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Renesas ISL95820IRTZ
- Part No.:
- ISL95820IRTZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95820IRTZ.pdf
- Description:
- IC REG CTRLR VR12.5 1OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:585
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Product details
Overview
ISL95820IRTZ from Renesas Electronics (formerly Intersil) is a green hybrid digital four-phase PWM controller IC designed for Intel VR12.5™ CPU core voltage regulation. It integrates three gate drivers, supports 1–4 phase operation, implements R3™ modulator technology, delivers 0.5% system voltage accuracy over temperature, and enables diode emulation mode for high light-load efficiency in single-phase operation.
For engineers reviewing the ISL95820IRTZ datasheet, ISL95820IRTZ pinout, ISL95820IRTZ application, or ISL95820IRTZ equivalent, key selection considerations include VR12.5 compliance, serial SVID interface compatibility, DCR/resistor current sensing flexibility, programmable slew rate and IMAX, and phase-shedding behavior across P-states.
Technical Context
The ISL95820IRTZ implements a digitally enhanced analog R3™ modulator architecture that dynamically adjusts switching frequency during load transients and enables phase shedding based on CPU power state requests via SVID. It uses a dedicated serial bus (SMBus/PMBus/I²C-compatible, conflict-free with SVID) for real-time communication with Intel CPUs.
It supports dual current-sensing methods: lossless DCR sensing with single NTC thermistor compensation, or precision resistor-based sensing. Remote differential voltage sensing, programmable VBOOT, and adaptive body diode conduction time reduction are implemented to maintain tight regulation under dynamic load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Architecture | R3™ hybrid digital modulator with variable-frequency transient response and diode emulation mode |
| Phase Support | Configurable 1-, 2-, 3-, or 4-phase output using three integrated gate drivers |
| Voltage Accuracy | ±0.5% system accuracy over full operating temperature range |
| Interface Protocol | SMBus/PMBus/I²C-compatible serial bus with SVID conflict-free operation |
| Current Sensing | Supports both DCR sensing (with NTC compensation) and precision resistor sensing |
| Protection Features | Programmable overcurrent protection, remote differential voltage sense, Power-Good signal |
| Startup Control | Resistor-programmable VBOOT voltage, IMAX, load line, slope compensation, and switching frequency |
Pinout & Package
ISL95820IRTZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per the official ISL95820 datasheet Rev 1.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 5V or 12V input; powers internal circuitry and gate drivers |
| VCORE | Core voltage feedback | Differential remote sense input for CPU core voltage regulation |
| PHASE1–PHASE4 | Gate drive outputs | Four-phase PWM outputs; PHASE1–PHASE3 are driven internally, PHASE4 requires external driver |
| SCL/SDA | Serial interface lines | SMBus/PMBus/I²C-compatible bidirectional control and telemetry interface |
| PGOOD | Status signal | Open-drain Power-Good indicator asserting when VCORE is within regulation tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Green Hybrid Digital R3™ Modulator | Enables faster transient response and variable-frequency operation without external compensation components |
| Configurable Multi-Phase Operation | Dynamic phase shedding across P-states reduces power loss while maintaining regulation stability |
| DCR + NTC Current Sensing | Eliminates current-sense resistors and associated power loss; NTC compensates for inductor DCR drift over temperature |
| Programmable Voltage Transition Slew Rate | Prevents overshoot/undershoot during VID transitions by controlling dV/dt of VCORE ramp |
| Adaptive Body Diode Conduction Time Reduction | Minimizes shoot-through and conduction losses in high-side MOSFETs during dead-time intervals |
Applications
| Desktop CPU Core VR | VR12.5-Compliant Motherboard |
|---|---|
Use Scenario: Regulating core voltage for Intel 3rd/4th Gen Core i-series desktop processors requiring VR12.5 compliance. IC Role / Device Role / Timing Role: Primary PWM controller managing multi-phase buck conversion, SVID communication, and dynamic phase shedding. Use Value: Achieves ±0.5% voltage accuracy and fast transient response essential for CPU performance scaling and thermal management. | Use Scenario: Integrated into ATX motherboard power delivery subsystem with discrete MOSFETs and chokes. IC Role / Device Role / Timing Role: Central VR controller coordinating gate drive timing, current sensing, and telemetry reporting via SMBus. Use Value: Reduces BOM count via integrated drivers and eliminates need for external DAC or VID decoder logic. |
| High-Efficiency Light-Load VR | Thermally Constrained VR Design |
Use Scenario: Powering idle or low-utilization CPU states where efficiency dominates thermal budget. IC Role / Device Role / Timing Role: Enables diode emulation mode in single-phase operation with load-dependent low-frequency switching. Use Value: Maintains >90% efficiency at 1A load by minimizing switching and conduction losses simultaneously. | Use Scenario: VR design in compact form factor with limited airflow and strict junction temperature limits. IC Role / Device Role / Timing Role: Provides differential remote sensing and adaptive body diode timing to suppress hot spots near CPU socket. Use Value: Ensures stable regulation despite PCB trace IR drop and thermal-induced DCR variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase CPU VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35201MTRPBF | Supports VR12/VR12.5; uses analog-based DCAP™ modulator instead of R3™; no diode emulation mode | Lacks light-load efficiency optimization for deep C-states; requires external current-sense resistors by default | Preferred where analog modulator familiarity and legacy board reuse outweigh efficiency gains |
| TPS53679RSAT | TI's dual-loop D-CAP3™ controller; supports up to 6 phases; includes integrated MOSFET drivers for all phases | Requires different layout due to higher pin count and dual-loop compensation; not SVID-conflict-free | Selected when scaling beyond 4 phases or requiring TI's Fusion Digital Power GUI support |
Compared with IR35201MTRPBF and TPS53679RSAT, the ISL95820IRTZ uniquely combines SVID conflict-free serial control, R3™ modulator-based transient agility, and built-in diode emulation-making it optimal for space-constrained VR12.5 designs prioritizing light-load efficiency and minimal external component count.
Availability
ISL95820IRTZ is available at Aetrix Electronics and suitable for Intel VR12.5 desktop motherboards, high-density server VRMs, and thermally constrained embedded computing platforms requiring stable component supply and long-term lifecycle support.
Supply support for ISL95820IRTZ 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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions with ISO 9001-certified manufacturing and reliability validation.
The ISL95820IRTZ belongs to Renesas' high-performance digital power controller product line, engineered specifically for Intel VR12.5-compliant CPU voltage regulation in desktop and entry-server platforms.
FAQ
What is the primary function of the ISL95820IRTZ in a CPU power delivery system?
The ISL95820IRTZ serves as the core PWM controller for Intel VR12.5™ CPU voltage regulation, managing multi-phase buck conversion, interpreting SVID commands from the processor, executing phase shedding, and maintaining ±0.5% VCORE accuracy. Its R3™ modulator enables rapid transient response critical for modern CPU burst workloads, and the ISL95820IRTZ integrates three gate drivers to reduce external component count in compact VR designs.
Does the ISL95820IRTZ support both DCR and resistor-based current sensing?
Yes, the ISL95820IRTZ supports dual current-sensing methods: lossless DCR sensing with automatic NTC thermistor compensation for inductor temperature drift, and precision resistor-based sensing for higher accuracy where DCR variation is unacceptable. Configuration is selected at startup via pin strapping or register setting, and the ISL95820IRTZ automatically adapts its gain and offset calibration accordingly without firmware intervention.
How does the ISL95820IRTZ achieve high light-load efficiency?
The ISL95820IRTZ achieves high light-load efficiency through diode emulation mode in single-phase operation, which disables synchronous rectification and allows body-diode conduction-reducing switching losses at low currents. Combined with load-dependent variable switching frequency and adaptive body diode conduction time reduction, the ISL95820IRTZ maintains >90% efficiency at 1A output while eliminating external diode components.
Is the ISL95820IRTZ compatible with Intel's SVID protocol without conflicts?
Yes, the ISL95820IRTZ implements an SVID-conflict-free SMBus/PMBus/I²C interface, meaning it coexists with the CPU's native SVID bus without address or timing collisions. This allows direct connection to the same serial bus used by the processor for VID updates and telemetry, simplifying motherboard routing and reducing isolation components-confirmed in the ISL95820IRTZ datasheet Rev 1.00 section "Serial Interface Description".
What package type and thermal characteristics does the ISL95820IRTZ use?
The ISL95820IRTZ is packaged in a 48-pin QFN (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad for enhanced heat dissipation. Its θJA is 30°C/W typical on a 4-layer JEDEC board, and the device includes thermal shutdown protection triggered at 150°C junction temperature. The ISL95820IRTZ's package supports reflow soldering per J-STD-020 and is RoHS-compliant.
ISL95820IRTZ 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 ~ 20V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.5V ~ 2.3V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL95820IRTZ FAQ
1.How can I place an order for ISL95820IRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95820IRTZ 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 ISL95820IRTZ reliable?
The price and inventory of ISL95820IRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95820IRTZ is usually 5 days.
3.What payment methods are accepted for ISL95820IRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95820IRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95820IRTZ?
ISL95820IRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95820IRTZ 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 ISL95820IRTZ?
For technical support, including ISL95820IRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95820IRTZ requirements.
6.How does Aetrix verify that ISL95820IRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95820IRTZ 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 ISL95820IRTZ meets industry standards.
7.What is the process for return or replacement of ISL95820IRTZ?
All ISL95820IRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95820IRTZ, 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 ISL95820IRTZ part is unused and in its original packaging.
Return procedure for ISL95820IRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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