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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Renesas ISL6333AIRZ-T

Name: ISL6333AIRZ-T
Brand: Renesas
SKU: ISL6333AIRZ-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL6333AIRZ-T

Manufacturer:: Renesas

Category:: Special Purpose Regulators

Package:: 48-VFQFN Exposed Pad

Datasheet:: ISL6333AIRZ-T.pdf

Description:: IC REG CTRLR VR11 1OUT 48QFN

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Product details

Overview

ISL6333AIRZ-T 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 delivers ±0.5% system accuracy over temperature, supports 8-bit VID input for DAC-based voltage selection, and features IMON current monitoring and PSI#-enabled phase dropping for light-load efficiency enhancement in server and desktop CPU power delivery.

For engineers reviewing the ISL6333AIRZ-T datasheet, ISL6333AIRZ-T pinout, ISL6333AIRZ-T application, or ISL6333AIRZ-T equivalent, this device is selected for high-accuracy, multi-phase VR11.1 power stages requiring differential remote sensing, DCR-based current sensing, Active Pulse Positioning (APP), and Adaptive Phase Alignment (APA) for fast transient response in advanced CPU/GPU VRMs.

Technical Context

The ISL6333AIRZ-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 integrated gate drivers support variable upper-drive bias (5V–12V) and feature adaptive non-overlap timing (≤10 ns) to prevent shoot-through.

It embeds an 8-bit VR11 DAC with dynamic VID compensation, programmable soft-start ramp rate (0.156–6.25 mV/µs), and multi-tiered protection including per-channel overcurrent detection (138 µA typical trip), overvoltage (VDAC + 175 mV), and undervoltage (0.503×VDAC) thresholds - all optimized for Intel Eaglelake-era and later CPU platforms.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Three-phase synchronous buck PWM controller with integrated high- and low-side gate drivers
Input Voltage Range	VCC = 4.75–5.25 V; PVCC = 5–12 V; supports coupled or standard inductor operation
Output Accuracy	±0.5% over temperature (1.0–1.6 V range); ±1.0% (0.6–1.0 V); ±2.0% (0.4–0.6 V)
Switching Frequency	Adjustable 80 kHz to 1.0 MHz per phase; 215–280 kHz typical at RT = 100 kΩ (–40°C to +85°C)
Current Sensing	Fully differential DCR sensing; no external R_SENSE; R_SET-programmable gain; IDROOP pin for droop programming
Protection Features	Per-phase OCP (138 µA avg trip), OV/UV lockout, thermal shutdown (160°C), open-sense-line prevention, and PSI#-triggered phase drop
VID Interface	8-bit TTL-compatible VID inputs compliant with Intel VR11.1 DAC table; dynamic VID compensation via DVC pin

Pinout & Package

ISL6333AIRZ-T is housed in a 48-lead, 7 mm × 7 mm, 0.5 mm pitch QFN package (Pb-free, RoHS compliant) with exposed thermal pad. Pin functions are validated per FN6520 Rev 3.00 datasheet Figure 3 (ISL6333A top view).

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
UGATE1/2/3, LGATE1/2/3, BOOT1/2/3, PHASE1/2/3	Integrated gate drive outputs	Direct drive of high-side and low-side MOSFETs; bootstrapped high-side drive; phase node feedback for shoot-through protection
VSEN / RGND / VDIFF	Differential remote voltage sense interface	Compensates PCB IR drop by measuring load-side voltage; VDIFF = VSEN − RGND feeds error amplifier
IMON / PSI# / VID0–VID7 / VR_RDY	System interface signals	IMON provides analog load-current monitor; PSI# enables single-phase light-load mode; VID selects VR11 DAC output; VR_RDY indicates regulation status
RSET / OFS / APA / DVC / SS / FS	Configuration and compensation pins	RSET sets internal current-sense gain; OFS programs ± offset; APA configures phase alignment threshold; DVC smooths dynamic VID; SS controls soft-start slope; FS selects frequency and inductor mode

Key Features

Feature	Design Value
Intel VR11.1 Compliance	Full support including IMON current reporting, PSI#-driven phase dropping, and 8-bit VID decoding aligned to VR11 DAC table
Active Pulse Positioning (APP)	Reduces initial transient response time by dynamically repositioning PWM pulses during high di/dt load steps, lowering bulk capacitor count
Adaptive Phase Alignment (APA)	Aligns phase edges in real time to maximize effective switching frequency during transients, improving regulation bandwidth
Integrated Programmable Current Sense	Eliminates external R_SENSE components; R_SET-based gain tuning enables accurate DCR sensing across process/voltage/temperature
Differential Remote Sensing	Rejects PCB trace resistance errors via VSEN/RGND differential pair; VDIFF output directly interfaces error amplifier for precision regulation
Light-Load Efficiency Enhancement	PSI#-activated single-phase operation with optimized gate drive sequencing; no diode emulation (unlike ISL6333/ISL6333B)

Applications

Server CPU VRM	Desktop Platform Power
Use Scenario: Core voltage regulation for dual-socket Xeon E5/E7 platforms requiring VR11.1 compliance and tight load-line control. IC Role / Device Role / Timing Role: Primary three-phase PWM controller managing 12 V input-to-1.0–1.3 V core output with dynamic VID updates and thermal-aware phase shedding. Use Value: Enables ±0.5% output accuracy and APP/APA-enhanced transient response, reducing required bulk capacitance by up to 30% versus legacy controllers.	Use Scenario: High-efficiency power delivery for Intel LGA1156/1155 desktop CPUs (e.g., Core i7-800 series) with Eaglelake chipset compatibility. IC Role / Device Role / Timing Role: VR11.1-compliant controller implementing PSI#-driven phase drop and differential remote sensing for stable V_CCIN regulation. Use Value: Delivers >90% efficiency at 10 A load and <1% voltage deviation during 20 A/µs load steps via integrated DCR sensing and APA modulation.
Workstation GPU Power	Embedded Computing Module
Use Scenario: Multi-phase core supply for professional GPUs (e.g., NVIDIA Quadro, AMD FirePro) where thermal headroom and transient stability are critical. IC Role / Device Role / Timing Role: Three-phase buck controller with programmable droop (IDROOP→FB) and dynamic VID compensation for adaptive graphics workload scaling. Use Value: Supports rapid VID transitions (<10 µs settling) and maintains <±5 mV regulation error under 15 A step loads using DVC network and APP timing.	Use Scenario: Compact, high-reliability CPU power solution in fanless industrial PCs or COM Express modules operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable VR11.1 controller with –40°C to +85°C rated QFN package, thermal shutdown (160°C), and robust overvoltage/undervoltage lockout. Use Value: Ensures uninterrupted operation across extended temperature range with validated 0.5% accuracy and fault-safe VR_RDY signaling.

Server CPU VRM

Desktop Platform Power

Use Scenario: Core voltage regulation for dual-socket Xeon E5/E7 platforms requiring VR11.1 compliance and tight load-line control.

IC Role / Device Role / Timing Role: Primary three-phase PWM controller managing 12 V input-to-1.0–1.3 V core output with dynamic VID updates and thermal-aware phase shedding.

Use Value: Enables ±0.5% output accuracy and APP/APA-enhanced transient response, reducing required bulk capacitance by up to 30% versus legacy controllers.

Use Scenario: High-efficiency power delivery for Intel LGA1156/1155 desktop CPUs (e.g., Core i7-800 series) with Eaglelake chipset compatibility.

IC Role / Device Role / Timing Role: VR11.1-compliant controller implementing PSI#-driven phase drop and differential remote sensing for stable V_CCIN regulation.

Use Value: Delivers >90% efficiency at 10 A load and <1% voltage deviation during 20 A/µs load steps via integrated DCR sensing and APA modulation.

Workstation GPU Power

Embedded Computing Module

Use Scenario: Multi-phase core supply for professional GPUs (e.g., NVIDIA Quadro, AMD FirePro) where thermal headroom and transient stability are critical.

IC Role / Device Role / Timing Role: Three-phase buck controller with programmable droop (IDROOP→FB) and dynamic VID compensation for adaptive graphics workload scaling.

Use Value: Supports rapid VID transitions (<10 µs settling) and maintains <±5 mV regulation error under 15 A step loads using DVC network and APP timing.

Use Scenario: Compact, high-reliability CPU power solution in fanless industrial PCs or COM Express modules operating from –40°C to +85°C.

IC Role / Device Role / Timing Role: Temperature-stable VR11.1 controller with –40°C to +85°C rated QFN package, thermal shutdown (160°C), and robust overvoltage/undervoltage lockout.

Use Value: Ensures uninterrupted operation across extended temperature range with validated 0.5% accuracy and fault-safe VR_RDY signaling.

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-T	Same architecture but rated for 0°C to +70°C ambient; lacks extended temperature qualification	Suitable only for commercial-grade systems without industrial thermal requirements	Select ISL6333AIRZ-T when operation beyond 70°C ambient is required; both share identical pinout and firmware compatibility
ISL6333BIRZ-T	Includes CPURST_N pin for Eaglelake chipset integration; enables automatic PSI# coordination without external logic	Required for legacy Intel Eaglelake platform designs; adds one dedicated control pin not present on ISL6333A	Choose ISL6333AIRZ-T for general VR11.1 applications without Eaglelake-specific reset coordination needs

Compared with ISL6333IRZ-T, the ISL6333AIRZ-T extends operational reliability to industrial temperatures while retaining full functional equivalence; versus ISL6333BIRZ-T, it omits CPURST_N but simplifies layout and reduces BOM count where Eaglelake compatibility is unnecessary.

Availability

ISL6333AIRZ-T is available at Aetrix Electronics and suitable for server CPU VRMs, desktop platform power supplies, and embedded computing modules requiring stable component supply, long-term lifecycle support, and industrial-temperature-rated performance.

Supply support for ISL6333AIRZ-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 Corporation acquired Intersil in 2017 and continues to manufacture and support its high-performance analog and power management IC portfolio.

The ISL6333AIRZ-T belongs to Renesas' VR11.x multi-phase controller product line, engineered specifically for precision, high-efficiency core voltage regulation in Intel-based computing platforms with emphasis on transient response, thermal robustness, and system-level integration.

FAQ

What is the operating temperature range of the ISL6333AIRZ-T?

The ISL6333AIRZ-T is specified for operation from –40°C to +85°C ambient temperature, making it suitable for industrial and extended-temperature computing applications. This rating is confirmed in the FN6520 datasheet Table "Recommended Operating Conditions" and distinguishes it from the commercial-grade ISL6333CRZ/ISL6333IRZ variants. The ISL6333AIRZ-T maintains ±0.5% system accuracy across this full range.

Does the ISL6333AIRZ-T support diode emulation mode?

No, the ISL6333AIRZ-T does not support diode emulation mode. Per the FN6520 datasheet "Controller Descriptions and Comments" table, diode emulation is exclusive to ISL6333 and ISL6333B variants. The ISL6333AIRZ-T uses PSI#-driven phase dropping only - transitioning from three-phase to single-phase operation under light load - without discontinuous conduction mode or body-diode conduction emulation.

How is current sensing implemented on the ISL6333AIRZ-T?

The ISL6333AIRZ-T implements fully differential, continuous DCR current sensing across all three phases using dedicated ISEN+ and ISEN− pins per channel. It eliminates external current-sense resistors by integrating programmable current-sense elements; their effective value is set via an external resistor on the RSET pin. This architecture enables precise channel current balancing, load-line programming, and overcurrent protection without added board area or power loss.

What is the function of the APA pin on the ISL6333AIRZ-T?

The APA (Adaptive Phase Alignment) pin on the ISL6333AIRZ-T sinks a precise 100 µA current and is used to configure the trip threshold for the Adaptive Phase Alignment circuitry. By connecting an external resistor from APA to the COMP pin, designers set the voltage threshold at which phase edges are dynamically realigned to improve transient response. This feature is unique to the ISL6333 family and enhances regulation bandwidth during high di/dt load steps.

Can the ISL6333AIRZ-T be used with coupled inductors?

Yes, the ISL6333AIRZ-T supports coupled inductor operation. The FS pin determines the mode: tying the FS resistor to VCC configures the controller for coupled inductor topology, while grounding it selects standard (uncoupled) inductor operation. This flexibility allows designers to optimize ripple current cancellation and reduce output capacitance - a key advantage in space-constrained VRM designs.

ISL6333AIRZ-T Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 48-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

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-T FAQ

1.How can I place an order for ISL6333AIRZ-T through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL6333AIRZ-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 ISL6333AIRZ-T reliable?

The price and inventory of ISL6333AIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6333AIRZ-T is usually 5 days.

3.What payment methods are accepted for ISL6333AIRZ-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6333AIRZ-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ISL6333AIRZ-T?

ISL6333AIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ISL6333AIRZ-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 ISL6333AIRZ-T?

For technical support, including ISL6333AIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6333AIRZ-T requirements.

6.How does Aetrix verify that ISL6333AIRZ-T is sourced from the original manufacturer or authorized distributors?

All ISL6333AIRZ-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 ISL6333AIRZ-T meets industry standards.

7.What is the process for return or replacement of ISL6333AIRZ-T?

All ISL6333AIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6333AIRZ-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 ISL6333AIRZ-T part is unused and in its original packaging.

Return procedure for ISL6333AIRZ-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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