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Renesas ISL6334DIRZ-T
- Part No.:
- ISL6334DIRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6334DIRZ-T.pdf
- Description:
- IC REG CTRLR VR11.1 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL6334DIRZ-T from Renesas Electronics (formerly Intersil) is a VR11.1-compliant 4-phase PWM controller for multiphase buck voltage regulators, featuring phase dropping, droop-disabled operation, and precision load current monitoring via IMON. It delivers ±0.5% closed-loop system accuracy over load/line/temperature, supports up to 1 MHz per-phase switching, and enables high-efficiency light-load operation using diode emulation under PSI# mode. It is used in high-performance CPU and memory VR applications requiring fast transient response and thermal-aware current sensing.
For engineers reviewing the ISL6334DIRZ-T datasheet, ISL6334DIRZ-T pinout, ISL6334DIRZ-T application, or ISL6334DIRZ-T equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, validated alternatives, and supply-chain support details specific to the -40°C to +85°C industrial-grade QFN variant with tape-and-reel packaging.
Technical Context
The ISL6334DIRZ-T implements proprietary Active Pulse Positioning (APP) and Adaptive Phase Alignment (APA) modulation to minimize output ripple and improve transient response without increasing capacitor count. It supports 1–4-phase operation with automatic phase adding/dropping triggered by the microprocessor's active-low PSI# signal, enabling dynamic reconfiguration between full- and reduced-phase modes.
Current sensing is performed differentially across either external sense resistors or inductor DCR, with integrated temperature compensation via TM/TCOMP pins and digitized NTC thermistor input. The controller provides bi-directional, adjustable voltage offset programming via OFS and supports Dynamic VID™ for seamless on-the-fly core voltage changes compliant with VR11.1 specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Regulation Accuracy | ±0.5% closed-loop system accuracy over load, line, and temperature (VID = 1V–1.6V, -40°C to +85°C) |
| Phase Count | Configurable 1–4-phase interleaved synchronous-buck control with automatic phase dropping on PSI# assertion |
| Switching Frequency | Adjustable up to 1 MHz per phase via external RT resistor (225–275 kHz typical at RT = 100 kΩ) |
| Current Sensing | Differential sensing on ISENx± pins for resistor or DCR-based current measurement; IMON pin outputs scaled load current |
| Thermal Monitoring | Integrated NTC-based VR temperature sensing via TM pin; VR_HOT and VR_FAN open-drain outputs with programmable trip thresholds |
| VID Interface | 8-bit VR11-compatible VID input with Dynamic VID™ support; VID0–VID7 pins accept standard microprocessor voltage identification codes |
| Package | 40-lead 6×6 mm QFN (JEDEC MO-220), RoHS-compliant, exposed thermal pad |
Pinout & Package
ISL6334DIRZ-T is housed in a 40-lead 6×6 mm QFN package (JEDEC MO-220, pkg drawing L40.6x6) with an exposed thermal pad on the underside connected internally to GND. The package is RoHS-compliant and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Core power supply input | +5 V ±5% main bias rail; POR threshold 4.3–4.5 V rising, 3.75–4.0 V falling |
| GND | Reference ground | Bias and regulation reference; bottom thermal pad is GND-connected |
| EN_PWR / EN_VTT | Threshold-sensitive enable inputs | 0.85 V rising / 0.75 V falling thresholds; used to coordinate startup with driver ICs or VTT rail |
| VDIFF / VSEN / RGND | Differential remote-sense interface | VSEN–RGND differential input converted to single-ended VDIFF for regulation and protection |
| PWM1–PWM4 | Phase gate-drive outputs | Four independent PWM outputs; phase count configured by tying PWM2/PWM3/PWM4 to VCC or GND |
| ISEN1±–ISEN4± | Per-phase current sense inputs | Differential inputs for resistor or DCR sensing; unused channels must be left open |
| IMON | Load current monitor output | Analog output proportional to total load current; clamped OCP trip at 1.11 V |
| PSI# | Processor sleep indication input | Active-low signal triggering 1-/2-phase operation and diode emulation for light-load efficiency |
| OFS | Offset programming input | Connect resistor to GND or VCC to generate bidirectional DAC offset (±400 mV typical) |
| TM / TCOMP | Thermal monitoring interface | TM accepts NTC voltage; TCOMP scales internal temp compensation gain for IMON and OCP |
Key Features
| Feature | Design Value |
|---|---|
| VR11.1 compliance with droop disabled | Meets Intel VR11.1 specification for CPU core voltage regulation without droop compensation |
| Active Pulse Positioning (APP) + APA modulation | Reduces output ripple amplitude and improves transient response without additional output capacitance |
| Dynamic phase management | Automatically adds/drops phases based on PSI# state, maintaining regulation while minimizing switching/core losses |
| Differential remote sensing | Eliminates ground potential difference between controller and load, improving regulation accuracy and OVP/UVP threshold stability |
| Integrated thermal compensation | Digitally scales IMON and overcurrent thresholds using NTC voltage to offset copper DCR drift over temperature |
| Programmable voltage offset | Bi-directional offset (±400 mV typical) set via OFS resistor, independent of VID code for fine-tuning margining |
Applications
| CPU Core Voltage Regulation | Memory Subsystem VR |
|---|---|
Use Scenario: Regulating core voltage for multi-core x86 processors in servers and workstations with rapid load transients up to 100 A/µs. IC Role / Device Role / Timing Role: Primary 4-phase PWM controller coordinating gate drivers, sensing load current via IMON, and reporting status via VR_RDY/VR_HOT. Use Value: Achieves ±0.5% regulation accuracy and sub-10 µs transient recovery using APP/APA, reducing bulk capacitor count by ≥30% vs. single-phase designs. | Use Scenario: Powering DDR4/DDR5 memory modules where tight voltage tolerance (±15 mV) and low-noise operation are critical. IC Role / Device Role / Timing Role: Multiphase VR controller supporting coupled-inductor topologies and PSI#-driven 2-phase light-load mode per JEDEC specifications. Use Value: Enables droop-disabled operation with precise DCR current sensing, eliminating need for discrete sense resistors and saving PCB area. |
| High-Density Compute Modules | Industrial Embedded Processors |
Use Scenario: Power delivery in space-constrained AI accelerators and FPGA-based compute cards requiring thermal-aware current limiting. IC Role / Device Role / Timing Role: 4-phase controller with integrated TM/TCOMP interface for real-time thermal compensation of current sense and OCP thresholds. Use Value: Maintains accurate current reporting across -40°C to +85°C ambient via NTC-based digitized thermal scaling, preventing false OCP trips. | Use Scenario: Reliable core power for ARM-based SoCs in ruggedized industrial gateways operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade VR controller with extended temperature range (-40°C to +85°C), robust enable sequencing (EN_PWR/EN_VTT), and fault-locked VR_RDY signaling. Use Value: Ensures stable startup coordination with companion drivers and failsafe undervoltage/overvoltage protection with 100 mV hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6334DCRZ | Same architecture and pinout; rated for 0°C to +70°C ambient only | Restricted to commercial-temperature computing applications (e.g., desktop motherboards) | Select ISL6334DCRZ only when industrial temperature range is not required and cost optimization is prioritized. |
| RTQ2134B-QA | 4-phase VR12.0/VR13-compliant controller; includes PMBus interface and digital telemetry | Supports telemetry readback and programmable parameters via SMBus; lacks PSI#-based phase dropping | Choose RTQ2134B-QA when digital configuration, fault logging, or VR12+/IMVP9 compatibility is required over VR11.1 compliance. |
Compared with ISL6334DCRZ, the ISL6334DIRZ-T offers extended temperature operation and identical electrical performance, while RTQ2134B-QA provides digital configurability at the expense of analog PSI# control and VR11.1 alignment - making ISL6334DIRZ-T optimal for legacy VR11.1 systems needing industrial reliability.
Availability
ISL6334DIRZ-T is available at Aetrix Electronics and suitable for CPU core regulation, memory subsystem VR, high-density compute modules, and industrial embedded processor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6334DIRZ-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 acquired Intersil in 2017 and maintains full support for its high-performance analog and power management portfolio.
The ISL6334DIRZ-T belongs to Renesas' VR11.x multiphase controller product line, designed specifically for high-efficiency, fast-transient CPU and memory voltage regulation in server, workstation, and industrial computing platforms.
FAQ
What is the operating temperature range of the ISL6334DIRZ-T?
The ISL6334DIRZ-T is rated for industrial operation from -40°C to +85°C ambient temperature, as confirmed in the FN6802 datasheet Absolute Maximum Ratings and Operating Conditions tables. This distinguishes it from the commercial-grade ISL6334DCRZ (0°C to +70°C) and makes it suitable for harsh-environment deployments where thermal margin is critical. The ISL6334DIRZ-T maintains ±0.6% system accuracy across this full range when regulating VID voltages between 1 V and 1.6 V.
How does the ISL6334DIRZ-T implement phase dropping during light-load conditions?
The ISL6334DIRZ-T uses the microprocessor's active-low PSI# signal to trigger automatic phase reduction: upon PSI# assertion, it transitions from 4-phase to 1- or 2-phase operation while enabling diode emulation to reduce magnetic core and switching losses. This behavior is intrinsic to the ISL6334DIRZ-T's VR11.1 compliance and is implemented in hardware without firmware intervention. The ISL6334DIRZ-T sustains regulation during the transition using APP/APA modulation and resumes full-phase operation immediately after PSI# de-assertion.
Can the ISL6334DIRZ-T sense current using inductor DCR instead of discrete resistors?
Yes, the ISL6334DIRZ-T supports both discrete resistor and DCR-based current sensing via its dedicated ISENx± differential inputs. For DCR sensing, ISENx- connects to the node between the inductor's DCR network and the phase node, while ISENx+ connects to the other end of the RC network. The ISL6334DIRZ-T's patented current sensing circuitry automatically compensates for DCR temperature drift using the TM/TCOMP interface, ensuring accurate channel-current balancing and OCP across temperature.
What is the function of the OFS pin on the ISL6334DIRZ-T?
The OFS pin on the ISL6334DIRZ-T enables bidirectional DC voltage offset programming between the DAC and REF pins. Connecting an external resistor from OFS to GND generates a negative offset (e.g., −400 mV typical), while connecting to VCC yields a positive offset (e.g., +400 mV typical). This offset is independent of the VID setting and allows precise margining of the output voltage during validation or field calibration. Leaving OFS unconnected disables offset functionality in the ISL6334DIRZ-T.
Does the ISL6334DIRZ-T support Dynamic VID™, and how is it implemented?
Yes, the ISL6334DIRZ-T fully supports Dynamic VID™ for on-the-fly core voltage changes per VR11.1 requirements. It decodes 8-bit VID codes (VID0–VID7) from the microprocessor and updates the DAC output accordingly. The internal soft-start circuitry ensures smooth transitions: VDAC first ramps from 0 V to 1.1 V, then tracks the new VID target, avoiding output glitches. This capability is built into the ISL6334DIRZ-T's DAC and VID decoder blocks and requires no external components beyond standard pull-up resistors on VID lines.
ISL6334DIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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)
ISL6334DIRZ-T FAQ
1.How can I place an order for ISL6334DIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6334DIRZ-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 ISL6334DIRZ-T reliable?
The price and inventory of ISL6334DIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6334DIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6334DIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6334DIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6334DIRZ-T?
ISL6334DIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6334DIRZ-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 ISL6334DIRZ-T?
For technical support, including ISL6334DIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6334DIRZ-T requirements.
6.How does Aetrix verify that ISL6334DIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6334DIRZ-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 ISL6334DIRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6334DIRZ-T?
All ISL6334DIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6334DIRZ-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 ISL6334DIRZ-T part is unused and in its original packaging.
Return procedure for ISL6334DIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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