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Renesas ISL95857IRTZ-T
- Part No.:
- ISL95857IRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857IRTZ-T.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,141
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Product details
Overview
ISL95857IRTZ-T from Renesas (formerly Intersil) is a 1+2+1-phase voltage regulator controller for Intel IMVP8™ CPUs, delivering precise regulation for core (VR A), graphics (VR B), and system agent (VR C) rails with 0.5% system accuracy over temperature, DCR/resistor current sensing, and R3™ modulator technology enabling fast transient response and diode emulation at light load.
For engineers reviewing the ISL95857IRTZ-T datasheet, ISL95857IRTZ-T pinout, ISL95857IRTZ-T application, or ISL95857IRTZ-T equivalent, key selection considerations include IMVP8™ SVID compliance, three-rail programmable phase configuration (1/2/1), PSYS input power monitoring support, remote differential voltage sensing, and compatibility with DrMOS or discrete power stages using ISL95808 drivers.
Technical Context
The ISL95857IRTZ-T implements a Robust Ripple Regulator (R3™) modulator architecture that dynamically adjusts switching frequency during load transients to minimize voltage deviation, while supporting diode emulation mode for improved light-load efficiency. It integrates a single serial control bus compliant with Intel SVID for coordinated communication across all three VR outputs.
All three outputs share VR_READY signaling and support independent programmable parameters including IMAX, switching frequency, and load-line resistance (e.g., VR A = 2.4mΩ, VR B = 2mΩ, VR C = 10.3mΩ), with DCR current sensing enabled via a single NTC thermistor for temperature compensation or optional precision resistor-based sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Accuracy | 0.5% system accuracy over temperature ensures tight CPU rail tolerance under thermal stress. |
| VR Configuration | 1+2+1-phase: VR A (1-phase), VR B (configurable 1- or 2-phase), VR C (1-phase) supports IMVP8™ rail segmentation. |
| Current Sensing | Supports lossless DCR sensing with NTC compensation or high-precision resistor sensing for accurate load reporting. |
| Load-Line Resistance | Programmable per rail: VR A = 2.4mΩ, VR B = 2mΩ, VR C = 10.3mΩ enables precise droop-based voltage positioning. |
| SVID Compliance | Fully compliant with Intel IMVP8™ Serial Voltage Identification Bus for dynamic voltage/frequency scaling. |
| PSYS Monitoring | Integrated system input power monitor (PSYS) interface enables real-time platform-level power budgeting. |
| Remote Sensing | Differential remote voltage sense on all three outputs eliminates PCB IR drop errors for stable regulation. |
Pinout & Package
ISL95857IRTZ-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 ISL95857 datasheet Rev 2.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 5V–21V input for internal LDOs and bias circuitry; powers gate drivers indirectly via external buck stage. |
| VDDIO | I/O supply | 3.3V supply for SVID interface and logic; must be stable before SVID communication initiates. |
| SVID_DATA / SVID_CLK | SVID serial bus interface | Two-wire bidirectional interface for CPU-controlled voltage/frequency commands and telemetry reporting. |
| VR_READY | Power-good indicator | Open-drain output asserting when all three VRs meet regulation and sequencing requirements. |
| PSYS | System input power monitor input | Analog input accepting scaled system input power signal for IMVP8™ PSYS compliance and platform power management. |
| SENSE+/SENSE− | Differential remote sense pair | Per-rail differential inputs eliminating PCB trace resistance error; used for all three VR outputs. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Architecture | Enables variable-frequency operation during transients for <10µs settling time and diode emulation at light load to reduce quiescent power. |
| Three-Rail SVID Control | Single serial bus manages VR A, VR B, and VR C simultaneously-reducing component count and board area vs. multi-controller solutions. |
| Programmable Load-Line | Independent mΩ-level load-line resistance setting per rail (2.4mΩ, 2mΩ, 10.3mΩ) ensures correct voltage positioning per IMVP8™ rail specification. |
| DCR + NTC Compensation | Inductor DCR current sensing with single NTC thermistor provides accurate, low-cost current measurement without shunt resistors. |
| PSYS Interface Support | Direct analog PSYS input enables real-time system-level power tracking required for IMVP8™ platform power management. |
Applications
| Core Voltage Regulation (VR A) | Graphics Voltage Regulation (VR B) |
|---|---|
Use Scenario: High-performance CPU core rail in ultrabook platforms requiring rapid load-step response and tight voltage tolerance. IC Role / Device Role / Timing Role: Primary IMVP8™ SVID-controlled 1-phase VR controller regulating VCORE with 2.4mΩ load line. Use Value: 0.5% system accuracy and R3™ fast transient response ensure stable operation during burst workloads like video encoding. | Use Scenario: Adaptive GPU voltage rail in convertible tablets where graphics load varies widely between idle and gaming modes. IC Role / Device Role / Timing Role: Configurable 1-/2-phase VR controller for VGT with 2mΩ load line and PSYS-enabled power capping. Use Value: Phase reconfiguration and diode emulation mode extend battery life during light GPU usage while maintaining transient headroom. |
| System Agent Rail (VR C) | IMVP8™ Platform Power Management |
Use Scenario: Low-current but noise-sensitive system agent rail in desktop motherboards handling memory controller and PCIe root complex. IC Role / Device Role / Timing Role: Dedicated 1-phase VR controller for VSA with 10.3mΩ load line and differential remote sensing. Use Value: High-accuracy remote sensing and independent IMAX programming prevent SA instability during memory-intensive tasks. | Use Scenario: Full-platform power coordination in thin-and-light notebooks meeting Intel's PS4 low-power state requirements. IC Role / Device Role / Timing Role: Centralized SVID controller enabling synchronized rail shutdown, PSYS reporting, and VR_READY sequencing. Use Value: Integrated PSYS interface and single VR_READY signal simplify firmware implementation of IMVP8™ power state transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail IMVP8™ voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855IRTZ-T | 2+1+1-phase configuration (VR A/B = 2-phase, VR C = 1-phase); identical R3™ modulator and SVID interface. | Better suited for higher-current CPU cores requiring dual-phase VCORE; lacks VR B configurability of ISL95857IRTZ-T. | Select ISL95855IRTZ-T when VCORE current exceeds 1-phase capability; retain ISL95857IRTZ-T for balanced 1/2/1-phase allocation. |
| RT8803AGQW | Monolithic 3-rail IMVP8™ controller with integrated gate drivers; no external driver requirement; different pinout and SVID timing. | Reduces BOM count by integrating drivers but limits flexibility in power stage selection and thermal layout. | Choose RT8803AGQW for compact designs prioritizing integration; prefer ISL95857IRTZ-T when using discrete DrMOS or ISL95808 drivers. |
Compared with ISL95855IRTZ-T and RT8803AGQW, the ISL95857IRTZ-T uniquely balances phase flexibility (configurable VR B), external driver compatibility, and PSYS support-making it optimal for mid-range IMVP8™ platforms needing scalable, thermally distributed power delivery.
Availability
ISL95857IRTZ-T is available at Aetrix Electronics and suitable for IMVP8™-compliant notebooks, ultrabooks, desktop motherboards, and tablet platforms requiring stable component supply, long-term lifecycle support, and consistent electrical performance across production batches.
Supply support for ISL95857IRTZ-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 acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio, emphasizing reliability, automotive-grade qualification, and computing power integrity.
The ISL95857IRTZ-T belongs to Renesas' IMVP8™-certified multi-rail controller product line, engineered specifically for Intel client platform power delivery with emphasis on SVID interoperability, transient robustness, and thermal-aware current sensing.
FAQ
What is the primary function of the ISL95857IRTZ-T in an Intel IMVP8™ platform?
The ISL95857IRTZ-T serves as a 1+2+1-phase voltage regulator controller managing three independent CPU power rails-VCORE (VR A), VGT (VR B), and VSA (VR C)-with full SVID compliance, differential remote sensing, and R3™ modulator technology. Its design ensures precise, coordinated regulation aligned with Intel IMVP8™ specifications, and the ISL95857IRTZ-T is validated for use with both DrMOS and discrete power stages.
Does the ISL95857IRTZ-T support PSYS (system input power monitoring)?
Yes, the ISL95857IRTZ-T includes a dedicated PSYS analog input pin that interfaces directly with the system input power monitor circuit, enabling real-time platform-level power reporting required by IMVP8™ PS4 power state compliance. This feature allows firmware to enforce dynamic power capping, and the ISL95857IRTZ-T processes PSYS data internally without external ADC support.
How does the R3™ modulator in the ISL95857IRTZ-T improve transient response?
The R3™ modulator in the ISL95857IRTZ-T dynamically adjusts switching frequency during load transients to minimize output voltage deviation, achieving faster settling times than fixed-frequency controllers. It also enables diode emulation mode at light loads, reducing switching losses. These behaviors are intrinsic to the ISL95857IRTZ-T's architecture and documented in FN8750 Rev 2.00.
Can the ISL95857IRTZ-T be used with discrete MOSFETs instead of DrMOS?
Yes, the ISL95857IRTZ-T provides PWM outputs compatible with discrete power stages, including direct interfacing with the ISL95808 high-voltage synchronous buck MOSFET driver. Its gate drive timing and dead-time control are optimized for discrete FETs, and the ISL95857IRTZ-T datasheet explicitly lists ISL95808 as a supported companion device.
What current sensing methods does the ISL95857IRTZ-T support?
The ISL95857IRTZ-T supports two validated 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 the ISL95857IRTZ-T includes dedicated analog front-end circuitry for each approach as specified in FN8750 Rev 2.00.
ISL95857IRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- IMVP8™ Compliant Notebooks, Desktops, Ultrabooks and Tablets
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 3
- Voltage - Output:
- Adjustable
- Operating Temperature:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857IRTZ-T FAQ
1.How can I place an order for ISL95857IRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857IRTZ-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 ISL95857IRTZ-T reliable?
The price and inventory of ISL95857IRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857IRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95857IRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857IRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857IRTZ-T?
ISL95857IRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857IRTZ-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 ISL95857IRTZ-T?
For technical support, including ISL95857IRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857IRTZ-T requirements.
6.How does Aetrix verify that ISL95857IRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95857IRTZ-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 ISL95857IRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95857IRTZ-T?
All ISL95857IRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857IRTZ-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 ISL95857IRTZ-T part is unused and in its original packaging.
Return procedure for ISL95857IRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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