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Renesas ISL95820IRTZ-T
- Part No.:
- ISL95820IRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95820IRTZ-T.pdf
- Description:
- IC REG CTRLR VR12.5 1OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,775
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Product details
Overview
ISL95820IRTZ-T 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-T datasheet, ISL95820IRTZ-T pinout, ISL95820IRTZ-T application, or ISL95820IRTZ-T equivalent, key selection considerations include VR12.5 serial bus compliance (SVID), DCR/resistor current sensing flexibility, programmable IMAX and slew rate, phase shedding capability, and R3™-based transient response performance.
Technical Context
The ISL95820IRTZ-T implements a hybrid digital architecture with analog R3™ modulator core, enabling variable-frequency operation during load transients and fixed-frequency PWM under steady state. It communicates with Intel CPUs via SVID-compliant SMBus/PMBus interface and supports dynamic phase shedding across 1–4 phases based on power-state commands.
It provides differential remote voltage sensing, adaptive body diode conduction time reduction, and configurable protection including adjustable overcurrent threshold and programmable VBOOT startup voltage. Current sensing is supported via lossless DCR (with single NTC thermistor compensation) or precision shunt resistor methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Architecture | Hybrid digital PWM with analog R3™ modulator core for fast transient response and variable switching frequency |
| Phase Support | Configurable 1-, 2-, 3-, or 4-phase operation using three integrated gate drivers |
| Voltage Accuracy | ±0.5% system accuracy over full temperature range - ensures VR12.5 compliance for CPU core regulation |
| Current Sensing | Supports both DCR-based (with NTC compensation) and precision resistor-based sensing - enables lossless or high-accuracy current monitoring |
| Interface Protocol | SVID-compliant SMBus/PMBus - enables direct communication with Intel VR12.5 CPUs without external protocol translation |
| Light-Load Efficiency | Diode emulation mode in single-phase - reduces switching losses at low loads to improve efficiency |
| Protection Features | Adjustable overcurrent protection, programmable VBOOT, and adaptive body diode conduction time reduction - enhances reliability under fault conditions |
Pinout & Package
ISL95820IRTZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined per Figure 1 of FN8318 Rev 1.00 and include VIN, VCORE, PHASE1–PHASE4, SDA/SCL, ALERT#, PG#, and multiple sense/compensation terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 5V or 12V input for controller bias and gate driver operation |
| VCORE | Output voltage feedback | Differential remote sense input for precise CPU core voltage regulation |
| PHASE1–PHASE4 | Gate drive outputs | Four dedicated high-side/low-side gate drive signals - supports up to 4-phase buck topology |
| SDA/SCL | Serial data interface | SVID-compliant SMBus/PMBus bidirectional communication with CPU |
| PG# | Power-Good indicator | Open-drain output signaling valid VCORE within ±0.5% tolerance |
| ALERT# | Fault reporting | Active-low signal indicating overcurrent, overvoltage, or thermal fault condition |
Key Features
| Feature | Design Value |
|---|---|
| R3™ modulator technology | Enables variable-frequency operation during load transients for <10 µs response time and improved light-load efficiency via diode emulation |
| Configurable multi-phase operation | Dynamic phase shedding between 1–4 phases based on CPU power-state commands - reduces idle power without changing PCB layout |
| Dual current sensing support | DCR sensing with single NTC compensation or precision resistor sensing - eliminates need for separate current-sense ICs |
| Programmable regulation parameters | Resistor-settable IMAX, load line slope, switching frequency, and VBOOT - allows tuning without firmware changes |
| SVID-compliant serial interface | Direct integration with Intel VR12.5 CPUs using standard SMBus/PMBus protocol - no protocol bridge required |
Applications
| Desktop CPU Voltage Regulator | VR12.5-Compliant Motherboard Power |
|---|---|
Use Scenario: Core voltage regulation for Intel 3rd–4th Gen Core i-series desktop processors requiring VR12.5 compliance. IC Role / Device Role / Timing Role: Primary PWM controller managing four-phase buck converter delivering VCORE with SVID-based dynamic VID updates. Use Value: Achieves ±0.5% voltage accuracy and sub-10 µs transient response - meets Intel VR12.5 specification for processor stability under rapid load steps. | Use Scenario: Mainboard VRM design targeting compact form factor and cost-sensitive OEM platforms. IC Role / Device Role / Timing Role: Integrated four-phase controller with three gate drivers and serial bus interface - reduces component count vs discrete controller + driver solutions. Use Value: Eliminates need for external protocol translator and enables smaller board area through integrated drivers and SVID-native communication. |
| High-Efficiency Light-Load Operation | Thermally Compensated DCR Sensing |
Use Scenario: Energy-efficient desktop systems operating extended periods at low CPU utilization (e.g., office PCs, HTPCs). IC Role / Device Role / Timing Role: Enables diode emulation mode in single-phase operation - dynamically disables unused phases and lowers switching frequency. Use Value: Improves light-load efficiency by >15% compared to fixed-frequency PWM - extends system energy certification eligibility. | Use Scenario: High-reliability VRMs where copper trace resistance drift must be compensated across temperature. IC Role / Device Role / Timing Role: Implements real-time DCR temperature compensation using single NTC thermistor connected to TS pin. Use Value: Maintains current-sense accuracy within ±3% over –40°C to +125°C - prevents false OCP triggering during thermal cycling. |
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 |
|---|---|---|---|
| IR3567BTRPBF | 6-phase capable, supports VR12/VR12.5/VR13, includes integrated MOSFET drivers with higher current rating | Targeted at higher-power server/workstation CPUs requiring >200A output | Choose IR3567BTRPBF when scaling beyond 4-phase or needing higher gate drive strength for discrete FETs |
| RT8803AZSP | 4-phase VR12.5 controller with integrated drivers, but uses proprietary serial interface instead of SVID | Requires custom firmware adaptation for CPU communication; not drop-in compatible with Intel reference designs | Choose RT8803AZSP only in closed-platform designs where SVID compliance is not required |
Compared with IR3567BTRPBF and RT8803AZSP, the ISL95820IRTZ-T offers native SVID compliance, optimized R3™ transient response for desktop VR12.5 use cases, and simpler thermal compensation implementation - making it ideal for cost-sensitive, standards-aligned motherboard designs.
Availability
ISL95820IRTZ-T is available at Aetrix Electronics and suitable for Intel VR12.5 desktop motherboards, high-efficiency CPU voltage regulators, and thermally compensated multi-phase VRM designs requiring stable component supply and long-term lifecycle support.
Supply support for ISL95820IRTZ-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 is a global semiconductor leader formed from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power management, and timing solutions.
The ISL95820IRTZ-T belongs to Renesas' high-performance digital power controller product line, engineered specifically for Intel VR12.5-compliant CPU core power delivery in desktop computing platforms.
FAQ
What is the primary function of the ISL95820IRTZ-T in a CPU power delivery system?
The ISL95820IRTZ-T serves as a four-phase PWM controller that regulates the core voltage (VCORE) for Intel VR12.5™ CPUs. It manages gate drive signals, implements R3™ modulation for fast transient response, communicates via SVID-compliant SMBus, and supports dynamic phase shedding. The ISL95820IRTZ-T ensures ±0.5% voltage accuracy while enabling high efficiency across load ranges - critical for stable CPU operation in desktop platforms.
Does the ISL95820IRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL95820IRTZ-T supports dual current sensing methods: lossless inductor DCR sensing with single NTC thermistor compensation for temperature drift correction, and precision shunt resistor sensing for higher accuracy where DCR variation is unacceptable. This flexibility allows designers to optimize for cost or performance without changing the ISL95820IRTZ-T controller IC or firmware.
What package type and pin count does the ISL95820IRTZ-T use?
The ISL95820IRTZ-T is packaged in a 48-pin QFN (7mm × 7mm, 0.5mm pitch) with an exposed thermal pad for enhanced heat dissipation. Its pinout includes dedicated PHASE1–PHASE4 outputs, VIN and VCORE rails, SDA/SCL for SVID communication, PG# and ALERT# status signals, and terminals for current sense, temperature compensation, and configuration resistors - all documented in FN8318 Rev 1.00.
How does the R3™ modulator in the ISL95820IRTZ-T improve transient response?
The R3™ modulator in the ISL95820IRTZ-T enables variable switching frequency during load transients, allowing immediate duty-cycle adjustment without waiting for next clock cycle. This results in sub-10 µs response time to step-load changes - significantly faster than traditional fixed-frequency PWM controllers. The ISL95820IRTZ-T maintains this advantage while retaining stable operation under steady-state conditions.
Is the ISL95820IRTZ-T compatible with Intel VR12.5 CPU serial VID (SVID) commands?
Yes, the ISL95820IRTZ-T features native SVID-compliant SMBus/PMBus interface with conflict-free operation, enabling direct communication with Intel VR12.5™ CPUs for dynamic VID updates, power-state reporting, and telemetry. No external protocol translator or firmware layer is required - the ISL95820IRTZ-T interprets SVID commands in hardware, ensuring full compliance with Intel's VR12.5 specification.
ISL95820IRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-T FAQ
1.How can I place an order for ISL95820IRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95820IRTZ-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 ISL95820IRTZ-T reliable?
The price and inventory of ISL95820IRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95820IRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95820IRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95820IRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95820IRTZ-T?
ISL95820IRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95820IRTZ-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 ISL95820IRTZ-T?
For technical support, including ISL95820IRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95820IRTZ-T requirements.
6.How does Aetrix verify that ISL95820IRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95820IRTZ-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 ISL95820IRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95820IRTZ-T?
All ISL95820IRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95820IRTZ-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 ISL95820IRTZ-T part is unused and in its original packaging.
Return procedure for ISL95820IRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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