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Renesas ISL95857HRTZ-T
- Part No.:
- ISL95857HRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857HRTZ-T.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,813
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Product details
Overview
ISL95857HRTZ-T from Renesas Electronics (formerly Intersil) is a 1+2+1-phase voltage regulator controller for Intel IMVP8™ CPUs, delivering precise core (VR A), graphics (VR B), and system agent (VR C) rail regulation with 0.5% system accuracy over temperature, PSYS input power monitoring, and R3™ modulator technology enabling fast transient response and diode emulation mode for light-load efficiency.
For engineers reviewing the ISL95857HRTZ-T datasheet, ISL95857HRTZ-T pinout, ISL95857HRTZ-T application, or ISL95857HRTZ-T equivalent, this controller supports SVID serial interface, resistor-programmable IMAX/switching frequency/address, DCR or resistor current sensing, and differential remote sensing across three independent VR outputs in a 40-pin QFN package.
Technical Context
The ISL95857HRTZ-T implements Intel IMVP8™ compliance via a shared SVID bus controlling three VR outputs: VR A (1-phase only), VR B (configurable 1- or 2-phase), and VR C (1-phase only), each with programmable load-line coefficients (2.4 mΩ, 2 mΩ, 10.3 mΩ respectively) and individual OC protection.
Its Robust Ripple Regulator (R3™) architecture enables variable switching frequency during load transients, diode emulation at light loads, and supports both lossless DCR sensing with single NTC thermistor compensation and high-precision resistor-based current sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Accuracy | 0.5% system accuracy over temperature ensures tight CPU rail tolerance under thermal stress. |
| VR Outputs | Three independent outputs: VR A (1-phase), VR B (1-/2-phase configurable), VR C (1-phase) for IMVP8™ core/graphics/SA rails. |
| Load-Line Coefficients | VR A = 2.4 mΩ, VR B = 2 mΩ, VR C = 10.3 mΩ - sets dynamic voltage droop per load current for Intel-compliant adaptive regulation. |
| Current Sensing | Supports either DCR sensing (with NTC compensation) or precision resistor sensing - enables flexible, accurate phase current measurement. |
| PSYS Monitoring | Integrated system input power monitor compliant with IMVP8™ PS4 requirements for platform-level power budgeting. |
| SVID Interface | Intel Serial Voltage Identification bus support enables direct CPU communication for dynamic VID updates and telemetry. |
| Switching Frequency | Resistor-programmable - allows optimization of efficiency vs. size trade-offs across operating conditions. |
Pinout & Package
Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 5 V to 24 V input for internal LDOs and gate drivers. |
| VDDA | Analog supply | Provides clean 5 V bias for analog circuitry including ADC and reference. |
| VR_A_PWM / VR_B_PWM / VR_C_PWM | PWM outputs | Three independent PWM signals driving external DrMOS or discrete buck stages for respective VR rails. |
| SVID_DATA / SVID_CLK | SVID interface | Two-wire serial bus connecting to CPU for VID commands, telemetry, and status reporting. |
| PSYS | System power monitor input | Analog input for measuring total platform input power per IMVP8™ PS4 specification. |
| IMON_A / IMON_B / IMON_C | Current sense inputs | Differential inputs accepting DCR or resistor-based current sense signals for each VR output. |
| VSENSE_A / VSENSE_B / VSENSE_C | Remote voltage sense | Differential inputs enabling Kelvin sensing at CPU pads to compensate for PCB IR drop. |
| VR_READY | Power-good indicator | Single open-drain signal asserting when all three VR outputs meet regulation and sequencing criteria. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Technology | Delivers faster transient settling and variable-frequency operation to maintain regulation during rapid CPU load changes. |
| Diode Emulation Mode | Reduces switching frequency at light loads to improve efficiency without requiring external control logic. |
| Programmable Load-Line Coefficients | Enables precise IMVP8™-compliant adaptive voltage positioning for VR A, VR B, and VR C independently. |
| Single VR_READY Signal | Combines power-good status of all three VRs into one pin, simplifying motherboard sequencing and fault detection. |
| Resistor-Programmable Settings | IMAX limit, switching frequency, and SVID address set via external resistors - eliminates need for EEPROM or firmware configuration. |
Applications
| Ultrabook Core Power Delivery | Desktop CPU VRM Design |
|---|---|
Use Scenario: High-efficiency, space-constrained core rail regulation in fanless ultrabooks with strict thermal and PS4 power-state requirements. IC Role / Device Role / Timing Role: Primary IMVP8™ controller managing VR A (core) with 2.4 mΩ load line, PSYS monitoring, and diode emulation for sub-1W idle power. Use Value: Enables 0.5% regulation accuracy and fast transient response while meeting Intel's low-quiescent-current PS4 spec. | Use Scenario: Multi-phase desktop CPU VRM supporting dynamic graphics and system agent loads with scalable phase count. IC Role / Device Role / Timing Role: Configurable 3-output controller where VR B (graphics) operates in 2-phase mode for higher current capability, VR A and VR C remain 1-phase. Use Value: Allows optimized phase allocation per rail-reducing component count versus discrete controllers while maintaining IMVP8™ compliance. |
| Tablet System Agent Regulation | Notebook Graphics Rail Control |
Use Scenario: Stable, low-noise system agent (VSA) rail in convertible tablets subject to mechanical flex and thermal cycling. IC Role / Device Role / Timing Role: VR C output with 10.3 mΩ load line and differential remote sensing compensates for PCB trace resistance and maintains voltage at SoC pins. Use Value: Ensures reliable SA rail operation across temperature and board stress, preventing system hang or PCIe link failures. | Use Scenario: Independent graphics rail control in dual-GPU notebooks where GPU load varies independently from CPU. IC Role / Device Role / Timing Role: VR B output configured as 1-phase for discrete GPU or 2-phase for integrated graphics, with dedicated IMON and VSENSE paths. Use Value: Delivers rail-specific current limiting and voltage positioning without cross-talk between core and graphics domains. |
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-T | 2+1-phase controller (no VR A); lacks PSYS monitoring and VR A output. | Targeted at platforms omitting dedicated core rail, e.g., some Atom-based designs. | Select when only graphics + system agent rails are required and PSYS is unused. |
| RT8803AGQW | 3-phase single-controller architecture; no separate VR A/B/C designation; fixed 1.5% accuracy. | Designed for cost-sensitive IMVP8™ implementations with simplified layout and fewer external components. | Choose for lower BOM count where 0.5% accuracy and independent load-line tuning are not mandatory. |
Compared with ISL95857HRTZ-T, the ISL95855HRTZ-T omits VR A and PSYS for reduced complexity, while the RT8803AGQW trades precision and configurability for integration and cost - making ISL95857HRTZ-T optimal for full-featured IMVP8™ CPU power delivery requiring independent rail control and highest accuracy.
Availability
ISL95857HRTZ-T is available at Aetrix Electronics and suitable for ultrabooks, desktop motherboards, high-end tablets, and Intel-based notebooks requiring stable component supply, long-term lifecycle support, and IMVP8™ compliance.
Supply support for ISL95857HRTZ-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 Corporation is a global semiconductor leader delivering trusted embedded solutions, with heritage from Intersil's analog and power management expertise and ISO 9001-certified manufacturing.
The ISL95857HRTZ-T belongs to Renesas' IMVP8™-compliant CPU voltage regulator controller product line, engineered specifically for high-accuracy, multi-rail power delivery in Intel client platforms with dynamic load demands.
FAQ
What is the primary function of the ISL95857HRTZ-T in an Intel platform?
The ISL95857HRTZ-T serves as a 1+2+1-phase voltage regulator controller for Intel IMVP8™ microprocessors, managing three independent power rails: VR A (core), VR B (graphics), and VR C (system agent). It delivers precise voltage regulation, load-line adaptation, and PSYS monitoring while interfacing directly with the CPU via SVID. The ISL95857HRTZ-T enables full compliance with IMVP8™ specifications including PS4 low-power state requirements.
Does the ISL95857HRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95857HRTZ-T supports two current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for temperature drift correction, and high-precision resistor-based sensing for applications demanding tighter current measurement accuracy. Each VR output (VR A, VR B, VR C) has dedicated IMON inputs, allowing independent selection per rail. This flexibility is documented in the ISL95857HRTZ-T datasheet sections on current sensing configuration.
How is the load-line coefficient configured for each VR output in the ISL95857HRTZ-T?
The ISL95857HRTZ-T uses fixed, factory-trimmed load-line coefficients: VR A = 2.4 mΩ, VR B = 2 mΩ, and VR C = 10.3 mΩ - matching Intel IMVP8™ requirements for core, graphics, and system agent rails respectively. These values are implemented internally and cannot be altered by external components. The ISL95857HRTZ-T applies them automatically during SVID communication and do not require resistor programming or register writes.
Can the ISL95857HRTZ-T operate in PS4 low-power state with minimal quiescent current?
Yes, the ISL95857HRTZ-T complies with Intel IMVP8™ PS4 power-state requirements, featuring ultra-low supply current during deep-sleep modes to minimize platform standby power. Its internal circuitry remains partially active to monitor SVID commands and maintain basic regulation readiness. This PS4 capability is validated in the ISL95857HRTZ-T datasheet's electrical characteristics table under "Supply Current - PS4 State".
What package type and pin count does the ISL95857HRTZ-T use?
The ISL95857HRTZ-T is housed in a 40-pin QFN package measuring 6 mm × 6 mm with 0.5 mm pitch and an exposed thermal pad for enhanced heat dissipation. This RoHS-compliant package supports reflow soldering and provides low-inductance connections for high-frequency PWM outputs and sensitive analog sensing paths. The full pinout, including VR_PWM signals, SVID interface, PSYS input, and remote sense terminals, is defined in the ISL95857HRTZ-T datasheet Figure 2.
ISL95857HRTZ-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)
ISL95857HRTZ-T FAQ
1.How can I place an order for ISL95857HRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857HRTZ-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 ISL95857HRTZ-T reliable?
The price and inventory of ISL95857HRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857HRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95857HRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857HRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857HRTZ-T?
ISL95857HRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857HRTZ-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 ISL95857HRTZ-T?
For technical support, including ISL95857HRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857HRTZ-T requirements.
6.How does Aetrix verify that ISL95857HRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95857HRTZ-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 ISL95857HRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95857HRTZ-T?
All ISL95857HRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857HRTZ-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 ISL95857HRTZ-T part is unused and in its original packaging.
Return procedure for ISL95857HRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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