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Renesas ISL95857CHRTZ-T
- Part No.:
- ISL95857CHRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857CHRTZ-T.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,023
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Product details
Overview
ISL95857CHRTZ-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 for light-load efficiency.
For engineers reviewing the ISL95857CHRTZ-T datasheet, ISL95857CHRTZ-T pinout, ISL95857CHRTZ-T application, or ISL95857CHRTZ-T equivalent, key selection considerations include VR phase configurability (VR B supports 1- or 2-phase), SVID serial bus compliance, DCR/resistor current sensing options, remote differential voltage sensing, and IMVP8 PSYS input power monitoring capability.
Technical Context
The ISL95857CHRTZ-T implements a Robust Ripple Regulator (R3™) modulator architecture that dynamically adjusts switching frequency during load transients to minimize output voltage deviation, while supporting diode emulation mode to reduce switching losses below ~1A load. It integrates three independent VR control channels sharing a single SVID interface to the CPU.
All three outputs-VR A (1-phase only), VR B (1-/2-phase configurable), and VR C (1-phase only)-feature programmable IMAX, adjustable switching frequency, overcurrent protection, and a unified VR_READY signal. Current sensing is supported via lossless DCR with single NTC thermistor compensation or high-precision resistor-based sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | 1+2+1-phase IMVP8 VR controller for VCORE/VR A, VGT/VR B, VSA/VR C rails |
| System Accuracy | ±0.5% over temperature - ensures tight CPU voltage tolerance across operating range |
| Modulator Technology | R3™ (Robust Ripple Regulator) - enables variable-frequency transient response and diode emulation mode |
| Current Sensing | DCR with single NTC compensation or precision resistor sensing - supports accurate thermal-aware current measurement |
| PS4 Support | Full entry/exit compliance - meets Intel's deepest low-power state requirements for mobile platforms |
| Remote Sensing | Differential voltage sense per VR - eliminates PCB trace IR drop impact on regulation accuracy |
| PSYS Monitoring | System input power monitor interface - enables platform-level power budgeting and thermal management |
Pinout & Package
ISL95857CHRTZ-T 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 (FN8968 Rev.0.00).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 5V–21V input for internal LDOs and bias circuitry |
| VDDIO | I/O supply | Provides 3.3V supply for SVID interface and logic circuits |
| SVID_CLK / SVID_DATA | SVID serial bus interface | Two-wire CPU-to-controller communication for VR configuration and telemetry |
| VR_A_PGOOD / VR_B_PGOOD / VR_C_PGOOD | Per-rail power-good status | Open-drain outputs indicating individual VR rail stability (combined into VR_READY) |
| IMON_A / IMON_B / IMON_C | Current sense inputs | Differential inputs for DCR or resistor-based current sensing per VR channel |
| VSNS_A / VSNS_B / VSNS_C | Remote voltage sense inputs | Differential inputs for remote feedback to compensate PCB trace resistance |
| PSYS | System input power monitor | Analog input accepting scaled system input power signal for platform-level power tracking |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Architecture | Delivers sub-10µs transient response and adaptive frequency scaling to maintain regulation under dynamic CPU load changes |
| VR B Phase Configurability | Hardware-selectable 1- or 2-phase operation enables flexible power stage sizing for VGT rail without redesign |
| Programmable SVID Address | Resistor-set address allows multiple ISL95857CHRTZ-T controllers on same SVID bus for multi-CPU or complex SoC designs |
| PS4 Power-State Optimization | Ultra-low quiescent current in PS4 reduces idle power consumption in modern ultrabook and tablet platforms |
| Differential Remote Sensing | Eliminates up to 25mV of voltage error caused by PCB trace resistance, critical for sub-1V CPU rail accuracy |
Applications
| Intel CFL/CNL Notebook Power Delivery | Ultrabook VRM Reference Design |
|---|---|
Use Scenario: High-efficiency 1+2+1 VRM powering 8th/10th-gen Intel Core processors in thin-and-light notebooks with dual-channel DDR4 and discrete GPU support. IC Role / Device Role / Timing Role: Primary IMVP8-compliant voltage regulator controller managing VCORE, VGT, and VSA rails with coordinated SVID telemetry and PSYS monitoring. Use Value: Enables PS4 entry within 50µs and maintains ±0.5% rail accuracy across -10°C to +85°C ambient, directly supporting Intel's mobile power certification. | Use Scenario: Reference VRM implementation for OEMs developing fanless Ultrabooks requiring minimal solution size and ultra-low standby power. IC Role / Device Role / Timing Role: Central VR controller integrating three independent regulation loops, shared SVID interface, and thermal-compensated DCR sensing. Use Value: Reduces component count by 30% vs. discrete dual-controller solutions and cuts PS4 quiescent current to <150µA, extending battery life in always-on scenarios. |
| IMVP8 Desktop Motherboard VRM | Tablet Platform System Agent Regulation |
Use Scenario: Compact VRM design for mini-ITX desktop motherboards targeting Intel Coffee Lake Refresh CPUs with integrated graphics. IC Role / Device Role / Timing Role: Single-chip controller delivering VCORE (1-phase), VGT (2-phase), and VSA (1-phase) with unified VR_READY signaling and load-line programming. Use Value: Supports 2.4mΩ (VCORE), 2mΩ (VGT), and 10.3mΩ (VSA) load lines per Intel spec, ensuring stable operation under burst workloads up to 60A peak. | Use Scenario: Low-power system agent rail regulation in 10-inch Windows tablets with LTE connectivity and active cooling constraints. IC Role / Device Role / Timing Role: Dedicated VR C channel regulating VSA rail at 0.85–1.05V with programmable IMAX and remote sensing to counteract flex-cable voltage drop. Use Value: Achieves 0.5% accuracy at 3A load with differential sensing, preventing SA timeout errors during sustained multi-tasking sessions. |
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 |
|---|---|---|---|
| ISL95857HRTZ-T | Same pinout and function but rated for extended temperature range (–40°C to +105°C vs. –40°C to +85°C) | Required for industrial or automotive-adjacent notebook designs with higher ambient thermal stress | Select ISL95857HRTZ-T when board-level operating temperature exceeds 85°C ambient |
| RTQ2136BGE | Single 3+1-phase IMVP8 controller with integrated drivers; no external DrMOS required; different SVID timing and PSYS implementation | Targets cost-sensitive designs where driver integration reduces BOM count and layout area | Choose RTQ2136BGE only if DrMOS-free topology and simplified layout outweigh need for PSYS monitoring and R3™ transient performance |
Compared with ISL95857HRTZ-T, the ISL95857CHRTZ-T offers identical functionality at lower thermal rating, while RTQ2136BGE trades off PSYS support and R3™ responsiveness for driver integration-making ISL95857CHRTZ-T optimal for performance-focused IMVP8 platforms needing precise power telemetry and fast transient recovery.
Availability
ISL95857CHRTZ-T is available at Aetrix Electronics and suitable for Intel CFL/CNL notebook, Ultrabook, desktop motherboard, and tablet platform designs requiring stable component supply, IMVP8 compliance, and PS4 power-state support.
Supply support for ISL95857CHRTZ-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 continues its high-performance analog and power management IC portfolio with ISO 9001-certified manufacturing and rigorous reliability validation.
The ISL95857CHRTZ-T belongs to Renesas' IMVP8-compliant VR controller product line, engineered specifically for Intel client CPU power delivery in space-constrained, thermally demanding mobile platforms.
FAQ
What is the primary function of the ISL95857CHRTZ-T in an Intel IMVP8 system?
The ISL95857CHRTZ-T serves as a dedicated 1+2+1-phase voltage regulator controller managing the VCORE (VR A), VGT (VR B), and VSA (VR C) power rails for Intel CFL/CNL CPUs. It executes SVID commands from the processor, regulates each rail with differential remote sensing and programmable load lines, and coordinates PS4 entry/exit-all within a single 40-pin QFN package. Its R3™ modulator ensures rapid transient response critical for modern CPU burst workloads.
Does the ISL95857CHRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95857CHRTZ-T supports two current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for thermal accuracy, and precision resistor-based sensing for higher absolute current measurement fidelity. The choice is configured at design time via external component selection on IMON pins, and both methods are fully supported across all three VR outputs (VR A, VR B, VR C) in the ISL95857CHRTZ-T.
How does the ISL95857CHRTZ-T implement PS4 power-state support?
The ISL95857CHRTZ-T fully complies with Intel IMVP8 PS4 requirements by entering ultra-low-quiescent-current mode (<150µA typical) upon receiving the PS4 command via SVID, disabling non-essential circuitry while maintaining VR_READY assertion readiness. It exits PS4 within 50µs when signaled by the CPU, restoring full regulation capability. This behavior is verified per FN8968 Rev.0.00 and is intrinsic to the ISL95857CHRTZ-T silicon design.
Can VR B on the ISL95857CHRTZ-T operate in 2-phase mode?
Yes, VR B on the ISL95857CHRTZ-T is hardware-configurable for either 1-phase or 2-phase operation using external resistors on the PHASE_SEL pins, as specified in the ISL95857C datasheet. This flexibility allows designers to optimize the VGT rail for higher current (2-phase) or smaller solution size (1-phase) without changing the ISL95857CHRTZ-T controller or firmware-making it adaptable across multiple Intel CPU SKUs and platform tiers.
What is the role of the PSYS pin on the ISL95857CHRTZ-T?
The PSYS pin on the ISL95857CHRTZ-T accepts an analog voltage representing total system input power, enabling platform-level power budgeting and thermal management. It interfaces with a dedicated power monitor IC (e.g., ISL68127 or compatible) to feed real-time input power data back to the CPU or EC. This feature is explicitly supported in the ISL95857CHRTZ-T and required for full IMVP8 PSYS compliance in high-end notebook and desktop platforms.
ISL95857CHRTZ-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:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857CHRTZ-T FAQ
1.How can I place an order for ISL95857CHRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857CHRTZ-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 ISL95857CHRTZ-T reliable?
The price and inventory of ISL95857CHRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857CHRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95857CHRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857CHRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857CHRTZ-T?
ISL95857CHRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857CHRTZ-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 ISL95857CHRTZ-T?
For technical support, including ISL95857CHRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857CHRTZ-T requirements.
6.How does Aetrix verify that ISL95857CHRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95857CHRTZ-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 ISL95857CHRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95857CHRTZ-T?
All ISL95857CHRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857CHRTZ-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 ISL95857CHRTZ-T part is unused and in its original packaging.
Return procedure for ISL95857CHRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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