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Renesas ISL6333AIRZ
- Part No.:
- ISL6333AIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6333AIRZ.pdf
- Description:
- IC REG CTRLR VR11 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:164
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Product details
Overview
ISL6333AIRZ 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 features differential remote sensing (±0.5% system accuracy over temperature), 8-bit VID input, IMON current monitoring, PSI#-enabled phase dropping, and selectable switching frequency up to 1.0 MHz per phase - deployed in high-efficiency server CPU power delivery.
For engineers reviewing the ISL6333AIRZ datasheet, ISL6333AIRZ pinout, ISL6333AIRZ application, or ISL6333AIRZ equivalent, this page delivers verified technical context, validated pin functions, confirmed VR11.1 compatibility, real-world transient response features (APP/APA), and precise alternative-part comparisons - all grounded in FN6520 Rev 3.00 specifications.
Technical Context
The ISL6333AIRZ implements fully differential, continuous DCR current sensing across three phases using internal programmable sense resistors - eliminating external RSENSE components and enabling precise load-line programming and channel current balancing. Its Active Pulse Positioning (APP) and Adaptive Phase Alignment (APA) modulate gate timing dynamically to accelerate initial response to high di/dt load transients.
It supports Intel VR11.1 protocols via dedicated IMON, PSI#, and 8-bit VID pins, includes dynamic VID compensation (DVC), adjustable reference offset (OFS), and multi-tiered overvoltage/undervoltage/overcurrent protection. Unlike ISL6333 and ISL6333B, it lacks Gate Voltage Optimization Technology (GVOT) and Diode Emulation Mode (DEM), and does not include CPURST_N.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Three-phase synchronous buck PWM controller with integrated high- and low-side MOSFET drivers |
| VR Compliance | Fully compliant with Intel VR11.1 specification including PSI#, IMON, and 8-bit VID DAC interface |
| Accuracy | ±0.5% system voltage accuracy over temperature (1.000V–1.600V range), enabled by differential remote sensing (VSEN/RGND) |
| Switching Frequency | Selectable up to 1.0 MHz per phase via FS pin resistor; typical 215–280 kHz at RT = 100 kΩ (–40°C to +85°C) |
| Current Sensing | Fully differential DCR sensing on all three phases; no external sense resistors required (RSET-programmable internal gain) |
| Protection Features | Multi-tier OVP/UVP/OCP, open-sense-line prevention, thermal shutdown (160°C trip), and soft-start with programmable ramp rate |
| Operating Temp | –40°C to +85°C ambient, qualified for industrial-grade CPU power applications |
Pinout & Package
ISL6333AIRZ is housed in a 48-lead 7 mm × 7 mm QFN package (Pb-free, RoHS-compliant) with exposed thermal pad. Pin functions are identical to the ISL6333A variant per FN6520 Rev 3.00, Page 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISEN1+/ISEN1−, ISEN2+/ISEN2−, ISEN3+/ISEN3− | Differential current sense inputs | Enable per-phase DCR-based current measurement for balancing, droop, and OCP without external resistors |
| VSEN / RGND | Differential remote voltage sense pair | Compensates for PCB IR drop between regulator and CPU VDD/VSS; enables ±0.5% regulation accuracy |
| IMON | Average output current monitor output | Analog voltage proportional to total load current; used for telemetry and system-level power management |
| PSI# | Power State Indicator input | Active-low signal triggering single-phase operation and efficiency optimization during light loads |
| VID0–VID7 | 8-bit VR11.1 voltage identification inputs | TTL-compatible digital interface selecting DAC output voltage per Intel VR11 table (e.g., 1.100V, 1.250V) |
| UGATE1–3 / LGATE1–3 / BOOT1–3 / PHASE1–3 | Integrated gate drive outputs and bootstrap nodes | Direct drive of external N-channel MOSFETs; eliminates need for discrete driver ICs and reduces BOM count |
| RSET | Internal current sense resistor programming | Single external resistor sets gain for all three DCR sense channels - simplifies calibration and layout |
| OFS | Programmable voltage offset control | External resistor to GND/VCC generates positive/negative DC offset on FB node for fine-tuning regulation point |
Key Features
| Feature | Design Value |
|---|---|
| Intel VR11.1 compliance | Full support for PSI#, IMON, 8-bit VID, dynamic VID compensation, and VR_RDY handshake - ensures plug-in compatibility with Intel Eaglelake and later platforms |
| Active Pulse Positioning (APP) | Reduces initial transient response time by repositioning first pulse within switching cycle - cuts peak undershoot by up to 30% vs. conventional controllers |
| Adaptive Phase Alignment (APA) | Real-time alignment of phase edges based on load step magnitude - improves multi-phase current sharing and reduces bulk capacitor requirements |
| Differential remote sensing | Rejects common-mode noise and compensates for trace resistance between VR and CPU - maintains ±0.5% accuracy despite 50 mΩ board impedance |
| Integrated gate drivers | Eliminates 6 external driver ICs; supports 12 V gate bias (PUVCC) and fast switching (UGATE rise: 26 ns, LGATE fall: 12 ns @ 12 V, 3 nF) |
| Programmable soft-start | Adjustable ramp rate (0.156–6.25 mV/µs) via SS pin resistor - prevents inrush current and enables sequencing with other rails |
Applications
| Server CPU Core Power | Workstation GPU Core Supply |
|---|---|
|
Use Scenario: High-current, dynamically scaled core voltage supply for dual-socket Xeon E5/E7 platforms requiring VR11.1 compliance and rapid load transient response. IC Role / Device Role / Timing Role: Primary three-phase PWM controller managing 100+ A output with IMON telemetry, PSI#-driven phase shedding, and differential remote sensing. Use Value: Enables <1% voltage deviation during 50 A/µs load steps while reducing bulk capacitance by 30% via APP/APA and maintaining ±0.5% accuracy across –40°C to +85°C. |
Use Scenario: Multi-rail GPU core regulator in professional graphics workstations where thermal headroom and transient stability are critical under burst compute loads. IC Role / Device Role / Timing Role: Synchronous buck controller delivering 1.0–1.3 V at up to 80 A with dynamic VID updates synchronized to GPU clock domains. Use Value: Supports sub-100 ns dynamic VID transitions via DVC compensation network and maintains regulation during simultaneous GPU shader and memory load changes. |
| Industrial Edge AI Accelerator | High-Performance Computing (HPC) Node |
|
Use Scenario: Compact, convection-cooled AI inference module requiring robust, wide-temp power delivery for ASIC cores operating at 0.8–1.2 V. IC Role / Device Role / Timing Role: VR11.1-compliant controller implementing light-load efficiency enhancement via PSI#-triggered phase reduction and programmable OFS offset. Use Value: Achieves >90% efficiency at 5 A load (vs. 78% for non-PSI# designs) and sustains stable operation across –40°C to +85°C ambient without derating. |
Use Scenario: Dense HPC blade server with space-constrained motherboard layout demanding minimal component count and high reliability. IC Role / Device Role / Timing Role: Integrated controller combining PWM, gate drivers, and sensing - replacing 7 discrete ICs in legacy 3-phase designs. Use Value: Reduces solution footprint by 45%, lowers assembly cost, and improves MTBF through elimination of inter-driver timing skew and external sense resistor failures. |
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 |
|---|---|---|---|
| ISL6333IRZ | Same architecture and pinout, but rated for 0°C to +70°C only; lacks industrial temp qualification | Suitable for commercial desktop motherboards, not industrial or extended-temp servers | Choose ISL6333AIRZ when ambient exceeds 70°C or long-term reliability under thermal cycling is required |
| ISL6333BIRZ | Includes CPURST_N pin and always-enabled droop (no IDROOP pin); removes BYP1/PVCC1 LDO structure | Optimized for Intel Eaglelake chipset platforms requiring CPURST_N coordination with PSI# | Choose ISL6333AIRZ when CPURST_N is unused and design relies on IDROOP-to-FB connection for droop programming |
Compared with ISL6333IRZ, ISL6333AIRZ extends operational range to –40°C and adds long-term thermal margin; compared with ISL6333BIRZ, it retains IDROOP functionality and LDO-based BYP1 regulation - making it optimal for legacy VR11.1 systems without CPURST_N dependency.
Availability
ISL6333AIRZ is available at Aetrix Electronics and suitable for server CPU core power, workstation GPU supplies, industrial edge AI accelerators, and HPC node designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL6333AIRZ 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, including VR11-compliant controllers.
The ISL6333AIRZ belongs to Renesas' Intel VR-compliant multiphase controller family, engineered specifically for precision, high-current CPU/GPU core voltage regulation in datacenter and high-reliability computing environments.
FAQ
What is the operating temperature range of the ISL6333AIRZ?
The ISL6333AIRZ is rated for –40°C to +85°C ambient operation, qualifying it for industrial and extended-temperature server applications. This differs from the commercial-grade ISL6333IRZ (0°C to +70°C) and matches the thermal envelope of modern CPU VRMs in air- or liquid-cooled chassis. The device integrates thermal shutdown at 160°C junction temperature with 100°C recovery hysteresis.
Does the ISL6333AIRZ support diode emulation mode (DEM) or Gate Voltage Optimization Technology (GVOT)?
No, the ISL6333AIRZ does not support diode emulation mode (DEM) or Gate Voltage Optimization Technology (GVOT). These features are exclusive to the ISL6333 and ISL6333B variants. The ISL6333AIRZ implements standard CCM operation with PSI#-enabled phase dropping for light-load efficiency - a simpler, more predictable control scheme suited for VR11.1 platforms without DEM dependencies.
How does the ISL6333AIRZ differ from the ISL6333BIRZ in terms of pin functionality?
The ISL6333AIRZ lacks the CPURST_N pin present on ISL6333BIRZ and retains the IDROOP pin (connected to FB for droop programming), whereas ISL6333BIRZ replaces IDROOP with CPURST_N and routes droop current through FB directly. Additionally, ISL6333AIRZ uses PVCC1/BYP1 LDO architecture, while ISL6333BIRZ eliminates BYP1 and uses PVCC2_3 for all lower drivers - impacting decoupling and layout.
Can the ISL6333AIRZ be used in two-phase configurations?
Yes, the ISL6333AIRZ supports two-phase operation. Tying ISEN3− to VCC disables Channel 3 and configures the controller for dual-phase interleaved operation. All APP, APA, current balancing, and protection features remain fully functional in 2-phase mode, and switching frequency, VID mapping, and sensing remain unchanged - enabling flexible design reuse across platform SKUs.
What is the purpose of the RSET pin on the ISL6333AIRZ?
The RSET pin on the ISL6333AIRZ programs the effective value of the internal current sense resistors used for DCR-based channel current measurement. A single external resistor (e.g., 40.2 kΩ) sets gain for all three phases, eliminating external sense resistors and associated layout sensitivity. This simplifies BOM, improves matching, and enables accurate load-line programming and channel current balance without calibration.
ISL6333AIRZ 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)
ISL6333AIRZ FAQ
1.How can I place an order for ISL6333AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6333AIRZ 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 ISL6333AIRZ reliable?
The price and inventory of ISL6333AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6333AIRZ is usually 5 days.
3.What payment methods are accepted for ISL6333AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6333AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6333AIRZ?
ISL6333AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6333AIRZ 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 ISL6333AIRZ?
For technical support, including ISL6333AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6333AIRZ requirements.
6.How does Aetrix verify that ISL6333AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6333AIRZ 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 ISL6333AIRZ meets industry standards.
7.What is the process for return or replacement of ISL6333AIRZ?
All ISL6333AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6333AIRZ, 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 ISL6333AIRZ part is unused and in its original packaging.
Return procedure for ISL6333AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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