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Renesas ISL95857HRTZ
- Part No.:
- ISL95857HRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857HRTZ.pdf
- Description:
- IC REG IMVP8 NOTEBK 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,336
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Product details
Overview
ISL95857HRTZ from Renesas Electronics (formerly Intersil) is a 1+2+1-phase voltage regulator controller for Intel IMVP8™ CPUs, delivering precise regulation for core (VR A), graphics (VR B), and system agent (VR C) rails. It supports DCR/resistor current sensing, differential remote sensing, 0.5% system accuracy over temperature, and PSYS input power monitoring.
For engineers reviewing the ISL95857HRTZ datasheet, ISL95857HRTZ pinout, ISL95857HRTZ application, or ISL95857HRTZ equivalent, this controller enables compliant, space-efficient CPU power delivery in ultrabooks, notebooks, and desktops with configurable phase assignment, R3™ modulator transient response, and SVID serial interface integration.
Technical Context
The ISL95857HRTZ implements Intel IMVP8™ SVID protocol via a shared serial bus across all three VR outputs, enabling coordinated communication with the CPU while reducing component count. It integrates Robust Ripple Regulator (R3™) technology to deliver variable switching frequency, diode emulation mode at light load, and fast transient settling without external compensation.
VR A and VR C are fixed 1-phase controllers; VR B is software- or resistor-configurable for either 1- or 2-phase operation. All outputs support programmable IMAX, adjustable switching frequency, OC protection, and a unified VR_READY signal, with load-line coefficients of 2.4 mΩ (VR A), 2.0 mΩ (VR B), and 10.3 mΩ (VR C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Standard | Compliant with Intel IMVP8™ specification for CPU core, graphics, and system agent rails |
| Output Configuration | Three independent VR outputs: VR A (1-phase), VR B (1-/2-phase configurable), VR C (1-phase) |
| System Accuracy | ±0.5% over temperature - ensures stable VDD rail tolerance under thermal stress |
| Current Sensing | Supports lossless DCR sensing with single NTC thermistor or precision resistor-based sensing |
| Load-Line Coefficients | VR A: 2.4 mΩ, VR B: 2.0 mΩ, VR C: 10.3 mΩ - defines dynamic voltage droop vs. load current |
| PS4 Power State | Low supply current in PS4 state - meets IMVP8™ deep-sleep power requirements |
| Interface Protocol | SVID-compliant serial bus - enables CPU-controlled VID updates, telemetry, and fault reporting |
Pinout & Package
ISL95857HRTZ is housed in a 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Renesas FN8750 Rev 2.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 5 V to 24 V input for internal LDOs and bias circuitry |
| VDDIO | Digital I/O supply | Provides 3.3 V power for SVID interface and logic circuits |
| SVID_CLK / SVID_DATA | SVID serial interface | Two-wire bus for bidirectional CPU communication and telemetry exchange |
| VR_A_OUT / VR_B_OUT / VR_C_OUT | PWM output drivers | Three independent PWM outputs driving external DrMOS or discrete buck stages |
| SENSE+ / SENSE− (per VR) | Differential remote sense inputs | Enables accurate load-point voltage regulation by rejecting PCB IR drop |
| PSYS | System input power monitor | Analog output proportional to total input power - used for thermal/power budgeting |
| VR_READY | Power-good indicator | Single open-drain signal asserting when all three VRs meet regulation and sequencing criteria |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Modulator Architecture | Delivers faster transient response and variable-frequency operation without external compensation components |
| Configurable VR B Phase Count | Resistor-selectable 1- or 2-phase mode - adapts to GPU power demand without firmware change |
| Dual Current Sensing Options | DCR sensing with integrated NTC compensation or high-precision resistor sensing - balances cost and accuracy |
| Unified VR_READY Signal | Single power-good output simplifies sequencing and reduces board routing complexity |
| Programmable Load-Line Coefficients | Per-rail mΩ coefficients (2.4/2.0/10.3) enable precise IMVP8™-compliant droop control |
Applications
| Ultrabook Core Power Delivery | Notebook Graphics Rail Control |
|---|---|
Use Scenario: High-efficiency, low-profile CPU core voltage regulation in fanless ultrabooks with strict thermal envelope. IC Role / Device Role / Timing Role: Primary IMVP8™ VR controller for VR A (core rail), managing PWM, current sensing, and SVID telemetry. Use Value: 0.5% system accuracy and R3™ transient response maintain stable VDD under burst workloads without derating. | Use Scenario: Adaptive GPU voltage scaling in dual-mode notebooks supporting discrete and integrated graphics. IC Role / Device Role / Timing Role: Configurable VR B controller enabling 1-phase (integrated GPU) or 2-phase (discrete GPU) operation via resistor selection. Use Value: Eliminates need for separate controllers - same ISL95857HRTZ layout supports both GPU configurations. |
| Desktop System Agent Regulation | IMVP8™ PSYS Power Monitoring |
Use Scenario: Stable system agent (VSA) rail regulation in compact mini-ITX desktops with high memory bandwidth demands. IC Role / Device Role / Timing Role: VR C controller delivering 1-phase regulation with 10.3 mΩ load line and remote sensing. Use Value: Differential remote sensing compensates for PCB voltage drop, ensuring ±0.5% accuracy at CPU socket. | Use Scenario: Real-time platform-level power budgeting in enterprise notebooks with thermal throttling policies. IC Role / Device Role / Timing Role: PSYS analog output provides continuous input power measurement for OS/firmware power management. Use Value: Enables dynamic CPU/GPU power capping based on total system input power, not just rail currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase CPU voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855HRTZ | 1+1+1 configuration (all outputs fixed 1-phase); no VR B phase configurability | Lacks adaptive graphics rail support - suitable only for fixed-core + fixed-GPU + fixed-SA designs | Select when VR B phase flexibility is unnecessary and BOM cost reduction is prioritized |
| RT8803AGQW | Supports IMVP9, not IMVP8™; different SVID command set and PSYS implementation | Requires updated CPU firmware and BIOS support; incompatible with IMVP8™ platforms | Choose only for new IMVP9™ designs - not a drop-in replacement for ISL95857HRTZ |
Compared with ISL95857HRTZ, ISL95855HRTZ offers lower cost but sacrifices VR B configurability, while RT8803AGQW targets next-gen IMVP9™ systems and cannot operate on IMVP8™ hardware without firmware redesign.
Availability
ISL95857HRTZ is available at Aetrix Electronics and suitable for ultrabooks, notebooks, and desktop motherboards requiring stable component supply, IMVP8™ compliance, and multi-rail CPU power management.
Supply support for ISL95857HRTZ 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 and industrial applications.
The ISL95857HRTZ belongs to Renesas' IMVP8™-compliant CPU voltage regulator controller product line, engineered specifically for space-constrained, thermally sensitive client platforms requiring precise multi-rail power delivery.
FAQ
What is the primary function of the ISL95857HRTZ in an Intel CPU power system?
The ISL95857HRTZ serves as a 1+2+1-phase voltage regulator controller that manages three independent power rails-core (VR A), graphics (VR B), and system agent (VR C)-for Intel IMVP8™ microprocessors. It delivers precise, coordinated regulation using SVID communication, R3™ modulation, and configurable phase assignment. The ISL95857HRTZ ensures compliance with IMVP8™ specifications including load-line droop, PS4 low-power state, and system accuracy.
Does the ISL95857HRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95857HRTZ supports two current sensing methods: lossless inductor DCR sensing with integrated NTC thermistor compensation for temperature drift, and high-precision resistor-based sensing for applications demanding tighter current measurement accuracy. Both methods are selectable at design time and supported simultaneously in the same IC, with dedicated pins and internal calibration paths for each. This flexibility allows designers to optimize cost versus accuracy for the ISL95857HRTZ implementation.
How is VR B phase configuration implemented on the ISL95857HRTZ?
VR B phase configuration on the ISL95857HRTZ is resistor-programmable: a pull-up or pull-down resistor on the PHASE_SEL pin selects between 1-phase or 2-phase operation. No firmware or SVID command is required-the setting is latched at power-on reset. This hardware-based selection ensures deterministic behavior during boot and eliminates dependency on CPU initialization sequence. The ISL95857HRTZ maintains full IMVP8™ compliance in both modes, with appropriate load-line and current reporting scaling.
What role does the PSYS pin play in the ISL95857HRTZ design?
The PSYS pin on the ISL95857HRTZ provides an analog voltage output proportional to total system input power, enabling real-time platform-level power monitoring. It integrates measurements from all three VRs and accounts for driver losses and input rail inefficiencies. This signal feeds into the platform controller hub or EC for thermal throttling, battery life optimization, and dynamic power capping-functions critical in ultrabooks and thin-and-light notebooks where the ISL95857HRTZ is commonly deployed.
Is the ISL95857HRTZ pin-compatible with other ISL958xx controllers like the ISL95855HRTZ?
No, the ISL95857HRTZ is not pin-compatible with the ISL95855HRTZ. Although both are 48-pin QFN devices, their pin assignments differ significantly-particularly for VR-specific signals (e.g., VR_B_PHASE_SEL, PSYS, and certain SVID auxiliary lines). Layout reuse is not possible without redesign. The ISL95857HRTZ includes dedicated pins for VR B phase selection and PSYS monitoring absent in the ISL95855HRTZ, confirming distinct footprint requirements for each part.
ISL95857HRTZ 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)
ISL95857HRTZ FAQ
1.How can I place an order for ISL95857HRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857HRTZ 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 reliable?
The price and inventory of ISL95857HRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857HRTZ is usually 5 days.
3.What payment methods are accepted for ISL95857HRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857HRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857HRTZ?
ISL95857HRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857HRTZ 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?
For technical support, including ISL95857HRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857HRTZ requirements.
6.How does Aetrix verify that ISL95857HRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95857HRTZ 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 meets industry standards.
7.What is the process for return or replacement of ISL95857HRTZ?
All ISL95857HRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857HRTZ, 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 part is unused and in its original packaging.
Return procedure for ISL95857HRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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