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Renesas ISL95855BHRTZ
- Part No.:
- ISL95855BHRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
ISL95855BHRTZ.pdf
- Description:
- IC REG CTRLR IMVP8 3OUT 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,522
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Product details
Overview
ISL95855BHRTZ from Renesas (formerly Intersil) is a 3+2+1-phase IMVP8™ desktop CPU voltage regulator controller supporting core (VR A), graphics (VR B), and non-SVID system agent (VR C) rails. It delivers 0.5% system accuracy over temperature, supports DCR/resistor current sensing, and integrates R3™ modulator technology for fast transient response and diode emulation at light load.
For engineers reviewing the ISL95855BHRTZ datasheet, ISL95855BHRTZ pinout, ISL95855BHRTZ application, or ISL95855BHRTZ equivalent, key selection criteria include IMVP8 compliance, three independent VR outputs with phase configurability (3/2/1, 2/1, 1), PSYS input power monitoring, and VccSA fixed-rail support without SVID interface.
Technical Context
The ISL95855BHRTZ implements a Robust Ripple Regulator (R3™) modulator architecture enabling variable switching frequency during load transients and adaptive body diode conduction time reduction. It uses a shared serial control bus for all three VR outputs to reduce board area versus dual-chip solutions.
VR A supports 3-, 2-, or 1-phase operation with programmable IMAX, slew rate, and droop; VR B supports 2- or 1-phase; VR C is fixed 1-phase for non-SVID VccSA. All outputs feature differential remote sensing, OC protection, and a unified VR_READY signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IMVP8 Compliance | Fully compliant timing, protocol, and protection requirements for Intel 4th–6th Gen desktop CPUs. |
| Output Configuration | Three independent VR controllers: VR A (3/2/1-phase), VR B (2/1-phase), VR C (1-phase fixed VccSA). |
| System Accuracy | ±0.5% over full temperature range - enables tight VOUT tolerance for CPU core/GT rail stability. |
| Current Sensing | Supports lossless DCR sensing with single NTC thermistor compensation or precision resistor-based sensing. |
| R3™ Modulator | Enables faster transient settling, variable frequency under load step, and diode emulation mode for light-load efficiency. |
| PSYS Monitoring | Integrated system input power monitor input for real-time platform-level power budgeting and thermal management. |
| Voltage Sensing | Differential remote sense on all three outputs - rejects PCB IR drop for accurate load-point regulation. |
Pinout & Package
ISL95855BHRTZ 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), including dedicated SVID bus lines (SVID_CLK, SVID_DATA), VR-specific PWM outputs (PWM_Ax, PWM_Bx, PWM_C), current sense inputs (CSA+, CSA−, CSB+, CSB−, CSC+), remote sense pairs (VSNS_A, VSNS_B, VSNS_C), and PSYS input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVID_CLK / SVID_DATA | Shared serial bus interface | Single bidirectional bus for all three VRs - reduces routing complexity vs. discrete controllers. |
| PWM_A0–A2 / B0–B1 / C0 | Phase PWM outputs | Drives external DrMOS or discrete FETs; count matches configured phase count per VR. |
| CSA+/−, CSB+/−, CSC+ | Current sense inputs | Dedicated differential inputs per VR - supports DCR or resistor sensing with independent gain calibration. |
| VSNS_A/B/C, VFB_A/B/C | Remote voltage sense | Differential inputs referenced to local ground - compensates for PCB trace resistance to maintain ±0.5% accuracy. |
| PSYS | System input power monitor | Analog input accepting scaled voltage proportional to total platform input power - used for dynamic power capping. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable SVID addresses | Independent address assignment per VR output enables coexistence of multiple ISL95855BHRTZ devices or mixed VR configurations on one bus. |
| Non-SVID VR C for VccSA | Dedicated fixed 1-phase controller for Intel's system agent rail - eliminates need for separate SVID-capable IC or firmware overhead. |
| Adaptive body diode reduction | Minimizes reverse conduction losses in high-side FETs during light-load discontinuous conduction mode - improves efficiency by ~2–3% at <10% load. |
| Resistor-programmable parameters | IMAX, switching frequency, droop, and VBOOT startup voltage set via external resistors - no EEPROM or firmware required for configuration. |
| Unified VR_READY signal | Single open-drain power-good indicator confirms stable regulation across all three VR outputs - simplifies motherboard sequencing logic. |
Applications
| Desktop CPU Core Power Delivery | Desktop GPU Voltage Regulation |
|---|---|
Use Scenario: Primary voltage regulation for Intel 4th–6th Gen desktop CPU cores (IA rail) requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: 3-phase VR controller (VR A) delivering up to 60A with programmable IMAX and adaptive droop. Use Value: ±0.5% system accuracy and R3™ modulation ensure stable core voltage under rapid load steps (e.g., turbo boost transitions). | Use Scenario: Dedicated graphics rail (GT rail) for integrated GPU on LGA1150/LGA1151 platforms with dynamic power scaling. IC Role / Device Role / Timing Role: 2-phase VR controller (VR B) supporting scalable phase count and PSYS-monitored power budgeting. Use Value: Shared SVID bus and unified VR_READY reduce motherboard BOM count while maintaining independent GT rail control. |
| System Agent (VccSA) Supply | IMVP8 Platform Power Management |
Use Scenario: Fixed-voltage supply for Intel CPU system agent domain, which requires stable 1.05V–1.15V without SVID negotiation. IC Role / Device Role / Timing Role: Non-SVID 1-phase VR controller (VR C) with dedicated PWM and current sense path. Use Value: Eliminates need for external level-shifting or protocol translation - direct connection to VccSA power stage. | Use Scenario: Real-time platform-level power monitoring and thermal throttling coordination across CPU, GPU, and SA domains. IC Role / Device Role / Timing Role: PSYS analog input integration with synchronized VR control - enables closed-loop power capping. Use Value: Enables OEMs to enforce TDP limits without host CPU intervention - critical for small-form-factor desktops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail CPU voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95855HRTZ | Same pinout and function but lacks PSYS input and VR C non-SVID support; VR C is SVID-enabled. | Requires SVID-capable VccSA rail; not suitable for IMVP8 desktops needing fixed non-SVID VccSA. | Select ISL95855BHRTZ when VccSA must operate without SVID handshake or PSYS monitoring is required. |
| RT8803AZQW | 3+2+1-phase IMVP8 controller with integrated MOSFET drivers; no PSYS input; different pinout and register map. | Targets cost-sensitive designs where driver integration reduces external component count but sacrifices flexibility in power stage selection. | Choose ISL95855BHRTZ for designs using discrete DrMOS or ISL95808 drivers and requiring PSYS feedback. |
Compared with ISL95855HRTZ and RT8803AZQW, the ISL95855BHRTZ uniquely combines non-SVID VccSA support, PSYS monitoring, and R3™ modulation - making it the only option for IMVP8 desktop motherboards requiring all three features in a single controller.
Availability
ISL95855BHRTZ is available at Aetrix Electronics and suitable for desktop motherboard design, IMVP8-compliant CPU power delivery, and platform-level power management systems requiring stable component supply and long-term lifecycle support.
Supply support for ISL95855BHRTZ 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. Intersil was known for robust power ICs targeting computing, industrial, and communications infrastructure.
The ISL95855BHRTZ belongs to Intersil's IMVP8 VR controller product line, engineered specifically for Intel desktop CPU power architectures requiring multi-phase core, graphics, and system agent regulation with minimal footprint and high accuracy.
FAQ
What is the primary function of the ISL95855BHRTZ in an IMVP8 desktop platform?
The ISL95855BHRTZ serves as a 3+2+1-phase voltage regulator controller managing CPU core (VR A), integrated GPU (VR B), and system agent (VR C) rails. It implements IMVP8 protocol compliance, provides ±0.5% system accuracy, and integrates R3™ modulation for fast transient response. Its non-SVID VR C output directly supports fixed VccSA without SVID negotiation - a key requirement for LGA1150/LGA1151 desktop platforms.
Does the ISL95855BHRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95855BHRTZ supports both methods: lossless inductor DCR sensing with single NTC thermistor compensation for temperature drift correction, and precision resistor-based sensing for higher accuracy where board space allows. Each VR output (A, B, C) has dedicated differential current sense inputs (CSA±, CSB±, CSC+) configurable independently via external components and register settings.
How does the PSYS input on the ISL95855BHRTZ enhance platform power management?
The PSYS input on the ISL95855BHRTZ accepts an analog voltage proportional to total system input power, enabling real-time platform-level power budgeting. When combined with IMVP8's dynamic voltage/frequency scaling, this allows motherboard firmware to implement hardware-enforced TDP capping - critical for thermal management in compact desktop chassis. The ISL95855BHRTZ processes PSYS data internally to adjust VR behavior without CPU intervention.
Can the ISL95855BHRTZ be used in laptop or mobile IMVP8 designs?
No, the ISL95855BHRTZ is specified exclusively for IMVP8-compliant desktop CPUs. Its VR C output is configured for non-SVID VccSA - a desktop-specific requirement. Mobile IMVP8 implementations use different VccSA protocols and typically require SVID-enabled controllers like ISL95855HRTZ or ISL95857. The datasheet explicitly states "IMVP8 compliant desktops only" as the sole application.
What package type and thermal characteristics does the ISL95855BHRTZ use?
The ISL95855BHRTZ is packaged in a 48-pin QFN (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. This package supports high-power density layouts typical of desktop VRMs and enables efficient heat dissipation through the PCB thermal plane. The device operates from –40°C to +85°C ambient, with internal thermal shutdown protection triggered above 125°C junction temperature - consistent with IMVP8 thermal specification requirements.
ISL95855BHRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for ISL95855BHRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95855BHRTZ 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 reliable?
The price and inventory of ISL95855BHRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95855BHRTZ is usually 5 days.
3.What payment methods are accepted for ISL95855BHRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95855BHRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95855BHRTZ?
ISL95855BHRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95855BHRTZ 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?
For technical support, including ISL95855BHRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95855BHRTZ requirements.
6.How does Aetrix verify that ISL95855BHRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95855BHRTZ 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 meets industry standards.
7.What is the process for return or replacement of ISL95855BHRTZ?
All ISL95855BHRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95855BHRTZ, 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 part is unused and in its original packaging.
Return procedure for ISL95855BHRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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