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Renesas ISL6328AIRZ-T
- Part No.:
- ISL6328AIRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ISL6328AIRZ-T.pdf
- Description:
- IC REG CTRLR AMD SVI 2OUT 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,819
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Product details
Overview
ISL6328AIRZ-T from Renesas Electronics is a dual-output, multiphase PWM controller designed for AMD SVI split-plane processors-delivering ±0.6% system voltage accuracy over temperature, 0.15–1.5 MHz selectable switching frequency, and integrated gate drivers for up to four-phase core (VDD) and single-phase northbridge (VDDNB) regulation in server/desktop CPU power delivery.
For engineers reviewing the ISL6328AIRZ-T datasheet, ISL6328AIRZ-T pinout, ISL6328AIRZ-T application, or ISL6328AIRZ-T equivalent, this page provides verified technical context on SVI interface timing, droop-controlled load-line regulation, differential DCR current sensing, adaptive phase alignment (APA), and PSI_L-driven phase shedding-key selection criteria for high-efficiency, transient-responsive VR designs.
Technical Context
The ISL6328AIRZ-T implements two independent control loops: a 1–4-phase multiphase controller for AMD processor core voltage (VDD) with fully differential continuous DCR current sensing, APA, and dual-edge modulation; and a dedicated single-phase PWM controller with integrated driver for northbridge voltage (VDDNB). Both loops support serial VID (SVI) interface operation up to 3.4 MHz and temperature-compensated droop regulation.
It features adaptive shoot-through protection on all gate drive outputs (UGATE/LGATE/UGATE_NB/LGATE_NB), programmable switching frequency via FS pin resistor, and precision remote sensing using VSEN/VSEN_NB and RGND pins. The GVOT pin enables gate voltage optimization during PSI_L mode, while DRPCTRL selects independent droop enable states for core and northbridge rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Output Configuration | 1–4-phase synchronous buck with internal drivers (1–2 phases) or external PWM drivers (3–4 phases) |
| Northbridge Output | Single-phase synchronous buck with integrated gate driver |
| System Voltage Accuracy | ±0.6% over 0°C to +70°C for VDAC > 1.000 V-enables tight core rail tolerance in high-performance CPUs |
| Switching Frequency Range | 0.15 MHz to 1.5 MHz-adjustable via FS pin resistor; supports optimized efficiency vs. size trade-offs |
| SVI Interface Speed | Up to 3.4 MHz clock rate-meets AMD processor dynamic VID update requirements |
| Droop Current Tolerance | Core: 67–85 µA (4-phase); NB: 67–83 µA-defines load-line slope accuracy for bulk capacitor reduction |
| Gate Drive Strength | Upper drive: 2.5 Ω source / 2.0 Ω sink; lower drive: 1.6 Ω source / 1.1 Ω sink-supports fast MOSFET switching with low losses |
Pinout & Package
ISL6328AIRZ-T is housed in a RoHS-compliant 48-lead 6×6 mm QFN package with exposed thermal pad (PKG DWG L48.6x6B), supporting high-power density and efficient heat dissipation in compact VR layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE1, UGATE2 | Core upper MOSFET gate drive outputs | Provide PWM-controlled high-side gate signals with adaptive shoot-through protection and bootstrap bias monitoring |
| LGATE1, LGATE2 | Core lower MOSFET gate drive outputs | Deliver synchronized low-side drive with turn-off detection for precise dead-time control |
| UGATE_NB, LGATE_NB | Northbridge upper/lower gate drive outputs | Independent single-phase drive with dedicated sensing and protection logic |
| VSEN, VSEN_NB | Core/NB remote sense inputs (+) | Connect to processor VDD_SENSE/VDDNB_SENSE pins for precision differential feedback |
| RGND | Remote ground sense input | Reference point for both core and NB differential amplifiers-must tie to VSS_SENSE |
| SVC, SVD | SVI clock and bidirectional data | Interface directly with AMD CPU for dynamic VID updates and power-state coordination |
| PSI_L (via EN pin) | Power Savings Mode enable input | Triggers phase shedding and diode emulation when asserted-improves light-load efficiency |
| DRPCTRL | Droop control configuration | Resistor-programmable selection of core/NB droop ON/OFF states and PSI phase count (1 or 2 active) |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Phase Alignment (APA) | Programmable threshold via APA pin RC network-reduces phase-to-phase timing skew for optimal current sharing |
| Fully Differential DCR Sensing | Continuous, temperature-compensated current measurement across ISENn+/ISENn− pairs-enables accurate load-line programming and channel balancing |
| Two-Level Overcurrent Protection | Instant (IDD_SPIKE) and delayed OCP modes-allows high-current transients without false triggering while ensuring long-term safety |
| Simultaneous Digital Soft-Start | Coordinated ramp-up of both core and NB outputs-prevents sequencing conflicts and inrush stress |
| Advanced Deadtime Control | Patent-pending zero shoot-through algorithm-minimizes cross-conduction losses without compromising switching speed |
Applications
| Server CPU Power Delivery | Desktop AMD Platform VRM |
|---|---|
Use Scenario: High-current, multi-core AMD EPYC or Ryzen processors requiring split-plane VDD/VDDNB regulation with dynamic VID updates. IC Role / Device Role / Timing Role: Dual-output multiphase PWM controller managing core voltage (up to 4-phase) and northbridge voltage (1-phase) under SVI protocol. Use Value: Enables ±0.6% voltage accuracy and fast transient response (<100 ns gate nonoverlap) critical for stable operation at >100 A core loads. |
Use Scenario: ATX motherboard VRMs powering AMD AM4/AM5 CPUs with strict thermal and space constraints. IC Role / Device Role / Timing Role: Integrated gate driver + controller reducing external component count and layout complexity for dual-rail CPU power. Use Value: Eliminates need for discrete gate drivers and external current-sense amplifiers-saves >12 components per phase versus discrete solutions. |
| Laptop CPU Voltage Regulator | Workstation GPU Companion VRM |
Use Scenario: Thin-and-light notebooks using AMD mobile APUs where light-load efficiency and thermal headroom are critical. IC Role / Device Role / Timing Role: PSI_L-enabled phase-shedding controller that drops from 2-phase to 1-phase operation during idle states. Use Value: Achieves >90% efficiency at 5 A load via diode emulation and gate voltage optimization-extends battery runtime. |
Use Scenario: High-end workstation motherboards supplying auxiliary power to AMD Radeon Pro GPUs alongside CPU VRM. IC Role / Device Role / Timing Role: Secondary VRM controller delivering tightly regulated VDDNB-equivalent rail for GPU memory controller or I/O die. Use Value: Leverages same SVI interface and droop programming as CPU core rail-simplifies firmware integration and board-level calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multiphase PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IR35201MTRPBF | Supports Intel VR12/VR12.5 protocols only; no native SVI interface; requires external level shifters for AMD compatibility | Designed for Intel platforms; lacks DRPCTRL and PSI_L implementation for AMD-specific power states | Use only if migrating from Intel-based design or adding AMD support via custom SVI translation logic |
| TPS53679RSLR | Single-chip 6-phase controller with PMBus interface; no integrated NB regulator; requires external single-phase controller for split-plane operation | Targets high-phase-count core rails only; northbridge must be implemented separately-increasing BOM and layout complexity | Select when >4-phase core regulation is required and NB rail can be sourced from discrete solution or companion IC |
Compared with IR35201MTRPBF and TPS53679RSLR, the ISL6328AIRZ-T uniquely integrates both AMD-optimized SVI interface and dedicated northbridge regulation in one package-reducing component count, eliminating inter-IC timing skew, and enabling direct PSI_L coordination between core and NB domains without firmware mediation.
Availability
ISL6328AIRZ-T is available at Aetrix Electronics and suitable for server motherboard development, desktop VRM production, and embedded AMD platform design requiring stable component supply, full RoHS compliance, and long-term lifecycle support.
Supply support for ISL6328AIRZ-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 is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for automotive, industrial, and computing markets.
The ISL6328A belongs to Renesas' high-performance digital power controller product line, engineered specifically for AMD processor power delivery-including SVI protocol compliance, split-plane regulation, and advanced transient response features required by modern x86 platforms.
FAQ
What is the operating temperature range for the ISL6328AIRZ-T?
The ISL6328AIRZ-T is rated for commercial operation from 0°C to +70°C ambient temperature. Its thermal resistance (θJA = 27°C/W) and integrated thermal pad enable reliable performance in densely packed VRM layouts when mounted on PCBs with adequate copper pour and thermal vias. The device incorporates internal thermal shutdown protection to prevent damage under sustained overload conditions.
Does the ISL6328AIRZ-T support both 3-phase and 4-phase core configurations?
Yes, the ISL6328AIRZ-T supports 1-, 2-, 3-, or 4-phase operation for the core voltage rail. Phases 1 and 2 use internal gate drivers; phases 3 and 4 require external PWM drivers connected to PWM3/PWM4 pins. Channel disable is achieved by pulling ISEN3−/ISEN4− high to +5V in decremental order, as specified in the datasheet's functional pin descriptions.
How does the DRPCTRL pin configure droop behavior on the ISL6328AIRZ-T?
The DRPCTRL pin on the ISL6328AIRZ-T sets droop enable states for both core and northbridge rails via an external resistor to GND or VCC. Four combinations are supported: Core On/NB On; Core Off/NB On; Core On/NB Off; Core Off/NB Off. Resistor value also determines active phase count in PSI_L mode-ground tie yields 1-phase, VCC tie yields 2-phase operation.
Can the ISL6328AIRZ-T operate without a serial VID interface?
No-the ISL6328AIRZ-T requires the AMD Serial VID (SVI) interface for core voltage programming and power-state coordination. It lacks metal-VID or resistor-programmed startup voltage capability. The SVC and SVD pins must be connected to the host AMD processor; absence of SVI communication prevents proper initialization and results in no valid output voltage regulation.
What is the purpose of the FB_PSI pin on the ISL6328AIRZ-T?
The FB_PSI pin on the ISL6328AIRZ-T is internally shorted to the FB pin during PSI_L mode to augment the feedback compensation network for reduced phase count operation. This maintains loop stability and transient response when transitioning from full-phase to shedded-phase states-ensuring seamless efficiency improvement without output voltage disturbance or control loop instability.
ISL6328AIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for ISL6328AIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6328AIRZ-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 ISL6328AIRZ-T reliable?
The price and inventory of ISL6328AIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6328AIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6328AIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6328AIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6328AIRZ-T?
ISL6328AIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6328AIRZ-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 ISL6328AIRZ-T?
For technical support, including ISL6328AIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6328AIRZ-T requirements.
6.How does Aetrix verify that ISL6328AIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6328AIRZ-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 ISL6328AIRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6328AIRZ-T?
All ISL6328AIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6328AIRZ-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 ISL6328AIRZ-T part is unused and in its original packaging.
Return procedure for ISL6328AIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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