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Renesas ISL95855IRTZ
- Part No.:
- ISL95855IRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95855IRTZ.pdf
- Description:
- IC PWM CTLR 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:340
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Product details
Overview
ISL95855IRTZ 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, 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 ISL95855IRTZ datasheet, ISL95855IRTZ pinout, ISL95855IRTZ application, or ISL95855IRTZ equivalent, key selection considerations include IMVP8™ compliance, three independent VR outputs with phase configurability (3/2/1-, 2/1-, and 1-phase), R3™ modulator transient response, PSYS monitoring capability, and compatibility with DrMOS or discrete power stages using ISL95808 drivers.
Technical Context
The ISL95855IRTZ implements Intersil's Robust Ripple Regulator (R3™) topology, enabling variable switching frequency during load transients and diode emulation mode for improved light-load efficiency. It integrates a shared serial control bus compliant with Intel SVID for communication with IMVP8™ CPUs.
All three VR outputs feature differential remote voltage sensing, programmable IMAX, adjustable switching frequency, overcurrent protection, and a unified VR_READY signal. Current sensing supports lossless DCR with single NTC thermistor compensation or high-precision resistor-based methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IMVP8™ Compliance | Fully compliant with Intel IMVP8™ specification including PS4 low-power state and SVID interface timing. |
| VR Output Configuration | VR A: 3-/2-/1-phase; VR B: 2-/1-phase; VR C: 1-phase - enables flexible rail partitioning per CPU subsystem. |
| System Accuracy | ±0.5% over temperature - ensures tight VOUT regulation critical for modern CPU voltage margins. |
| Current Sensing | Supports both DCR (with NTC compensation) and precision resistor sensing - allows trade-off between cost and accuracy. |
| R3™ Modulator | Variable-frequency operation + diode emulation - reduces switching losses at light load and improves transient settling time. |
| PSYS Monitoring | Integrated system input power monitor - enables real-time platform-level power budgeting and thermal management. |
| Voltage Sense | Differential remote sensing on all three outputs - eliminates PCB trace IR drop errors for accurate load regulation. |
Pinout & Package
ISL95855IRTZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95855 datasheet (FN8741), supporting SVID bus, PWM outputs, sense inputs, and configuration resistors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVID_DATA / SVID_CLK | SVID serial interface | Two-wire bidirectional bus for CPU communication, configuration, and telemetry reporting. |
| VR_A_PWMx (x=1–3) | Phase PWM outputs | Three independent gate-drive signals for VR A; configurable for 3-, 2-, or 1-phase operation. |
| VR_B_PWMx (x=1–2) | Phase PWM outputs | Two gate-drive signals for VR B; configurable for 2- or 1-phase operation. |
| VR_C_PWM | Single-phase PWM output | Dedicated gate-drive signal for VR C (system agent rail). |
| VSNSA+/VSNSA−, etc. | Differential remote sense | Paired inputs per VR for Kelvin sensing - rejects PCB resistance error and improves regulation accuracy. |
| PSYS_IN | System power monitor input | Analog input for external shunt or current-sense amplifier to enable PSYS telemetry. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable SVID Address | Resistor-selectable address enables multiple ISL95855IRTZ controllers on same SVID bus without conflict. |
| VBOOT Programmability | Adjustable boot voltage prevents inrush current and ensures controlled startup sequencing for sensitive CPU rails. |
| Adaptive Body Diode Reduction | Minimizes synchronous rectifier body diode conduction time - reduces conduction loss and improves efficiency. |
| Unified VR_READY Signal | Single power-good indicator for all three VRs - simplifies motherboard power sequencing logic and reduces component count. |
| Resistor-Programmable Parameters | IMAX, slew rate, switching frequency, and droop set via external resistors - eliminates need for EEPROM or firmware tuning. |
Applications
| Ultrabook CPU Power Delivery | IMVP8™ Desktop Motherboard |
|---|---|
Use Scenario: Thin-and-light notebook requiring strict IMVP8™ compliance, low standby power, and minimal board area. IC Role / Device Role / Timing Role: Primary 3+2+1-phase VR controller managing core, graphics, and system agent rails under SVID command from CPU. Use Value: Enables PS4-state compliance and 0.5% regulation accuracy while reducing component count via shared SVID bus and unified VR_READY. | Use Scenario: High-performance desktop platform needing robust transient response and flexible phase allocation across CPU domains. IC Role / Device Role / Timing Role: Multi-rail voltage regulator controller coordinating three independent VRs with adaptive R3™ modulation. Use Value: Delivers fast load-step response and selectable DCR/resistor current sensing - critical for stable overclocking and thermal headroom. |
| Tablet Platform Power Management | Embedded Industrial CPU Module |
Use Scenario: Fanless tablet design requiring low-noise, high-efficiency power delivery with minimal thermal footprint. IC Role / Device Role / Timing Role: IMVP8™-compliant controller supporting PSYS monitoring and diode-emulation light-load mode. Use Value: Achieves >90% efficiency at 10% load via R3™ variable frequency and reduces audible noise by eliminating fixed-frequency PWM artifacts. | Use Scenario: Long-lifecycle industrial compute module needing supply continuity, traceable sourcing, and extended temperature stability. IC Role / Device Role / Timing Role: Precision voltage regulator controller with differential remote sensing and ±0.5% accuracy over full industrial temp range. Use Value: Ensures reliable CPU operation under thermal stress and voltage droop conditions common in sealed enclosures. |
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 |
|---|---|---|---|
| IR35201MTRPBF | 4+3+1-phase IMVP8™ controller with integrated MOSFET drivers; higher pin count and larger 56-QFN package. | Targets higher-current platforms requiring more phases; lacks PSYS input but adds integrated driver stage. | Choose IR35201MTRPBF when board space permits larger package and integrated drivers reduce BOM count. |
| RT8802AGQW | 3+2+1-phase IMVP8™ controller with dual SVID interfaces and enhanced telemetry; uses different address programming scheme. | Supports dual-CPU or multi-socket configurations; offers richer telemetry but requires additional SVID routing. | Choose RT8802AGQW when dual-SVID support or extended telemetry (e.g., per-phase temperature) is required. |
Compared with IR35201MTRPBF and RT8802AGQW, the ISL95855IRTZ provides optimal balance of phase flexibility, PSYS monitoring, and compact 48-QFN packaging - making it ideal for space-constrained ultrabook and tablet designs where SVID bus sharing and unified VR_READY simplify layout.
Availability
ISL95855IRTZ is available at Aetrix Electronics and suitable for ultrabooks, IMVP8™-compliant desktop motherboards, and fanless tablet platforms requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ISL95855IRTZ 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 (formerly Intersil) is a global semiconductor leader specializing in analog, power, and embedded processing solutions for computing, industrial, and automotive markets.
The ISL95855IRTZ belongs to Renesas' IMVP8™-compliant CPU voltage regulator controller product line, engineered specifically for high-efficiency, multi-rail power delivery in Intel-based mobile and desktop platforms.
FAQ
What is the primary function of the ISL95855IRTZ in an Intel CPU power system?
The ISL95855IRTZ serves as a 3+2+1-phase IMVP8™-compliant voltage regulator controller that manages three independent power rails - core (VR A), graphics (VR B), and system agent (VR C) - using SVID communication with the CPU. Its R3™ modulator architecture delivers fast transient response and high light-load efficiency, making it essential for stable, efficient CPU power delivery in ultrabooks and tablets.
Does the ISL95855IRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95855IRTZ supports two current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for cost-sensitive designs, and precision resistor-based sensing for higher accuracy. Both methods are fully supported across all three VR outputs and can be selected at design time without firmware changes.
How does the PSYS input on the ISL95855IRTZ enhance platform power management?
The PSYS input on the ISL95855IRTZ accepts an analog signal from an external current-sense amplifier or shunt resistor, enabling real-time measurement of total system input power. This data feeds into Intel's power budgeting algorithms, allowing dynamic thermal and power throttling - a critical capability for fanless tablets and thermally constrained ultrabooks using the ISL95855IRTZ.
Can the ISL95855IRTZ be used with discrete MOSFETs instead of DrMOS?
Yes, the ISL95855IRTZ is compatible with both DrMOS power stages and discrete MOSFETs driven by external gate drivers such as the Intersil ISL95808. Its PWM outputs are designed to interface directly with high-voltage synchronous buck drivers, providing full flexibility in power stage selection based on cost, efficiency, and thermal requirements for the ISL95855IRTZ-based design.
What package type and thermal characteristics does the ISL95855IRTZ use?
The ISL95855IRTZ is packaged in a 48-pin QFN (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad. This package supports efficient heat dissipation in high-density laptop and tablet layouts. The device operates over –40°C to +105°C ambient, with internal thermal monitoring and shutdown protection ensuring reliability in the ISL95855IRTZ's target applications.
ISL95855IRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Converter, Intel IMVP-7, VR12™
- Voltage - Input:
- -
- Number of Outputs:
- 3
- Voltage - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFN (6x6)
ISL95855IRTZ FAQ
1.How can I place an order for ISL95855IRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95855IRTZ 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 ISL95855IRTZ reliable?
The price and inventory of ISL95855IRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95855IRTZ is usually 5 days.
3.What payment methods are accepted for ISL95855IRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95855IRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95855IRTZ?
ISL95855IRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95855IRTZ 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 ISL95855IRTZ?
For technical support, including ISL95855IRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95855IRTZ requirements.
6.How does Aetrix verify that ISL95855IRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95855IRTZ 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 ISL95855IRTZ meets industry standards.
7.What is the process for return or replacement of ISL95855IRTZ?
All ISL95855IRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95855IRTZ, 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 ISL95855IRTZ part is unused and in its original packaging.
Return procedure for ISL95855IRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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