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Renesas ISL6334IRZ-T
- Part No.:
- ISL6334IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6334IRZ-T.pdf
- Description:
- IC REG CTRLR VR11.1 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,055
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Product details
Overview
ISL6334IRZ-T from Renesas Electronics (formerly Intersil) is a VR11.1-compliant 4-phase PWM controller for microprocessor core voltage regulation, featuring active phase adding/dropping, diode emulation, ±0.5% closed-loop system accuracy over load/line/temperature, and precision DCR/resistor-based current sensing with IMON reporting. It targets high-performance CPU power delivery in server and desktop motherboards.
For engineers reviewing the ISL6334IRZ-T datasheet, ISL6334IRZ-T pinout, ISL6334IRZ-T application, or ISL6334IRZ-T equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options - all grounded in FN6482 Rev 3.00 and official Renesas documentation.
Technical Context
The ISL6334IRZ-T implements proprietary Active Pulse Positioning (APP) and Adaptive Phase Alignment (APA) modulation to minimize output ripple and enable sub-100ns transient response. It supports 1–4-phase interleaved operation with dynamic PSI#-triggered phase shedding and diode emulation for light-load efficiency.
It integrates differential remote sensing (VDIFF/VSEN), programmable droop via FB pin current sourcing, thermal monitoring via TM/TCOMP with NTC interface, and Dynamic VID™ for on-the-fly voltage changes. All four PWM outputs drive synchronous buck stages with independent current sense inputs (ISENx±) and channel-current balancing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phases | 4-phase interleaved PWM control with automatic 1-/2-phase operation under PSI# |
| VR Compliance | Fully compliant with Intel VR11.1 specification including Dynamic VID, IMON reporting, and PSI# handshake |
| System Accuracy | ±0.6% over load, line, and temperature (−40°C to +85°C) for VID 1.0–1.6V range |
| Switching Frequency | Adjustable up to 1 MHz per phase via external RT resistor (250 kHz typical at 100 kΩ) |
| Current Sensing | Dual-mode: precision DCR or discrete resistor sensing; IMON provides analog load current monitor output |
| Thermal Compensation | Integrated NTC-based temperature compensation via TM/TCOMP pins with internal digitization |
| Package | 40-lead 6×6 mm QFN (JEDEC MO-220), RoHS-compliant, exposed thermal pad |
Pinout & Package
ISL6334IRZ-T is housed in a 40-lead 6×6 mm QFN package (JEDEC MO-220, pkg drawing L40.6x6) with an exposed thermal pad for enhanced heat dissipation. Pin numbering follows top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core supply input | +5 V ±5% main bias rail; POR threshold 4.4 V rising / 3.88 V falling |
| GND | Reference ground | IC bias reference; bottom-exposed pad must be soldered to PCB ground plane |
| VID0–VID7 | Microprocessor voltage ID inputs | 8-bit parallel VID bus; supports Dynamic VID™ for real-time voltage adjustment |
| PSI# | Power state indicator input | Active-low signal triggering 1-/2-phase operation with diode emulation (ISL6334 variant only) |
| IMON | Load current monitor output | Analog voltage proportional to total output current; used by CPU for telemetry and protection |
| ISEN1±–ISEN4± | Per-phase current sense inputs | Differential inputs for DCR or resistor-based current sensing; enable channel balancing and OCP |
| PWM1–PWM4 | Gate drive outputs | Four independent PWM signals driving external MOSFET drivers (e.g., ISL6622/ISL6612) |
| FB | Feedback reference node | Sinks current to set droop slope; precision voltage drop across feedback resistor enables load-line regulation |
| TM / TCOMP | Thermal monitoring interface | TM accepts NTC voltage; TCOMP outputs compensated current for integrated thermal compensation |
| VR_RDY | Regulator ready status | Open-drain output signaling valid output voltage; asserts after soft-start and VID lock |
Key Features
| Feature | Design Value |
|---|---|
| Active Pulse Positioning (APP) | Reduces output ripple amplitude and improves transient response by optimizing pulse timing across phases |
| Adaptive Phase Alignment (APA) | Minimizes inter-phase current imbalance and enhances efficiency under dynamic load steps |
| Diode Emulation Mode | Enables discontinuous conduction mode during light load (PSI# asserted), reducing switching and core losses |
| Differential Remote Sensing | Eliminates IR drop error between local and remote grounds; improves regulation accuracy at CPU socket |
| Integrated Thermal Compensation | Digitizes NTC voltage internally and adjusts current sense gain to maintain accuracy across temperature |
| Bi-directional Offset Programming | OFS pin allows precise voltage offset addition/subtraction independent of VID setting for margining or calibration |
Applications
| Server CPU Power Delivery | Desktop Motherboard VRM |
|---|---|
|
Use Scenario: Regulating core voltage for dual-socket Xeon Scalable processors under rapid 50A/µs load transients. IC Role / Device Role / Timing Role: Primary 4-phase VR11.1 controller coordinating phase shedding, IMON reporting, and PSI#-driven efficiency modes. Use Value: Achieves <±0.6% regulation accuracy and sub-100ns transient recovery using APP/APA, reducing bulk capacitance by 30% vs. single-phase designs. |
Use Scenario: Delivering tightly regulated 1.0–1.4V core power to Intel Core i9 processors with dynamic frequency scaling. IC Role / Device Role / Timing Role: VR11.1-compliant PWM controller managing droop, thermal compensation, and Dynamic VID updates during Turbo Boost events. Use Value: Enables precise load-line programming via FB current sink and maintains ±0.5% accuracy across −40°C to +85°C ambient. |
| Workstation GPU Core Supply | High-Performance AI Accelerator VRM |
|
Use Scenario: Powering AMD Radeon Pro or NVIDIA Quadro GPUs requiring stable 0.8–1.2V core rails with fast transient response. IC Role / Device Role / Timing Role: Multiphase controller implementing DCR current sensing and remote sensing to compensate for PCB trace resistance. Use Value: Delivers accurate channel-current balancing and average overcurrent protection without external op-amps or ADCs. |
Use Scenario: Supporting PCIe-based AI accelerators (e.g., Intel Gaudi, AMD Instinct) with bursty 100+ A load profiles. IC Role / Device Role / Timing Role: High-bandwidth VR controller using four PWM outputs and integrated thermal monitoring to prevent thermal throttling. Use Value: Uses TM/TCOMP interface with NTC thermistor to dynamically adjust current sense gain, maintaining OCP accuracy within ±3% from −40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6334AIRZ-T | No diode emulation; uses standard CCM PWM during PSI# mode; same pinout and VID interface | Suitable where driver ICs lack DE support (e.g., ISL6612/ISL6596); lower light-load efficiency than ISL6334IRZ-T | Select ISL6334AIRZ-T when using non-DE-capable drivers or when diode emulation is not required for system efficiency targets. |
| RT8803AGQW | 6-phase capable; supports Intel VR12.0/VR13; no integrated thermal compensation; different pinout and VID mapping | Targeted at newer CPU platforms requiring higher phase count and VR12+/VR13 compliance; not drop-in compatible | Choose RT8803AGQW only for VR12.0+ designs; requires full schematic and layout revision due to pinout and feature differences. |
Compared with ISL6334AIRZ-T and RT8803AGQW, the ISL6334IRZ-T uniquely combines VR11.1 compliance, integrated diode emulation, and on-die thermal compensation - making it optimal for legacy high-efficiency server/desktop VRMs where PSI#-driven light-load optimization is critical.
Availability
ISL6334IRZ-T is available at Aetrix Electronics and suitable for server CPU power delivery, desktop motherboard VRMs, workstation GPU core supplies, and high-performance AI accelerator VRMs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6334IRZ-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 continues to support its high-performance analog and power management portfolio, including VR controllers for computing infrastructure.
The ISL6334IRZ-T belongs to Renesas' VR11.x multiphase controller product line, designed specifically for Intel-compatible microprocessor core voltage regulation with emphasis on transient response, light-load efficiency, and system-level telemetry integration.
FAQ
What is the operating temperature range for the ISL6334IRZ-T?
The ISL6334IRZ-T is rated for −40°C to +85°C ambient operation, as specified in the FN6482 datasheet under "Operating Conditions." This industrial-grade temperature range ensures reliable performance in server chassis and high-end desktop environments where thermal margins are constrained. The device's integrated thermal compensation maintains current-sense accuracy across this full range via the TM and TCOMP pins.
Does the ISL6334IRZ-T support diode emulation, and how is it activated?
Yes, the ISL6334IRZ-T supports diode emulation exclusively during PSI#-asserted low-power mode. When PSI# is driven low, the controller drops inactive phases and configures the remaining active channel(s) to transmit a special PWM protocol recognized only by DE-capable drivers like ISL6622/ISL6620. This enables discontinuous conduction mode, reducing switching and magnetic core losses at light loads - a key efficiency feature distinguishing ISL6334IRZ-T from the ISL6334AIRZ-T variant.
How does the ISL6334IRZ-T achieve ±0.5% system accuracy over temperature?
The ISL6334IRZ-T achieves ±0.5% closed-loop system accuracy (for VID 1.0–1.6V) through three integrated mechanisms: (1) differential remote sensing (VDIFF/VSEN) eliminating PCB ground shift errors, (2) precision DAC-based VID decoding with Dynamic VID™ support, and (3) on-die thermal compensation that digitizes NTC voltage via TM and adjusts current-sense gain in real time via TCOMP. These features collectively maintain regulation fidelity across −40°C to +85°C without external calibration.
Can the ISL6334IRZ-T be used with DCR current sensing, and what design considerations apply?
Yes, the ISL6334IRZ-T supports both discrete resistor and DCR-based current sensing via its ISENx± differential inputs. For DCR sensing, the controller measures voltage across the inductor's DC resistance and uses internal gain/offset calibration to derive accurate phase current. Designers must select inductors with stable, low-TCR DCR and ensure Kelvin connections to ISENx± pins. The datasheet specifies 36.5–42 µA sensed current tolerance at 40 µA input, confirming high-fidelity DCR implementation capability.
What is the function of the OFS pin on the ISL6334IRZ-T, and how is it configured?
The OFS (Offset) pin on the ISL6334IRZ-T enables bi-directional, VID-independent voltage offset programming - critical for margining, calibration, or compensating board-level tolerances. When connected to ground via a resistor, OFS sets a positive offset (390–415 mV typical); when tied to VCC, it sets a negative offset (1.574–1.635 V below VCC). This allows fine-tuning of output voltage without altering the VID code, supporting factory test modes and adaptive voltage scaling in production systems.
ISL6334IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR11.1
- Voltage - Input:
- 3V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.5V ~ 1.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6334IRZ-T FAQ
1.How can I place an order for ISL6334IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6334IRZ-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 ISL6334IRZ-T reliable?
The price and inventory of ISL6334IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6334IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6334IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6334IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6334IRZ-T?
ISL6334IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6334IRZ-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 ISL6334IRZ-T?
For technical support, including ISL6334IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6334IRZ-T requirements.
6.How does Aetrix verify that ISL6334IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6334IRZ-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 ISL6334IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6334IRZ-T?
All ISL6334IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6334IRZ-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 ISL6334IRZ-T part is unused and in its original packaging.
Return procedure for ISL6334IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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