My Inquiry
My Account
Renesas ISL95857AHRTZ
- Part No.:
- ISL95857AHRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95857AHRTZ.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL95857AHRTZ from Renesas (formerly Intersil) is a 1+2+1-phase IMVP8™ voltage regulator controller for Intel 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 compliance, and support for DCR/resistor current sensing.
For engineers reviewing the ISL95857AHRTZ datasheet, ISL95857AHRTZ pinout, ISL95857AHRTZ application, or ISL95857AHRTZ equivalent, key selection factors include IMVP8™ SVID interface compatibility, three-rail independent control with VR B phase configurability, R3™ modulator transient response, PSYS monitoring capability, and dual current-sensing method support.
Technical Context
The ISL95857AHRTZ implements Intel IMVP8™ serial voltage identification (SVID) protocol for dynamic CPU voltage scaling and PS4 entry/exit coordination. It integrates three independent VR controllers sharing one SVID bus, with VR A and VR C fixed at 1-phase operation and VR B configurable for either 1- or 2-phase output using external resistor programming.
R3™ modulator architecture enables variable switching frequency during load transients and diode-emulation mode at light loads to improve efficiency. Remote differential sensing, programmable IMAX, and selectable load-line coefficients (2.4mΩ/2mΩ/10.3mΩ per rail) are implemented per VR channel to meet IMVP8™ load-line regulation requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | 1+2+1-phase IMVP8™ VR controller for VCORE, VGT, VSA rails |
| System Accuracy | ±0.5% over temperature - ensures tight voltage tolerance for CPU stability |
| PS4 Support | Fully compliant - enables low-power idle state with controlled entry/exit timing |
| Current Sensing | DCR-based (with single NTC thermistor) or precision resistor - selectable per rail |
| Load Line Coefficients | VR A: 2.4mΩ, VR B: 2mΩ, VR C: 10.3mΩ - matches IMVP8™ rail-specific droop requirements |
| Switching Frequency | Resistor-programmable - allows optimization for EMI, efficiency, and component size |
| VR_READY Signal | Single power-good indicator for all three VRs - simplifies system power sequencing |
Pinout & Package
ISL95857AHRTZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95857A datasheet Rev 0.00 (May 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVID_DATA / SVID_CLK | IMVP8™ bidirectional serial interface | Carries SVID commands, telemetry, and PS4 state negotiation with CPU |
| VR_A_OUT / VR_B_OUT / VR_C_OUT | PWM outputs (3 channels) | Drive external DrMOS or discrete buck stages; phase count configured per rail |
| SENSE+ / SENSE− (per VR) | Differential remote sense inputs | Enable accurate load-point regulation by compensating for PCB IR drop |
| PSYS_IN | System input power monitor input | Supports real-time total platform power estimation via analog voltage summation |
| IMAX_A/B/C | Programmable current limit inputs | Resistor-set overcurrent thresholds per VR rail for fault protection |
Key Features
| Feature | Design Value |
|---|---|
| R3™ modulator architecture | Variable-frequency operation and diode-emulation mode deliver faster transient settling and improved light-load efficiency |
| Three-rail independent control | VR A and VR C fixed at 1-phase; VR B configurable for 1- or 2-phase - enables flexible power stage partitioning |
| IMVP8™ PS4 compliance | Full hardware support for PS4 entry/exit sequencing and telemetry - meets Intel platform power management requirements |
| Dual current-sensing options | DCR sensing with NTC compensation or precision resistor sensing - balances cost, accuracy, and board space |
| Programmable SVID address | Resistor-selectable device address - allows multiple ISL95857AHRTZ controllers on same SVID bus without conflict |
Applications
| Ultrabook Core Power Delivery | Gaming Laptop Graphics Rail |
|---|---|
Use Scenario: High-performance ultrabook with Intel Core i7 processor requiring strict VCORE regulation under dynamic workloads. IC Role / Device Role / Timing Role: ISL95857AHRTZ acts as the primary IMVP8™ VR controller for VR A (VCORE), managing PWM output, load-line droop, and PS4 transitions. Use Value: 0.5% system accuracy and R3™ fast transient response prevent CPU throttling during burst loads. | Use Scenario: Discrete GPU-enabled gaming laptop where VGT rail must scale independently with graphics workload intensity. IC Role / Device Role / Timing Role: ISL95857AHRTZ configures VR B as 2-phase output to deliver higher current to VGT while maintaining IMVP8™ compliance. Use Value: Configurable phase count and 2mΩ load line ensure stable GPU voltage under rapid current changes. |
| Desktop System Agent Supply | 2-in-1 Tablet Platform Power |
Use Scenario: Mini-ITX desktop motherboard needing reliable VSA rail for memory controller and PCIe root complex. IC Role / Device Role / Timing Role: ISL95857AHRTZ manages VR C (VSA) with 10.3mΩ load line and remote sensing to compensate for long trace drops. Use Value: Differential remote sensing and programmable IMAX prevent brownouts during multi-lane PCIe activity. | Use Scenario: Fanless 2-in-1 tablet requiring ultra-low quiescent current in PS4 state to extend battery life. IC Role / Device Role / Timing Role: ISL95857AHRTZ enters low-supply-current PS4 mode and coordinates with CPU for seamless suspend/resume. Use Value: PS4 compliance and low PS4 supply current directly increase standby time without compromising wake latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IMVP8™ voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95857HRTZ | Same die, non-A version - lacks PSYS monitoring and has reduced PS4 feature set | Not suitable for platforms requiring system-level power telemetry or full PS4 compliance | Select ISL95857AHRTZ when PSYS input and complete IMVP8™ PS4 support are mandatory |
| RT8803AGQW | Realtek IMVP8™ controller - supports 3-rail but uses different SVID implementation and lacks R3™ modulator | Requires validation of SVID command subset and transient response against platform timing specs | Choose RT8803AGQW only if cost sensitivity outweighs need for R3™-level transient performance |
Compared with ISL95857HRTZ and RT8803AGQW, the ISL95857AHRTZ uniquely combines full PSYS monitoring, complete PS4 compliance, and R3™ modulator advantages-making it the only option for high-fidelity IMVP8™ implementations demanding both precision regulation and advanced power-state coordination.
Availability
ISL95857AHRTZ is available at Aetrix Electronics and suitable for ultrabooks, gaming laptops, mini-ITX desktops, and 2-in-1 tablets requiring stable component supply and full IMVP8™ compliance.
Supply support for ISL95857AHRTZ 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 acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio for computing, industrial, and automotive markets.
The ISL95857AHRTZ belongs to Renesas' IMVP8™-compliant VR controller product line, engineered specifically for Intel CPU power delivery in thin-and-light and performance-oriented client platforms.
FAQ
What is the primary function of the ISL95857AHRTZ in an Intel platform?
The ISL95857AHRTZ serves as a 1+2+1-phase IMVP8™ voltage regulator controller, managing three independent power rails-VCORE (VR A), VGT (VR B), and VSA (VR C)-with precise load-line regulation, PS4 compliance, and SVID interface communication. Its role is central to CPU power delivery integrity across dynamic operating states.
Does the ISL95857AHRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95857AHRTZ supports two current-sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation, and precision resistor sensing. Each VR rail can be configured independently, allowing designers to optimize for cost, accuracy, or thermal performance based on platform requirements.
How does the R3™ modulator in the ISL95857AHRTZ improve transient response?
The R3™ modulator in the ISL95857AHRTZ enables variable switching frequency during load transients and diode-emulation mode at light loads. This architecture reduces output voltage deviation and shortens settling time compared to fixed-frequency modulators-critical for maintaining CPU stability during sudden workload shifts.
Can VR B on the ISL95857AHRTZ operate in 2-phase mode?
Yes, VR B on the ISL95857AHRTZ is configurable for either 1-phase or 2-phase operation using external resistor programming. This flexibility allows optimized power delivery to the graphics rail (VGT) in performance platforms, while VR A and VR C remain fixed at 1-phase for VCORE and VSA respectively.
What is the purpose of the PSYS input on the ISL95857AHRTZ?
The PSYS input on the ISL95857AHRTZ enables system input power monitoring by accepting an analog voltage proportional to total platform power draw. This signal supports real-time power budgeting and thermal management decisions in IMVP8™-compliant systems, and is a distinguishing feature of the "A" revision over earlier versions.
ISL95857AHRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Controller, Intel IMVP8
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 3
- Voltage - Output:
- 0.25V ~ 1.52V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95857AHRTZ FAQ
1.How can I place an order for ISL95857AHRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95857AHRTZ 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 ISL95857AHRTZ reliable?
The price and inventory of ISL95857AHRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95857AHRTZ is usually 5 days.
3.What payment methods are accepted for ISL95857AHRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95857AHRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95857AHRTZ?
ISL95857AHRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95857AHRTZ 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 ISL95857AHRTZ?
For technical support, including ISL95857AHRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95857AHRTZ requirements.
6.How does Aetrix verify that ISL95857AHRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95857AHRTZ 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 ISL95857AHRTZ meets industry standards.
7.What is the process for return or replacement of ISL95857AHRTZ?
All ISL95857AHRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95857AHRTZ, 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 ISL95857AHRTZ part is unused and in its original packaging.
Return procedure for ISL95857AHRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL95857AHRTZ Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
