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Renesas ISL95866IRZ
- Part No.:
- ISL95866IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
ISL95866IRZ.pdf
- Description:
- IC PWM CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
ISL95866IRZ from Renesas Electronics (formerly Intersil) is a dual-output, multiphase R3™ PWM controller compliant with Intel IMVP8™ for desktop CPU core (IA), graphics (GT), and unsliced graphics (GTX) power delivery. It supports 4+3 phase configuration, integrated +12V gate drivers (two for VR A, one for VR B), SMBus/SVID interface, and DCR/resistor current sensing with 0.5% system voltage accuracy over temperature.
For engineers reviewing the ISL95866IRZ datasheet, ISL95866IRZ pinout, ISL95866IRZ application, or ISL95866IRZ equivalent, key selection considerations include IMVP8™ compliance, dual-VR programmability, R3™ modulator transient response, diode emulation mode for light-load efficiency, and SMBus-configurable droop/OVP/OCP enablement.
Technical Context
The ISL95866IRZ implements two independent voltage regulator controllers: VR A configurable for 4/3/2/1-phase operation with two integrated +12V gate drivers, and VR B for 3/2/1-phase with one +12V gate driver. Both share a common SMBus interface supporting SVID conflict-free communication with Intel CPUs.
Its R3™ modulator enables variable switching frequency during load transients, phase shedding per power state (PS0–PS2), and diode emulation in single-phase mode to improve light-load efficiency. Current sensing supports lossless DCR with NTC compensation or precision resistor-based methods, both with remote differential voltage sensing and programmable IMAX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IMVP8™ Compliance | Fully compliant with Intel IMVP8 specification for desktop IA/GT/GTX power delivery, enabling direct integration into validated IMVP8 platforms. |
| Phase Configuration | VR A: 4/3/2/1-phase; VR B: 3/2/1-phase - supports flexible VR design scaling across processor SKUs without hardware change. |
| Gate Drivers | Three integrated +12V drivers: two dedicated to VR A, one to VR B - eliminates need for external high-side drivers and reduces BOM count. |
| SMBus Interface | Full SVID support with droop enable/disable, voltage offset adjustment, and OVP/OCP disable - enables dynamic runtime tuning via CPU command. |
| Current Sensing | DCR sensing with NTC thermistor compensation OR precision resistor sensing - provides design flexibility for accuracy vs. cost trade-offs. |
| Voltage Accuracy | ±0.5% system accuracy over temperature - ensures tight regulation across operating range for stable CPU/GPU operation. |
| R3™ Modulator | Variable-frequency control with phase shedding and diode emulation - delivers faster transient settling and >90% efficiency at light loads (e.g., PS0 idle). |
Pinout & Package
ISL95866IRZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95866 datasheet (FN8821), including VR_A and VR_B phase control, SMBus I/O, sense inputs, gate drive outputs, and power-good signaling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A / VIN_B | Input voltage supply for VR A and VR B channels | Accepts +12V input; decoupling required per channel to minimize noise coupling between VRs. |
| PHASE_Ax / PHASE_Bx | Phase output terminals (A0–A3, B0–B2) | Drive external high-side MOSFET gates; VR A supports up to four phases, VR B up to three. |
| SMBCLK / SMBDAT | SMBus clock and data lines | Enable bidirectional SVID communication with CPU for voltage setpoint, droop, and protection control. |
| VSNS_A+/VSNS_A− VSNS_B+/VSNS_B− | Differential remote sense inputs | Compensate for IR drop across PCB traces; ensure accurate voltage regulation at CPU/GPU VDD pins. |
| PGOOD | Power-good indicator output | Open-drain signal asserting when both VR outputs meet regulation and sequencing requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Dual VR with independent phase control | Enables simultaneous, optimized power delivery to CPU core and GPU on shared motherboard without inter-channel interference. |
| R3™ modulator with diode emulation | Reduces switching losses at light loads by disabling synchronous rectification and enabling body-diode conduction - improves PS0 efficiency by ≥5% vs. fixed-frequency designs. |
| Programmable SVID address | Allows multiple ISL95866IRZ controllers on same SMBus without address conflict - supports multi-VR systems in high-end desktops. |
| Adaptive body diode conduction time reduction | Minimizes reverse recovery losses in high-side FETs during light-load transitions - extends FET lifetime and reduces thermal stress. |
| Resistor-programmable IMAX and fSW | Permits precise current limit setting and frequency tuning (e.g., 200–1000kHz) without firmware changes - accelerates board-level validation. |
Applications
| Desktop CPU Core Power | Discrete GPU Power |
|---|---|
Use Scenario: Power delivery to Intel 6th–8th Gen desktop CPUs (e.g., Core i7-7700K) requiring IMVP8-compliant core (IA) rail with fast transient response. IC Role / Device Role / Timing Role: Primary multiphase PWM controller managing up to 4-phase VR for IA domain, coordinating with CPU via SMBus for dynamic voltage/frequency scaling. Use Value: Delivers ±0.5% voltage accuracy and sub-10µs transient recovery - prevents CPU throttling during burst workloads like gaming or compilation. | Use Scenario: Dedicated VR for NVIDIA GTX 10-series or AMD RX 400-series discrete GPUs on high-performance desktop motherboards. IC Role / Device Role / Timing Role: Secondary 3-phase VR controller (VR B) supplying GTUS/GTX rail with independent current limit and remote sensing. Use Value: Enables GPU-specific droop tuning and OVP disable during overclocking - maintains stability under sustained 200W+ loads. |
| Unsliced Graphics Power | Multi-SKU Platform Support |
Use Scenario: Power solution for Intel "unsliced" graphics configurations where GT and GTUS rails operate independently on same die. IC Role / Device Role / Timing Role: Dual-VR architecture allows VR A to regulate GT and VR B to regulate GTUS, each with separate phase count and IMAX settings. Use Value: Eliminates need for separate controllers - reduces PCB area by 35% and simplifies thermal layout vs. dual-chip solutions. | Use Scenario: Motherboard platforms targeting multiple CPU SKUs (e.g., i3/i5/i7) with varying phase requirements and current limits. IC Role / Device Role / Timing Role: Resistor-programmable address, IMAX, and fSW allow single ISL95866IRZ design to support all SKUs via BOM change only. Use Value: Reduces NRE and validation effort - one schematic/layout covers 90% of mainstream desktop SKUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8806AZQW | Single-output IMVP8 controller (4-phase only); no VR B channel; uses analog PWM instead of R3™ modulator. | Requires second controller for GT/GTX rails; lacks SMBus voltage offset and droop control. | Choose when only core rail is needed and cost-per-phase is prioritized over integration. |
| ISL95865IRZ | Pin-compatible predecessor with identical 4+3 phase capability but no SMBus OVP/OCP disable or adaptive body diode control. | Supports legacy IMVP8 platforms but lacks runtime protection reconfiguration required for advanced overclocking. | Choose for backward compatibility where firmware does not require dynamic OVP disable. |
Compared with RT8806AZQW and ISL95866IRZ, the ISL95866IRZ uniquely integrates dual VR control, SMBus-configurable protections, and R3™-enhanced light-load efficiency - making it optimal for space-constrained, feature-rich IMVP8 desktop motherboards.
Availability
ISL95866IRZ is available at Aetrix Electronics and suitable for high-performance desktop CPU power delivery, discrete GPU VR design, unsliced graphics power management, and multi-SKU motherboard production requiring stable component supply and long-term lifecycle support.
Supply support for ISL95866IRZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics acquired Intersil in 2017 and continues its high-performance analog and power management IC portfolio with ISO 9001-certified manufacturing.
The ISL95866IRZ belongs to Renesas' IMVP8-compliant multiphase controller product line, engineered specifically for efficient, tightly regulated, and dynamically configurable power delivery to Intel desktop processors and associated graphics subsystems.
FAQ
What is the primary function of the ISL95866IRZ in a desktop motherboard?
The ISL95866IRZ serves as a dual-output multiphase PWM controller that manages power delivery to both the CPU core (IA) and graphics (GT/GTX) domains under Intel IMVP8™ specifications. It integrates gate drivers, SMBus interface, and R3™ modulation to deliver precise, efficient, and dynamically adjustable voltage regulation - directly enabling features like SpeedStep and GPU Boost on compatible desktop platforms.
Does the ISL95866IRZ support both DCR and resistor-based current sensing?
Yes, the ISL95866IRZ supports two current-sensing methods: lossless inductor DCR sensing with NTC thermistor compensation for temperature drift correction, and precision resistor-based sensing for higher accuracy where board space permits. Both methods are fully supported with differential remote voltage sensing and programmable IMAX thresholds per VR output.
How does the R3™ modulator in the ISL95866IRZ improve transient response compared to traditional PWM controllers?
The R3™ modulator in the ISL95866IRZ achieves faster transient settling by dynamically adjusting switching frequency in response to load steps and enabling phase shedding across power states (PS0–PS2). Unlike fixed-frequency controllers, it reduces recovery time to under 10 µs during 50% load steps - critical for preventing voltage droop during CPU burst workloads such as gaming or video encoding.
Can the ISL95866IRZ be used for both CPU core and GPU power rails simultaneously?
Yes, the ISL95866IRZ is explicitly designed for concurrent dual-rail operation: VR A configures up to 4 phases for the CPU core (IA), while VR B configures up to 3 phases for graphics (GT, GTUS, or GTX). Both rails share SMBus communication but maintain independent current limits, switching frequencies, and remote sensing - enabling co-located, interference-free power delivery on compact desktop PCBs.
What SMBus/SVID functions are configurable on the ISL95866IRZ?
The ISL95866IRZ supports full SVID-compliant SMBus commands including droop enable/disable, output voltage offset adjustment (±10 mV steps), and OVP/OCP protection disable - all executed dynamically by the CPU without requiring firmware updates or hardware modification. This enables real-time tuning for overclocking, thermal throttling, and platform-specific power policies.
ISL95866IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- IMVP8™ Compliant Desktops
- Voltage - Input:
- 9V ~ 20V
- Number of Outputs:
- 2
- Voltage - Output:
- 0V ~ 1.52V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN (6x6)
ISL95866IRZ FAQ
1.How can I place an order for ISL95866IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95866IRZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL95866IRZ reliable?
The price and inventory of ISL95866IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95866IRZ is usually 5 days.
3.What payment methods are accepted for ISL95866IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95866IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95866IRZ?
ISL95866IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95866IRZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL95866IRZ?
For technical support, including ISL95866IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95866IRZ requirements.
6.How does Aetrix verify that ISL95866IRZ is sourced from the original manufacturer or authorized distributors?
All ISL95866IRZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL95866IRZ meets industry standards.
7.What is the process for return or replacement of ISL95866IRZ?
All ISL95866IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95866IRZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL95866IRZ part is unused and in its original packaging.
Return procedure for ISL95866IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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