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Renesas ISL6328AIRZ
- Part No.:
- ISL6328AIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6328AIRZ.pdf
- Description:
- IC REG CTRLR AMD SVI 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
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Product details
Overview
ISL6328AIRZ from Renesas Electronics (formerly Intersil) is a dual-output, multiphase PWM controller IC designed specifically for AMD SVI-split-plane processors. It delivers precision core voltage (VDD) regulation via up to 4-phase synchronous buck conversion and independent Northbridge (VDDNB) regulation via single-phase buck control. Key confirmed parameters include ±0.6% system accuracy over temperature, selectable switching frequency up to 1 MHz, fully differential DCR current sensing, and integrated gate drivers for both core and NB sections. It is deployed in high-performance desktop and server CPU power delivery systems.
For engineers reviewing the ISL6328AIRZ datasheet, ISL6328AIRZ pinout, ISL6328AIRZ application, or ISL6328AIRZ equivalent, this page provides verified technical context, validated pin functions, real-world application mappings for AMD processor platforms, and two confirmed alternative controllers with documented functional and implementation differences.
Technical Context
The ISL6328AIRZ implements a hybrid architecture: a 1–4-phase multiphase controller for VDD with adaptive phase alignment (APA), active pulse positioning modulation, and dual-edge modulation for fast di/dt transient response; plus a dedicated single-phase controller for VDDNB with independent error amplifier (COMP_NB), remote sensing (VSEN_NB/FB_NB), and droop programming. Both sections share SVI serial interface compliance (up to 3.4 MHz) and PSI_L–enabled phase shedding.
Core regulation uses continuous, temperature-compensated DCR current sensing across four channels (ISEN1± to ISEN4±) for precise load-line droop and channel-current balancing; Northbridge regulation employs separate ISEN_NB± sensing. Gate drive includes integrated high- and low-side drivers (UGATE1/LGATE1 through UGATE_NB/LGATE_NB), adaptive shoot-through protection, and GVOT voltage optimization during PSI mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual output: 1–4-phase VDD + 1-phase VDDNB, each with independent feedback and sensing |
| System Accuracy | ±0.6% over 0°C to +70°C for VDD > 1.000 V - enables tight VID tracking for AMD processors |
| Switching Frequency | Selectable up to 1 MHz via FS pin resistor - supports high-efficiency, compact filter design |
| Current Sensing | Fully differential, continuous DCR sensing with TCOMP1/TCOMP2 temperature compensation - ensures stable load-line and channel balance across thermal range |
| SVI Interface | Compliant with AMD Serial VID protocol up to 3.4 MHz clock - enables dynamic voltage scaling and processor communication |
| Protection Features | Two-level OCP (instant/delayed), multitiered OVP, UVLO, open-sense-line detection, and adaptive shoot-through prevention - meets AMD platform reliability requirements |
| Driver Integration | Integrated high- and low-side MOSFET drivers for all phases (core + NB) - reduces external component count and layout complexity |
Pinout & Package
ISL6328AIRZ is housed in a 48-lead, 6 mm × 6 mm QFN package with exposed thermal pad (RoHS-compliant, L48.6x6B drawing). The package supports high-power dissipation (θJA = 27°C/W) and requires PCB thermal vias under the pad for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE1, UGATE2, UGATE_NB | Upper MOSFET gate drive outputs | Provide PWM-controlled high-side gate signals with adaptive shoot-through protection and bootstrap bias monitoring |
| LGATE1, LGATE2, LGATE_NB | Lower MOSFET gate drive outputs | Deliver synchronized low-side drive with turn-off detection for precise dead-time control |
| ISEN1± to ISEN4±, ISEN_NB± | Differential current sense inputs | Enable accurate, temperature-compensated DCR-based current measurement per phase for droop, balancing, and OCP |
| VSEN, FB, COMP / VSEN_NB, FB_NB, COMP_NB | Core & NB remote-sense and feedback nodes | Support Kelvin-connected differential sensing for ±0.6% regulation accuracy under load and thermal variation |
| SVC, SVD | AMD Serial VID interface | Bi-directional clock/data lines for dynamic VID updates and processor status exchange at up to 3.4 MHz |
| PSI_L support (via DRPCTRL, FB_PSI, EN) | Power Savings Mode control | Enables automatic phase shedding, diode emulation, and gate voltage optimization below light-load thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Phase Alignment (APA) | Automatically adjusts phase timing to minimize input/output ripple and improve transient response without manual tuning |
| Dual-edge modulation | Reduces initial response latency to high-di/dt load steps - critical for modern CPU burst current demands |
| Temperature-compensated DCR sensing | Maintains consistent load-line droop and channel balance across 0°C–70°C ambient - eliminates need for NTC thermistors |
| Integrated GVOT LDO | Optimizes upper gate drive voltage during PSI mode to reduce switching losses while preserving robustness |
| Simultaneous digital soft-start | Coordinates ramp-up of both VDD and VDDNB outputs to prevent sequencing violations and inrush stress |
Applications
| Desktop CPU Power Delivery | Server Processor VRM |
|---|---|
Use Scenario: High-performance x86 desktop motherboard powering AMD Phenom II or FX-series CPUs with split-plane VDD/VDDNB rails. IC Role / Device Role / Timing Role: Primary dual-rail PWM controller managing 4-phase core and 1-phase Northbridge regulation via SVI interface. Use Value: Enables ±0.6% VDD accuracy and fast transient response required for stable overclocking and dynamic frequency scaling. |
Use Scenario: Dual-CPU server board supporting AMD Opteron processors with strict power sequencing and thermal management. IC Role / Device Role / Timing Role: Central VRM controller delivering coordinated soft-start, PSI_L–driven efficiency optimization, and fault reporting across redundant power stages. Use Value: Reduces bulk capacitor count via load-line droop and improves light-load efficiency by up to 15% through phase shedding. |
| Workstation Graphics Platform | Embedded Computing Module |
Use Scenario: High-end workstation motherboard integrating discrete GPU and CPU on shared 12V input with tight EMI constraints. IC Role / Device Role / Timing Role: Multiphase controller providing interleaved VDD switching (3×120° phase shift) to suppress input ripple and simplify EMI filtering. Use Value: Achieves 3× higher effective ripple frequency vs. single-phase - cuts input capacitance requirement by ~50%. |
Use Scenario: Compact embedded computing module (e.g., COM Express Type 6) requiring minimal BOM count and thermal footprint. IC Role / Device Role / Timing Role: Monolithic dual-controller replacing discrete core/NB controllers and external drivers - saves ≥12 passives and 2 ICs. Use Value: Reduces PCB area by 35% and simplifies layout with integrated drivers and unified SVI interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multiphase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35201MTRPBF | 8-phase capable, supports Intel VR12.5/VR13, no integrated NB controller - requires external single-phase IC for VDDNB | Targeted at Intel platforms; lacks native AMD SVI support and integrated Northbridge regulation | Choose when designing for Intel CPUs or requiring >4-phase core scalability |
| TPS53679RSLR | 6-phase, supports PMBus 1.3, integrated telemetry, no SVI interface - uses SMBus-based VID instead of AMD-specific protocol | Designed for generic server VRMs with digital monitoring; incompatible with AMD SVI handshake and metal VID fallback | Prefer for designs needing real-time telemetry, PMBus configuration, or non-AMD ecosystems |
Compared with IR35201MTRPBF and TPS53679RSLR, the ISL6328AIRZ uniquely integrates both AMD-optimized SVI communication and a dedicated Northbridge regulator in one die - eliminating inter-IC timing skew, reducing component count, and ensuring native compatibility with AMD's split-plane power architecture.
Availability
ISL6328AIRZ is available at Aetrix Electronics and suitable for desktop CPU VRMs, server motherboard power delivery, and embedded computing modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6328AIRZ 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 maintains full product support, documentation, and manufacturing continuity for the ISL6328A family.
The ISL6328A belongs to Renesas' high-performance analog power management portfolio, engineered specifically for AMD processor platforms requiring split-rail, SVI-compatible, multiphase CPU voltage regulation with integrated drivers and precision droop control.
FAQ
What is the operating temperature range for the ISL6328AIRZ?
The ISL6328AIRZ is specified for commercial operation from 0°C to +70°C ambient temperature. Its thermal resistance (θJA = 27°C/W) and internal thermal protection features ensure reliable performance within this range when mounted on a properly designed PCB with thermal vias under the exposed pad. The ISL6328AIRZ datasheet confirms these limits in the Recommended Operating Conditions table on page 9.
Does the ISL6328AIRZ support AMD's Serial VID (SVI) interface?
Yes, the ISL6328AIRZ natively supports AMD's Serial VID (SVI) interface via dedicated SVC and SVD pins, with full compliance up to 3.4 MHz clock rates. It handles both dynamic VID updates and pre-PWROK "metal VID" fallback modes, as documented in Sections 15–17 of the FN7986 datasheet. This makes the ISL6328AIRZ a direct fit for AMD Phenom II, FX, and early Opteron platforms requiring SVI protocol support.
How does the ISL6328AIRZ implement phase shedding in Power Savings Mode?
The ISL6328AIRZ implements phase shedding via the PSI_L signal and DRPCTRL pin configuration. When PSI_L is asserted, the controller reduces active phases based on DRPCTRL resistor selection (1- or 2-phase operation), enables diode emulation in low-side FETs, and activates the GVOT LDO for optimized gate drive voltage. This behavior is detailed in Section 17 ("Power Savings Mode: PSI_L") of the FN7986 datasheet and verified in the Electrical Specifications table on page 10.
What current sensing method does the ISL6328AIRZ use for load-line regulation?
The ISL6328AIRZ uses fully differential, continuous DCR current sensing across all core phases (ISEN1± to ISEN4±) and the Northbridge channel (ISEN_NB±), with temperature compensation via TCOMP1 and TCOMP2 pins. This method enables accurate load-line (droop) programming and channel-current balancing without discrete current-sense resistors, as confirmed in Sections 14 and 23 of the FN7986 datasheet and the Electrical Specifications table on page 10.
Is the ISL6328AIRZ pin-compatible with other members of the ISL6328 family?
Yes, the ISL6328AIRZ shares identical pinout and package (48-lead QFN) with the ISL6328ACRZ and ISL6328AIRZ-T, as confirmed in the Ordering Information table (page 8) and Pin Configuration diagram (page 6) of the FN7986 datasheet. All variants use the same L48.6x6B package drawing and functional pin mapping - enabling drop-in replacement across temperature grades and reel formats.
ISL6328AIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, AMD SVI
- Voltage - Input:
- 5V ~ 12V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.0125V ~ 1.55V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (6x6)
ISL6328AIRZ FAQ
1.How can I place an order for ISL6328AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6328AIRZ 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 ISL6328AIRZ reliable?
The price and inventory of ISL6328AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6328AIRZ is usually 5 days.
3.What payment methods are accepted for ISL6328AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6328AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6328AIRZ?
ISL6328AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6328AIRZ 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 ISL6328AIRZ?
For technical support, including ISL6328AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6328AIRZ requirements.
6.How does Aetrix verify that ISL6328AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6328AIRZ 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 ISL6328AIRZ meets industry standards.
7.What is the process for return or replacement of ISL6328AIRZ?
All ISL6328AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6328AIRZ, 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 ISL6328AIRZ part is unused and in its original packaging.
Return procedure for ISL6328AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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