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Renesas ISL6333BCRZ-T
- Part No.:
- ISL6333BCRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6333BCRZ-T.pdf
- Description:
- IC REG CTRLR VR11 1OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,101
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Product details
Overview
ISL6333BCRZ-T from Renesas (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 IMON current monitoring, PSI#-enabled phase dropping, 8-bit VID input, ±0.5% system accuracy over temperature, and operates in 0°C to +70°C ambient. It targets high-efficiency CPU power delivery in desktop and server platforms.
For engineers reviewing the ISL6333BCRZ-T datasheet, ISL6333BCRZ-T pinout, ISL6333BCRZ-T application, or ISL6333BCRZ-T equivalent, this page delivers verified technical context, validated pin functions, confirmed VR11.1 compatibility, real-world transient response features (APP/APA), and two rigorously cross-checked alternative controllers for Intel CPU power stages.
Technical Context
The ISL6333BCRZ-T 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 Active Pulse Positioning (APP) modulation and Adaptive Phase Alignment (APA) circuitry deliver accelerated initial response to high di/dt load transients-reducing required bulk capacitance.
It integrates gate drivers with adaptive non-overlap timing (≤10 ns UGATE/LGATE turn-on delay), supports variable upper gate bias (5–12 V via PUVCC), and includes CPURST_N logic to simplify PSI# sequencing for Intel Eaglelake chipset platforms. The droop function is always enabled and routed through FB-not IDROOP-distinguishing it from ISL6333/ISL6333A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | Adjustable up to 1.0 MHz per phase; enables compact magnetics and high transient bandwidth. |
| System Accuracy | ±0.5% over temperature (1.0–1.6 V range); ensures tight CPU core voltage compliance under thermal stress. |
| VID Interface | 8-bit TTL-compatible input; directly selects VR11 DAC output voltages without external level-shifting. |
| Current Sensing | Fully differential DCR sensing with integrated programmable RISEN; eliminates external current sense resistors and improves noise immunity. |
| Protection Features | Multi-tiered overvoltage (VDAC + 175 mV), undervoltage (0.503×VDAC), and per-channel overcurrent trip (138 µA typical); safeguards CPU during fault conditions. |
| Operating Temp | 0°C to +70°C ambient; qualified for commercial-grade motherboard and server board environments. |
| Package | 48-lead 7×7 mm QFN with exposed thermal pad; supports high-power density layout and efficient heat dissipation. |
Pinout & Package
ISL6333BCRZ-T uses a 48-lead QFN (7×7 mm, 0.5 mm pitch) with exposed thermal pad (Pin 49 = GND). Pin functions are validated per FN6520 Rev 3.00, Pages 3 and 16–17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PSI# | Power State Indicator input | Triggers automatic phase dropping and diode emulation mode for light-load efficiency; requires no external pull-up. |
| CPURST_N | CPU reset signal input | Enables simplified PSI# sequencing for Intel Eaglelake platforms; eliminates need for external RC timing networks. |
| IMON | Average output current monitor | Provides analog voltage proportional to total load current; used for telemetry and thermal management. |
| VSEN / RGND | Differential remote sense inputs | Compensates for PCB IR drop between regulator and CPU VDD/VSS pins; maintains regulation accuracy at point-of-load. |
| ISEN1+/−, ISEN2+/−, ISEN3+/− | Per-phase DCR current sense inputs | Enable channel current balancing and accurate load-line programming without discrete sense resistors. |
| UGATE1/2/3, LGATE1/2/3 | Integrated MOSFET gate drivers | Drive high-side and low-side FETs directly; include shoot-through protection and adaptive non-overlap timing. |
| FB / COMP / REF | Error amplifier interface | Supports standard Type II/III compensation; REF connects internally to DAC output via 1 kΩ resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Intel VR11.1 Compliance | Full support for IMON, PSI#, 8-bit VID, dynamic VID compensation, and VR_RDY signaling per Intel specification. |
| CPURST_N Integration | Eliminates external circuitry needed for proper PSI# operation on Intel Eaglelake chipsets-reduces BOM count and layout complexity. |
| Always-Enabled Droop | Droop current flows out of FB pin (not IDROOP); simplifies design by removing droop-enable logic and associated routing. |
| APP + APA Transient Response | Reduces peak voltage deviation during CPU load steps; allows fewer bulk capacitors and lower system cost. |
| Integrated Gate Drivers | Three-phase driver stage with <20 ns rise/fall times and <10 ns adaptive non-overlap; enables high-frequency, high-efficiency operation. |
Applications
| Desktop CPU Power Delivery | Server Processor VRM |
|---|---|
Use Scenario: Regulating core voltage for dual-socket LGA1366 or LGA1156 platforms with Intel Core i7/i5 processors. IC Role / Device Role / Timing Role: Three-phase PWM controller managing synchronous buck conversion, phase alignment, and dynamic VID updates. Use Value: Achieves ±0.5% output accuracy and rapid transient response (<100 ns APP reaction) to meet Intel VR11.1 CPU load-step requirements. |
Use Scenario: High-current core rail (up to 120 A) for Xeon E5/E7 processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary voltage regulator IC coordinating three parallel power stages with remote sensing and thermal-aware phase shedding. Use Value: PSI#-driven single-phase operation at idle reduces quiescent power by >40%, extending platform energy efficiency. |
| Eaglelake Chipset Platform | VR11.1-Compatible Motherboard |
Use Scenario: Reference design for Intel Eaglelake P45/G45 chipsets requiring seamless PSI# coordination with CPU reset signals. IC Role / Device Role / Timing Role: VR11.1 controller using CPURST_N to synchronize low-power state entry/exit with chipset reset assertion. Use Value: Removes need for external RC timing networks and logic gates-reducing component count and improving timing margin. |
Use Scenario: ATX motherboard VRM delivering 0.6–1.5 V to LGA775 CPUs with dynamic VID scaling. IC Role / Device Role / Timing Role: Precision buck controller implementing differential remote sensing, droop-based load-line, and soft-start ramp control. Use Value: ±0.5% system accuracy over temperature ensures stable CPU operation across full industrial ambient range (0–70°C). |
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 |
|---|---|---|---|
| ISL6333CRZ-T | Lacks CPURST_N pin; droop enabled via IDROOP-to-FB connection; supports BYP1 LDO with adjustable PSI#-dependent output. | Requires external RC network for Eaglelake PSI# timing; suitable for legacy VR11.1 designs without chipset-specific reset coordination. | Select when CPURST_N integration is unnecessary and BYP1 LDO flexibility is preferred for Channel 1 gate drive. |
| ISL6333CIRZ-T | Same pinout and feature set as ISL6333BCRZ-T but rated for -40°C to +85°C; includes CPURST_N and always-enabled droop. | Validated for extended-temperature server and embedded computing environments where ambient exceeds +70°C. | Select for industrial or telecom applications requiring wider operating temperature range while retaining Eaglelake compatibility. |
Compared with ISL6333BCRZ-T, ISL6333CRZ-T lacks CPURST_N and requires manual droop configuration, whereas ISL6333CIRZ-T offers identical functionality with extended temperature rating-making it the direct upgrade path for harsh-environment deployments.
Availability
ISL6333BCRZ-T is available at Aetrix Electronics and suitable for desktop motherboard development, server VRM design, and Intel Eaglelake chipset platform integration requiring stable component supply and long-term production continuity.
Supply support for ISL6333BCRZ-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 ISL6333BCRZ-T belongs to Renesas' VR11.1-compliant multiphase controller family, engineered specifically for precision, high-efficiency CPU core voltage regulation in performance computing platforms.
FAQ
What is the primary function of the CPURST_N pin on the ISL6333BCRZ-T?
The CPURST_N pin on the ISL6333BCRZ-T synchronizes low-power state transitions with Intel Eaglelake chipset reset signaling, eliminating external RC timing circuits required for proper PSI# operation. This pin is unique to ISL6333B and ISL6333C variants and is not present on ISL6333 or ISL6333A. Its integration simplifies schematic design and improves timing reliability in VR11.1-compliant motherboards using the ISL6333BCRZ-T.
Does the ISL6333BCRZ-T support diode emulation mode, and how is it activated?
Yes, the ISL6333BCRZ-T supports diode emulation mode (DEM) during light-load conditions. It is automatically activated when the PSI# pin is driven low-triggering single-phase operation and DEM without requiring additional control signals. Unlike ISL6333, which enables DEM only when PSI# is low, the ISL6333BCRZ-T combines DEM with its always-enabled droop function routed through the FB pin, ensuring consistent efficiency optimization across all light-load states.
How does the ISL6333BCRZ-T implement current sensing without external resistors?
The ISL6333BCRZ-T uses fully differential, continuous DCR current sensing with integrated programmable current sense resistors. A single external resistor connected to the RSET pin configures the effective RISEN value for all three phases. This eliminates discrete current sense resistors while maintaining channel current balance and accurate load-line programming-verified in FN6520 Rev 3.00, Page 4 and Section "Fully Differential, Continuous DCR Current Sensing".
What is the role of the VDIFF pin on the ISL6333BCRZ-T?
The VDIFF pin on the ISL6333BCRZ-T outputs the differential voltage between VSEN and RGND-the sensed potential difference across the remote load. This signal feeds the internal error amplifier and is used for precision regulation feedback. It is not an independent measurement output; rather, it forms part of the closed-loop compensation network tied to FB and COMP, ensuring accurate point-of-load voltage regulation despite PCB trace resistance.
Can the ISL6333BCRZ-T operate in two-phase mode, and how is it configured?
Yes, the ISL6333BCRZ-T supports two-phase operation. It is configured by tying the ISEN3− pin to VCC, which disables Channel 3 and reassigns its control logic to maintain balanced operation across Phases 1 and 2. This configuration is explicitly documented in FN6520 Rev 3.00, Page 17 ("Functional Pin Descriptions") and preserves all key features-including APP, APA, PSI#-based phase shedding, and differential remote sensing-in the reduced-phase mode.
ISL6333BCRZ-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 VR11
- Voltage - Input:
- 5V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.5V ~ 1.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (7x7)
ISL6333BCRZ-T FAQ
1.How can I place an order for ISL6333BCRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6333BCRZ-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 ISL6333BCRZ-T reliable?
The price and inventory of ISL6333BCRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6333BCRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6333BCRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6333BCRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6333BCRZ-T?
ISL6333BCRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6333BCRZ-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 ISL6333BCRZ-T?
For technical support, including ISL6333BCRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6333BCRZ-T requirements.
6.How does Aetrix verify that ISL6333BCRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6333BCRZ-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 ISL6333BCRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6333BCRZ-T?
All ISL6333BCRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6333BCRZ-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 ISL6333BCRZ-T part is unused and in its original packaging.
Return procedure for ISL6333BCRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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