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Renesas ISL95821CRTZ
- Part No.:
- ISL95821CRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95821CRTZ.pdf
- Description:
- IC REG CTRLR VR12.5 1OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,211
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Product details
Overview
ISL95821CRTZ from Renesas (formerly Intersil) is a three-phase PWM controller IC designed specifically for Intel VR12.5™ CPU core voltage regulation. It integrates gate drivers, supports 1-/2-/3-phase operation, delivers 0.5% system voltage accuracy over temperature, uses R3™ modulator technology for fast transient response, and enables diode emulation mode for high light-load efficiency in single-phase operation.
For engineers reviewing the ISL95821CRTZ datasheet, ISL95821CRTZ pinout, ISL95821CRTZ application, or ISL95821CRTZ equivalent, key selection considerations include VR12.5 serial bus compliance, DCR/resistor current sensing flexibility, programmable IMAX and loadline, remote differential voltage sensing, and phase-shedding capability across dynamic power states.
Technical Context
The ISL95821CRTZ implements Intersil's proprietary Robust Ripple Regulator (R3™) modulator architecture, enabling variable switching frequency during load transients and adaptive body diode conduction time reduction. It communicates with Intel CPUs via a dedicated serial control bus for VID code updates and power-state coordination.
It supports dual current-sensing methods-lossless DCR sensing with single NTC thermistor compensation or precision resistor-based sensing-and includes differential remote voltage sense inputs, programmable VBOOT, and adjustable slew rate for voltage transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Controller Type | Three-phase PWM controller for Intel VR12.5™ CPU core power supplies |
| Modulator Technology | R3™ modulator with variable-frequency operation and diode emulation mode |
| Voltage Accuracy | ±0.5% system accuracy over full operating temperature range |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and precision resistor sensing |
| Phase Configuration | Configurable 1-, 2-, or 3-phase output with integrated high- and low-side gate drivers |
| Interface | Serial control bus compliant with Intel VR12.5™ CPU communication protocol |
| Voltage Sensing | Differential remote sense inputs for accurate VCORE regulation |
Pinout & Package
ISL95821CRTZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95821 datasheet (FN8438), including dedicated VIN, PHASE1–PHASE3, VCORE sense, serial bus (SMBus-compatible), and protection signal pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Primary power input for controller and gate drivers (supports wide input range per VR12.5 spec) |
| PHASE1–PHASE3 | Gate driver outputs | High- and low-side drive signals for external MOSFETs in each phase |
| VCORE_SNSP/VCORE_SNSN | Differential voltage sense inputs | Enable precise remote sensing of CPU core voltage at point-of-load |
| SCL/SDA | Serial bus interface | SMBus-compatible bidirectional interface for VID code, status, and power-state commands from CPU |
| PGOOD | Power-good indicator | Open-drain output signaling valid VCORE within regulation window |
Key Features
| Feature | Design Value |
|---|---|
| Phase shedding with power state selection | Automatically reduces active phases (3→2→1) under light load to maintain high efficiency without manual reconfiguration |
| Programmable IMAX and loadline | Resistor-adjustable current limit and voltage droop slope to meet Intel VR12.5™ loadline specification |
| Adaptive body diode conduction time reduction | Minimizes reverse recovery losses in synchronous rectifiers during light-load diode emulation |
| Programmable VBOOT voltage | Adjustable bootstrap capacitor precharge voltage ensures reliable high-side FET turn-on at startup |
| Resistor-programmable switching frequency | Allows optimization of EMI, efficiency, and component size via external resistor selection |
Applications
| Desktop CPU Voltage Regulation | VR12.5-Compliant Motherboard Power |
|---|---|
Use Scenario: Core voltage regulation for Intel 3rd–4th Gen Core i-series desktop CPUs on ATX motherboards. IC Role / Device Role / Timing Role: Primary PWM controller managing multi-phase buck conversion, phase shedding, and serial VID updates. Use Value: Enables ±0.5% VCORE accuracy and fast transient response required by Intel VR12.5™ specification. | Use Scenario: Integrated VR solution on high-density consumer and workstation motherboards. IC Role / Device Role / Timing Role: Central controller coordinating gate drivers, current sensing, and SMBus communication with CPU. Use Value: Reduces board area and BOM count via integrated drivers and serial bus interface instead of discrete logic. |
| Multi-Phase Buck Converter Reference Design | Intel CPU Power Validation Platform |
Use Scenario: Reference design for 3-phase VR using discrete MOSFETs and DCR current sensing. IC Role / Device Role / Timing Role: R3™ modulator-based controller delivering variable-frequency operation and diode emulation. Use Value: Achieves >90% efficiency at 10% load via single-phase diode emulation mode. | Use Scenario: Power subsystem validation testbed for Intel VR12.5™ compliance testing. IC Role / Device Role / Timing Role: Serial bus–managed controller verifying VID step response, PGOOD timing, and phase-shedding latency. Use Value: Supports full Intel-defined power-state transitions (C0–C6) with synchronized phase activation/deactivation. |
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 |
|---|---|---|---|
| IR35201MTRPBF | Supports VR12/VR12.5/IMVP7; uses digital DCDA architecture; requires external EEPROM for configuration | Targeted at higher-end desktop and mobile platforms with tighter transient specs and telemetry reporting | Choose IR35201MTRPBF when digital configurability, telemetry, and IMVP7 support are required beyond VR12.5 baseline |
| RT8803AZSP | Single-chip 3-phase controller with integrated MOSFET drivers; supports VR12.5 but lacks serial bus interface and R3™ modulator | Used in cost-sensitive mainstream desktop boards where SMBus CPU handshake is not implemented | Choose RT8803AZSP only if serial bus communication with CPU is omitted and analog VID control suffices |
Compared with IR35201MTRPBF and RT8803AZSP, the ISL95821CRTZ provides native VR12.5 serial bus integration and R3™ modulator benefits-faster transient response and adaptive phase shedding-without requiring external memory or sacrificing analog design simplicity.
Availability
ISL95821CRTZ is available at Aetrix Electronics and suitable for Intel VR12.5™ desktop motherboard designs, multi-phase CPU power reference platforms, and VR compliance validation systems requiring stable component supply and long-lifecycle support.
Supply support for ISL95821CRTZ 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 ISL95821CRTZ belongs to Renesas' VR controller product line, engineered specifically to meet Intel's VR12.5™ specification for desktop CPU core power delivery with emphasis on accuracy, transient response, and serial bus interoperability.
FAQ
What is the primary function of the ISL95821CRTZ in a CPU power delivery system?
The ISL95821CRTZ serves as the central three-phase PWM controller for Intel VR12.5™-compliant CPU core voltage regulation. It manages gate drive signals, implements R3™ modulator-based voltage control, executes phase shedding, and communicates with the CPU via serial bus. The ISL95821CRTZ ensures ±0.5% VCORE accuracy and fast transient response while supporting both DCR and resistor current sensing methods.
Does the ISL95821CRTZ support Intel VR12.5™ serial bus communication?
Yes, the ISL95821CRTZ natively supports Intel VR12.5™ serial bus communication through dedicated SCL and SDA pins compatible with SMBus protocols. This allows real-time VID code updates, power-state coordination (C0–C6), and status reporting directly with the CPU-eliminating need for external logic or VID DACs. The ISL95821CRTZ relies on this interface for dynamic voltage scaling and phase-shedding commands.
What current sensing methods does the ISL95821CRTZ support?
The ISL95821CRTZ supports two validated current sensing methods: lossless inductor DCR sensing with single NTC thermistor for temperature compensation, and precision resistor-based sensing. Both are fully supported in the ISL95821CRTZ datasheet (FN8438) and configurable via external components. The choice affects layout complexity and accuracy trade-offs but does not require firmware changes in the ISL95821CRTZ.
How does the R3™ modulator in the ISL95821CRTZ improve transient response?
The R3™ modulator in the ISL95821CRTZ enables variable switching frequency that increases during load transients-reducing output voltage deviation-and decreases at light loads to improve efficiency. It also supports diode emulation mode in single-phase operation. These behaviors are inherent to the ISL95821CRTZ analog control architecture and require no digital programming or external components.
What package type and pin count does the ISL95821CRTZ use?
The ISL95821CRTZ uses a 48-pin QFN package measuring 7mm × 7mm with 0.5mm pitch and an exposed thermal pad. This package is specified in the official ISL95821CRTZ datasheet (FN8438 Rev 0.00) and is compatible with standard reflow profiles. The pinout includes dedicated PHASE1–PHASE3 driver outputs, differential VCORE sense inputs, and SMBus interface pins-all electrically and mechanically defined for the ISL95821CRTZ.
ISL95821CRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR12.5
- Voltage - Input:
- 4.5V ~ 28V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.5V ~ 2.3V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95821CRTZ FAQ
1.How can I place an order for ISL95821CRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95821CRTZ 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 ISL95821CRTZ reliable?
The price and inventory of ISL95821CRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95821CRTZ is usually 5 days.
3.What payment methods are accepted for ISL95821CRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95821CRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95821CRTZ?
ISL95821CRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95821CRTZ 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 ISL95821CRTZ?
For technical support, including ISL95821CRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95821CRTZ requirements.
6.How does Aetrix verify that ISL95821CRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95821CRTZ 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 ISL95821CRTZ meets industry standards.
7.What is the process for return or replacement of ISL95821CRTZ?
All ISL95821CRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95821CRTZ, 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 ISL95821CRTZ part is unused and in its original packaging.
Return procedure for ISL95821CRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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