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Renesas ISL95855AIRTZ
- Part No.:
- ISL95855AIRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95855AIRTZ.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:169
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Product details
Overview
ISL95855AIRTZ from Renesas (formerly Intersil) is a 3+2+1-phase IMVP8™ CPU voltage regulator controller for Intel microprocessors, delivering precise core (VR A), graphics (VR B), and system agent (VR C) rail regulation with 0.5% system accuracy over temperature, R3™ modulator technology, and support for DCR/resistor current sensing. It enables compact, cost-effective power delivery in ultrabooks and thin notebooks.
For engineers reviewing the ISL95855AIRTZ datasheet, ISL95855AIRTZ pinout, ISL95855AIRTZ application, or ISL95855AIRTZ equivalent, key selection factors include IMVP8™ PS4 compliance, programmable SVID address and VBOOT, differential remote sensing, and compatibility with DrMOS or discrete power stages using ISL95808 drivers.
Technical Context
The ISL95855AIRTZ implements a Robust Ripple Regulator (R3™) modulator architecture enabling variable switching frequency during load transients, faster transient settling, and diode-emulation mode for improved light-load efficiency. It integrates a shared serial control bus compliant with Intel SVID for coordinated VR A/B/C communication with the CPU.
All three outputs support programmable IMAX, adjustable slew rate and switching frequency, OC protection, and a unified VR_READY signal. Current sensing is configurable via lossless DCR (with single NTC thermistor compensation) or precision resistor-based methods, and remote voltage sense is differential across each rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IMVP8™ Compliance | Fully supports PS4 entry/exit, system input power monitor (PSYS), and SVID interface timing requirements for Intel CPUs. |
| Output Configuration | VR A: 3-/2-/1-phase; VR B: 2-/1-phase; VR C: 1-phase - enables flexible rail partitioning per CPU power domain. |
| System Accuracy | ±0.5% over temperature - ensures stable core/graphic/SA voltages under thermal stress without recalibration. |
| Current Sensing | DCR sensing with NTC compensation or external resistor sensing - allows board-level optimization of cost vs. precision. |
| R3™ Modulator | Variable-frequency operation + diode emulation - reduces light-load power loss and improves transient response vs. fixed-frequency PWM. |
| Voltage Range | 0.80V–0.91V output (per Figure 1 load line) - matches IMVP8™ CPU core rail specifications at up to 66A total IOUT. |
Pinout & Package
ISL95855AIRTZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per Intersil FN8820 Rev.0.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVID_DATA / SVID_CLK | SVID serial interface | Bi-directional CPU-to-controller communication for VR configuration, telemetry, and PS4 state coordination. |
| VR_Ax_PWM / VR_Bx_PWM / VR_Cx_PWM | PWM outputs (x = 1–3) | Phase-specific gate drive signals supporting DrMOS or discrete high-side/low-side FETs. |
| VSNSA+/VSNSA− / VSNSB+/VSNSB− / VSNSC+/VSNSC− | Differential remote sense inputs | Enables accurate voltage regulation at CPU pads by rejecting PCB IR drop on high-current paths. |
| ISENA/ISENB/ISENC | Current sense inputs | Accepts DCR voltage drop or resistor shunt voltage for real-time phase current monitoring and protection. |
| VR_READY | Power-good indicator | Single open-drain output signaling valid regulation across all three VR rails simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable SVID Address | Resistor-selectable address allows multiple ISL95855AIRTZ controllers on same SVID bus without conflict. |
| VBOOT Programmability | Adjustable boot voltage prevents inrush and ensures controlled startup sequence for sensitive CPU cores. |
| Adaptive Body Diode Conduction Reduction | Minimizes reverse conduction loss in low-side FETs during light-load diode emulation mode. |
| PSYS Monitoring Support | Enables system-level input power reporting to CPU for thermal/power budgeting in mobile platforms. |
| Shared Serial Control Bus | Reduces PCB routing complexity and component count versus discrete dual-controller solutions. |
Applications
| Ultrabook Core Power Delivery | Notebook Graphics Rail Regulation |
|---|---|
Use Scenario: High-density motherboard powering Intel Core i7 CPU with dynamic phase shedding across VR A (core), VR B (graphics), and VR C (system agent). IC Role / Device Role / Timing Role: Primary IMVP8™ controller managing all three SVID-regulated rails with synchronized PS4 state transitions. Use Value: 0.5% system accuracy and R3™ transient response ensure stable operation during rapid CPU turbo boost events. | Use Scenario: Thin-and-light notebook requiring independent graphics rail control while sharing SVID bus with core controller. IC Role / Device Role / Timing Role: VR B output configured as 2-phase regulator for GPU voltage, coordinated via shared SVID interface. Use Value: Resistor-programmable IMAX and slew rate allow fine-tuning for GPU-specific load step requirements. |
| Desktop IMVP8™ Platform Power | Tablet System Agent Supply |
Use Scenario: Compact desktop motherboard implementing IMVP8™ compliance with discrete MOSFET power stages driven by ISL95808. IC Role / Device Role / Timing Role: Controller providing PWM outputs and DCR current sensing for all three rails using external high-voltage drivers. Use Value: Differential remote sensing compensates for PCB trace resistance, maintaining ±0.5% accuracy at CPU socket. | Use Scenario: Fanless tablet platform requiring ultra-low quiescent current in PS4 deep-sleep state. IC Role / Device Role / Timing Role: VR C output supplies system agent at 0.85V with programmable VBOOT and low PS4 supply current. Use Value: Enables extended battery life via PS4 entry/exit support and adaptive body diode reduction in light-load mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase CPU voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855IRTZ | Same die, identical electrical specs, but lacks IMVP8™ PS4 compliance documentation in public datasheet revision. | Not validated for PS4 entry/exit or PSYS monitoring in IMVP8™-certified designs. | Select ISL95855AIRTZ when full IMVP8™ PS4 compliance and system power monitoring are required. |
| RT8803AGQW | 3+2+1-phase controller with IMVP8™ support; uses different modulator architecture and lacks R3™ variable-frequency capability. | Higher light-load quiescent current; no adaptive body diode conduction reduction feature. | Choose ISL95855AIRTZ for superior transient response and efficiency in battery-sensitive ultrabook platforms. |
Compared with ISL95855IRTZ and RT8803AGQW, the ISL95855AIRTZ uniquely combines verified IMVP8™ PS4 compliance, R3™ modulator benefits, and integrated PSYS monitoring - making it the only option qualified for next-generation Intel ultrabook reference designs requiring full specification adherence.
Availability
ISL95855AIRTZ is available at Aetrix Electronics and suitable for ultrabooks, thin notebooks, and IMVP8™-compliant desktop motherboards requiring stable component supply, long-term lifecycle support, and full PS4 power domain compliance.
Supply support for ISL95855AIRTZ 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 maintains its high-performance analog and power management portfolio for computing, industrial, and automotive markets.
The ISL95855AIRTZ belongs to Renesas' IMVP8™-optimized CPU power controller product line, designed specifically to meet Intel's stringent PS4, load-line, and telemetry requirements for mobile and desktop client platforms.
FAQ
What is the primary function of the ISL95855AIRTZ in an Intel CPU power system?
The ISL95855AIRTZ serves as the main 3+2+1-phase IMVP8™ voltage regulator controller, regulating core (VR A), graphics (VR B), and system agent (VR C) rails with synchronized SVID communication. It delivers ±0.5% system accuracy, supports PS4 power states, and enables compact power delivery in ultrabooks and notebooks - all critical for reliable ISL95855AIRTZ deployment in Intel client platforms.
Does the ISL95855AIRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95855AIRTZ supports two current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for cost-sensitive designs, and precision external resistor sensing for higher accuracy. Both methods are fully supported across all three VR outputs and are selectable at design time - a key flexibility point confirmed in the ISL95855AIRTZ datasheet.
How does the R3™ modulator in the ISL95855AIRTZ improve performance over traditional PWM controllers?
The R3™ modulator in the ISL95855AIRTZ provides variable switching frequency during load transients, faster transient settling time, and diode-emulation mode with load-dependent low switching frequency for improved light-load efficiency. These features directly enhance CPU responsiveness and battery life - distinguishing the ISL95855AIRTZ from fixed-frequency alternatives in real-world ultrabook use cases.
Is the ISL95855AIRTZ pin-compatible with the ISL95855IRTZ?
No, the ISL95855AIRTZ is not guaranteed pin-compatible with the ISL95855IRTZ. While both share the same 48-pin QFN package and pinout layout, the ISL95855AIRTZ includes IMVP8™ PS4-specific functionality and firmware validation absent in the ISL95855IRTZ. Designers must verify SVID timing, PSYS support, and PS4 state behavior before substitution - ISL95855AIRTZ remains the only version qualified for full IMVP8™ compliance.
What role does the VR_READY signal play in systems using the ISL95855AIRTZ?
The VR_READY signal is a single open-drain power-good indicator that asserts only when all three regulated outputs (VR A, VR B, VR C) meet their respective voltage and timing specifications. This unified status simplifies motherboard power sequencing logic and ensures safe CPU initialization - a critical reliability feature built into the ISL95855AIRTZ architecture.
ISL95855AIRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Controller, Intel IMVP8
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 3
- Voltage - Output:
- 0V ~ 1.52V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFN (6x6)
ISL95855AIRTZ FAQ
1.How can I place an order for ISL95855AIRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95855AIRTZ 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 ISL95855AIRTZ reliable?
The price and inventory of ISL95855AIRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95855AIRTZ is usually 5 days.
3.What payment methods are accepted for ISL95855AIRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95855AIRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95855AIRTZ?
ISL95855AIRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95855AIRTZ 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 ISL95855AIRTZ?
For technical support, including ISL95855AIRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95855AIRTZ requirements.
6.How does Aetrix verify that ISL95855AIRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95855AIRTZ 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 ISL95855AIRTZ meets industry standards.
7.What is the process for return or replacement of ISL95855AIRTZ?
All ISL95855AIRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95855AIRTZ, 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 ISL95855AIRTZ part is unused and in its original packaging.
Return procedure for ISL95855AIRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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