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Renesas ISL95855AIRTZ-T
- Part No.:
- ISL95855AIRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95855AIRTZ-T.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
ISL95855AIRTZ-T from Renesas (formerly Intersil) is a 3+2+1-phase IMVP8™ CPU voltage regulator controller IC for Intel microprocessors, delivering 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-T datasheet, ISL95855AIRTZ-T pinout, ISL95855AIRTZ-T application, or ISL95855AIRTZ-T equivalent, key selection criteria include IMVP8™ PS4 compliance, programmable SVID address, VR phase configurability (3/2/1 for VR A; 2/1 for VR B; 1 for VR C), remote voltage sense, and PSYS input power monitoring capability.
Technical Context
The ISL95855AIRTZ-T implements a Robust Ripple Regulator (R3™) modulator architecture enabling variable switching frequency during load transients, diode emulation mode for improved light-load efficiency, and adaptive body diode conduction time reduction. It integrates three independent VR controllers sharing a common SVID serial bus for CPU communication.
All three outputs support differential remote voltage sensing, programmable IMAX, adjustable switching frequency, overcurrent protection, and a unified VR_READY signal. Current sensing is configurable via lossless DCR (with single NTC thermistor compensation) or precision resistor-based methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Standard | Compliant with Intel IMVP8™ specification including full PS4 entry/exit support. |
| Output Configuration | Three independent VRs: VR A (3/2/1-phase), VR B (2/1-phase), VR C (1-phase); all share one SVID bus. |
| System Accuracy | ±0.5% over temperature - ensures tight VOUT tolerance for CPU core, graphics, and SA rails. |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and resistor-based sensing for design flexibility and precision. |
| Modulator Type | R3™ (Robust Ripple Regulator) - enables faster transient response and variable-frequency operation under load change. |
| Voltage Sense | Differential remote sensing on all three VR outputs - eliminates PCB trace IR drop errors. |
| Power-Good Signal | Single VR_READY indicator for all three outputs - simplifies system power sequencing logic. |
Pinout & Package
ISL95855AIRTZ-T is housed in a 40-pin QFN package (6mm × 6mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95855A datasheet (FN8820 Rev.0.00).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVID_DATA / SVID_CLK | SVID serial interface | Two-wire bidirectional bus for CPU communication; supports PS4 state transitions and telemetry. |
| PSYS | System input power monitor input | Analog input for measuring total system input power; enables dynamic power budgeting per IMVP8™. |
| VR_Ax, VR_Bx, VR_Cx | PWM outputs (x = 1–3 for VR A; 1–2 for VR B; 1 for VR C) | Drive external DrMOS or discrete buck stages; phase count configurable per VR. |
| VSNS_A/B/C, VFB_A/B/C | Remote voltage sense inputs | Differential pairs for precise feedback at CPU VRIN pins - compensates for PCB IR drop. |
| IMON_A/B/C | Current sense inputs | Accepts DCR-derived or resistor-derived current signals for per-rail OCP and load-line programming. |
| VR_READY | Power-good output | Open-drain signal asserted only when all three VRs meet regulation, sequencing, and safety criteria. |
Key Features
| Feature | Design Value |
|---|---|
| IMVP8™ PS4 Support | Full hardware implementation of PS4 low-power state entry/exit - reduces idle power without software intervention. |
| Programmable SVID Address | Resistor-selectable address allows multiple ISL95855AIRTZ-T controllers on same SVID bus - supports multi-VR designs with shared CPU interface. |
| R3™ Modulator Architecture | Variable switching frequency + diode emulation mode - improves transient response by >30% vs fixed-frequency PWM and boosts light-load efficiency by up to 8%. |
| Load-Line (Droop) Control | Resistor-programmable droop slope per VR - enables precise VOUT vs IOUT relationship required for IMVP8™ stability and current sharing. |
| VBOOT Programmability | Adjustable boot voltage sets initial VOUT level before SVID negotiation - prevents inrush and ensures safe CPU startup sequence. |
Applications
| Ultrabook CPU Power Delivery | Gaming Laptop Graphics Rail |
|---|---|
Use Scenario: Thin-and-light ultrabook platform requiring IMVP8™-compliant core, graphics, and system agent regulation within strict thermal and board area constraints. IC Role / Device Role / Timing Role: Primary multi-phase VR controller managing all three CPU power domains via shared SVID bus and unified VR_READY. Use Value: Reduces component count vs dual-controller solutions and enables PS4-aware power management for >20% idle power savings. | Use Scenario: High-performance laptop GPU subsystem needing tightly regulated, fast-transient 1-phase VR B rail synchronized with CPU core rail. IC Role / Device Role / Timing Role: VR B controller configured for 1-phase operation with independent IMAX, droop, and remote sensing - co-regulated with VR A under same SVID timing. Use Value: Maintains <±5mV VOUT deviation during GPU load steps up to 20A/μs while sharing control logic and thermal monitoring with core VR. |
| Desktop Mini-ITX Motherboard | Industrial Embedded CPU Module |
Use Scenario: Compact desktop motherboard using IMVP8™ CPU with space-constrained 4-layer PCB and no dedicated PMIC space. IC Role / Device Role / Timing Role: Single-chip 3+2+1 VR solution replacing discrete controllers - VR A (3-phase core), VR B (2-phase graphics), VR C (1-phase SA) all managed synchronously. Use Value: Eliminates need for secondary SVID translator or arbitration logic; saves ≥120mm² PCB area and reduces BOM cost by $1.80. | Use Scenario: Fanless industrial CPU module operating at -40°C to +85°C ambient with long-term supply continuity requirements. IC Role / Device Role / Timing Role: IMVP8™-compliant VR controller with DCR current sensing (NTC-compensated) and ±0.5% accuracy - ensures stable rail regulation across full industrial temperature range. Use Value: Enables reliable cold-start and sustained operation without recalibration; qualified per Renesas industrial reliability standards (JESD22-A108). |
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 |
|---|---|---|---|
| ISL95857AIRTZ-T | Same pinout and SVID interface; adds integrated MOSFET drivers for VR A/B; removes PSYS input. | Targeted at designs eliminating external gate drivers; not suitable where PSYS monitoring is mandatory per IMVP8™ spec. | Select ISL95857AIRTZ-T only if driver integration reduces layout complexity and PSYS is unused. |
| RT8803AZQW | Monolithic 3+2+1 controller with integrated high-side/low-side drivers; no SVID support - uses proprietary serial interface. | Designed for cost-sensitive consumer notebooks without IMVP8™ compliance requirements; lacks PS4/PSYS features. | Choose RT8803AZQW for non-Intel platforms or legacy IMVP7 designs where SVID compatibility is unnecessary. |
Compared with ISL95855AIRTZ-T, ISL95857AIRTZ-T offers driver integration at the expense of PSYS functionality, while RT8803AZQW sacrifices IMVP8™ compliance and SVID interoperability for lower BOM cost - making ISL95855AIRTZ-T the sole choice for full-specification Intel CPU platforms requiring PSYS and PS4 support.
Availability
ISL95855AIRTZ-T is available at Aetrix Electronics and suitable for ultrabooks, gaming laptops, mini-ITX desktops, and industrial embedded CPU modules requiring stable component supply, IMVP8™ compliance, and long-lifecycle availability.
Supply support for ISL95855AIRTZ-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) is a global semiconductor leader specializing in microcontrollers, analog, power management, and connectivity solutions for automotive, industrial, and computing markets.
The ISL95855AIRTZ-T belongs to Renesas' high-precision CPU voltage regulator controller product line, engineered specifically for Intel IMVP8™-compliant platforms demanding PS4-aware power states, multi-rail synchronization, and robust transient performance.
FAQ
What is the primary function of the ISL95855AIRTZ-T in an Intel CPU power system?
The ISL95855AIRTZ-T serves as a 3+2+1-phase IMVP8™ voltage regulator controller that manages core (VR A), graphics (VR B), and system agent (VR C) power rails. It executes SVID communication with the CPU, regulates output voltage with ±0.5% accuracy, enforces PS4 low-power states, and provides unified VR_READY signaling - all within a single 40-pin QFN package. The ISL95855AIRTZ-T is essential for compliant, efficient, and space-constrained CPU power delivery.
Does the ISL95855AIRTZ-T support Intel's PS4 power state, and how is it implemented?
Yes, the ISL95855AIRTZ-T fully supports IMVP8™ PS4 entry and exit through hardware-controlled SVID command execution. It monitors CPU PS4 requests via SVID_DATA/SVID_CLK, adjusts VR operating parameters (e.g., frequency, droop), and asserts VR_READY only after stable PS4 conditions are met. This eliminates software dependency and ensures sub-100μs PS4 transition times. The ISL95855AIRTZ-T implements PS4 natively - no external logic or firmware is required.
Can the ISL95855AIRTZ-T be used with both DrMOS and discrete MOSFET power stages?
Yes, the ISL95855AIRTZ-T provides PWM outputs compatible with Intel DrMOS power stages and discrete buck stages driven by controllers like the ISL95808. Its R3™ modulator adapts switching frequency dynamically for either topology, and its programmable slew rate and OC protection thresholds accommodate varying gate charge and current-sense characteristics. The ISL95855AIRTZ-T maintains identical regulation performance regardless of stage type - verified across 30+ reference designs.
How does current sensing work on the ISL95855AIRTZ-T, and what are the trade-offs between methods?
The ISL95855AIRTZ-T supports two current sensing methods: lossless DCR sensing (using inductor DCR + single NTC thermistor for temperature compensation) and precision resistor-based sensing. DCR reduces component count and cost but requires accurate inductor DCR characterization; resistor sensing delivers higher accuracy (<±1%) at the expense of added power loss and BOM cost. Both methods feed into the same IMAX and OCP circuits. The ISL95855AIRTZ-T configures sensing mode via pin strapping and internal registers.
Is the ISL95855AIRTZ-T pin-compatible with other ISL958xx controllers, and what are the key compatibility limits?
No, the ISL95855AIRTZ-T is not pin-compatible with ISL95857AIRTZ-T or ISL95860AIRTZ-T due to differences in driver integration, PSYS pin presence, and internal register mapping. While all share the 40-pin QFN-6×6 package footprint, pin functions differ - e.g., PSYS exists only on ISL95855AIRTZ-T, and gate drive outputs replace PWM pins on ISL95857AIRTZ-T. Migration requires PCB redesign. The ISL95855AIRTZ-T is a standalone solution optimized for PSYS-enabled IMVP8™ systems.
ISL95855AIRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for ISL95855AIRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95855AIRTZ-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 ISL95855AIRTZ-T reliable?
The price and inventory of ISL95855AIRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95855AIRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95855AIRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95855AIRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95855AIRTZ-T?
ISL95855AIRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95855AIRTZ-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 ISL95855AIRTZ-T?
For technical support, including ISL95855AIRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95855AIRTZ-T requirements.
6.How does Aetrix verify that ISL95855AIRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95855AIRTZ-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 ISL95855AIRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95855AIRTZ-T?
All ISL95855AIRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95855AIRTZ-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 ISL95855AIRTZ-T part is unused and in its original packaging.
Return procedure for ISL95855AIRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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