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Renesas ISL95856IRZ-T
- Part No.:
- ISL95856IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- -
- Datasheet:
-
ISL95856IRZ-T.pdf
- Description:
- IC PWM CTLR 52QFN
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Product details
Overview
ISL95856IRZ-T from Renesas (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 on VR-A, one on VR-B), and implements R3™ modulator technology for fast transient response and diode emulation mode at light load.
For engineers reviewing the ISL95856IRZ-T datasheet, ISL95856IRZ-T pinout, ISL95856IRZ-T application, or ISL95856IRZ-T equivalent, key selection criteria include SVID-compliant serial bus interface, DCR/resistor current sensing flexibility, differential remote sensing per output, programmable IMAX and switching frequency, and phase-shedding support across PS0–PS2 power states.
Technical Context
The ISL95856IRZ-T implements a green hybrid digital R3™ modulator architecture with variable-frequency operation that dynamically adjusts switching frequency during load transients to optimize efficiency and settling time. It supports dual VR outputs sharing a common SMBus/PMBus/I²C interface with conflict-free SVID addressing, enabling coordinated CPU communication without separate control buses.
Each VR output features independent configuration: VR-A supports 4/3/2/1-phase operation with two integrated +12V gate drivers; VR-B supports 3/2/1-phase with one +12V gate driver. Both outputs provide resistor-programmable IMAX, adjustable switching frequency, OC protection, and a shared VR_READY signal.
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 - enables scalable power delivery for multi-rail processors |
| Voltage Accuracy | ±0.5% over temperature - ensures stable core/GT rail regulation under thermal stress |
| Modulator Type | R3™ (Robust Ripple Regulator) - enables faster transient settling and diode emulation in single-phase mode |
| Current Sensing | DCR-based (with single NTC thermistor compensation) or precision resistor-based - selectable per design requirements |
| Interface | SMBus/PMBus/I²C with SVID conflict-free addressing - allows coexistence of multiple controllers on same bus |
| Gate Drivers | Three integrated +12V drivers: two on VR-A, one on VR-B - eliminates need for external high-side drivers |
Pinout & Package
ISL95856IRZ-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 | +12V input for gate drivers and internal bias - requires local bulk and ceramic decoupling |
| VDD | Internal regulator input | +5V supply for logic and analog circuitry - derived from VIN via internal LDO |
| SCL/SCLB | I²C clock lines | Dual-clock capability for redundant or isolated bus segments - supports SMBus timeout recovery |
| SDA/SDAB | I²C data lines | Dual-data path enables fault-tolerant communication or parallel bus segmentation |
| VR_READY | Power-good indicator | Open-drain output signaling valid regulation on both VR-A and VR-B - active-high after sequencing |
| IMON_A / IMON_B | Current monitor outputs | Analog voltage proportional to sensed load current - used for telemetry and margining |
| PHASE_Ax / PHASE_Bx | Phase driver outputs | High-side gate drive signals (x=1–4 for VR-A; x=1–3 for VR-B) - directly drive external MOSFETs |
Key Features
| Feature | Design Value |
|---|---|
| Green hybrid R3™ modulator | Enables phase shedding across PS0–PS2 states and diode emulation in single-phase mode for >90% light-load efficiency |
| Dual VR with shared SVID bus | Reduces PCB area and BOM count vs. discrete dual-controller solutions while maintaining independent VR configuration |
| Differential remote sensing | Compensates for IR drop across PCB traces - maintains ±0.5% regulation accuracy at point-of-load |
| Programmable SVID address | Allows up to 8 unique addresses per bus - supports multi-VR systems without address conflict |
| Adaptive body diode conduction reduction | Minimizes shoot-through and reverse conduction losses during dead-time - improves thermal performance at high frequency |
Applications
| Desktop CPU Core Power Delivery | Desktop GPU Graphics Rail |
|---|---|
Use Scenario: High-performance desktop motherboard delivering regulated IA rail to Intel 4th–7th Gen Core processors. IC Role / Device Role / Timing Role: Primary multiphase PWM controller managing 4-phase VR-A with dynamic phase shedding and SVID-based voltage scaling. Use Value: Achieves <0.5% voltage error across -10°C to +105°C ambient, enabling stable overclocking and thermal throttling compliance. | Use Scenario: Dual-rail ATX motherboard supplying GT rail to integrated Intel HD Graphics or discrete GPU companion power stage. IC Role / Device Role / Timing Role: Secondary VR-B controller configured for 3-phase operation, synchronized to VR-A via shared SVID bus. Use Value: Enables independent voltage/frequency scaling of GT rail while sharing bus resources - reduces component count by one full controller IC. |
| IMVP8™ Reference Design Platform | High-Density Mini-ITX Workstation |
Use Scenario: Intel-validated reference board implementing full IMVP8™ compliance including VR sequencing, telemetry, and protection. IC Role / Device Role / Timing Role: Dual-output controller executing precise SVID command parsing, VR_READY assertion timing, and OC/UVLO fault reporting. Use Value: Meets Intel's VR_READY setup/hold timing and voltage monotonicity requirements - accelerates platform validation. | Use Scenario: Space-constrained mini-ITX workstation requiring high-efficiency, low-thermal-footprint CPU power solution. IC Role / Device Role / Timing Role: Compact 48-pin QFN controller enabling 4+3 phase delivery with integrated gate drivers and thermal pad for direct heatsink attachment. Use Value: Eliminates four external gate drivers and associated layout area - reduces total VR solution footprint by ~25% vs. discrete driver approach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855IRZ-T | Single-output (4-phase only), no VR-B channel or second gate driver - lacks dual-rail support | Only suitable for IA-rail-only designs; cannot replace ISL95856IRZ-T in GT-rail or dual-VR systems | Select when only core rail regulation is required and board space permits separate GT rail controller |
| RT8803AZQW | Supports IMVP8™ but uses analog current-mode control instead of R3™ digital modulation - slower transient response, no diode emulation | Lower cost alternative where light-load efficiency and sub-10µs transient recovery are not critical | Prefer for budget-sensitive mainstream desktops where IMVP8™ compliance is mandatory but advanced R3™ features are optional |
Compared with ISL95856IRZ-T, ISL95855IRZ-T omits GT-rail capability entirely, while RT8803AZQW trades R3™'s adaptive frequency and diode emulation for simpler analog control - making ISL95856IRZ-T the only option supporting simultaneous high-accuracy, high-efficiency, dual-rail IMVP8™ compliance in a single IC.
Availability
ISL95856IRZ-T is available at Aetrix Electronics and suitable for high-performance desktop motherboards, IMVP8™ reference platforms, and compact workstation power designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ISL95856IRZ-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 acquired Intersil in 2017 and continues to manufacture, test, and support its high-performance analog and power management portfolio under ISO 9001 quality systems.
The ISL95856IRZ-T belongs to Renesas' IMVP8™-compliant multiphase controller product line, engineered specifically for energy-efficient, high-accuracy dual-rail CPU power delivery in desktop computing platforms.
FAQ
What is the primary function of the ISL95856IRZ-T in a desktop motherboard?
The ISL95856IRZ-T serves as a dual-output multiphase PWM controller for Intel IMVP8™-compliant desktop CPUs, regulating both the core (IA) and graphics (GT) voltage rails. It manages up to 4 phases on VR-A and 3 phases on VR-B using integrated +12V gate drivers and a shared SVID interface. The ISL95856IRZ-T enables precise voltage scaling, phase shedding, and fast transient response required by modern Intel processors.
Does the ISL95856IRZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95856IRZ-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 DCR variation is unacceptable. Both methods are configurable per VR output, and the ISL95856IRZ-T provides dedicated IMON_A and IMON_B analog monitor outputs for each sensing path.
How does the R3™ modulator in the ISL95856IRZ-T improve light-load efficiency?
The R3™ modulator in the ISL95856IRZ-T enables diode emulation mode during light-load conditions, reducing switching frequency in single-phase operation to minimize switching losses. This feature, combined with adaptive body diode conduction time reduction, achieves >90% efficiency at 10% load. The ISL95856IRZ-T sustains this behavior across PS0–PS2 power states without external intervention.
Can the ISL95856IRZ-T be used in non-Intel platforms?
The ISL95856IRZ-T is specifically designed for Intel IMVP8™ compliance and relies on SVID protocol commands for voltage setting, margining, and telemetry. While its PWM architecture is technically adaptable, it lacks generic PMBus command support or user-configurable VID tables. Therefore, the ISL95856IRZ-T is not recommended for AMD, ARM, or custom processor platforms unless SVID emulation is implemented externally.
What package type and thermal characteristics does the ISL95856IRZ-T use?
The ISL95856IRZ-T uses a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad for enhanced heat dissipation. Its thermal resistance θJA is 30°C/W typical when mounted on a 4-layer board with 1-in² copper pour under the pad. The ISL95856IRZ-T includes thermal shutdown protection and supports junction temperatures from -40°C to +125°C.
ISL95856IRZ-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:
- -
ISL95856IRZ-T FAQ
1.How can I place an order for ISL95856IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95856IRZ-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 ISL95856IRZ-T reliable?
The price and inventory of ISL95856IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95856IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL95856IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95856IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95856IRZ-T?
ISL95856IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95856IRZ-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 ISL95856IRZ-T?
For technical support, including ISL95856IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95856IRZ-T requirements.
6.How does Aetrix verify that ISL95856IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95856IRZ-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 ISL95856IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL95856IRZ-T?
All ISL95856IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95856IRZ-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 ISL95856IRZ-T part is unused and in its original packaging.
Return procedure for ISL95856IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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