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Renesas ISL95866CIRZ-T
- Part No.:
- ISL95866CIRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
ISL95866CIRZ-T.pdf
- Description:
- IC REG IMVP8 DESKTOP 2OUT 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:312
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Product details
Overview
ISL95866CIRZ-T from Renesas Electronics is a dual-output, multiphase PWM controller compliant with Intel IMVP8™ for desktop CPUs, supporting 4+3 phase configurations (VR A: 4/3/2/1-phase; VR B: 3/2/1-phase), featuring integrated +12V gate drivers, SMBus interface, and R3™ modulator technology for fast transient response and diode emulation mode. It delivers 0.5% system voltage accuracy over temperature and supports DCR/resistor current sensing in IMVP8-compliant desktop power delivery.
For engineers reviewing the ISL95866CIRZ-T datasheet, ISL95866CIRZ-T pinout, ISL95866CIRZ-T application, or ISL95866CIRZ-T equivalent, key selection considerations include IMVP8 SVID compliance, dual-VR phase configurability, integrated gate driver count per output, SMBus programmable droop/voltage offset, and R3™ modulator behavior under light-load and transient conditions.
Technical Context
The ISL95866CIRZ-T implements two independent voltage regulator controllers sharing a single SMBus interface for SVID communication with Intel CPUs. VR A supports up to four phases with two integrated +12V gate drivers; VR B supports up to three phases with one integrated +12V gate driver. Both outputs feature differential remote sensing, programmable IMAX, adjustable switching frequency, and unified VR_READY signal.
Based on Renesas' Robust Ripple Regulator R3™ architecture, the controller enables variable-frequency operation during load transients and enters diode emulation mode in single-phase operation to improve light-load efficiency. Current sensing supports lossless DCR with NTC compensation or precision resistor-based methods - both validated for IMVP8-compliant core and graphics rail regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Compliance | Intel IMVP8™ specification - ensures interoperability with CFL/CNL desktop processors for core (IA), graphics (GT), and unsliced graphics (GTUS/GTX) rails. |
| Output Configuration | Dual VR: VR A configurable as 4/3/2/1-phase; VR B as 3/2/1-phase - enables scalable power delivery matching CPU SKU requirements. |
| Gate Drivers | Three integrated +12V drivers: two for VR A, one for VR B - eliminates need for external high-side drivers in standard designs. |
| Accuracy | ±0.5% system voltage accuracy over temperature - meets IMVP8 tight regulation requirement for stable CPU operation. |
| Current Sensing | Supports DCR sensing with NTC compensation or precision shunt resistors - allows optimization of cost vs. accuracy in production layouts. |
| Interface | SMBus-compatible SVID interface - enables dynamic voltage offset, droop enable/disable, and OVP/OCP control without additional MCU firmware. |
Pinout & Package
ISL95866CIRZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per Renesas FN8974 Rev.0.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A / VIN_B | Input voltage supply pins | Separate 12V inputs for VR A and VR B power stages - enables independent input filtering and fault isolation. |
| PHASE_Ax / PHASE_Bx | Phase driver outputs | Drive external high-side MOSFETs; VR A has four phase outputs, VR B has three - matches configured phase count. |
| SVID_DATA / SVID_CLK | SMBus interface signals | Two-wire bidirectional bus for SVID communication with CPU - supports address conflict-free multi-controller systems. |
| VR_READY | Power-good indicator | Single open-drain output signaling valid regulation on both VRs - simplifies system power sequencing logic. |
| IMON_A / IMON_B | Current sense inputs | Differential inputs accepting DCR voltage or shunt resistor voltage - supports selectable sensing method per VR. |
Key Features
| Feature | Design Value |
|---|---|
| Green hybrid digital R3™ modulator | Variable switching frequency adapts to load transients; diode emulation in single-phase reduces switching losses at light loads. |
| Programmable SVID address | Resistor-selectable address enables multiple ISL95866CIRZ-T controllers on same SMBus without conflict - critical for multi-rail platforms. |
| Dual VR with shared VR_READY | Single power-good signal confirms regulation stability across both core and graphics rails - reduces motherboard GPIO count. |
| Phase shedding with power state selection | Automatically reduces active phases during low-power states (PS0/PS1/PS2) - improves efficiency without firmware intervention. |
| SMBus programmable protections | OVP and OCP can be disabled via SMBus - allows safe debug mode or custom protection schemes under controlled conditions. |
Applications
| Desktop CPU Core Power Delivery | Desktop GPU Graphics Rail |
|---|---|
Use Scenario: Powering Intel CFL/CNL CPU core (IA) rail in ATX desktop motherboards with strict IMVP8 timing and voltage accuracy requirements. IC Role / Device Role / Timing Role: Primary multiphase PWM controller managing up to 4-phase buck conversion with SVID feedback loop closure. Use Value: Achieves ±0.5% voltage accuracy and sub-10µs transient recovery - directly satisfies IMVP8 core rail regulation spec. | Use Scenario: Delivering regulated power to integrated or discrete GPU graphics (GT/GTUS) rail on high-performance desktop platforms. IC Role / Device Role / Timing Role: Secondary VR controller operating in 3-phase mode, synchronized to core VR via shared SMBus and VR_READY. Use Value: Enables independent graphics rail tuning (voltage offset, droop) while sharing control infrastructure - reduces BOM and layout area. |
| Multi-SKU Platform Power Architecture | Energy-Efficient Light-Load Operation |
Use Scenario: Supporting multiple CPU SKUs (e.g., i5/i7/i9) on same motherboard design through configurable phase count and SVID address. IC Role / Device Role / Timing Role: Dual-VR controller with resistor-programmable IMAX, frequency, and address - enables one PCB to serve diverse performance tiers. Use Value: Eliminates need for separate controller variants per SKU - lowers inventory complexity and NRE cost. | Use Scenario: Maintaining high efficiency during idle or low-utilization states (e.g., Windows Modern Standby, video playback). IC Role / Device Role / Timing Role: R3™ modulator entering diode emulation mode and reducing switching frequency in single-phase operation. Use Value: Extends >85% efficiency down to <5A load - directly improves platform C-state efficiency metrics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output IMVP8-compliant desktop CPU power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95865CIRZ-T | Single-output IMVP8 controller (4-phase only); lacks VR B channel and second SMBus-configurable VR. | Only suitable for core-rail-only designs; cannot support independent graphics rail regulation. | Select when platform uses discrete GPU or integrates graphics power elsewhere. |
| RT8803AGQW | Richtek dual-output IMVP8 controller with identical 4+3 phase capability but different SMBus register map and no DCR NTC compensation support. | Requires revalidation of SVID command set and thermal compensation scheme in firmware. | Choose if existing Richtek ecosystem and toolchain alignment outweighs Renesas-specific features. |
Compared with ISL95866CIRZ-T, ISL95865CIRZ-T omits the second VR entirely - limiting use to core-only applications - while RT8803AGQW provides functional parity in phase count but requires firmware adaptation due to non-identical SMBus implementation and absence of NTC-based DCR compensation.
Availability
ISL95866CIRZ-T is available at Aetrix Electronics and suitable for desktop motherboard design, IMVP8-compliant CPU power delivery, and dual-rail graphics platform development requiring stable component supply and long-term lifecycle support.
Supply support for ISL95866CIRZ-T 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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and computing markets.
The ISL95866CIRZ-T belongs to Renesas' high-accuracy multiphase PWM controller product line, engineered specifically for Intel IMVP8-compliant desktop CPU power architectures requiring dual-rail SVID control, integrated gate drivers, and R3™ transient performance.
FAQ
What is the primary function of the ISL95866CIRZ-T in a desktop motherboard?
The ISL95866CIRZ-T serves as a dual-output IMVP8-compliant PWM controller regulating both CPU core (IA) and graphics (GT/GTUS) voltage rails. It manages up to four phases for the core rail and up to three for the graphics rail using integrated +12V gate drivers, SMBus-based SVID communication, and R3™ modulator technology to meet Intel's stringent transient and accuracy requirements. Its design enables compact, cost-effective dual-rail power delivery without discrete controllers.
Does the ISL95866CIRZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95866CIRZ-T supports both lossless inductor DCR current sensing - with optional NTC thermistor compensation for temperature drift - and precision shunt resistor sensing. This flexibility allows designers to optimize between cost (DCR) and accuracy (resistor), and both methods are fully supported per the FN8974 datasheet for both VR A and VR B outputs.
How does the R3™ modulator in the ISL95866CIRZ-T improve transient response?
The R3™ modulator in the ISL95866CIRZ-T achieves faster transient settling by dynamically adjusting switching frequency in response to load steps and employing predictive ripple-based control. Unlike fixed-frequency PWM, it minimizes output voltage deviation during rapid load changes - demonstrated in FN8974 as sub-10µs recovery - which is essential for meeting IMVP8 core rail transient specifications under real-world CPU workload shifts.
Can the ISL95866CIRZ-T be used in platforms requiring independent SVID addressing for multiple controllers?
Yes, the ISL95866CIRZ-T features resistor-programmable SVID addresses, allowing multiple instances on the same SMBus without address conflict. This is explicitly supported in the datasheet and enables multi-controller topologies - such as separate core and graphics controllers - while maintaining full SVID compatibility with Intel CPUs. Each ISL95866CIRZ-T can be assigned a unique address via external resistors.
What protection features are configurable via SMBus on the ISL95866CIRZ-T?
The ISL95866CIRZ-T allows SMBus-based enable/disable of overvoltage protection (OVP), overcurrent protection (OCP), and droop control. Voltage offset adjustment is also SMBus-programmable. These capabilities let system firmware dynamically adapt protection thresholds during debug, thermal throttling, or custom power states - all without hardware modification. The FN8974 datasheet confirms these functions are accessible via standard SVID commands.
ISL95866CIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 52-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
ISL95866CIRZ-T FAQ
1.How can I place an order for ISL95866CIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95866CIRZ-T 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 ISL95866CIRZ-T reliable?
The price and inventory of ISL95866CIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95866CIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL95866CIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95866CIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95866CIRZ-T?
ISL95866CIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95866CIRZ-T 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 ISL95866CIRZ-T?
For technical support, including ISL95866CIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95866CIRZ-T requirements.
6.How does Aetrix verify that ISL95866CIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95866CIRZ-T 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 ISL95866CIRZ-T meets industry standards.
7.What is the process for return or replacement of ISL95866CIRZ-T?
All ISL95866CIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95866CIRZ-T, 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 ISL95866CIRZ-T part is unused and in its original packaging.
Return procedure for ISL95866CIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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