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Renesas ISL95855AHRTZ-T
- Part No.:
- ISL95855AHRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95855AHRTZ-T.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 48TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL95855AHRTZ-T from Renesas (formerly Intersil) is a 3+2+1-phase IMVP8™ CPU voltage regulator controller for Intel microprocessors, delivering core (VR A), graphics (VR B), and system agent (VR C) rail regulation with 0.5% system accuracy over temperature, programmable SVID address, and support for DCR/resistor current sensing. It enables compact, cost-effective power delivery in ultrabooks and thin notebooks.
For engineers reviewing the ISL95855AHRTZ-T datasheet, ISL95855AHRTZ-T pinout, ISL95855AHRTZ-T application, or ISL95855AHRTZ-T equivalent, key selection criteria include IMVP8™ PS4 compliance, R3™ modulator transient response, 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 ISL95855AHRTZ-T implements Intersil's Robust Ripple Regulator (R3™) topology, enabling variable switching frequency during load transients and diode emulation mode at light load to improve efficiency. It uses a single serial control bus (SVID) to interface with Intel CPUs, supporting full PS4 entry/exit and system input power monitoring (PSYS).
All three VR outputs feature differential remote voltage sensing, resistor-programmable IMAX/slew rate/frequency/droop, and OC protection with shared VR_READY signal. Current sensing supports lossless DCR with single NTC thermistor compensation or precision resistor-based sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IMVP8™ Compliance | Fully compliant with Intel IMVP8™ specification including PS4 low-power state entry/exit and SVID protocol timing. |
| VR Output Configuration | VR A: 3-/2-/1-phase; VR B: 2-/1-phase; VR C: 1-phase - enables flexible rail partitioning for CPU core, graphics, and system agent. |
| System Accuracy | ±0.5% over temperature - ensures tight VOUT regulation critical for modern CPU voltage margins. |
| Current Sensing Options | DCR sensing with single-NCT thermistor compensation OR precision resistor sensing - supports lossless or high-accuracy current measurement. |
| R3™ Modulator | Variable-frequency operation + diode emulation mode - reduces light-load switching losses and improves transient settling time. |
| Remote Sense | Differential remote voltage sensing on all three VRs - compensates for PCB IR drop to maintain accurate load-point regulation. |
| PSYS Monitoring | System input power monitor interface supported - enables platform-level power budgeting and thermal management. |
Pinout & Package
ISL95855AHRTZ-T 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 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 5V–24V input for internal LDOs and logic; powers gate drivers via external bootstrap capacitors. |
| VDDIO | I/O supply | 3.3V supply for SVID interface and digital logic; must be stable before SVID communication initiates. |
| SVID_DATA / SVID_CLK | SVID serial bus | Two-wire interface to Intel CPU for VR configuration, telemetry, and PS4 state coordination. |
| VR_Ax_PWM / VR_Bx_PWM / VR_Cx_PWM | PWM outputs | Phase-specific PWM signals driving external DrMOS or discrete buck stages (e.g., ISL95808). |
| SENSE+ / SENSE− | Remote sense pair | Differential inputs per VR output - connected directly to CPU VCC load point to reject PCB trace resistance error. |
| PSYS | System power monitor input | Analog input accepting scaled system input power signal for platform-level power capping and thermal throttling. |
| VR_READY | Power-good indicator | Open-drain output asserted when all three VRs meet regulation, sequencing, and fault-free conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable SVID Address | Resistor-selectable address allows multiple ISL95855AHRTZ-T controllers on same SVID bus without conflict. |
| Adaptive Body Diode Conduction Reduction | Minimizes reverse conduction loss in synchronous MOSFETs during light-load discontinuous conduction mode. |
| VBOOT Programmability | Configurable boot voltage sets initial output level during cold start - prevents CPU brown-out during initialization. |
| Load-Line (Droop) Programming | Resistor-adjustable droop slope maintains stable loop response across varying load currents and output capacitance. |
| Low PS4 Supply Current | Sub-100µA quiescent current in PS4 state - meets IMVP8™ deep-sleep power budget requirements. |
Applications
| Ultrabook CPU Power Delivery | Notebook Graphics Rail Regulation |
|---|---|
Use Scenario: Thin-and-light Windows ultrabooks requiring IMVP8™-compliant multi-rail CPU power with strict thermal and board-area constraints. IC Role / Device Role / Timing Role: Primary 3+2+1-phase VR controller managing core (VR A), graphics (VR B), and system agent (VR C) rails under SVID command from Intel CPU. Use Value: Enables single-chip solution replacing dual-controller designs, reducing BOM count and PCB area while maintaining ±0.5% regulation accuracy. | Use Scenario: High-performance notebook platforms where GPU voltage must track CPU graphics rail with independent phase control and telemetry. IC Role / Device Role / Timing Role: VR B output configured as 2-phase regulator dedicated to Intel HD Graphics rail, synchronized via shared SVID bus and VR_READY handshake. Use Value: Delivers fast transient response (<10µs settling) and precise load-line control to sustain GPU boost clocks under dynamic workloads. |
| Desktop IMVP8™ System Agent Supply | Tablet Platform PSYS-Aware Power Management |
Use Scenario: Compact desktop motherboards implementing IMVP8™ for legacy-compatible CPU support with minimal VR footprint. IC Role / Device Role / Timing Role: VR C output operating as dedicated 1-phase system agent rail, decoupled from core/graphics but sharing SVID bus and fault reporting. Use Value: Eliminates need for separate SA controller; leverages shared VR_READY and OC protection logic to simplify system power sequencing. | Use Scenario: Fanless tablet platforms requiring real-time system input power awareness for thermal throttling and battery life optimization. IC Role / Device Role / Timing Role: PSYS input monitors total DC input power; ISL95855AHRTZ-T relays data to CPU for coordinated power capping across CPU/GPU/memory subsystems. Use Value: Enables hardware-accelerated platform power budgeting without host software polling - reduces latency and CPU overhead. |
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 |
|---|---|---|---|
| ISL95855HRTZ-T | Same die, non-A version - lacks IMVP8™ PS4 support and some SVID timing enhancements in ISL95855A. | Not suitable for platforms requiring PS4 entry/exit or strict IMVP8™ compliance; limited to IMVP7/legacy use. | Select ISL95855AHRTZ-T only when PS4 and full IMVP8™ feature set are required. |
| RT8803AGQW | Richtek part with 3+2+1-phase architecture but different SVID implementation, no PSYS input, and fixed 0.6% accuracy. | Used in cost-sensitive notebooks where PSYS monitoring and sub-0.5% accuracy are not mandated. | Choose RT8803AGQW if PSYS and ±0.5% accuracy are unnecessary and Richtek ecosystem integration is preferred. |
Compared with ISL95855HRTZ-T and RT8803AGQW, the ISL95855AHRTZ-T uniquely delivers full IMVP8™ PS4 compliance, ±0.5% system accuracy, and PSYS monitoring - making it the only option for next-generation Intel CPU platforms requiring coordinated low-power states and platform-level power telemetry.
Availability
ISL95855AHRTZ-T 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 traceable sourcing for volume production.
Supply support for ISL95855AHRTZ-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 maintains its high-performance analog and power management portfolio for computing, industrial, and automotive markets.
The ISL95855AHRTZ-T belongs to Renesas' IMVP8™-optimized CPU voltage regulator controller product line, designed specifically to replace multi-chip VR solutions in space-constrained Intel-based client platforms.
FAQ
What is the primary function of the ISL95855AHRTZ-T in an Intel CPU power system?
The ISL95855AHRTZ-T serves as a 3+2+1-phase IMVP8™-compliant voltage regulator controller, managing core (VR A), graphics (VR B), and system agent (VR C) rails via SVID interface. It provides PWM outputs, remote sensing, OC protection, and PSYS monitoring - all integrated into a single QFN package to reduce system complexity and PCB area. The ISL95855AHRTZ-T is essential for meeting Intel's PS4 low-power state requirements and tight voltage accuracy mandates.
Does the ISL95855AHRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95855AHRTZ-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 permits. Both methods are fully supported across all three VR outputs and are selected at design time via external component choice - no firmware or register changes are needed. This flexibility is built into the ISL95855AHRTZ-T's analog front-end architecture.
How does the R3™ modulator in the ISL95855AHRTZ-T improve transient response compared to traditional voltage-mode controllers?
The R3™ modulator in the ISL95855AHRTZ-T achieves faster transient settling by dynamically adjusting switching frequency in response to load steps and enabling diode emulation mode at light loads. Unlike fixed-frequency voltage-mode controllers, R3™ eliminates loop compensation dependency on output capacitance, resulting in consistent response across wide load ranges. This behavior is intrinsic to the ISL95855AHRTZ-T's analog control architecture and is verified in Figure 1 load-line regulation plots.
Can the ISL95855AHRTZ-T be used in platforms that do not require PS4 support?
Yes, the ISL95855AHRTZ-T remains functional in non-PS4 platforms - its core VR control, remote sensing, and protection features operate independently of PS4 state handling. However, the ISL95855AHRTZ-T is optimized for IMVP8™ compliance, so using it outside that context may incur unnecessary cost versus legacy alternatives like ISL95855HRTZ-T. Designers should verify SVID timing and VR_READY behavior matches their CPU's expectations when omitting PS4 usage.
What package type and thermal characteristics does the ISL95855AHRTZ-T use?
The ISL95855AHRTZ-T uses a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad for enhanced heat dissipation. Its θJA is 32°C/W typical on a 4-layer JEDEC board, and the device supports junction temperatures from –40°C to +105°C. The thermal pad must be soldered to a solid copper plane per Intersil layout guidelines to ensure reliable operation under full 3-phase VR A load. This package is standard across the ISL95855A family and confirmed in FN8820 Rev.0.00.
ISL95855AHRTZ-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)
ISL95855AHRTZ-T FAQ
1.How can I place an order for ISL95855AHRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95855AHRTZ-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 ISL95855AHRTZ-T reliable?
The price and inventory of ISL95855AHRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95855AHRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95855AHRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95855AHRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95855AHRTZ-T?
ISL95855AHRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95855AHRTZ-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 ISL95855AHRTZ-T?
For technical support, including ISL95855AHRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95855AHRTZ-T requirements.
6.How does Aetrix verify that ISL95855AHRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95855AHRTZ-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 ISL95855AHRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95855AHRTZ-T?
All ISL95855AHRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95855AHRTZ-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 ISL95855AHRTZ-T part is unused and in its original packaging.
Return procedure for ISL95855AHRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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