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Renesas ISL6333CIRZ
- Part No.:
- ISL6333CIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6333CIRZ.pdf
- Description:
- IC REG CTRLR VR11 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,356
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Product details
Overview
ISL6333CIRZ from Renesas Electronics (formerly Intersil) is a three-phase buck PWM controller with integrated MOSFET drivers, designed for Intel VR11.1-compliant microprocessor core voltage regulation. It supports -40°C to +85°C operation, features 8-bit VID input, IMON current monitoring, PSI#-enabled phase dropping, and CPURST_N for Eaglelake chipset compatibility.
For engineers reviewing the ISL6333CIRZ datasheet, ISL6333CIRZ pinout, ISL6333CIRZ application, or ISL6333CIRZ equivalent, this page delivers verified specifications, confirmed QFN-48 package mapping, validated pin functions, Intel VR11.1 system accuracy (±0.5% over temperature), and real-world design implications of APA/APP modulation and integrated DCR sensing.
Technical Context
The ISL6333CIRZ implements a fully differential, continuous DCR current sensing architecture across three phases, enabling precise load-line programming and channel current balancing without external sense resistors. Its Adaptive Phase Alignment (APA) and Active Pulse Positioning (APP) modulators deliver rapid response to high di/dt load transients, reducing bulk capacitor count.
Unlike ISL6333/ISL6333B, the ISL6333CIRZ omits Diode Emulation Mode and Gate Voltage Optimization Technology, and replaces the IDROOP pin with CPURST_N - a dedicated logic input for coordinated low-power state entry with Intel Eaglelake platforms. Droop compensation is always enabled via FB pin routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | -40°C to +85°C - qualified for industrial and embedded CPU power delivery in thermally demanding environments. |
| Switching Frequency | Up to 1.0 MHz per phase - enables compact magnetics and high transient bandwidth while supporting coupled-inductor operation. |
| System Accuracy | ±0.5% over temperature (1.0–1.6 V range) - ensures tight core voltage regulation under thermal stress for modern CPUs. |
| VID Interface | 8-bit TTL-compatible input - directly interfaces with Intel VR11 DAC tables for dynamic voltage scaling. |
| Current Sensing | Fully differential DCR sensing with programmable RSET - eliminates external sense resistors and supports accurate per-phase current balance. |
| Protection Features | Multi-tiered OVP/UVP/OCP, open-sense-line prevention, thermal shutdown at 160°C - safeguards CPU and power stage during fault conditions. |
| Gate Drive Capability | UGATE/LGATE rise/fall times ≤26 ns (12 V, 3 nF) - supports fast-switching GaN/Si MOSFETs with minimal dead-time loss. |
Pinout & Package
ISL6333CIRZ is housed in a 48-lead 7 mm × 7 mm QFN package (Pb-free, RoHS compliant) with exposed thermal pad. Pin numbering follows standard top-view orientation per FN6520 Rev 3.00, Page 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISEN1+/ISEN1- | Differential current sense inputs (Phase 1) | Connect to RC network across Phase 1 inductor for accurate DCR-based current measurement and balancing. |
| PSI# | Power State Indicator input | Logic-low signal triggers single-phase operation and light-load efficiency mode; requires coordination with CPURST_N on Eaglelake. |
| CPURST_N | Chipset reset coordination input | Enables synchronized low-power entry with Intel Eaglelake platform; eliminates external circuitry needed for PSI# timing compliance. |
| VID0–VID7 | VR11 DAC voltage identification inputs | Set output voltage per Intel VR11 table; internally pulled up to ~1.2 V, compatible with TTL logic levels. |
| VSEN/RGND | Differential remote voltage sense inputs | Compensate for IR drop between regulator and CPU die; enable ±0.5% system accuracy over PCB trace resistance. |
| IMON | Average output current monitor output | Analog voltage proportional to total load current - used for telemetry, thermal management, or system-level power budgeting. |
Key Features
| Feature | Design Value |
|---|---|
| Intel VR11.1 Compliance | Full support for VR11.1 protocols including PSI#, IMON, 8-bit VID, and dynamic VID compensation - ensures drop-in compatibility with Intel Core 2 Duo and later platforms. |
| Adaptive Phase Alignment (APA) | Adjusts phase timing dynamically to minimize initial transient undershoot - reduces required bulk capacitance by up to 30% in high-di/dt CPU loads. |
| Active Pulse Positioning (APP) | Repositions PWM pulses within switching cycle to accelerate response to sudden load steps - improves regulation during CPU turbo boost events. |
| Integrated DCR Current Sensing | Eliminates need for external current sense resistors; uses internal programmable gain and offset - lowers BOM cost and PCB area while maintaining <1% channel imbalance. |
| CPURST_N Integration | Removes requirement for external timing logic to coordinate PSI# with CPU reset - simplifies Eaglelake chipset interface and improves reliability of low-power state transitions. |
Applications
| Desktop CPU Power Delivery | Laptop VR11.1 Platform |
|---|---|
Use Scenario: Regulating core voltage for dual-core Intel processors in ATX desktop motherboards with discrete graphics and multi-phase VRMs. IC Role / Device Role / Timing Role: Primary three-phase PWM controller managing gate drive, current balancing, and dynamic VID scaling in real time. Use Value: Enables ±0.5% voltage accuracy across -40°C to +85°C ambient, meeting Intel VR11.1 spec while reducing component count via integrated drivers and DCR sensing. | Use Scenario: Powering mobile Intel Core processors in space-constrained laptop motherboards requiring thermal robustness and light-load efficiency. IC Role / Device Role / Timing Role: Three-phase buck controller with PSI#/CPURST_N coordination for adaptive phase shedding during C-states. Use Value: Achieves >90% efficiency at 1 A load via single-phase operation and eliminates external reset-timing circuitry using CPURST_N. |
| Embedded Industrial CPU Board | Server Blade VRM Module |
Use Scenario: Providing stable 1.0–1.5 V core supply to Intel Atom or Xeon-D processors in fanless industrial controllers. IC Role / Device Role / Timing Role: Precision voltage regulator with remote sensing, thermal shutdown, and overcurrent protection for unattended operation. Use Value: Differential VSEN/RGND sensing compensates for long PCB traces; 160°C thermal shutdown prevents field failures in sealed enclosures. | Use Scenario: High-density, multi-rail VRM on server blade boards supporting dual-socket Xeon processors with dynamic power capping. IC Role / Device Role / Timing Role: One of multiple ISL6333CIRZ controllers implementing parallel three-phase stages per CPU socket. Use Value: APA/APP modulation ensures sub-10 µs response to 50 A/µs load steps; IMON outputs feed centralized power management MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase VR11.1 buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6333AIRZ | Same pinout and package; operates from 0°C to +70°C; lacks CPURST_N; retains IDROOP pin. | Not suitable for Eaglelake or extended-temperature industrial use; requires external droop resistor network. | Select ISL6333AIRZ only for commercial-temp desktop VRMs where CPURST_N is unused and droop tuning is needed. |
| ISL6333BIRZ | Same temp range (-40°C to +85°C); includes CPURST_N and Gate Voltage Optimization; adds Diode Emulation Mode. | Delivers higher light-load efficiency than ISL6333CIRZ but requires different gate bias configuration and lacks OFS offset flexibility. | Choose ISL6333BIRZ when maximum low-load efficiency is critical and GaN/SiC upper FETs benefit from GVOT-driven VGS reduction. |
Compared with ISL6333AIRZ, ISL6333CIRZ adds CPURST_N for Eaglelake compatibility and removes IDROOP for simplified layout; compared with ISL6333BIRZ, it trades Diode Emulation Mode and GVOT for broader design flexibility in offset tuning and gate drive bias selection.
Availability
ISL6333CIRZ is available at Aetrix Electronics and suitable for desktop motherboard VRMs, laptop CPU power systems, embedded industrial controllers, and server blade VRM modules requiring stable component supply across extended temperature ranges.
Supply support for ISL6333CIRZ 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 ISL6333 family. Renesas is a global semiconductor leader focused on microcontrollers, analog, and power management solutions.
The ISL6333 series was developed by Intersil specifically for Intel VR11.1-compliant CPU core voltage regulation, emphasizing integration, transient response, and platform-specific features like PSI# and CPURST_N coordination.
FAQ
What is the operating temperature range for ISL6333CIRZ?
The ISL6333CIRZ is rated for operation from -40°C to +85°C ambient temperature, making it suitable for industrial, embedded, and high-performance computing applications where thermal margins exceed commercial-grade limits. This rating is confirmed in the FN6520 datasheet, Table "Recommended Operating Conditions", and applies specifically to the ISL6333CIRZ variant with IRZ suffix.
Does ISL6333CIRZ support Intel VR11.1 specifications?
Yes, ISL6333CIRZ fully supports Intel VR11.1 requirements, including 8-bit VID input decoding, IMON current monitoring, PSI#-driven phase dropping, differential remote sensing (VSEN/RGND), and dynamic VID compensation (DVC pin). These features are explicitly documented in the FN6520 datasheet introduction and feature list for the ISL6333C variant.
What is the function of the CPURST_N pin on ISL6333CIRZ?
The CPURST_N pin on ISL6333CIRZ is a dedicated digital input that coordinates low-power state entry with Intel Eaglelake chipsets. When asserted low alongside PSI#, it eliminates the need for external timing circuitry to meet Eaglelake's PSI# assertion window - a key differentiator from ISL6333/ISL6333A variants. This functionality is confirmed in the "Controller Descriptions and Comments" table on FN6520 Page 4.
How does ISL6333CIRZ implement current sensing without external resistors?
ISL6333CIRZ uses fully differential, continuous DCR current sensing with integrated programmable current sense resistors. A single external RSET resistor (e.g., 40.2 kΩ) sets the effective gain, and ISEN1+/−, ISEN2+/−, ISEN3+/− pins connect directly to RC networks across each phase inductor. No external shunt resistors are required - a capability confirmed in the "Features" section and Electrical Specifications table of FN6520.
What package type and pin count does ISL6333CIRZ use?
ISL6333CIRZ uses a 48-lead 7 mm × 7 mm QFN package with exposed thermal pad (Pb-free, RoHS compliant), designated as L48.7x7 in Intersil packaging drawings. Pinout matches the ISL6333C variant shown on FN6520 Page 4 (top view), and is identical across all ISL6333xIRZ temperature-grade variants.
ISL6333CIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VR11
- Voltage - Input:
- 5V ~ 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:
- 48-QFN (7x7)
ISL6333CIRZ FAQ
1.How can I place an order for ISL6333CIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6333CIRZ 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 ISL6333CIRZ reliable?
The price and inventory of ISL6333CIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6333CIRZ is usually 5 days.
3.What payment methods are accepted for ISL6333CIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6333CIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6333CIRZ?
ISL6333CIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6333CIRZ 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 ISL6333CIRZ?
For technical support, including ISL6333CIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6333CIRZ requirements.
6.How does Aetrix verify that ISL6333CIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6333CIRZ 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 ISL6333CIRZ meets industry standards.
7.What is the process for return or replacement of ISL6333CIRZ?
All ISL6333CIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6333CIRZ, 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 ISL6333CIRZ part is unused and in its original packaging.
Return procedure for ISL6333CIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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