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Renesas ISL95856HRZ-T
- Part No.:
- ISL95856HRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
ISL95856HRZ-T.pdf
- Description:
- IC PWM CTLR 52QFN
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Product details
Overview
ISL95856HRZ-T from Renesas Electronics (formerly Intersil) is a dual-output, multiphase PWM controller for Intel IMVP8™ desktop CPUs, supporting 4+3 phase configurations across two independent VRs. It delivers 0.5% system voltage accuracy over temperature, integrates three +12V gate drivers (two for VR-A, one for VR-B), and implements R3™ modulator technology with diode emulation for high light-load efficiency.
For engineers reviewing the ISL95856HRZ-T datasheet, ISL95856HRZ-T pinout, ISL95856HRZ-T application, or ISL95856HRZ-T equivalent, key selection criteria include SVID-compliant serial interface support, DCR/resistor current sensing flexibility, differential remote sensing per output, programmable IMAX and switching frequency, and phase-shedding capability across PS0–PS2 power states.
Technical Context
The ISL95856HRZ-T implements a green hybrid digital R3™ modulator architecture enabling variable-frequency operation during load transients and diode emulation in single-phase mode. It supports two independent VR outputs: 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 outputs share a common SMBus/PMBus/I²C-compatible SVID interface with conflict-free addressing, enabling coordinated CPU communication while reducing board area versus dual-chip solutions. Current sensing is supported via lossless DCR with single NTC thermistor compensation or precision resistor-based methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Compliance | Intel IMVP8™ specification compliant for desktop CPU core (IA) and graphics (GT) rails |
| Output Configuration | Dual VR: VR-A (4/3/2/1-phase), VR-B (3/2/1-phase); shared SVID bus reduces interconnect count |
| Voltage Accuracy | ±0.5% system accuracy over full temperature range ensures stable CPU/GPU rail regulation |
| Modulator Type | R3™ Robust Ripple Regulator enables faster transient settling and load-dependent frequency scaling |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and precision resistor sensing per output |
| Gate Drivers | Three integrated +12V drivers: two on VR-A, one on VR-B - eliminates external driver ICs |
| Protection Features | OC protection, programmable IMAX, remote voltage sense, and single VR_READY power-good indicator |
Pinout & Package
ISL95856HRZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95856 datasheet Rev 2.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts +12V input to power internal circuitry and gate drivers |
| VDDA | Analog supply | Provides regulated analog supply for precision reference and sensing circuits |
| SVID_DATA / SVID_CLK | SVID interface signals | Two-wire bidirectional bus for CPU communication and VR configuration |
| VR_A_SENSE+/–, VR_B_SENSE+/– | Differential remote sense inputs | Enable accurate load-point voltage regulation by compensating for PCB IR drop |
| IMON_A / IMON_B | Current monitor outputs | Analog current feedback signals for real-time load monitoring and protection |
| PGOOD | Power-good indicator | Open-drain signal asserting VR_READY status for system power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| R3™ modulator with diode emulation | Enables high efficiency at light loads by disabling synchronous rectification and emulating body diode conduction |
| Programmable SVID address | Allows coexistence of multiple ISL95856HRZ-T controllers on same SVID bus without address conflict |
| Phase shedding across PS0–PS2 | Reduces active phase count under low load to minimize switching losses and improve efficiency |
| Dual VR with shared SVID | Eliminates need for second SVID interface, saving PCB space and simplifying firmware integration |
| Adaptive body diode conduction time reduction | Minimizes reverse recovery losses in high-side MOSFETs during light-load transitions |
Applications
| Desktop CPU Core Power Delivery | Desktop GPU Graphics Rail |
|---|---|
Use Scenario: High-performance desktop motherboard powering Intel 4th–7th Gen Core processors requiring IMVP8-compliant IA rail regulation. IC Role / Device Role / Timing Role: Primary multiphase PWM controller managing up to 4-phase core voltage with dynamic phase shedding and precise SVID-controlled voltage scaling. Use Value: Delivers ±0.5% voltage accuracy and fast transient response essential for maintaining CPU stability during turbo boost events. | Use Scenario: Dual-rail motherboard design supplying independent GT rail to integrated or discrete GPU logic on LGA115x platforms. IC Role / Device Role / Timing Role: Secondary VR controller operating in 3-phase mode, sharing SVID bus with core VR to reduce BOM and layout complexity. Use Value: Enables synchronized voltage sequencing and coordinated power-state transitions between IA and GT domains. |
| IMVP8 Reference Design Platform | High-Efficiency ATX Power Solution |
Use Scenario: Intel-validated reference motherboard used by OEMs for rapid qualification of new desktop SKUs. IC Role / Device Role / Timing Role: Dual-output controller implementing IMVP8 timing requirements including VR_HOT, VR_READY, and SVID command latency compliance. Use Value: Reduces design validation time by providing pre-characterized R3™ modulator behavior and SVID register map alignment. | Use Scenario: Energy-efficient ATX PSU companion IC delivering tight regulation for next-gen compact desktop systems. IC Role / Device Role / Timing Role: Multiphase controller leveraging diode emulation and phase shedding to maintain >90% efficiency at 10% load. Use Value: Meets 80 PLUS Titanium efficiency targets for light-load operation without auxiliary LDOs or secondary controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855HRZ-T | Single-output (4+3-phase) variant without VR-B; lacks second SVID-configurable VR channel | Only suitable for single-rail (IA-only) IMVP8 designs; cannot support GT rail | Select when only core rail regulation is required and board space is constrained |
| RT8803AZQW | Supports IMVP9 but not IMVP8; uses different SVID command set and phase control logic | Designed for 8th Gen+ Intel CPUs; requires firmware rework for IMVP8 compatibility | Choose for future-proofing beyond IMVP8, but not as drop-in replacement |
Compared with ISL95856HRZ-T, ISL95855HRZ-T omits VR-B functionality and reduces pin count, while RT8803AZQW targets newer IMVP9 specifications and introduces incompatible SVID timing - neither offers pin-to-pin or functional equivalence without hardware/firmware revision.
Availability
ISL95856HRZ-T is available at Aetrix Electronics and suitable for desktop CPU core power delivery, GPU graphics rail regulation, and IMVP8-compliant reference platform development requiring stable component supply and long-term lifecycle support.
Supply support for ISL95856HRZ-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, formed through the acquisition of Intersil in 2017, designs high-performance analog and power management ICs for computing, industrial, and automotive markets.
The ISL95856HRZ-T belongs to Renesas' IMVP8-compliant multiphase controller product line, engineered specifically for high-efficiency, tightly regulated dual-rail power delivery in Intel desktop platforms.
FAQ
What is the primary function of the ISL95856HRZ-T in a desktop motherboard?
The ISL95856HRZ-T serves as a dual-output multiphase PWM controller for Intel IMVP8™ desktop CPUs, regulating both the core (IA) and graphics (GT) voltage rails. It manages up to 4 phases for VR-A and 3 phases for VR-B using integrated +12V gate drivers and a shared SVID interface. Its R3™ modulator ensures fast transient response and high light-load efficiency, making ISL95856HRZ-T critical for stable CPU/GPU operation under dynamic workloads.
Does the ISL95856HRZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95856HRZ-T supports two current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for temperature drift correction, and precision resistor-based sensing for higher accuracy where board space allows. Both methods are independently configurable per VR output, and ISL95856HRZ-T provides dedicated IMON outputs for real-time current monitoring on each rail.
How does the R3™ modulator in the ISL95856HRZ-T improve transient performance?
The R3™ modulator in ISL95856HRZ-T enables variable switching frequency during load transients, allowing faster response to sudden current changes without fixed-frequency loop limitations. It also supports diode emulation in single-phase mode to reduce switching losses at light loads. These features collectively deliver faster transient settling time and improved efficiency across the full load range compared to conventional constant-frequency modulators used in ISL95856HRZ-T's predecessor generations.
Can the ISL95856HRZ-T be used in IMVP9-compliant systems?
No, the ISL95856HRZ-T is specifically designed and validated for Intel IMVP8™ compliance and does not meet IMVP9 timing, command set, or SVID protocol requirements. While some electrical parameters may overlap, ISL95856HRZ-T lacks support for IMVP9-specific features such as adaptive voltage positioning enhancements and updated power state definitions. For IMVP9, Renesas recommends RT8803AZQW or similar successors.
What package type and thermal characteristics does the ISL95856HRZ-T use?
The ISL95856HRZ-T is packaged in a 48-pin QFN (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad for enhanced heat dissipation. Its thermal resistance (θJA) is specified at 30°C/W under standard JEDEC conditions. The package supports reflow soldering per IPC/JEDEC J-STD-020 and is rated for operation from –40°C to +105°C ambient, making ISL95856HRZ-T suitable for high-power density desktop VRM designs.
ISL95856HRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- -
- Voltage - Input:
- -
- Number of Outputs:
- -
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ISL95856HRZ-T FAQ
1.How can I place an order for ISL95856HRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95856HRZ-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 ISL95856HRZ-T reliable?
The price and inventory of ISL95856HRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95856HRZ-T is usually 5 days.
3.What payment methods are accepted for ISL95856HRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95856HRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95856HRZ-T?
ISL95856HRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95856HRZ-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 ISL95856HRZ-T?
For technical support, including ISL95856HRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95856HRZ-T requirements.
6.How does Aetrix verify that ISL95856HRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95856HRZ-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 ISL95856HRZ-T meets industry standards.
7.What is the process for return or replacement of ISL95856HRZ-T?
All ISL95856HRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95856HRZ-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 ISL95856HRZ-T part is unused and in its original packaging.
Return procedure for ISL95856HRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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