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Renesas ISL95857AIRTZ-T
- Part No.:
- ISL95857AIRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857AIRTZ-T.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,991
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Product details
Overview
ISL95857AIRTZ-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. It supports DCR/resistor current sensing, differential remote sensing, 0.5% system accuracy over temperature, and PS4 power-state compliance.
For engineers reviewing the ISL95857AIRTZ-T datasheet, ISL95857AIRTZ-T pinout, ISL95857AIRTZ-T application, or ISL95857AIRTZ-T equivalent, key selection factors include IMVP8™ serial bus interface support, VR B's 1-/2-phase configurability, R3™ modulator transient response, PSYS monitoring capability, and SVID address programmability.
Technical Context
The ISL95857AIRTZ-T implements Intel Serial Voltage Identification (SVID) protocol over a shared 2-wire bus to coordinate with IMVP8™ CPUs across three independent VR outputs. It integrates Robust Ripple Regulator (R3™) modulation, enabling variable switching frequency during load transients and diode-emulation mode for light-load efficiency.
All three VRs share one VR_READY signal and support programmable IMAX, adjustable switching frequency, OC protection, and lossless DCR current sensing with single-NTC thermal compensation. VR B is uniquely configurable for either 1- or 2-phase operation via external resistor programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Architecture | 1+2+1-phase VR controller for IMVP8™: VR A (1-phase), VR B (1-/2-phase configurable), VR C (1-phase) |
| System Accuracy | ±0.5% over temperature - ensures tight VOUT tolerance for CPU rail stability under thermal stress |
| Current Sensing | Supports both DCR (with NTC compensation) and precision resistor methods - enables flexible, cost-optimized or high-accuracy designs |
| Modulation Technology | R3™ (Robust Ripple Regulator) - delivers faster transient settling and load-dependent frequency scaling for efficiency |
| PS4 Compliance | Fully supports IMVP8™ PS4 entry/exit - required for ultra-low-power idle states in modern notebooks and ultrabooks |
| Interface Protocol | SVID 2-wire serial bus - enables direct CPU communication for dynamic voltage/frequency scaling and telemetry |
| Remote Sensing | Differential remote voltage sense on all three outputs - eliminates PCB IR drop errors for accurate load-point regulation |
Pinout & Package
ISL95857AIRTZ-T is housed in a 40-pin QFN package (6mm × 6mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per Renesas FN8856 Rev 0.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_A, VIN_B, VIN_C | Input voltage supply pins per VR rail | Independent input connections allow optimized layout and decoupling for each phase group |
| PHASE_A, PHASE_B, PHASE_C | PWM output drivers | Drive external DrMOS or discrete buck stages; PHASE_B supports dual-phase interleaving when configured |
| SENSE_A+, SENSE_A−, etc. | Differential remote sense inputs | Enable Kelvin connection to CPU pads - critical for sub-10mV regulation accuracy at high currents |
| SVID_CLK, SVID_DATA | SVID serial bus interface | Shared 2-wire bus for CPU communication - reduces routing complexity vs. multi-controller solutions |
| VR_READY | Power-good indicator | Single open-drain output signals valid regulation across all three VRs - simplifies system power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| VR B phase configurability | Resistor-selectable 1- or 2-phase operation - adapts VR B to GPU power demand without changing controller IC |
| PSYS monitoring support | Enables system-level input power telemetry - required for IMVP8™ platform power budgeting and thermal management |
| Programmable SVID address | Resistor-settable address allows multiple ISL95857AIRTZ-T controllers on same SVID bus - supports multi-CPU or hybrid SoC designs |
| R3™ modulation | Variable-frequency operation during transients + diode-emulation mode - improves dynamic response while maintaining >85% efficiency at 10% load |
| DCR temperature compensation | Single NTC thermistor compensates inductor DCR drift - achieves ±1% current sense accuracy from −10°C to +100°C |
Applications
| Notebook CPU Power Delivery | Ultrabook Graphics Rail Control |
|---|---|
Use Scenario: High-density mobile platforms requiring strict IMVP8™ compliance and PS4 state support. IC Role / Device Role / Timing Role: Primary VR controller managing VCORE (VR A), VGT (VR B), and VSA (VR C) with unified SVID interface. Use Value: Reduces component count vs. discrete VR solutions and ensures <100μs transient response for burst workloads. | Use Scenario: Thin-and-light ultrabooks with discrete GPU or integrated Iris Pro graphics demanding dynamic VGT scaling. IC Role / Device Role / Timing Role: Configures VR B as 2-phase for higher GPU current delivery while maintaining VR A/C as 1-phase for CPU cores/agent. Use Value: Enables scalable graphics power up to 45A with adaptive load-line (2mΩ) and real-time current telemetry. |
| Desktop IMVP8™ Reference Design | Tablet Platform System Agent Supply |
Use Scenario: Enthusiast desktop motherboards targeting Intel 4th–6th Gen Core processors with overclocking headroom. IC Role / Device Role / Timing Role: Delivers stable VCORE and VSA rails with programmable IMAX and adjustable switching frequency (200–1000kHz). Use Value: Supports fine-grained frequency tuning to balance EMI, efficiency, and thermal performance across operating conditions. | Use Scenario: Fanless tablet platforms where low-noise, high-efficiency VSA regulation is critical for SoC subsystem stability. IC Role / Device Role / Timing Role: Supplies VSA rail (VR C) with 10.3mΩ load line and differential remote sensing to minimize voltage droop at SoC I/O interfaces. Use Value: Maintains ±5mV regulation accuracy at 3A load despite PCB trace resistance, ensuring reliable PCIe/USB PHY operation. |
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 |
|---|---|---|---|
| ISL95857IRTZ-T | Same die, identical electrical specs; differs only in tape-and-reel packaging (no suffix 'A' in part number) | No functional difference - used interchangeably in IMVP8™ designs where RoHS-compliant lead-free finish is required | Select ISL95857IRTZ-T if legacy BOM uses non-'A' variant; verify Pb-free qualification status per batch |
| RTQ2136BGQW | Single-chip 3-phase VR controller with integrated MOSFET drivers; lacks PSYS monitor and VR B phase configurability | Targets cost-sensitive embedded IMVP8™ systems without need for PS4 telemetry or GPU scalability | Choose RTQ2136BGQW only for simplified 3-phase-only designs lacking PSYS or dual-mode VR B requirements |
Compared with ISL95857AIRTZ-T, ISL95857IRTZ-T offers identical functionality in alternate packaging, while RTQ2136BGQW trades PSYS support and VR B flexibility for driver integration - making ISL95857AIRTZ-T optimal for full-featured IMVP8™ notebook/ultrabook power delivery.
Availability
ISL95857AIRTZ-T is available at Aetrix Electronics and suitable for notebook CPU power delivery, ultrabook graphics rail control, and desktop IMVP8™ reference designs requiring stable component supply and long-term lifecycle support.
Supply support for ISL95857AIRTZ-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. Renesas is ISO 9001-certified and supplies mission-critical power ICs for computing, industrial, and automotive markets.
The ISL95857AIRTZ-T belongs to Renesas' IMVP8™-compliant VR controller product line, engineered specifically for Intel client platforms requiring coordinated multi-rail regulation, PS4 compliance, and SVID-based CPU interaction.
FAQ
What is the primary function of the ISL95857AIRTZ-T in an Intel IMVP8™ platform?
The ISL95857AIRTZ-T serves as a 1+2+1-phase voltage regulator controller that manages three independent CPU power rails - VCORE (VR A), VGT (VR B), and VSA (VR C) - using Intel's SVID protocol. It provides closed-loop regulation, current sensing, remote sensing, and PS4 power-state support. The ISL95857AIRTZ-T is essential for meeting IMVP8™ timing, accuracy, and telemetry requirements in notebooks and ultrabooks.
Does the ISL95857AIRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95857AIRTZ-T supports dual current sensing methods: lossless inductor DCR sensing with single-NTC thermal compensation, and precision shunt resistor sensing. This flexibility allows designers to optimize for cost (DCR) or accuracy (resistor) without changing the ISL95857AIRTZ-T controller. Both methods are validated across temperature and load for IMVP8™ compliance.
How is VR B phase configuration implemented on the ISL95857AIRTZ-T?
VR B phase configuration on the ISL95857AIRTZ-T is set by an external resistor connected to the PHASE_B_SEL pin: one value configures 1-phase operation, another enables 2-phase interleaved operation. This resistor-programmable feature allows the same ISL95857AIRTZ-T to adapt to varying GPU power demands without firmware or hardware redesign. No register writes or SVID commands are needed.
What does PSYS monitoring enable in systems using the ISL95857AIRTZ-T?
PSYS monitoring, supported by the ISL95857AIRTZ-T, provides real-time system input power telemetry to the CPU via SVID. This enables dynamic platform-level power budgeting, thermal throttling coordination, and battery life optimization in IMVP8™ notebooks and ultrabooks. The ISL95857AIRTZ-T integrates dedicated circuitry to condition and report PSYS data without external components.
Is the ISL95857AIRTZ-T pin-compatible with earlier Intersil IMVP7™ controllers?
No, the ISL95857AIRTZ-T is not pin-compatible with IMVP7™ controllers such as the ISL6367. It features a distinct 40-pin QFN footprint, updated SVID interface logic, and IMVP8™-specific functions like PSYS monitoring and VR B phase configurability. Migration requires PCB layout revision and firmware updates to support the ISL95857AIRTZ-T's enhanced command set and timing parameters.
ISL95857AIRTZ-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:
- Controller, Intel IMVP8
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 3
- Voltage - Output:
- 0.25V ~ 1.52V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857AIRTZ-T FAQ
1.How can I place an order for ISL95857AIRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857AIRTZ-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 ISL95857AIRTZ-T reliable?
The price and inventory of ISL95857AIRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857AIRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95857AIRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857AIRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857AIRTZ-T?
ISL95857AIRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857AIRTZ-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 ISL95857AIRTZ-T?
For technical support, including ISL95857AIRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857AIRTZ-T requirements.
6.How does Aetrix verify that ISL95857AIRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95857AIRTZ-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 ISL95857AIRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95857AIRTZ-T?
All ISL95857AIRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857AIRTZ-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 ISL95857AIRTZ-T part is unused and in its original packaging.
Return procedure for ISL95857AIRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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