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Renesas ISL95818IRTZ-T
- Part No.:
- ISL95818IRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95818IRTZ-T.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,524
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Product details
Overview
ISL95818IRTZ-T from Renesas (formerly Intersil) is a 3-phase PWM controller for Intel VR12.5 and VR12.6+ CPU core power delivery, featuring R3™ modulation, 0.5% system voltage accuracy over temperature, integrated dual gate drivers, and support for DCR/resistor current sensing. It enables compact, high-efficiency multiphase VRMs in space-constrained notebook and desktop platforms.
For engineers reviewing the ISL95818IRTZ-T datasheet, ISL95818IRTZ-T pinout, ISL95818IRTZ-T application, or ISL95818IRTZ-T equivalent, key selection criteria include VR12.5/VR12.6+ compliance, R3™ transient response, programmable ICCMAX and slew rate, remote differential voltage sensing, and flexible phase configuration (1-/2-/3-phase).
Technical Context
The ISL95818IRTZ-T implements Intersil's Robust Ripple Regulator (R3™) technology, delivering variable-frequency PWM with faster transient settling and improved light-load efficiency. It supports serial bus communication with Intel CPUs for VID updates and telemetry, and integrates two gate drivers while requiring one external driver for full 3-phase operation.
It provides precision regulation via differential remote sensing, adaptive body diode conduction reduction, and configurable current sensing-using either lossless inductor DCR with NTC compensation or high-accuracy shunt resistors. The device also features programmable VBOOT, ICCMAX limit, and voltage transition slew rate to meet dynamic CPU load requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Compliance | Fully compliant with Intel VR12.5 and VR12.6+ specifications for CPU core VRM control. |
| Phase Config | Configurable as 1-, 2-, or 3-phase VR using two integrated + one external gate drivers. |
| Voltage Accuracy | 0.5% system accuracy over full operating temperature range - critical for CPU core voltage stability. |
| Current Sensing | Supports both lossless DCR sensing (with NTC compensation) and precision resistor-based sensing. |
| R3™ Modulation | Variable switching frequency during transients improves response time and light-load efficiency vs fixed-frequency PWM. |
| Serial Interface | Uses SMBus-compatible serial data bus for VID updates, telemetry, and CPU coordination. |
| Voltage Slew Rate | Resistor-programmable to control dV/dt during VID transitions and prevent overshoot/undershoot. |
Pinout & Package
ISL95818IRTZ-T is housed in a 40-pin QFN package (6mm × 6mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per Renesas ISL95818 datasheet Rev. 3.00 (2013).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side supply input | Provides bias for internal regulators and gate drivers; connects to 5V or 12V rail. |
| VDD | Core logic supply | Powers internal digital circuitry; requires local 3.3V decoupling. |
| PHASE1–PHASE3 | Gate drive outputs | PHASE1/PHASE2 are integrated drivers; PHASE3 requires external driver connection. |
| FB | Inverting feedback input | Differential remote sense input (paired with VSENSE) for precision core voltage regulation. |
| VSENSE | Non-inverting remote sense | Completes differential sensing loop; rejects PCB trace IR drop for accurate CPU die voltage. |
| SMBCLK/SMBDAT | Serial bus interface | SMBus-compatible bidirectional interface for VID updates and status reporting to CPU. |
| PGOOD | Power-good indicator | Open-drain output signals valid output voltage; used for CPU reset sequencing and system enable. |
| ICCMAX | Overcurrent threshold set | Resistor-programmable pin sets peak current limit per phase to prevent MOSFET overstress. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Technology | Enables variable-frequency PWM for faster transient response and higher efficiency at light loads without mode switching. |
| Dual Integrated Gate Drivers | Reduces external component count and board area; supports 2-phase operation natively, 3-phase with one external driver. |
| Differential Remote Sensing | Compensates for PCB voltage drop between VRM and CPU socket, ensuring ±0.5% regulation at the die. |
| Programmable VBOOT | Allows controlled bootstrap voltage ramp at startup to prevent inrush and ensure reliable high-side FET turn-on. |
| Adaptive Body Diode Conduction Reduction | Minimizes shoot-through and conduction losses by dynamically shortening low-side FET on-time during dead-time. |
Applications
| Gaming Laptop VRM | Workstation Desktop VRM |
|---|---|
Use Scenario: High-performance mobile platform with Intel Core i7/i9 CPU demanding rapid load-step response and tight voltage tolerance. IC Role / Device Role / Timing Role: Primary 3-phase VR controller managing core voltage under dynamic DVFS and Turbo Boost conditions. Use Value: R3™ modulation delivers sub-10µs transient recovery and 0.5% voltage accuracy, preventing CPU throttling or instability during burst workloads. | Use Scenario: Multi-core Xeon or Core i9 desktop system requiring stable core power across extended thermal envelopes. IC Role / Device Role / Timing Role: Multiphase VR controller with remote sensing and programmable slew rate for precise VID tracking during P-state transitions. Use Value: Differential sensing and DCR current monitoring maintain regulation accuracy despite PCB trace resistance and temperature drift. |
| Thin-and-Light Notebook VRM | Embedded Computing Module |
Use Scenario: Ultrabook design constrained by board area and thermal budget, needing minimal external components. IC Role / Device Role / Timing Role: Configurable 2-phase VR controller leveraging integrated gate drivers to eliminate two external drivers and associated passives. Use Value: Reduced BOM count and 6mm × 6mm QFN footprint enable compact VRM layout without sacrificing VR12.6+ compliance. | Use Scenario: Industrial-grade COM Express or SMARC module requiring long-lifecycle, Intel-spec-compliant CPU power. IC Role / Device Role / Timing Role: VR12.5-compliant controller supporting programmable ICCMAX and VBOOT for robust boot and fault containment in unattended systems. Use Value: Resistor-programmable limits and Power-Good signaling enable deterministic power sequencing and fail-safe operation in mission-critical embedded applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase CPU VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35203MTRPBF | Supports VR12/VR12.5 only; lacks VR12.6+ support and R3™ modulation; uses fixed-frequency PWM. | Targeted at legacy Intel platforms; not suitable for VR12.6+ dynamic VID extensions or enhanced light-load efficiency needs. | Choose when upgrading older VR12 designs where VR12.6+ features are unnecessary and cost is primary. |
| RT8803AZSP | Single-chip 3-phase solution with integrated high- and low-side drivers; no external driver required; supports VR12.6 but not VR12.6+. | Reduces external component count further but lacks programmable slew rate and VBOOT control of ISL95818IRTZ-T. | Prefer for simplified layout where VR12.6+ telemetry and fine-grained startup control are not required. |
Compared with IR35203MTRPBF and RT8803AZSP, the ISL95818IRTZ-T uniquely supports VR12.6+ specifications, includes R3™ variable-frequency modulation for superior transient response, and offers resistor-programmable VBOOT and slew rate-enabling tighter control over CPU power-up behavior and VID transitions in next-generation platforms.
Availability
ISL95818IRTZ-T is available at Aetrix Electronics and suitable for notebook computers, desktop computers, and embedded computing modules requiring stable component supply, long-term lifecycle support, and Intel VR12.5/VR12.6+ compliance.
Supply support for ISL95818IRTZ-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 ISL95818IRTZ-T belongs to Renesas' Multiphase Controllers product line, designed specifically to deliver Intel-compliant, high-accuracy, and thermally efficient CPU core power solutions for thin-client, gaming, and workstation platforms.
FAQ
What CPU generations does the ISL95818IRTZ-T support?
The ISL95818IRTZ-T fully complies with Intel VR12.5 and VR12.6+ specifications, supporting 3rd–10th Gen Intel Core processors, select Xeon E3/E5 derivatives, and compatible chipsets requiring dynamic VID updates, telemetry, and enhanced load-line accuracy. It is not intended for VR13 or newer specifications.
Does the ISL95818IRTZ-T require an external gate driver for 3-phase operation?
Yes - the ISL95818IRTZ-T integrates two gate drivers (PHASE1 and PHASE2) and requires one external driver connected to the PHASE3 terminal to implement full 3-phase operation. This architecture balances integration and flexibility for varying power stage configurations.
How does R3™ technology improve transient response in the ISL95818IRTZ-T?
R3™ technology in the ISL95818IRTZ-T enables variable-frequency PWM modulation that increases switching frequency during load transients, reducing output voltage deviation and settling time. Measured performance shows sub-10µs recovery from 50% load steps - significantly faster than fixed-frequency controllers like the IR35203MTRPBF.
Can the ISL95818IRTZ-T use both DCR and resistor current sensing simultaneously?
No - the ISL95818IRTZ-T supports either DCR-based sensing (with optional NTC compensation) or precision shunt resistor sensing, selected at design time via configuration pins and external component choices. Simultaneous use is not supported or electrically feasible per the datasheet.
What is the function of the ICCMAX pin on the ISL95818IRTZ-T?
The ICCMAX pin on the ISL95818IRTZ-T is a resistor-programmable input that sets the per-phase overcurrent protection threshold. A precision resistor between ICCMAX and GND defines the peak current limit, enabling robust MOSFET protection without external current-sense amplifiers or complex comparator circuits.
ISL95818IRTZ-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:
- Obsolete
- Applications:
- Controller, Intel VR12.5, VR12.6+
- Voltage - Input:
- 4.5V ~ 25V
- 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)
ISL95818IRTZ-T FAQ
1.How can I place an order for ISL95818IRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95818IRTZ-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 ISL95818IRTZ-T reliable?
The price and inventory of ISL95818IRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95818IRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95818IRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95818IRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95818IRTZ-T?
ISL95818IRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95818IRTZ-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 ISL95818IRTZ-T?
For technical support, including ISL95818IRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95818IRTZ-T requirements.
6.How does Aetrix verify that ISL95818IRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95818IRTZ-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 ISL95818IRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95818IRTZ-T?
All ISL95818IRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95818IRTZ-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 ISL95818IRTZ-T part is unused and in its original packaging.
Return procedure for ISL95818IRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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