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Renesas ISL6334AIRZ
- Part No.:
- ISL6334AIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6334AIRZ.pdf
- Description:
- IC REG CTRLR VR11.1 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
ISL6334AIRZ from Renesas (formerly Intersil) is a VR11.1-compliant 4-phase PWM controller for microprocessor core voltage regulation, featuring diode-emulation–disabled operation, ±0.6% closed-loop system accuracy over –40°C to +85°C, adjustable switching frequency up to 1 MHz per phase, and integrated thermal compensation via NTC sensing on the TM pin. It drives synchronous buck power stages in high-performance computing motherboards.
For engineers reviewing the ISL6334AIRZ datasheet, ISL6334AIRZ pinout, ISL6334AIRZ application, or ISL6334AIRZ equivalent, this page delivers verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options - all grounded in FN6482 Rev 3.00 and official ordering data.
Technical Context
The ISL6334AIRZ implements a 4-phase interleaved architecture with proprietary APP/APA modulation, enabling fast transient response without requiring output capacitor oversizing. Its current sensing supports both dedicated resistor and DCR-based methods, feeding droop control via FB pin current sourcing and enabling precise channel-current balancing.
Unlike the ISL6334IRZ, the ISL6334AIRZ omits diode emulation during PSI#-triggered light-load operation - it transmits standard CCM PWM to compatible drivers (e.g., ISL6612/ISL6614), eliminating dependency on VR11.1-specific gate drivers. Thermal monitoring uses digitized NTC voltage on TM to adjust current sense gain via TCOMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phases | 4-phase interleaved operation supporting coupled or discrete inductor topologies |
| VR Compliance | Fully compliant with Intel VR11.1 specification including Dynamic VID™ and IMON reporting |
| Accuracy | ±0.6% closed-loop system accuracy (VID = 1V–1.6V, –40°C to +85°C) |
| Switching Frequency | Adjustable up to 1 MHz per phase via external RT resistor (225–275 kHz typical at 100 kΩ) |
| Temp Range | –40°C to +85°C industrial operating range, validated per ordering table |
| Current Sensing | Dual-mode: precision resistor or inductor DCR; enables droop control, OCP, and channel balancing |
| Thermal Compensation | Integrated NTC-based temperature sensing via TM pin with internal digitization and TCOMP gain adjustment |
Pinout & Package
ISL6334AIRZ is housed in a RoHS-compliant 40-lead 6×6 mm QFN package (JEDEC MO-220, pkg drawing L40.6x6) with exposed thermal pad. Pin functions are validated per FN6482 Rev 3.00 Page 4 (Top View).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core supply input | +5 V ±5% main bias rail; POR activation at 4.3–4.5 V rising edge |
| GND | Reference ground | IC bias reference and thermal pad connection point (exposed underside) |
| EN_PWR / EN_VTT | Threshold-sensitive enable inputs | 0.85 V rising threshold; coordinate startup sequencing with 12 V and VTT rails |
| PWM1–PWM4 | Phase gate drive outputs | Four independent PWM signals driving synchronous buck high-side FETs |
| ISEN1+ / ISEN1− … ISEN4+ / ISEN4− | Differential current sense inputs | Four matched pairs for per-phase inductor DCR or resistor sensing |
| IMON | Load current monitor output | Analog current-proportional voltage (1.11 V nominal at full scale) for µP reporting |
| PSI# | Power state indicator input | Active-low signal triggering 1- or 2-phase operation under light load |
| TM | Thermistor interface | Analog input for NTC voltage; internally digitized for thermal compensation of current sense |
| FB | Feedback node | Sinks current proportional to sensed load current to set droop voltage across feedback resistor |
| VID0–VID7 | Microprocessor voltage ID inputs | 8-bit parallel interface accepting VR11.1-compliant VID codes for dynamic voltage setting |
Key Features
| Feature | Design Value |
|---|---|
| VR11.1 compliance | Full support for Dynamic VID™, IMON reporting, PSI#, and VR_RDY signaling per Intel spec |
| No diode emulation | PSI#-mode operation uses standard CCM PWM - compatible with ISL6612/ISL6614/ISL6596 drivers |
| Integrated thermal compensation | Digitized NTC reading on TM pin automatically adjusts current sense gain via TCOMP pin |
| 4-phase droop control | FB pin sinks current proportional to total load; enables precise load-line regulation without external op-amps |
| Differential remote sensing | VDIFF/VSEN pair eliminates ground potential differences between controller and CPU socket |
| Adjustable soft-start | Ramp rate programmable from 0.625 to 6.25 mV/µs via SS pin resistor network |
Applications
| Server CPU Voltage Regulator | Workstation Motherboard VR |
|---|---|
Use Scenario: High-current, multi-core Xeon or EPYC processors demanding tight voltage regulation under rapid load transients. IC Role / Device Role / Timing Role: Primary 4-phase VR controller managing core voltage, IMON reporting, and PSI#-driven phase shedding. Use Value: Achieves <±0.6% system accuracy across –40°C to +85°C while reducing output capacitance count by 30% vs. single-phase solutions. | Use Scenario: Dual-socket workstation platforms requiring coordinated startup, thermal-aware current limiting, and VR_RDY handshake with chipset. IC Role / Device Role / Timing Role: Core voltage controller with differential remote sensing, EN_PWR/EN_VTT sequencing, and VR_RDY assertion after soft-start completion. Use Value: Eliminates ground loop errors in long PCB traces and ensures reliable power-good signaling before CPU initialization. |
| AI Accelerator Board VR | High-Performance Computing Node |
Use Scenario: GPU or FPGA accelerator cards with bursty compute loads and strict thermal constraints. IC Role / Device Role / Timing Role: Phase-shedding controller using TM-sensed NTC voltage to dynamically adjust current sense gain and prevent thermal derating. Use Value: Maintains ±0.6% regulation accuracy while compensating for copper trace resistance drift and inductor DCR temperature coefficient. | Use Scenario: Dense rack-mounted HPC nodes where board space, efficiency, and reliability are critical. IC Role / Device Role / Timing Role: 4-phase VR managing >200 A core loads with integrated overcurrent protection on each phase and average OCP on IMON. Use Value: Reduces magnetic and switching losses at light load via 1-/2-phase operation - improving 10–20% efficiency at 10% load vs. fixed 4-phase mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-phase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6334IRZ | Includes diode emulation during PSI# mode; requires ISL6622/ISL6620 drivers for DCM operation | Targeted for legacy VR11.1 systems requiring strict diode emulation compatibility | Select ISL6334IRZ only if driver ICs support VR11.1-specific DCM protocol |
| RTQ2134B-QA | Automotive-grade AEC-Q100 qualified; supports 0.3–2.0 V output; no IMON reporting or VR_RDY | Designed for automotive ADAS SoCs, not desktop/server CPUs | Choose RTQ2134B-QA only for automotive environments requiring AEC-Q100 certification |
Compared with ISL6334IRZ, the ISL6334AIRZ simplifies driver selection by using standard CCM PWM during PSI# mode - avoiding proprietary DCM timing. Compared with RTQ2134B-QA, the ISL6334AIRZ provides full VR11.1 feature set (IMON, VR_RDY, Dynamic VID) essential for x86 server platforms.
Availability
ISL6334AIRZ is available at Aetrix Electronics and suitable for server motherboard design, workstation power delivery, AI accelerator board development, and high-performance computing node production requiring stable component supply across extended temperature ranges.
Supply support for ISL6334AIRZ 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 acquired Intersil in 2017 and maintains full support for the ISL6334AIRZ as part of its high-performance analog and power management portfolio.
The ISL6334AIRZ belongs to Renesas' VR11.x multiphase controller product line, engineered specifically for Intel-compatible microprocessor core voltage regulation in servers, workstations, and compute-intensive embedded systems.
FAQ
What is the key functional difference between ISL6334AIRZ and ISL6334IRZ?
The ISL6334AIRZ disables diode emulation during PSI#-activated light-load operation and outputs standard CCM PWM, making it compatible with general-purpose drivers like ISL6612/ISL6614. In contrast, the ISL6334IRZ requires VR11.1-specific drivers (e.g., ISL6622) to interpret its DCM protocol. This distinction is explicitly defined in Table 1 and the "Controller and Driver Recommendation" section of FN6482 Rev 3.00.
Does ISL6334AIRZ support differential remote voltage sensing?
Yes, the ISL6334AIRZ supports true differential remote sensing via dedicated VSEN and RGND pins. This architecture eliminates ground potential differences between the controller and CPU socket, improving regulation accuracy and overvoltage protection fidelity - a requirement for high-current VR designs documented in FN6482 Rev 3.00 Section "Remote-Sense Amplifier".
What thermal compensation method does ISL6334AIRZ use, and how is it implemented?
The ISL6334AIRZ uses an integrated NTC thermistor interface on the TM pin. The analog NTC voltage is internally digitized and used to adjust current-sense amplifier gain via the TCOMP pin - enabling real-time compensation of inductor DCR and sense resistor drift over temperature. This is confirmed in the "Thermal Monitoring and Temperature Compensation" sections of FN6482 Rev 3.00.
Can ISL6334AIRZ operate with only one or two phases active?
Yes, the ISL6334AIRZ supports 1-, 2-, 3-, or 4-phase operation. When PSI# is asserted low, it automatically drops to 1- or 2-phase mode depending on load level - maintaining regulation accuracy and efficiency at light loads. This behavior is specified in the "PWM and PSI# Operation" section and verified in Figure 3 of FN6482 Rev 3.00.
What is the purpose of the IMON pin on ISL6334AIRZ, and what voltage range does it output?
The IMON pin on ISL6334AIRZ provides an analog voltage proportional to total load current for microprocessor reporting. It outputs 1.11 V ±2.5% at full-scale current, with clamped OCP trip at 1.085–1.14 V - enabling precise load monitoring and overcurrent protection as defined in the "Current Sense Output" and "Electrical Specifications" tables of FN6482 Rev 3.00.
ISL6334AIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- 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)
ISL6334AIRZ FAQ
1.How can I place an order for ISL6334AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6334AIRZ 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 ISL6334AIRZ reliable?
The price and inventory of ISL6334AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6334AIRZ is usually 5 days.
3.What payment methods are accepted for ISL6334AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6334AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6334AIRZ?
ISL6334AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6334AIRZ 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 ISL6334AIRZ?
For technical support, including ISL6334AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6334AIRZ requirements.
6.How does Aetrix verify that ISL6334AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6334AIRZ 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 ISL6334AIRZ meets industry standards.
7.What is the process for return or replacement of ISL6334AIRZ?
All ISL6334AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6334AIRZ, 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 ISL6334AIRZ part is unused and in its original packaging.
Return procedure for ISL6334AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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