graphics (GT), or unsliced graphics (GTUS/GTX). It provides control and protection for two voltage regulators: the first configurable for 4, 3, 2, or 1 phase, and the second for 3, 2, or 1 phase. The device operates on a 4.75 V to 5.25 V supply, delivering outputs from 0 V to 1.52 V with up to 120 A total current capability. It features an SMBus interface, integrated +12 V gate drivers, and supports DCR or resistor current sensing.

Special Purpose Regulators Feature Summary

• Implements Robust Ripple Regulator (R3) technology for faster transient settling and improved light-load efficiency via diode emulation mode.
• Integrates three +12 V gate drivers with two dedicated to the VR A output for simplified board design.
• Supports programmable SVID addresses to maximize flexibility in supporting various desktop processor SKUs.
• Features remote voltage sense, programmable I_MAX, adjustable switching frequency, and single VR_READY power-good indicator.

Special Purpose Regulators Applications

• Powering Intel Core (IA) processors in desktop systems
• Supplying power to Graphics (GT) units in desktop microprocessors
• Powering Unsliced Graphics (GTUS or GTX) configurations

Special Purpose Regulators Procurement Notes

Verify component authenticity through authorized Renesas channels due to potential counterfeit risks. Confirm package integrity as the unit utilizes a QFN-52 form factor requiring careful handling. Check for recent Product Change Notifications (PCN) regarding manufacturing site or material updates. Ensure compatibility with existing PCB footprints and thermal management designs before finalizing procurement decisions.

Special Purpose Regulators Selection Notes

Select this controller for applications requiring a complete IMVP8-compliant power solution for desktop CPUs. It is suitable when board area reduction is critical, as it replaces a two-chip approach by sharing a serial control bus. Consider its R3 modulation benefits for designs prioritizing transient response and light-load efficiency over traditional PWM architectures.

Special Purpose Regulators Part Context

The ISL95866 belongs to the ISL95866 series of multi-phase controllers from Renesas/Intersil. It is specifically engineered for the demanding power delivery requirements of modern desktop processors. The device integrates advanced control algorithms and protection features into a compact QFN-52 package, serving as a key component in high-performance computing power stages.

Special Purpose Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin-to-pin compatibility and electrical specifications with alternative models if sourcing constraints exist.

Special Purpose Regulators FAQ

How does the ISL95866 handle light-load efficiency?

It employs diode emulation mode with load-dependent low switching frequency to improve efficiency during light-load conditions.

What current sensing methods are supported?

The controller supports DCR current sensing with a single NTC thermistor for temperature compensation or resistor current sensing for higher precision.