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Renesas ISL95857CHRTZ
- Part No.:
- ISL95857CHRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857CHRTZ.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,887
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Product details
Overview
ISL95857CHRTZ 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 for light-load efficiency.
For engineers reviewing the ISL95857CHRTZ datasheet, ISL95857CHRTZ pinout, ISL95857CHRTZ application, or ISL95857CHRTZ equivalent, key selection criteria include IMVP8 SVID compliance, three-rail independent control with VR B phase configurability, DCR/resistor current sensing flexibility, remote differential voltage sensing, and programmable IMAX/switching frequency via external resistors.
Technical Context
The ISL95857CHRTZ implements a Robust Ripple Regulator (R3™) modulator architecture that dynamically adjusts switching frequency during load transients to minimize output voltage deviation, while supporting both DrMOS and discrete MOSFET driver topologies via PWM outputs. It integrates a shared serial SVID bus for CPU communication across all three VR outputs, reducing component count versus dual-controller solutions.
It supports Intel PS4 low-power state entry/exit with low quiescent current, enables system input power monitoring (PSYS), and provides configurable current sensing-either lossless inductor DCR sensing with single NTC thermistor compensation or high-precision resistor-based sensing-with independent remote sense per rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Architecture | R3™ modulator with variable-frequency transient response and diode emulation mode for optimized light-load efficiency |
| Output Configuration | Three independent VRs: VR A (1-phase only), VR B (1- or 2-phase configurable), VR C (1-phase only) |
| System Accuracy | ±0.5% over temperature - ensures tight voltage tolerance for IMVP8 CPU core, graphics, and SA rails |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and precision resistor sensing - enables design flexibility and thermal accuracy |
| SVID Compliance | Fully compliant with Intel IMVP8 serial interface - enables direct CPU communication for dynamic VID updates and telemetry |
| PS4 Support | Meets IMVP8 PS4 power domain requirements - guarantees low supply current and controlled entry/exit sequencing |
| Remote Sensing | Differential remote voltage sense per VR output - eliminates PCB trace IR drop errors for stable regulation at point-of-load |
Pinout & Package
ISL95857CHRTZ is housed in a 40-pin QFN package (6mm × 6mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95857C datasheet Rev. 0.00 (Oct 2017), with dedicated SVID bus lines, PWM outputs for each VR, current sense inputs, remote sense pairs, and configuration pins for address, IMAX, and frequency setting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Controller supply input | Accepts 5V to 25V input to power internal circuitry and gate drivers |
| SVID_DATA / SVID_CLK | Intel SVID serial interface | Two-wire bidirectional bus for CPU-to-controller command and telemetry exchange |
| PHASE_A / PHASE_B / PHASE_C | PWM outputs | Three independent PWM signals driving DrMOS or external MOSFET drivers per VR rail |
| VSNSA+/VSNSA−, etc. | Differential remote sense inputs | Four pairs (one per VR + common) enable accurate point-of-load voltage feedback |
| IMON_A/B/C | Current sense inputs | Accepts DCR-derived or resistor-derived analog current signals for per-rail OCP and loadline programming |
| ADDR0–ADDR2 | Address configuration | Resistor-programmable SVID address selection for multi-controller systems |
Key Features
| Feature | Design Value |
|---|---|
| 1+2+1 VR topology support | Enables simultaneous regulation of CPU core (1-phase), graphics (1- or 2-phase), and system agent (1-phase) rails under IMVP8 |
| Programmable IMAX per VR | External resistor sets overcurrent threshold independently for each rail - improves fault margin and thermal management |
| Adjustable switching frequency | Resistor-selected base frequency (200–1000 kHz) with R3™ dynamic scaling - balances efficiency, size, and transient performance |
| PSYS system power monitor | Integrated input power calculation using VIN and total current - supports platform-level power budgeting and thermal throttling |
| VR_READY indicator | Single open-drain signal confirms all three VRs meet power-good criteria - simplifies system power sequencing logic |
Applications
| Thin-and-Light Notebook Power | Ultrabook VR Management |
|---|---|
Use Scenario: High-efficiency, space-constrained power delivery for 15W–45W Intel CFL/CNL processors in sub-15mm chassis. IC Role / Device Role / Timing Role: Primary IMVP8 controller managing VCORE, VGT, and VSA rails with integrated PS4 support and dynamic loadline tuning. Use Value: Enables aggressive power gating and rapid PS4 entry/exit to extend battery life without compromising transient response on any rail. | Use Scenario: Dual-rail coordination in fanless Ultrabooks requiring silent operation and strict thermal envelope adherence. IC Role / Device Role / Timing Role: Three-output controller synchronizing VR A, B, and C timing with shared SVID bus and unified VR_READY assertion. Use Value: Eliminates need for secondary controllers, reducing BOM cost and PCB area while maintaining per-rail remote sensing and DCR thermal compensation. |
| Desktop IMVP8 Reference Design | Tablet Platform Power Subsystem |
Use Scenario: Reference board implementation for Intel desktop CPUs where layout simplicity and validation speed are critical. IC Role / Device Role / Timing Role: Centralized VR controller providing configurable phase assignment (VR B as 2-phase) and resistor-programmed parameters for rapid prototyping. Use Value: External resistor configuration of IMAX, frequency, and address accelerates design iteration and eliminates firmware dependency during bring-up. | Use Scenario: Compact tablet platforms with limited board space and stringent EMI requirements. IC Role / Device Role / Timing Role: Single-chip solution delivering regulated core, GPU, and SA voltages with differential remote sensing to counteract flex-circuit voltage drop. Use Value: Maintains ±0.5% regulation accuracy despite long, thin interconnects - essential for stable SoC operation under dynamic workloads. |
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 |
|---|---|---|---|
| ISL95855HRTZ | 2+1+1 VR configuration (VR A/B = 2-phase, VR C = 1-phase); identical R3™ modulator and SVID interface | Optimized for higher-current core + graphics loads; lacks VR B phase configurability | Select when fixed 2-phase core and graphics rails are required, and VR B phase flexibility is unnecessary |
| RT8803AZQW | 3-phase single-rail controller (not 1+2+1); supports IMVP8 but uses separate controllers per rail | Requires two ICs for full IMVP8 3-rail support; no shared SVID bus or unified VR_READY | Choose only if modular rail design or discrete phase control per rail is preferred over integrated 3-output architecture |
Compared with ISL95857CHRTZ, the ISL95855HRTZ offers higher per-rail phase count but less topology flexibility, while the RT8803AZQW requires duplicated control logic and increases board complexity - making ISL95857CHRTZ optimal for compact, cost-sensitive IMVP8 platforms needing coordinated 3-rail regulation.
Availability
ISL95857CHRTZ is available at Aetrix Electronics and suitable for Intel CFL/CNL notebook, Ultrabook, desktop, and tablet designs requiring stable component supply, IMVP8 compliance, and integrated three-rail voltage regulation with PS4 support.
Supply support for ISL95857CHRTZ 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 ISL95857CHRTZ belongs to Renesas' IMVP8-compliant multiphase controller product line, engineered specifically for energy-efficient, thermally constrained client computing platforms with dynamic CPU power states.
FAQ
What is the primary function of the ISL95857CHRTZ in an Intel IMVP8 system?
The ISL95857CHRTZ serves as a 1+2+1-phase voltage regulator controller that manages three independent power rails - VCORE (VR A), VGT (VR B), and VSA (VR C) - for Intel CFL/CNL CPUs. It implements R3™ modulation, supports SVID communication with the CPU, enforces IMVP8 PS4 requirements, and delivers ±0.5% system accuracy. Its integrated design replaces multiple discrete controllers, making ISL95857CHRTZ ideal for space- and cost-sensitive client platforms.
Does the ISL95857CHRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95857CHRTZ supports dual current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for thermal accuracy, and precision resistor-based sensing for higher measurement fidelity. Each VR output (A, B, C) has dedicated IMON inputs, allowing designers to select the optimal method per rail. This flexibility ensures robust overcurrent protection and accurate loadline programming across operating conditions in ISL95857CHRTZ implementations.
How is phase configuration handled for VR B in the ISL95857CHRTZ?
VR B in the ISL95857CHRTZ is uniquely configurable for either 1-phase or 2-phase operation via hardware configuration pins - unlike VR A and VR C, which are fixed at 1-phase. This allows designers to scale graphics rail current capacity without changing the controller IC. The configuration is set at power-on and remains static during operation, ensuring predictable timing and loop stability. This capability makes ISL95857CHRTZ adaptable across multiple CFL/CNL SKUs with varying GPU power demands.
What role does the PSYS feature play in the ISL95857CHRTZ?
The PSYS (system input power monitor) feature in the ISL95857CHRTZ calculates total input power by combining VIN and summed current measurements across all three VRs. This enables real-time platform-level power budgeting, thermal throttling decisions, and compliance reporting - critical for fanless or thermally constrained devices. PSYS data is accessible via the SVID bus, allowing the CPU or EC to act on system-level power trends. No external power monitor IC is needed when using ISL95857CHRTZ with PSYS enabled.
Can the ISL95857CHRTZ be used in non-Intel platforms?
The ISL95857CHRTZ is architecturally designed for Intel IMVP8 compliance, including SVID protocol, PS4 state timing, and loadline definitions specific to CFL/CNL CPUs. While its PWM outputs and basic regulation could theoretically drive non-Intel loads, features like VR_READY assertion, SVID telemetry, and PSYS integration rely on Intel-specific signaling and timing. Therefore, ISL95857CHRTZ is not recommended or validated for non-Intel platforms - use only in IMVP8-compliant systems as specified in the FN8968 datasheet.
ISL95857CHRTZ 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:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857CHRTZ FAQ
1.How can I place an order for ISL95857CHRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857CHRTZ 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 ISL95857CHRTZ reliable?
The price and inventory of ISL95857CHRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857CHRTZ is usually 5 days.
3.What payment methods are accepted for ISL95857CHRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857CHRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857CHRTZ?
ISL95857CHRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857CHRTZ 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 ISL95857CHRTZ?
For technical support, including ISL95857CHRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857CHRTZ requirements.
6.How does Aetrix verify that ISL95857CHRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95857CHRTZ 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 ISL95857CHRTZ meets industry standards.
7.What is the process for return or replacement of ISL95857CHRTZ?
All ISL95857CHRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857CHRTZ, 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 ISL95857CHRTZ part is unused and in its original packaging.
Return procedure for ISL95857CHRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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