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Renesas ISL95866CIRZ
- Part No.:
- ISL95866CIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
ISL95866CIRZ.pdf
- Description:
- IC REG IMVP8 DESKTOP 2OUT 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
ISL95866CIRZ 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 (two on VR A, one on VR B), SMBus interface, and R3™ modulator technology for fast transient response and diode emulation mode at light load. It targets core (IA) and graphics (GT/GTUS) voltage regulation in high-performance desktop platforms.
For engineers reviewing the ISL95866CIRZ datasheet, ISL95866CIRZ pinout, ISL95866CIRZ application, or ISL95866CIRZ equivalent, key selection considerations include IMVP8 compliance, dual-VR SVID address programmability, DCR/resistor current sensing support, remote voltage sensing per output, and configurable droop/OVP/OCP via SMBus.
Technical Context
The ISL95866CIRZ implements Intersil's Robust Ripple Regulator R3™ architecture, enabling variable switching frequency during load transients and diode emulation mode for improved light-load efficiency. It supports two independent voltage regulators sharing a common SVID-compliant SMBus interface to the CPU.
Each VR features resistor-programmable IMAX, switching frequency, and SVID address; both use differential remote sensing and offer OC protection with a shared VR_READY signal. Current sensing supports lossless DCR with single NTC thermistor compensation or precision resistor-based methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IMVP8 Compliance | Fully compliant with Intel IMVP8 specification for desktop microprocessors including IA, GT, and GTUS power domains. |
| Output Configuration | Dual VR: VR A supports 4/3/2/1-phase; VR B supports 3/2/1-phase - enables flexible core+graphics power partitioning. |
| Gate Drivers | Three integrated +12V drivers: two dedicated to VR A, one to VR B - eliminates need for external high-side drivers. |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and precision resistor sensing - allows trade-off between cost and accuracy. |
| System Accuracy | ±0.5% over temperature - ensures tight voltage regulation across operating range for CPU stability. |
| SMBus Interface | SVID-compatible with conflict-free addressing - enables dynamic voltage offset, droop enable/disable, and OVP/OCP control from CPU. |
| Modulator Technology | R3™ modulator with phase shedding and load-dependent frequency scaling - delivers fast transient settling and high light-load efficiency. |
Pinout & Package
ISL95866CIRZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official Renesas datasheet FN8974.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts +12V input for gate drivers and internal circuitry; requires local decoupling. |
| VDD | Internal LDO Input | Supplies internal logic and analog blocks; typically tied to +5V or regulated +3.3V. |
| PHASEA1–PHASEA4 | VR A Phase Outputs | Drive external high-side MOSFETs for up to four phases of VR A; each supports gate drive timing control. |
| PHASEB1–PHASEB3 | VR B Phase Outputs | Drive external high-side MOSFETs for up to three phases of VR B; synchronized with VR A via internal timing logic. |
| SVID0–SVID4 | SMBus Data/Address Lines | Implement SVID bus interface (clock, data, address select); support conflict-free multi-controller systems. |
| VR_READY | Power-Good Indicator | Open-drain output signaling valid regulation on both VRs; used by CPU for power sequencing validation. |
| ISEN_A / ISEN_B | Current Sense Inputs | Differential inputs for DCR or resistor-based current sensing per VR; enable accurate load-line and OC protection. |
| VSEN_A / VSEN_B | Remote Voltage Sense | Differential inputs for remote point-of-load sensing - compensates for PCB IR drop on each VR output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual VR with Independent Configuration | VR A and VR B can be set to different phase counts (e.g., 4+3, 3+2) and IMAX values - matches asymmetric CPU/GPU power demands. |
| R3™ Modulator with Diode Emulation | Enables single-phase operation at light load with reduced switching frequency - improves efficiency below 10% load without external control. |
| Programmable SVID Address | Resistor-selectable address per VR - allows coexistence of multiple ISL95866CIRZ controllers on same SMBus without conflict. |
| Integrated Gate Drivers | Three +12V drivers eliminate discrete driver ICs and reduce layout complexity - lowers BOM count and board area. |
| SMBus-Controlled Protection | OVP, OCP, and droop can be dynamically enabled/disabled via SVID commands - supports adaptive CPU power management policies. |
Applications
| Desktop CPU Core Regulation | Discrete GPU Voltage Regulation |
|---|---|
Use Scenario: Regulating core voltage (IA) for Intel 8th/9th Gen desktop CPUs (CFL/CNL) with dynamic load steps up to 100A/µs. IC Role / Device Role / Timing Role: Primary IMVP8-compliant PWM controller managing up to 4-phase buck conversion with real-time SVID communication to CPU. Use Value: ±0.5% system accuracy and R3™ fast transient response ensure stable core voltage during turbo boost and AVX workloads. | Use Scenario: Providing dedicated graphics rail (GTUS/GTX) for discrete GPUs paired with IMVP8 CPUs in high-end gaming or workstation motherboards. IC Role / Device Role / Timing Role: Secondary VR controller configured for 3-phase operation, sharing SMBus with VR A to minimize interconnect count. Use Value: Integrated gate driver and remote sensing maintain <1% voltage deviation at GPU load points up to 60A. |
| Multi-SKU Motherboard Platform | Energy-Efficient Light-Load Operation |
Use Scenario: Enabling single motherboard design supporting multiple CPU SKUs (e.g., i5/i7/i9) with varying phase and IMAX requirements. IC Role / Device Role / Timing Role: Dual-VR controller with resistor-programmable SVID address, IMAX, and frequency - allows BIOS-configurable VR settings per SKU. Use Value: Reduces platform validation effort and inventory complexity while maintaining IMVP8 compliance across all variants. | 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 automatically enters diode emulation mode and reduces switching frequency in single-phase operation. Use Value: Achieves >85% efficiency at 5A load (VR A) and >80% at 3A load (VR B), reducing system standby power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output IMVP8 desktop CPU regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95865CIRZ | Single-output version (4-phase only); lacks VR B channel and second SMBus interface block. | Only suitable for CPU-core-only designs without dedicated GT/GTUS rail. | Select when only one VR is required and board space or cost constraints preclude dual-VR implementation. |
| RT8803AZQW | Monolithic dual-VR controller with integrated MOSFETs (no external drivers needed); lower pin count but fixed 4+3 phase configuration. | Better suited for compact mATX or ITX boards where layout area is critical and thermal design permits integrated FETs. | Choose when minimizing external components and simplifying layout outweighs flexibility in phase count and driver selection. |
Compared with ISL95866CIRZ, ISL95865CIRZ omits the second VR entirely - limiting it to core-only regulation - while RT8803AZQW integrates power stages but sacrifices configurability in phase count, current sensing method, and SVID address programming.
Availability
ISL95866CIRZ is available at Aetrix Electronics and suitable for high-performance desktop motherboard design, IMVP8-compliant CPU power delivery, and discrete GPU voltage regulation requiring stable component supply and long-term lifecycle support.
Supply support for ISL95866CIRZ 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 trusted embedded solutions, with expertise in power management, microcontrollers, and analog ICs for computing, industrial, and automotive markets.
The ISL95866CIRZ belongs to Renesas' high-accuracy multiphase PWM controller product line, designed specifically to meet Intel IMVP8 specifications for desktop CPU core and graphics voltage regulation with flexible configuration and SMBus intelligence.
FAQ
What is the primary function of the ISL95866CIRZ in a desktop motherboard?
The ISL95866CIRZ serves as a dual-output IMVP8-compliant PWM controller regulating both CPU core (IA) and graphics (GT/GTUS) voltages. It manages up to four phases for VR A and three for VR B, integrates +12V gate drivers, and communicates with the CPU via SMBus. Its R3™ modulator ensures fast transient response and high light-load efficiency - making ISL95866CIRZ essential for stable, efficient power delivery in modern desktop platforms.
Does the ISL95866CIRZ support both DCR and resistor-based current sensing?
Yes, the ISL95866CIRZ supports both lossless inductor DCR current sensing - with optional single NTC thermistor for temperature compensation - and precision resistor-based current sensing. This dual-sensing capability allows designers to optimize for cost (DCR) or accuracy (resistor), and both methods are fully supported on both VR A and VR B outputs in the ISL95866CIRZ.
Can the ISL95866CIRZ be used in systems requiring multiple controllers on the same SMBus?
Yes, the ISL95866CIRZ features resistor-programmable SVID addresses for both VR A and VR B, enabling conflict-free operation alongside other SVID-compliant controllers on the same SMBus. This capability is explicitly documented in the FN8974 datasheet and makes ISL95866CIRZ suitable for complex multi-rail platforms where multiple voltage regulators must coexist without bus arbitration issues.
What is the significance of the R3™ modulator in the ISL95866CIRZ?
The R3™ modulator in the ISL95866CIRZ provides variable switching frequency during load transients, faster transient settling time versus traditional modulators, and diode emulation mode at light load to improve efficiency. These characteristics directly enhance CPU voltage stability during turbo bursts and reduce idle power - key performance attributes confirmed in ISL95866CIRZ application testing and efficiency curves in the official datasheet.
Is the ISL95866CIRZ pin-compatible with earlier ISL958xx series controllers?
No, the ISL95866CIRZ is not pin-compatible with prior ISL958xx controllers such as ISL95838 or ISL95858. It uses a unique 48-pin QFN package with distinct pin assignments for PHASE outputs, SVID lines, and sensing inputs. The datasheet FN8974 confirms this layout as specific to the ISL95866CIRZ, and migration requires PCB redesign - confirming that ISL95866CIRZ is a new-generation IMVP8 solution rather than a drop-in upgrade.
ISL95866CIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- 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)
ISL95866CIRZ FAQ
1.How can I place an order for ISL95866CIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95866CIRZ 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 reliable?
The price and inventory of ISL95866CIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95866CIRZ is usually 5 days.
3.What payment methods are accepted for ISL95866CIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95866CIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95866CIRZ?
ISL95866CIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95866CIRZ 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?
For technical support, including ISL95866CIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95866CIRZ requirements.
6.How does Aetrix verify that ISL95866CIRZ is sourced from the original manufacturer or authorized distributors?
All ISL95866CIRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL95866CIRZ?
All ISL95866CIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95866CIRZ, 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 part is unused and in its original packaging.
Return procedure for ISL95866CIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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