company blog about Recycle ST GaN Power Product:GaN Driver,GaN Converter,Integrated Smart GaN

Recycle ST GaN Power Product:GaN Driver,GaN Converter,Integrated Smart GaN

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I. ST GaN-Specific Drivers: Dedicated Drive Cores for High-Frequency, High-Efficiency GaN Devices

Traditional silicon-based drivers are unable to accommodate the operating characteristics of GaN devices—which feature ultra-high switching frequencies, high dv/dt and low thresholds—and are prone to issues such as drive delay, crosstalk-induced false triggering and a sharp increase in power loss. ST’s GaN gate drivers, developed specifically for enhanced GaN HEMT devices, are the core supporting chips that ensure the stable, efficient and high-frequency operation of GaN power devices. They are designed for high-frequency resonant power supplies, half-bridge/full-bridge topologies and high-voltage power conversion applications.

1. Key Representative Models and Hardware Characteristics

The STDRIVEG600 and STDRIVEG611 are flagship products in the driver portfolio; they are 600V high-voltage half-bridge-specific GaN drivers, precisely matched to the operating requirements of mainstream 650V-class GaN power transistors. The products utilise a dedicated high-voltage process architecture, support synchronous drive of both the high-side and low-side transistors, and operate across a wide range of industrial-grade voltage conditions, making them ideally suited to voltage fluctuations in high-frequency power conversion systems.

The devices incorporate precise dead-time control and anti-crosstalk design, effectively suppressing voltage spikes and electromagnetic interference during high-frequency GaN switching, whilst completely eliminating the risk of cross-conduction between the upper and lower switches. Additionally, they feature an integrated bootstrap circuit, eliminating the need for an external bootstrap diode, which significantly simplifies the peripheral circuit layout and reduces the impact of PCB parasitic parameters on high-frequency operation.

2. Core Technical Advantages

Firstly, exceptional high-frequency compatibility: it overcomes the frequency limitations of silicon-based drivers, supporting ultra-high switching frequencies in the MHz range. This fully harnesses the high-frequency, low-loss advantages of GaN devices, enabling power supply equipment to significantly reduce the size of passive components such as transformers and capacitors; Secondly, comprehensive protection mechanisms, integrating high-side and low-side under-voltage lockout (UVLO), over-temperature protection and interlock anti-through-conduction functions, prevent damage to GaN devices under low-voltage, overheating or abnormal conduction conditions, thereby significantly enhancing system stability; Thirdly, high immunity to interference; the circuit design is optimised for the high dv/dt characteristics of the GaN switching process, effectively suppressing high-frequency crosstalk and ensuring suitability for demanding industrial and automotive electromagnetic environments.

3. Typical Application Scenarios

Widely used in LLC resonant converters, high-voltage LED driver power supplies, industrial switching power supplies, new energy auxiliary power supplies and automotive DC-DC conversion systems, these components serve as core driver components for discrete GaN power supply architectures, balancing design flexibility with system reliability.

II. ST GaN Monolithic Converter: An Integrated Power Conversion Solution with a Minimalist Architecture

Based on the core design philosophy of ‘single-chip integration’, ST’s GaN monolithic converters integrate GaN power transistors, gate drivers, resonant control circuits and protection circuits onto a single chip, eliminating the need for traditional multi-chip discrete power supply architectures. They represent a highly integrated, low-cost and high-efficiency power conversion solution for small-to-medium power applications, with the VIPerGaN series as the flagship product line.

1. Core Product Portfolio and Technical Specifications

The VIPerGaN series is ST’s flagship GaN converter product line, covering a wide power range. The new VIPerGaN100W and VIPerGaN100WB models increase the maximum power output to 100W, filling the gap in medium-to-high-power monolithic GaN converter solutions. The devices incorporate a 700V high-voltage GaN power switch, a dedicated gate driver and a quasi-resonant flyback controller, all integrated within an ultra-compact 5mm × 6mm QFN package, drastically reducing the overall size of the equipment.

The entire product range utilises normally-off enhanced-mode GaN technology, featuring low on-resistance and minimal switching losses. Compared to traditional silicon-based flyback converters, standby losses are significantly reduced and conversion efficiency is markedly improved, enabling the products to easily meet stringent standards such as Tier 6 energy efficiency and ultra-low energy consumption requirements for new energy vehicles.

2. Key Technical Highlights

Firstly, extreme integration simplifies design: a single chip provides full functionality for power conversion, drive, control and protection, substantially reducing the number of external components, lowering PCB layout complexity and material costs, and shortening product development cycles; Secondly, a quasi-resonant high-frequency operating mode utilises resonant soft-switching technology to eliminate switching losses, supporting high-frequency operation whilst suppressing electromagnetic interference and enhancing power supply stability; Thirdly, it offers broad operating condition adaptability, supporting a wide input voltage range to suit various scenarios such as domestic mains power and industrial low-voltage power supplies. It also integrates comprehensive protection against overvoltage, overcurrent, overheating and undervoltage, ensuring the long-term stable operation of equipment.

3. Typical Application Scenarios

Primarily suited to small- and medium-power consumer electronics adapters, chargers, smart home power supplies, industrial auxiliary power supplies, LED lighting drivers and similar applications, it has become the preferred solution for lightweight, high-efficiency power supplies thanks to its compact size, low standby power consumption and excellent cost-performance ratio.

III. ST Integrated Smart GaN (STi²GaN/MasterGaN): High-End System-Level Power SiP Solutions

Integrated Smart GaN represents the high-end core product line of ST’s GaN technology. Centred on System-in-Package (SiP) technology, it forms the STi²GaN smart power platform, with the MasterGaN series as its flagship product. This series completely overcomes the limitations of discrete and monolithic solutions by integrating a full suite of functions—including dual GaN power transistors, intelligent drivers, logic control, monitoring and protection, and bootstrap circuits—within a single package. It provides an intelligent power stage solution designed for medium-to-high power, high-frequency and high-reliability applications.

1. Key Representative Products and Hardware Architecture

The MasterGaN1 and MasterGaN6 are the mainstream core models. They utilise a standardised half-bridge topology, integrating two 650V enhancement-mode GaN transistors within a single package, paired with an embedded high-frequency intelligent gate driver and an integrated bootstrap diode, eliminating the need for external drivers and bootstrap components. The MasterGaN1 has an on-resistance of 150 mΩ and is suitable for 250W-class LLC converters; The MasterGaN6 utilises an ultra-compact 9×9 mm QFN package, offering further enhanced power density and is suitable for medium-to-high-power applications in the 350W class.

The products utilise a wire-bond-free QFN-DCI package, which significantly reduces parasitic inductance and resistance. Combined with a double-sided heat dissipation structure, thermal efficiency is greatly improved, thoroughly resolving thermal bottlenecks under high-frequency, high-power operating conditions and meeting the demands of continuous high-load operation.

2. Intelligent Core Functions and Technical Advantages

Firstly, intelligent anti-misoperation control: it features built-in independent UVLO under-voltage protection for the upper and lower switches, as well as a hardware interlock to prevent direct conduction. This eliminates the risk of short circuits caused by simultaneous conduction of the upper and lower switches at the hardware level, far surpassing the reliability of software-based protection in traditional discrete solutions. Secondly, comprehensive intelligent protection: it integrates multiple protection mechanisms including over-temperature, over-current, over-voltage and under-voltage protection, whilst also featuring a self-diagnostic function that monitors the operating status of the power stage in real time and rapidly shuts down protective components in the event of an anomaly; Thirdly, ultra-low parasitic high-frequency characteristics: the bond-wire-free packaging structure significantly reduces stray inductance, supporting ultra-high-frequency soft-switching operation. This substantially reduces switching losses and electromagnetic interference, whilst improving system efficiency by more than 4% compared to traditional silicon-based solutions; fourthly, wide compatibility and intelligent adaptation: the input pins support standard 3.3V logic levels, allowing direct interfacing with master control chips such as MCUs and DSPs, and compatibility with various digital power control systems.

3. Core Application Scenarios

Focusing on mid- to high-end, high-power, high-efficiency power supply applications, including on-board chargers for new energy vehicles, automotive DC-DC converters, industrial high-frequency inverter power supplies, high-power LLC resonant converters, high-end industrial LED drivers and server auxiliary power supplies, these solutions represent the preferred choice for high-reliability power conversion systems in industrial and automotive applications.

IV. Summary of the Differentiated Positioning and Selection of ST’s Three Major GaN Product Lines

ST’s three-tier GaN product system provides comprehensive coverage ranging from low-cost, general-purpose solutions to highly intelligent, high-end options, precisely matching the design requirements of different scenarios:

1. Dedicated GaN Drivers: Featuring high flexibility and adaptability, these are suitable for customised designs requiring independent selection of power transistors and flexible adjustment of power ratings. They are compatible with differentiated topological scenarios in industrial and automotive applications and serve as the core components for discrete-architecture GaN power supplies;

2. GaN Monolithic Converters: Featuring minimalist design and excellent value for money, these are aimed at standardised applications in the small-to-medium power range, maximising circuit simplification and cost reduction. They are suited to mass-production scenarios with urgent demand, such as consumer electronics and smart home applications;

3. Integrated Smart GaN: Featuring high power density, high reliability and intelligent functionality, these solutions are designed for high-end industrial and automotive applications requiring medium to high power, high stability and high-frequency operation. They utilise SiP integration to achieve systematic and intelligent power conversion.