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Renesas ISL95855BHRTZ-T
- Part No.:
- ISL95855BHRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95855BHRTZ-T.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,310
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Product details
Overview
ISL95855BHRTZ-T from Renesas (formerly Intersil) is a 3+2+1-phase IMVP8™ voltage regulator controller for Intel desktop CPUs, delivering precise core (VR A), graphics (VR B), and non-SVID system agent (VR C) rail regulation with 0.5% system accuracy over temperature, R3™ modulator technology, and support for DCR/resistor current sensing.
For engineers reviewing the ISL95855BHRTZ-T datasheet, ISL95855BHRTZ-T pinout, ISL95855BHRTZ-T application, or ISL95855BHRTZ-T equivalent, key selection criteria include IMVP8™ compliance, three independent VR outputs with phase configurability (3/2/1, 2/1, 1), PSYS input power monitoring, SVID address programmability, and VccSA fixed-rail support for desktop platforms.
Technical Context
The ISL95855BHRTZ-T implements a Robust Ripple Regulator (R3™) modulator architecture enabling variable switching frequency during load transients, diode emulation mode for light-load efficiency, and adaptive body diode conduction time reduction. It integrates PWM output drivers compatible with DrMOS and discrete power stages using ISL95808 drivers.
All three VR outputs share a common serial control bus for SVID communication with the CPU, while VR C operates as a fixed non-SVID rail for VccSA. Remote differential voltage sensing, programmable IMAX, slew rate, and droop are implemented per output with unified VR_READY signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Standard | IMVP8™ compliant - ensures interoperability with Intel 4th–6th Gen desktop CPUs and required SVID protocol timing. |
| Output Configuration | 3+2+1 VR architecture - VR A: 3/2/1-phase; VR B: 2/1-phase; VR C: fixed 1-phase non-SVID VccSA rail. |
| System Accuracy | ±0.5% over temperature - enables tight VOUT tolerance for CPU core, GT, and SA rails under thermal stress. |
| Current Sensing | DCR or resistor-based - supports lossless inductor sensing with single NTC thermistor compensation or higher-precision shunt sensing. |
| Modulator Type | R3™ (Robust Ripple Regulator) - delivers faster transient response, variable-frequency operation, and diode emulation at light loads. |
| Power Monitoring | PSYS input - provides system-level input power measurement capability for platform power management firmware. |
Pinout & Package
ISL95855BHRTZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95855B datasheet (FN8844 Rev 0.00).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 5V to 24V input for internal LDOs and gate drivers; powers controller core logic. |
| VCC | Internal LDO output | 3.3V regulated supply for digital circuitry; requires local 1µF ceramic decoupling. |
| SVID_DATA / SVID_CLK | SVID serial interface | Two-wire bus for bidirectional communication with CPU; supports programmable addresses per VR output. |
| VR_A_PWMx / VR_B_PWMx / VR_C_PWM | PWM output drivers | Three independent PWM outputs - VR A (up to 3 phases), VR B (up to 2), VR C (1) - drive external DrMOS or discrete FETs. |
| VSNSA+/VSNSA− / VSNSB+/VSNSB− / VSNSC+/VSNSC− | Differential remote sense | Per-rail Kelvin sensing inputs enabling accurate load-line regulation and IR drop compensation. |
| VR_READY | Power-good indicator | Open-drain output asserting when all three VRs meet regulation and sequencing requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable SVID addresses | Enables independent CPU communication with VR A, VR B, and VR C via shared serial bus - reduces PCB routing and component count vs. multi-controller solutions. |
| Non-SVID VR C for VccSA | Provides dedicated fixed-output regulation for Intel system agent rail without SVID handshake - simplifies design and eliminates need for separate controller. |
| Adaptive body diode conduction control | Reduces synchronous rectifier shoot-through and body diode conduction losses - improves efficiency across load range, especially at medium loads. |
| Resistor-programmable parameters | IMAX, slew rate, switching frequency, and droop set via external resistors - eliminates need for EEPROM or firmware configuration during board bring-up. |
| PSYS input support | Accepts analog voltage proportional to system input power - enables real-time platform-level power budgeting and thermal throttling by host firmware. |
Applications
| Desktop CPU Core Regulation | Desktop GPU Voltage Regulation |
|---|---|
Use Scenario: Power delivery to Intel CPU cores on high-performance desktop motherboards requiring dynamic voltage scaling and fast transient response. IC Role / Device Role / Timing Role: Primary VR controller for VR A output, managing up to 3-phase buck conversion with R3™ modulation and SVID-controlled VID updates. Use Value: Enables sub-10µs transient recovery and ±0.5% output accuracy - critical for maintaining stability during turbo boost and AVX workloads. | Use Scenario: Dedicated voltage regulation for integrated graphics (GT) rail on IMVP8™-compliant desktop platforms. IC Role / Device Role / Timing Role: VR B controller configured for 2-phase operation, providing independent SVID-controlled regulation synchronized with CPU core rail. Use Value: Supports dynamic graphics frequency scaling with matched load-line behavior and coordinated power-good signaling. |
| System Agent (VccSA) Supply | Platform Power Monitoring Integration |
Use Scenario: Fixed-voltage supply for Intel system agent domain in desktop CPUs where VccSA does not use SVID protocol. IC Role / Device Role / Timing Role: VR C controller operating as non-SVID 1-phase regulator - delivers stable 0.8–0.9V output with remote sensing and OC protection. Use Value: Eliminates need for separate VccSA controller, reducing BOM cost and layout area while maintaining IMVP8™ compliance. | Use Scenario: Real-time system input power tracking for thermal management and power capping in enthusiast and workstation desktop platforms. IC Role / Device Role / Timing Role: PSYS analog input interface enabling host firmware to monitor total platform DC input power using external sense resistor network. Use Value: Allows OS- or BIOS-level power budget enforcement without additional ADC or monitoring ICs - lowers system component count. |
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 |
|---|---|---|---|
| ISL95855HRTZ-T | Same die, different grade - commercial temperature range (0°C to +70°C) vs. ISL95855BHRTZ-T's extended range (−10°C to +85°C). | Targeted at standard ambient desktop environments; lacks extended low-temp startup capability. | Select ISL95855BHRTZ-T for systems requiring operation below 0°C or enhanced thermal margin. |
| RT8803AZQW | Single-chip 3+2+1 IMVP8™ controller with integrated gate drivers - no external MOSFET drivers needed; different pinout and register map. | Reduces external component count but requires full schematic and layout redesign; not pin-compatible. | Choose RT8803AZQW only for new designs prioritizing integration over reuse of ISL95855B reference layouts. |
Compared with ISL95855HRTZ-T, the ISL95855BHRTZ-T offers wider temperature operation essential for overclocked or compact chassis cooling; versus RT8803AZQW, it retains flexibility for discrete power stage optimization and legacy layout compatibility at the cost of higher external component count.
Availability
ISL95855BHRTZ-T is available at Aetrix Electronics and suitable for high-performance desktop motherboards, enthusiast gaming platforms, and workstation-class computing systems requiring stable component supply and long-term IMVP8™ compliance support.
Supply support for ISL95855BHRTZ-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 acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio for computing, industrial, and automotive markets.
The ISL95855BHRTZ-T belongs to Renesas' IMVP8™-certified voltage regulator controller product line, engineered specifically for Intel desktop CPU power delivery with emphasis on transient performance, multi-rail coordination, and platform-level power visibility.
FAQ
What is the operating temperature range of the ISL95855BHRTZ-T?
The ISL95855BHRTZ-T is rated for an extended industrial temperature range of −10°C to +85°C, supporting reliable operation in thermally demanding desktop platforms including compact ITX builds and overclocked systems. This range exceeds the commercial-grade ISL95855HRTZ-T and ensures stable VR_READY assertion and SVID communication across full ambient conditions. The ISL95855BHRTZ-T maintains 0.5% system accuracy throughout this range using integrated thermal compensation.
Does the ISL95855BHRTZ-T support both SVID and non-SVID outputs simultaneously?
Yes, the ISL95855BHRTZ-T supports simultaneous SVID and non-SVID operation: VR A and VR B are fully SVID-compliant with programmable addresses and dynamic VID updates, while VR C is a fixed non-SVID output for Intel VccSA. This hybrid architecture eliminates the need for a second controller and maintains IMVP8™ compliance without requiring SVID handshake on the system agent rail. The ISL95855BHRTZ-T manages all three outputs via a shared serial bus.
What current sensing methods does the ISL95855BHRTZ-T support?
The ISL95855BHRTZ-T supports two validated current sensing methods: lossless DCR sensing using inductor resistance with single NTC thermistor compensation, and precision resistor-based sensing using external shunts. Both methods are supported across all three VR outputs and enable accurate load-line regulation and overcurrent protection. The ISL95855BHRTZ-T includes dedicated amplifier inputs and calibration registers for either method - no hardware modification is required to switch between them.
Can the ISL95855BHRTZ-T be used in laptop or mobile platforms?
No, the ISL95855BHRTZ-T is explicitly designed and qualified only for IMVP8™-compliant desktop CPUs, as stated in its official documentation and application notes. It does not support mobile-specific features such as deep power-down modes, ULT voltage ranges, or mobile SVID extensions. Using the ISL95855BHRTZ-T in laptop designs would violate IMVP8™ specification alignment and risk improper CPU communication or rail sequencing. Desktop-only qualification is a hard constraint for the ISL95855BHRTZ-T.
How does the R3™ modulator in the ISL95855BHRTZ-T improve transient response?
The R3™ modulator in the ISL95855BHRTZ-T achieves faster transient settling by dynamically adjusting switching frequency in response to load steps - increasing frequency during transients to reduce output deviation, then lowering it at steady state for efficiency. Combined with diode emulation mode at light loads and adaptive body diode control, this architecture cuts typical core rail recovery time to under 10 µs. The ISL95855BHRTZ-T's R3™ implementation is optimized specifically for Intel desktop CPU load profiles.
ISL95855BHRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- IMVP8™ Compliant Desktops
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 3
- Voltage - Output:
- 0V ~ 1.52V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFN (6x6)
ISL95855BHRTZ-T FAQ
1.How can I place an order for ISL95855BHRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95855BHRTZ-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 ISL95855BHRTZ-T reliable?
The price and inventory of ISL95855BHRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95855BHRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95855BHRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95855BHRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95855BHRTZ-T?
ISL95855BHRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95855BHRTZ-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 ISL95855BHRTZ-T?
For technical support, including ISL95855BHRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95855BHRTZ-T requirements.
6.How does Aetrix verify that ISL95855BHRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95855BHRTZ-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 ISL95855BHRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95855BHRTZ-T?
All ISL95855BHRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95855BHRTZ-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 ISL95855BHRTZ-T part is unused and in its original packaging.
Return procedure for ISL95855BHRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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