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Renesas ISL95857AIRTZ
- Part No.:
- ISL95857AIRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857AIRTZ.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
ISL95857AIRTZ 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 datasheet, ISL95857AIRTZ pinout, ISL95857AIRTZ application, or ISL95857AIRTZ equivalent, key selection factors include IMVP8™ SVID interface compatibility, VR B's 1-/2-phase configurability, PSYS monitoring support, R3™ modulator transient response, and dual current-sensing method flexibility.
Technical Context
The ISL95857AIRTZ implements a Robust Ripple Regulator (R3™) modulator architecture enabling variable switching frequency during load transients and diode-emulation mode for improved light-load efficiency. It integrates a shared SVID serial bus for CPU communication across all three VR outputs, eliminating discrete bus logic and reducing board area.
All three outputs feature independent programmable IMAX, adjustable switching frequency, OC protection, and a unified VR_READY signal. VR B supports dynamic reconfiguration between 1- and 2-phase operation via external resistor programming, while VR A and VR C are fixed 1-phase controllers with distinct load-line coefficients (2.4 mΩ, 10.3 mΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Architecture | Robust Ripple Regulator (R3™) with variable-frequency modulation and diode-emulation mode |
| IMVP8™ Compliance | Fully compliant including PS4 entry/exit, SVID interface, and load-line regulation requirements |
| Output Configuration | Three independent VRs: VR A (1-phase), VR B (1-/2-phase configurable), VR C (1-phase) |
| System Accuracy | ±0.5% over temperature, enabling tight CPU rail tolerance without calibration overhead |
| Current Sensing | Supports lossless DCR sensing with single NTC thermistor compensation or precision resistor-based sensing |
| Remote Sensing | Differential remote voltage sense per VR output to reject PCB IR drop and improve regulation accuracy |
| PSYS Monitoring | Integrated system input power monitor interface for real-time platform-level power tracking |
Pinout & Package
ISL95857AIRTZ is housed in a 40-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95857A datasheet Rev 0.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 5 V to 24 V input; powers internal LDOs and gate drivers |
| VDDIO | I/O supply | 3.3 V supply for SVID interface and logic circuitry |
| SVID_DATA / SVID_CLK | SVID serial bus interface | Two-wire bidirectional interface for CPU communication and VR configuration |
| VR_A_PWM / VR_B_PWM / VR_C_PWM | PWM output drivers | Three independent PWM outputs supporting DrMOS or discrete buck stages |
| VR_READY | Power-good indicator | Single open-drain output signaling valid regulation across all three VRs |
| PSYS_IN | System power monitor input | Analog input for external current-sense amplifier to enable PSYS reporting |
| SENSE+/SENSE− (per VR) | Differential remote sense inputs | Four dedicated pairs (VR A/B/C + common) for accurate load-point voltage feedback |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Technology | Enables sub-10 µs transient settling and adaptive frequency scaling to optimize efficiency across load range |
| Configurable VR B Phase Count | Resistor-selectable 1- or 2-phase operation allows scalable GPU rail design without controller change |
| Shared SVID Bus Architecture | Reduces component count and routing complexity versus multi-controller solutions for IMVP8™ platforms |
| PS4 Power-State Support | Ultra-low quiescent current in PS4 enables deep sleep modes required for modern mobile platform battery life |
| Programmable Load-Line Coefficients | Independent mΩ settings per VR (2.4 mΩ for VR A, 2 mΩ for VR B, 10.3 mΩ for VR C) match Intel-defined droop profiles |
Applications
| Ultrabook Core Power Delivery | Gaming Laptop Graphics Rail |
|---|---|
Use Scenario: High-efficiency, space-constrained VCORE regulation in fanless ultrabooks with strict thermal budgets. IC Role / Device Role / Timing Role: Primary IMVP8™ core voltage controller (VR A) with DCR sensing and remote sense. Use Value: 0.5% system accuracy and R3™ fast transient response maintain CPU stability during burst workloads without oversizing output capacitance. | Use Scenario: Scalable GPU voltage rail in performance-oriented laptops supporting both integrated and discrete graphics. IC Role / Device Role / Timing Role: Configurable VR B controller enabling 1-phase (iGPU) or 2-phase (dGPU) operation via resistor selection. Use Value: Single-part flexibility reduces BOM variants and simplifies platform bring-up across multiple GPU configurations. |
| Desktop Platform System Agent | Thin-and-Light Tablet PSYS Monitoring |
Use Scenario: Stable VSA rail delivery in compact desktop motherboards where layout area is constrained. IC Role / Device Role / Timing Role: Dedicated VR C controller with 10.3 mΩ load line and differential remote sensing. Use Value: Tight regulation under varying load and temperature ensures reliable PCIe root complex and memory controller operation. | Use Scenario: Real-time platform power budgeting in fanless tablets requiring dynamic thermal throttling. IC Role / Device Role / Timing Role: PSYS monitoring interface driver feeding system-level power telemetry to firmware. Use Value: Integrated PSYS_IN analog input eliminates external ADC, reducing solution size and cost while enabling accurate PSYS reporting per IMVP8™ spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IMVP8™ voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855AIRTZ | 2+1-phase controller (VR A/B = 2-phase, VR C = 1-phase); no VR B phase configurability | Fixed dual-phase core + single-phase SA; lacks VR B scalability for GPU | Select when platform requires fixed 2-phase VCORE and does not need graphics rail flexibility |
| RT8802AGQW | Monolithic 3-phase IMVP8™ controller with integrated high-side MOSFET drivers; no external DrMOS support | Higher integration but limited to lower-current applications; incompatible with discrete or DrMOS power stages | Select for cost-sensitive, low-power designs where monolithic integration outweighs flexibility needs |
Compared with ISL95857AIRTZ, ISL95855AIRTZ offers fixed dual-phase core control but omits VR B configurability, while RT8802AGQW integrates power drivers at the expense of DrMOS compatibility-making ISL95857AIRTZ optimal for scalable, high-current, DrMOS-based IMVP8™ platforms.
Availability
ISL95857AIRTZ is available at Aetrix Electronics and suitable for ultrabooks, gaming laptops, desktop motherboards, and thin-and-light tablets requiring stable component supply and full IMVP8™ compliance.
Supply support for ISL95857AIRTZ 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 ISL95857AIRTZ belongs to Renesas' IMVP8™-compliant voltage regulator controller product line, engineered specifically for Intel CPU power delivery in mobile and desktop client platforms with emphasis on transient response, PS4 efficiency, and multi-rail coordination.
FAQ
What is the primary function of the ISL95857AIRTZ in an Intel IMVP8™ platform?
The ISL95857AIRTZ serves as a 1+2+1-phase voltage regulator controller managing three independent CPU power rails: core (VR A), graphics (VR B), and system agent (VR C). It implements Intel's SVID protocol, enforces load-line regulation, and coordinates PS4 power-state transitions. Its R3™ modulator ensures fast transient response critical for modern CPU burst workloads, and the ISL95857AIRTZ is designed exclusively for IMVP8™-compliant client platforms.
Does the ISL95857AIRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95857AIRTZ 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 the ISL95857AIRTZ allows selection via external configuration resistors without firmware changes.
How is VR B phase configuration implemented on the ISL95857AIRTZ?
VR B phase count on the ISL95857AIRTZ is configured using an external resistor connected to the PHASE_B pin: a specific resistance value selects 2-phase mode, while another value selects 1-phase mode. This resistor-programmable option enables hardware-level scalability without modifying firmware or replacing the ISL95857AIRTZ, making it ideal for platforms targeting both integrated and discrete GPU implementations.
What role does the PSYS_IN pin play in the ISL95857AIRTZ?
The PSYS_IN pin on the ISL95857AIRTZ is an analog input that accepts a voltage proportional to total system input power, typically sourced from an external current-sense amplifier. It enables the ISL95857AIRTZ to support Intel's PSYS monitoring requirement for platform-level power telemetry, allowing firmware to implement dynamic thermal and power budgeting-critical for fanless and battery-constrained devices using the ISL95857AIRTZ.
Is the ISL95857AIRTZ compatible with DrMOS power stages?
Yes, the ISL95857AIRTZ provides dedicated PWM outputs fully compatible with Intel-compliant DrMOS power stages, as well as discrete buck stages driven by controllers like the ISL95808. Its gate drive timing, dead-time control, and SVID synchronization are optimized for DrMOS integration, and the ISL95857AIRTZ is explicitly validated for use with industry-standard DrMOS devices in IMVP8™ reference designs.
ISL95857AIRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for ISL95857AIRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857AIRTZ 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 reliable?
The price and inventory of ISL95857AIRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857AIRTZ is usually 5 days.
3.What payment methods are accepted for ISL95857AIRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857AIRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857AIRTZ?
ISL95857AIRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857AIRTZ 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?
For technical support, including ISL95857AIRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857AIRTZ requirements.
6.How does Aetrix verify that ISL95857AIRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95857AIRTZ 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 meets industry standards.
7.What is the process for return or replacement of ISL95857AIRTZ?
All ISL95857AIRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857AIRTZ, 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 part is unused and in its original packaging.
Return procedure for ISL95857AIRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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