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Renesas ISL95857CIRTZ
- Part No.:
- ISL95857CIRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857CIRTZ.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,297
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Product details
Overview
ISL95857CIRTZ from Renesas (formerly Intersil) is a 3-output IMVP8-compliant voltage regulator controller for Intel CFL/CNL CPUs, delivering core (VR A), graphics (VR B), and system agent (VR C) rail regulation with 0.5% system accuracy over temperature, PS4 power-state compliance, and support for DCR/resistor current sensing.
For engineers reviewing the ISL95857CIRTZ datasheet, ISL95857CIRTZ pinout, ISL95857CIRTZ application, or ISL95857CIRTZ equivalent, key selection criteria include VR phase configurability (VR B supports 1- or 2-phase), R3™ modulator transient response, SVID serial bus interface, PSYS monitoring capability, and compatibility with DrMOS or discrete buck stages using ISL95808 drivers.
Technical Context
The ISL95857CIRTZ implements Intel IMVP8 protocol via SVID interface, managing three independent VR outputs with shared serial control bus to reduce board area and cost. It uses Robust Ripple Regulator (R3™) technology enabling variable switching frequency, diode emulation mode for light-load efficiency, and fast transient settling.
Each output features differential remote sensing, programmable IMAX, adjustable switching frequency, OC protection, and a unified VR_READY signal. VR B supports dynamic reconfiguration between 1- and 2-phase operation, while VR A and VR C are fixed 1-phase - all configured via resistor-programmable address and load-line parameters (e.g., VR A = 2.4 mΩ, VR B = 2.0 mΩ, VR C = 10.3 mΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Outputs | Three independent VRs: VR A (1-phase), VR B (1-/2-phase configurable), VR C (1-phase) |
| IMVP8 Compliance | Fully compliant including PS4 entry/exit, SVID interface, and VR_READY signaling |
| System Accuracy | ±0.5% over temperature ensures tight CPU rail tolerance for CFL/CNL processors |
| Current Sensing | Supports lossless DCR sensing with single NTC thermistor or precision resistor-based sensing |
| R3™ Modulator | Enables variable-frequency operation and diode emulation mode for improved light-load efficiency |
| PSYS Monitoring | Integrated system input power monitor function per IMVP8 specification |
| Load-Line Setting | Resistor-programmable: VR A = 2.4 mΩ, VR B = 2.0 mΩ, VR C = 10.3 mΩ |
Pinout & Package
ISL95857CIRTZ is housed in a 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95857C datasheet (FN8968), with dedicated SVID bus lines, PWM outputs for each VR, sense inputs, and configuration resistors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 5 V to 24 V input for internal LDOs and bias circuitry |
| SVID_CLK / SVID_DATA | Serial interface signals | Two-wire SVID bus connecting to Intel CPU for VR configuration and telemetry |
| VR_A_PWM / VR_B_PWM / VR_C_PWM | PWM outputs | Drive external DrMOS or discrete buck stages (e.g., paired with ISL95808) |
| VSNSA+/VSNSA− / VSNSB+/VSNSB− / VSNSC+/VSNSC− | Differential remote sense | Enable accurate load-point regulation by compensating for PCB IR drop |
| IMAX_A/B/C | Current limit programming | Resistor-connected pins setting overcurrent thresholds per VR output |
| VR_READY | Power-good indicator | Open-drain signal asserting when all three VRs meet regulation and sequencing requirements |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Architecture | Delivers faster transient response and variable-frequency operation without external compensation |
| PS4 Power-State Support | Enables ultra-low quiescent current during deep sleep, meeting IMVP8 PS4 entry/exit timing |
| Configurable VR B Phase Count | Allows dynamic hardware reconfiguration between 1- and 2-phase operation for graphics rail scalability |
| Unified SVID Control Bus | Reduces component count and routing complexity versus dual-controller solutions |
| Programmable Load-Line Resistors | Permits precise DC droop tuning for VR A (2.4 mΩ), VR B (2.0 mΩ), VR C (10.3 mΩ) |
Applications
| High-Performance Notebook CPU Power | Ultrabook Graphics Rail Regulation |
|---|---|
Use Scenario: Power delivery for Intel Core i7-8xxx CFL processors in thin-and-light notebooks requiring strict IMVP8 compliance and PS4 state support. IC Role / Device Role / Timing Role: Primary 3-rail VR controller managing VCORE (VR A), VGT (VR B), and VSA (VR C) with synchronized SVID communication. Use Value: Enables <1% total rail error across temperature and load, satisfying Intel's ±0.5% system accuracy requirement for stable CPU operation. | Use Scenario: Dedicated graphics voltage regulation in dual-GPU or discrete-integrated hybrid systems using CNL platform CPUs. IC Role / Device Role / Timing Role: Configurable VR B output operating in 2-phase mode to deliver up to 60 A to GPU subsystem with adaptive load-line droop. Use Value: Achieves <20 µs transient response to GPU load steps while maintaining PSYS monitoring for system-level power budgeting. |
| Desktop Platform System Agent Supply | Tablet Platform Low-Power VR Management |
Use Scenario: Stable VSA rail generation for Intel H310/C246 chipset-based desktop motherboards with multi-phase VR design constraints. IC Role / Device Role / Timing Role: VR C output delivering regulated 1.05 V at ≤15 A with 10.3 mΩ load-line slope and remote sensing. Use Value: Eliminates need for separate VSA controller, reducing BOM cost and PCB area by integrating all three rails into single IC. | Use Scenario: Compact power solution for fanless Windows tablets using CFL-U processors with thermal envelope limitations. IC Role / Device Role / Timing Role: Full IMVP8 controller operating in low-IQ PS4 mode during display-off states, leveraging R3™ diode emulation for >85% efficiency at 100 mA load. Use Value: Extends battery life by minimizing idle power loss while maintaining rapid wake-up from PS4 via SVID handshake. |
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 | Same die, identical electrical specs; differs only in tape-and-reel packaging (no functional difference) | No impact on board design or firmware - interchangeable in all IMVP8 systems | Select ISL95857IRTZ for automated SMT assembly where reel packaging is required |
| RTQ2136GSP-QA | Automotive-grade 3-output IMVP8 controller with AEC-Q100 qualification; higher PS4 leakage spec and extended temp range (−40°C to +125°C) | Targeted for automotive infotainment CPUs, not consumer notebooks or tablets | Choose RTQ2136GSP-QA only when AEC-Q100 compliance and extended temperature operation are mandatory |
Compared with ISL95857CIRTZ, ISL95857IRTZ offers identical performance in different packaging, while RTQ2136GSP-QA trades consumer-grade cost optimization for automotive reliability - making ISL95857CIRTZ optimal for high-volume CFL/CNL notebook platforms where IMVP8 timing, PSYS, and R3™ transient response are critical.
Availability
ISL95857CIRTZ is available at Aetrix Electronics and suitable for high-volume notebook, Ultrabook, desktop motherboard, and tablet power designs requiring stable component supply, IMVP8 compliance, and PS4 power-state support.
Supply support for ISL95857CIRTZ 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 full product continuity, quality systems (ISO 9001), and technical support for legacy Intersil power management ICs.
The ISL95857CIRTZ belongs to Renesas' IMVP8 VR controller family, engineered specifically for Intel client CPU platforms requiring tightly coordinated multi-rail regulation, SVID telemetry, and ultra-low-power PS4 operation.
FAQ
What is the primary function of the ISL95857CIRTZ in an Intel CFL/CNL platform?
The ISL95857CIRTZ serves as the central 3-output voltage regulator controller for Intel CFL/CNL CPUs, managing VCORE (VR A), VGT (VR B), and VSA (VR C) rails under IMVP8 protocol. It executes SVID communication, implements R3™ modulation for fast transients, enforces PS4 power-state compliance, and provides unified VR_READY signaling - all within a single 48-pin QFN package.
Does the ISL95857CIRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95857CIRTZ supports dual current sensing methods: lossless inductor DCR sensing with single NTC thermistor for temperature compensation, and precision resistor-based sensing for higher accuracy where board space permits. Both methods are fully supported across all three VR outputs (VR A, VR B, VR C) and configured independently per rail.
How does the R3™ modulator in the ISL95857CIRTZ improve power delivery performance?
The R3™ modulator in the ISL95857CIRTZ enables variable switching frequency during load transients and diode emulation mode at light loads, resulting in faster transient settling time (<20 µs), improved light-load efficiency (>85% at 100 mA), and elimination of external loop compensation components - directly enhancing CPU rail stability and battery life in mobile platforms.
Can VR B on the ISL95857CIRTZ operate in both 1-phase and 2-phase configurations?
Yes, VR B on the ISL95857CIRTZ is explicitly configurable for either 1-phase or 2-phase operation via external resistor selection, allowing flexible graphics rail design for varying GPU power demands. VR A and VR C are fixed 1-phase outputs. This configurability is documented in the FN8968 datasheet and validated in reference designs for CFL/CNL platforms.
What is the significance of the PSYS monitoring feature in the ISL95857CIRTZ?
The PSYS monitoring feature in the ISL95857CIRTZ provides real-time measurement of total system input power, as required by Intel IMVP8 for platform-level power budgeting and thermal management. It interfaces with the CPU via SVID to report cumulative power draw across all VRs, enabling dynamic power capping and optimized thermal throttling in notebooks and Ultrabooks.
ISL95857CIRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857CIRTZ FAQ
1.How can I place an order for ISL95857CIRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857CIRTZ 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 ISL95857CIRTZ reliable?
The price and inventory of ISL95857CIRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857CIRTZ is usually 5 days.
3.What payment methods are accepted for ISL95857CIRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857CIRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857CIRTZ?
ISL95857CIRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857CIRTZ 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 ISL95857CIRTZ?
For technical support, including ISL95857CIRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857CIRTZ requirements.
6.How does Aetrix verify that ISL95857CIRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95857CIRTZ 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 ISL95857CIRTZ meets industry standards.
7.What is the process for return or replacement of ISL95857CIRTZ?
All ISL95857CIRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857CIRTZ, 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 ISL95857CIRTZ part is unused and in its original packaging.
Return procedure for ISL95857CIRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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