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Renesas ISL95857CIRTZ-T
- Part No.:
- ISL95857CIRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857CIRTZ-T.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,557
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Product details
Overview
ISL95857CIRTZ-T from Renesas (formerly Intersil) is a 1+2+1-phase voltage regulator controller for Intel IMVP8-compliant CPUs, delivering precise core (VR A), graphics (VR B), and system agent (VR C) rail regulation with 0.5% system accuracy over temperature, PS4 power-state support, and R3™ modulator technology enabling fast transient response and diode emulation mode.
For engineers reviewing the ISL95857CIRTZ-T datasheet, ISL95857CIRTZ-T pinout, ISL95857CIRTZ-T application, or ISL95857CIRTZ-T equivalent, key selection criteria include VR phase configurability (VR B supports 1- or 2-phase), SVID interface compliance, DCR/resistor current sensing flexibility, remote differential voltage sensing, and IMVP8 PSYS monitoring capability.
Technical Context
The ISL95857CIRTZ-T implements a three-output IMVP8 SVID controller with independent load-line programming per rail (VR A: 2.4 mΩ, VR B: 2 mΩ, VR C: 10.3 mΩ) and shared serial bus communication to reduce board area versus dual-chip solutions. It integrates Robust Ripple Regulator (R3™) modulation for variable-frequency operation during transients and diode emulation at light loads.
It supports both lossless DCR current sensing with single NTC thermistor compensation and high-precision resistor-based sensing. All outputs feature programmable IMAX, adjustable switching frequency, overcurrent protection, and a unified VR_READY signal, while complying fully with IMVP8 PS4 entry/exit timing and power-domain requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Architecture | 1+2+1-phase VR controller supporting VR A (1-phase), VR B (configurable 1-/2-phase), VR C (1-phase) |
| IMVP8 Compliance | Fully compliant with Intel IMVP8 specification including PS4 power-state entry/exit and SVID interface protocol |
| System Accuracy | ±0.5% over temperature, enabling tight CPU rail tolerance for CFL/CNL processors |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and precision resistor sensing per output |
| Load-Line Setting | Programmable per rail: VR A = 2.4 mΩ, VR B = 2 mΩ, VR C = 10.3 mΩ |
| Modulation Technology | R3™ (Robust Ripple Regulator) enabling variable switching frequency and diode emulation mode |
| PSYS Monitoring | Integrated system input power monitor support per IMVP8 specification |
Pinout & Package
ISL95857CIRTZ-T 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 ISL95857C datasheet Rev. 0.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 5 V to 24 V input for internal LDOs and bias circuitry |
| VDDIO | I/O supply | Provides 3.3 V supply for SVID interface and logic circuits |
| SVID_DATA / SVID_CLK | SVID serial interface | Two-wire bidirectional bus for communication with Intel CPU |
| VR_A_PGOOD / VR_B_PGOOD / VR_C_PGOOD | Per-rail power-good status | Open-drain outputs indicating individual VR rail stability |
| VR_READY | Unified power-good indicator | Single active-high signal confirming all three VR outputs are within regulation |
| PSYS_IN | System input power monitor input | Analog input for external shunt or sense resistor to enable IMVP8 PSYS reporting |
| NTC_IN | Thermistor input | Connects to single NTC for DCR temperature compensation across all rails |
| REFIN | Reference input | Differential remote sense input for VR A (core) rail |
| REFINB | Reference input | Differential remote sense input for VR B (graphics) rail |
| REFINC | Reference input | Differential remote sense input for VR C (system agent) rail |
Key Features
| Feature | Design Value |
|---|---|
| Three independent VR outputs | Enables discrete optimization of core, graphics, and system agent rails with separate load-line and IMAX settings |
| VR B phase configurability | Allows flexible PCB layout and power-stage selection-1-phase for low-power designs or 2-phase for higher-current graphics rails |
| R3™ modulator architecture | Delivers faster transient settling and improved light-load efficiency via diode emulation and adaptive frequency scaling |
| Dual current-sensing options | Supports cost-optimized DCR sensing or high-accuracy resistor sensing without redesigning the control loop |
| PS4 state ultra-low ICC | Minimizes standby power consumption during deep sleep states required by IMVP8 mobile platforms |
Applications
| Intel CFL Notebook Power Delivery | Intel CNL Desktop VRM |
|---|---|
Use Scenario: Thin-and-light notebook platform using Intel Coffee Lake (CFL) CPU requiring strict IMVP8 compliance and PS4 power-state support. IC Role / Device Role / Timing Role: Primary 1+2+1-phase VR controller managing VCORE (VR A), VGT (VR B), and VSA (VR C) rails with differential remote sensing and dynamic load-line adjustment. Use Value: Enables ±0.5% rail accuracy and seamless PS4 entry/exit-critical for battery life and thermal management in fanless designs. | Use Scenario: High-performance desktop motherboard targeting Intel Cannon Lake (CNL) processors with multi-rail power sequencing demands. IC Role / Device Role / Timing Role: Centralized SVID controller coordinating three independent VR outputs while sharing serial bus resources to minimize component count. Use Value: Reduces BOM cost and PCB area versus dual-controller implementations while maintaining per-rail programmability and PSYS monitoring. |
| Ultrabook System Agent Regulation | Tablet Platform Graphics Rail Control |
Use Scenario: Fanless Ultrabook requiring stable system agent (VSA) voltage under variable memory and I/O loading conditions. IC Role / Device Role / Timing Role: VR C output delivers tightly regulated VSA rail with 10.3 mΩ load line and remote sensing to compensate for PCB IR drop. Use Value: Ensures reliable PCIe link training and memory controller operation despite trace resistance and thermal drift. | Use Scenario: Convertible tablet with dynamic GPU workload requiring rapid voltage scaling and transient response. IC Role / Device Role / Timing Role: VR B output configured as 2-phase controller driving discrete or DrMOS stages for VGT rail with 2 mΩ load line and R3™ modulation. Use Value: Achieves sub-10 µs transient recovery and >90% light-load efficiency via diode emulation-extending active usage time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase VR 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 'C' suffix denotes non-automotive grade) | No functional difference-used interchangeably in commercial notebooks/desktops where AEC-Q200 not required | Select ISL95857IRTZ-T when automotive qualification is unnecessary and cost sensitivity favors standard-grade variant |
| RT8803AGQW | 3-phase VR controller with integrated MOSFET drivers; lacks PSYS support and IMVP8 PS4 compliance | Targeted at generic multi-core SoC platforms-not validated for Intel CFL/CNL CPUs or SVID timing requirements | Choose RT8803AGQW only for non-Intel applications where SVID interface and PS4 state handling are not required |
Compared with ISL95857CIRTZ-T, ISL95857IRTZ-T offers identical functionality at lower cost for non-automotive use, while RT8803AGQW provides driver integration but sacrifices IMVP8 compliance-making it unsuitable for Intel CFL/CNL CPU power delivery without firmware and layout revalidation.
Availability
ISL95857CIRTZ-T is available at Aetrix Electronics and suitable for Intel CFL/CNL notebook, Ultrabook, desktop, and tablet platforms requiring stable component supply, IMVP8 compliance, and PS4 power-state support.
Supply support for ISL95857CIRTZ-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 for computing, industrial, and automotive markets.
The ISL95857CIRTZ-T belongs to Renesas' IMVP8 VR controller product line, engineered specifically for Intel 8th- and 10th-gen mobile and desktop CPU power delivery with emphasis on accuracy, transient response, and PS4 efficiency.
FAQ
What is the primary function of the ISL95857CIRTZ-T in an Intel CPU power system?
The ISL95857CIRTZ-T serves as a dedicated 1+2+1-phase voltage regulator controller for Intel IMVP8-compliant processors. It manages three independent power rails-VCORE (VR A), VGT (VR B), and VSA (VR C)-using SVID communication, differential remote sensing, and R3™ modulation. Its design ensures ±0.5% system accuracy and full PS4 power-state compliance, making ISL95857CIRTZ-T essential for stable, efficient CPU power delivery in CFL and CNL platforms.
Does the ISL95857CIRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95857CIRTZ-T supports dual 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 modes are configurable per output and do not require changes to the ISL95857CIRTZ-T's internal control loop-enabling flexible BOM optimization without sacrificing regulation performance.
How does the R3™ modulation in the ISL95857CIRTZ-T improve transient response?
The R3™ (Robust Ripple Regulator) modulation in the ISL95857CIRTZ-T enables variable switching frequency that increases during load transients-reducing output voltage deviation-and decreases at light loads via diode emulation mode. This architecture achieves faster transient settling time and higher light-load efficiency than fixed-frequency PWM controllers, directly enhancing ISL95857CIRTZ-T's suitability for dynamic CPU workloads in mobile platforms.
Can the VR B output of the ISL95857CIRTZ-T be configured for 2-phase operation?
Yes, the VR B output of the ISL95857CIRTZ-T is explicitly configurable for either 1-phase or 2-phase operation, as confirmed in the FN8968 datasheet. This flexibility allows designers to scale power delivery for graphics-intensive workloads while maintaining compatibility with the same ISL95857CIRTZ-T footprint and firmware-unlike VR A and VR C, which are fixed at 1-phase operation.
What is the purpose of the PSYS input on the ISL95857CIRTZ-T?
The PSYS_IN pin on the ISL95857CIRTZ-T enables system input power monitoring per Intel IMVP8 specification. It accepts an analog voltage proportional to total platform input power (e.g., from a shunt resistor), allowing the CPU to report real-time power consumption for thermal and power budgeting. This feature is mandatory for IMVP8 PS4 compliance and distinguishes ISL95857CIRTZ-T from generic VR controllers lacking PSYS support.
ISL95857CIRTZ-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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857CIRTZ-T FAQ
1.How can I place an order for ISL95857CIRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857CIRTZ-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 ISL95857CIRTZ-T reliable?
The price and inventory of ISL95857CIRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857CIRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95857CIRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857CIRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857CIRTZ-T?
ISL95857CIRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857CIRTZ-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 ISL95857CIRTZ-T?
For technical support, including ISL95857CIRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857CIRTZ-T requirements.
6.How does Aetrix verify that ISL95857CIRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95857CIRTZ-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 ISL95857CIRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95857CIRTZ-T?
All ISL95857CIRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857CIRTZ-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 ISL95857CIRTZ-T part is unused and in its original packaging.
Return procedure for ISL95857CIRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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