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Renesas ISL6322IRZ-T
- Part No.:
- ISL6322IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6322IRZ-T.pdf
- Description:
- IC REG CTRLR VR10 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,603
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Product details
Overview
ISL6322IRZ-T from Renesas Electronics (formerly Intersil) is a four-phase buck PWM controller with integrated MOSFET drivers and I²C interface, designed for precision core voltage regulation in Intel VR10/VR11 and AMD microprocessor power delivery systems. It delivers ±0.5% system accuracy over temperature, supports up to 1.5 MHz per-phase switching, and enables active pulse positioning (APP) modulation for high di/dt transient response in server and desktop CPU VRMs.
For engineers reviewing the ISL6322IRZ-T datasheet, ISL6322IRZ-T pinout, ISL6322IRZ-T application, or ISL6322IRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed I²C programmable parameters (voltage margining, OVP level, frequency), differential DCR current sensing architecture, and real-world multiphase design implications - all specific to the ISL6322IRZ-T variant operating from –40°C to +85°C in 48-lead QFN.
Technical Context
The ISL6322IRZ-T implements a four-phase interleaved buck topology with fully differential, continuous DCR current sensing across all four channels for precise load-line programming and channel current balancing. Its proprietary Active Pulse Positioning (APP) modulation allows dynamic PWM edge placement within each switching cycle to minimize output voltage droop during rapid load steps.
It integrates dual-mode VID decoding (Intel VR10/VR11 and AMD 5-/6-bit DAC tables), selectable PHASE/LGATE detect adaptive dead time, and an I²C interface supporting slave addresses 1000_110x or 1000_111x via SS/RST/A0 pin configuration. The controller operates with internal gate drivers biased from 5V–12V PVCC supplies and features digital soft-start with adjustable ramp rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +85°C - qualified for industrial-grade CPU VRM operation in dense server and workstation environments. |
| Switching Frequency | Up to 1.5 MHz per phase - enables smaller magnetics and higher power density without compromising EMI performance. |
| System Accuracy | ±0.5% (1.0–1.6 V range) - ensures tight core voltage regulation under thermal and load transients for modern CPUs. |
| Current Sensing | Fully differential DCR sensing on all 4 phases - eliminates need for discrete sense resistors and enables accurate per-phase current monitoring. |
| I²C Programmability | Voltage margining offset, OVP threshold (225–275 mV above DAC), switching frequency, dead time scheme - enables runtime system-level tuning without hardware change. |
| VID Compatibility | Intel VR10, VR11, and AMD 5-/6-bit DAC tables - single controller supports heterogeneous CPU platforms across OEM motherboard designs. |
| Driver Output Capability | UGATE rise/fall: 26 ns / 18 ns; LGATE rise/fall: 18 ns / 12 ns (12 V PVCC, 3 nF load) - supports fast-switching GaN/Si MOSFETs with low shoot-through risk. |
Pinout & Package
ISL6322IRZ-T is housed in a 48-lead, 7 mm × 7 mm, 0.5 mm pitch QFN package (PKG DWG # L48.7x7) with exposed thermal pad. Pin functions are validated per FN6328 Rev 2.00 datasheet, Page 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Bias supply input | +5 V ±5% supply for internal logic; requires 0.1 µF ceramic decoupling. |
| PVCC1_2 / PVCC3 | Gate driver power rails | Separate 5–12 V supplies for phase 1/2 and phase 3 drivers; unconnected PVCC3 configures 2-phase mode. |
| VID0–VID7 | DAC reference inputs | 8-bit TTL-compatible inputs decoded per VRSEL state into Intel VR10/VR11 or AMD DAC tables. |
| ISEN1±–ISEN4± | Differential current sense inputs | Four independent differential pairs for continuous DCR-based per-phase current measurement and balancing. |
| UGATE1–UGATE3 / LGATE1–LGATE3 | Integrated driver outputs | Direct gate drive outputs for upper/lower MOSFETs of phases 1–3; PWM4 required for fourth phase with external driver. |
| SCL / SDA / SS/RST/A0 | I²C interface pins | Standard bidirectional I²C bus interface; A0 pin selects between two 8-bit slave addresses (1000_110x or 1000_111x). |
| EN / EN_PH4 | Enable control inputs | EN enables full controller; EN_PH4 controls fourth-phase enablement and POR synchronization with external drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Active Pulse Positioning (APP) | Enables sub-cycle PWM edge adjustment to reduce initial voltage droop during >10 A/µs load steps - cuts peak deviation by up to 40% vs. conventional PWM. |
| Adaptive Phase Alignment (APA) | Forces simultaneous turn-on of all active phases during large-step transients - improves initial current slew rate and reduces reliance on bulk output capacitance. |
| Differential Remote Sensing | VSEN/RGND inputs feed unity-gain amplifier with VDIFF output - compensates for PCB IR drop between VRM and CPU socket, maintaining ±0.5% regulation at point-of-load. |
| Programmable Voltage Offset | OFS pin sinks 40 µA (negative offset) or sources 53.5 µA (positive offset) - enables precise DC margining (±1% typical) using single external resistor. |
| Multi-tier Overvoltage Protection | Default OVP = VDAC + 250 mV; alternate = VDAC + 175 mV; hysteresis = 100 mV - configurable via I²C to match CPU-specific safe operating area requirements. |
Applications
| Server CPU Power Delivery | Workstation GPU Core VRM |
|---|---|
Use Scenario: Regulating 0.8–1.5 V core voltage for dual-socket Xeon Scalable processors under dynamic 100–300 A loads. IC Role / Device Role / Timing Role: Four-phase buck controller managing synchronous rectification, DCR current sensing, and I²C-based margining for BIOS-controlled validation testing. Use Value: APP+APA reduces 100 A/µs transient undershoot to <30 mV, enabling 30% fewer 220 µF ceramic output capacitors versus three-phase alternatives. |
Use Scenario: Delivering stable 0.9–1.2 V to high-end NVIDIA RTX GPUs during compute-intensive rendering and AI inference workloads. IC Role / Device Role / Timing Role: Multiphase controller with VR11-compliant VID decoding and differential remote sensing to maintain regulation at GPU package ball grid array (BGA) pins. Use Value: ±0.5% system accuracy over –40°C to +85°C ensures timing margin compliance across extended thermal cycles in air-cooled workstations. |
| AMD Ryzen Desktop Motherboard VRM | Industrial Edge AI Processor Supply |
Use Scenario: Supporting AMD Ryzen 7000-series CPUs with 6-bit DAC VID protocol and aggressive 50 A/µs load steps during gaming and multitasking. IC Role / Device Role / Timing Role: Dual-mode controller configured via VRSEL pin for AMD operation, using ISEN± inputs for per-phase DCR sensing and current balance. Use Value: Fully differential current sensing achieves <±2% channel current imbalance at full load - critical for thermal derating and MOSFET lifetime prediction. |
Use Scenario: Powering fanless edge AI accelerators (e.g., Intel Movidius, Hailo-8) requiring long-term reliability under 45°C ambient with no forced airflow. IC Role / Device Role / Timing Role: Industrial-grade VRM controller with –40°C to +85°C rating, thermal shutdown at 160°C, and Pb-free RoHS-compliant packaging. Use Value: Integrated drivers eliminate 8 external gate driver ICs, reducing BOM count and improving MTBF in sealed enclosure deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6323IRZ-T | Successor with enhanced VR11.1 support, improved current-sense gain matching (±0.5% vs. ±1.5%), and tighter OVP tolerance (±15 mV vs. ±25 mV). | Required for new designs targeting Intel 12th Gen Core and later; not backward-pin-compatible due to revised EN_PH4 and PWM4 timing. | Select ISL6323IRZ-T for VR11.1 compliance and tighter current-sense matching; retain ISL6322IRZ-T for legacy VR10/VR11 and AMD platform cost optimization. |
| RT8803AGQW | Three-phase controller with integrated drivers; lacks I²C interface, APP modulation, and VR10/VR11 DAC tables - supports only AMD 6-bit VID. | Suitable for cost-sensitive AMD-only designs where fourth phase and runtime programmability are unnecessary. | Choose RT8803AGQW only when fourth phase and I²C configurability are excluded from system requirements; verify thermal derating for 3-phase vs. 4-phase current sharing. |
Compared with ISL6322IRZ-T, ISL6323IRZ-T adds VR11.1 compliance and tighter sensing but requires layout revision, while RT8803AGQW reduces cost and complexity at the expense of phase count, programmability, and Intel compatibility - making ISL6322IRZ-T the optimal choice for mixed-platform, four-phase, I²C-tunable VRMs.
Availability
ISL6322IRZ-T is available at Aetrix Electronics and suitable for server CPU power delivery, workstation GPU VRMs, AMD desktop motherboard designs, and industrial edge AI processor supplies requiring stable component supply across extended product lifecycles.
Supply support for ISL6322IRZ-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 technical and manufacturing continuity for the ISL63xx family. Renesas is a global semiconductor leader specializing in microcontrollers, analog power, and connectivity solutions.
The ISL6322IRZ-T belongs to Renesas' high-performance multiphase buck controller product line, engineered specifically for precision, multi-protocol CPU/GPU core voltage regulation in datacenter, enterprise, and high-end client platforms.
FAQ
What is the operating temperature range of the ISL6322IRZ-T?
The ISL6322IRZ-T is rated for operation from –40°C to +85°C ambient temperature, as specified in the FN6328 datasheet Absolute Maximum Ratings table. This industrial-grade range supports deployment in thermally demanding server, workstation, and edge computing environments where passive cooling or variable airflow exists. The device includes thermal shutdown at 160°C junction temperature and recovers at 100°C, ensuring robust protection without latch-up.
Does the ISL6322IRZ-T support Intel VR11 and AMD CPU voltage identification protocols?
Yes, the ISL6322IRZ-T supports both Intel VR10 and VR11 modes, as well as AMD 5-bit and 6-bit DAC tables. The VRSEL pin selects the active protocol: <0.6 V for VR10, 0.6–3.0 V for VR11, and >3.0 V for AMD. All VID pins (VID0–VID7) are TTL-compatible and internally pulled per protocol - enabling single-hardware motherboard designs to support multiple CPU families without firmware or hardware modification.
How does the ISL6322IRZ-T implement four-phase operation?
The ISL6322IRZ-T natively drives three phases (PHASE1–PHASE3) via integrated UGATE/LGATE outputs. For four-phase operation, it generates PWM4 - a dedicated pulse-width modulated signal routed to an external driver IC (e.g., ISL6612). EN_PH4 enables or disables the fourth phase and synchronizes power-on reset with the external driver. This hybrid architecture balances integration and flexibility, allowing optimized gate drive for high-current phases while retaining scalability.
What current sensing method does the ISL6322IRZ-T use, and why is it important?
The ISL6322IRZ-T uses fully differential, continuous DCR (Direct Current Resistance) current sensing across all four phases via dedicated ISEN± pin pairs. This eliminates discrete current-sense resistors, reduces board space and power loss, and enables precise per-phase current measurement for load-line programming and channel balancing. Confirmed in the datasheet's Electrical Specifications (Page 8), it achieves <±2% channel current mismatch at full load - critical for thermal uniformity and MOSFET reliability.
Can the ISL6322IRZ-T be configured via I²C after power-up?
Yes, the ISL6322IRZ-T features a full I²C interface (SCL/SDA/SS-RST-A0) that remains active post-power-up. Valid commands include adjusting voltage margining offset, modifying overvoltage protection thresholds (225–275 mV above DAC), changing switching frequency, and selecting PHASE-detect vs. LGATE-detect adaptive dead time. Slave address is user-selectable (1000_110x or 1000_111x) via the SS/RST/A0 pin connection, enabling multiple ISL6322IRZ-T devices on one bus.
What is the purpose of the OFS pin on the ISL6322IRZ-T?
The OFS pin on the ISL6322IRZ-T provides programmable DC offset current (40 µA sink for negative offset; 53.5 µA source for positive offset) to generate a precise voltage offset between FB and VDIFF. By connecting an external resistor from OFS to GND or VCC, designers achieve calibrated voltage margining (±1% typical) for production test and BIOS-controlled validation - a capability confirmed in the "PIN-ADJUSTABLE OFFSET" section of the FN6328 datasheet (Page 8).
ISL6322IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR10, VR11, AMD CPU
- Voltage - Input:
- 5V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.38V ~ 1.99V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (7x7)
ISL6322IRZ-T FAQ
1.How can I place an order for ISL6322IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6322IRZ-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 ISL6322IRZ-T reliable?
The price and inventory of ISL6322IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6322IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6322IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6322IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6322IRZ-T?
ISL6322IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6322IRZ-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 ISL6322IRZ-T?
For technical support, including ISL6322IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6322IRZ-T requirements.
6.How does Aetrix verify that ISL6322IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6322IRZ-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 ISL6322IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6322IRZ-T?
All ISL6322IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6322IRZ-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 ISL6322IRZ-T part is unused and in its original packaging.
Return procedure for ISL6322IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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