Integrated GaN power stage solutions with protection and sensing functions
There are numerous integrated GaN power stage solutions featuring protection and sensing functions. Below, two examples related to GaN driving are introduced: the STMicroelectronics STDRIVEG611 and the Infineon CoolGaN™ Drive.
The STDRIVEG611 introduced by ST is a high-voltage, high-speed half-bridge gate driver (a dedicated driver IC) designed specifically for N-channel enhancement-mode GaN FETs (e-mode GaN), suitable for high-frequency, high-dv/dt power electronic systems. The core functions of the STDRIVEG611 include half-bridge high-voltage drive capability, supporting high-side and low-side driving with power rail voltages up to 600V, and it includes an integrated high-voltage bootstrap diode to simplify the power supply architecture. Additionally, it features high-performance drive characteristics, with high transient dv/dt immunity (±200 V/ns) to support high-speed switching GaN. It offers split source/sink drive paths with high output current (2.4 A sink / 1.0 A source), extremely short propagation delay (approximately 45 ns), and supports frequencies greater than 1 MHz.
The system protection and logic interface of the STDRIVEG611 support a built-in overcurrent comparator with smart shutdown functionality, UVLO protection with separate monitoring for the high-voltage section and logic section, a fault pin for outputting overcurrent/overtemperature/UVLO error signals, the ability to enter standby mode to reduce power consumption, and support for 3.3 V – 20 V control logic. The STDRIVEG611 is suitable for motor control (industrial, home appliances, servo drives, etc.), as well as high-frequency power systems like DC/DC converters, PFC circuits, power converters, chargers, and adapters. The STDRIVEG611 emphasizes high-voltage, high-speed half-bridge driving with fundamental protection functions, providing a precise and safe switching control interface for GaN FETs, but it does not integrate the power device itself; it is a dedicated driver IC.
Infineon CoolGaN™ Drive is an integrated driver plus power stage solution, part of Infineon’s GaN series. These products integrate GaN power transistors and gate driver chips into a single package, available for single switches or half-bridge topologies. At the same time, it features built-in protection, adjustable switching characteristics, and sensing capabilities, designed to simplify the design of high-efficiency power supplies and motor drives.
Infineon CoolGaN™ Drive
The core functions of the Infineon CoolGaN™ Drive include power stage and driver integration, integrating the GaN switching device and driver in a single package (power stage), providing half-bridge structure/single switch options, directly connecting to controller PWM signals, and supporting level-shift gate drivers and bootstrap diodes. Furthermore, the CoolGaN™ Drive supports high-efficiency switching control, with support for adjustable dv/dt control to aid EMI management and ringing suppression, making it suitable for high-frequency switching (greater than 200 kHz) and high-efficiency topology design.
The CoolGaN™ Drive supports integrated protection and sensing, incorporating standard protection measures including overcurrent protection (OCP), overtemperature protection (OTP), and short-circuit protection (SCP). Certain models also feature lossless current sense, with protection and sensing functions integrating directly with the controller interface, enhancing system reliability.
The CoolGaN™ Drive also offers BoM reduction and system simplification benefits. By integrating the driver and protection, it significantly reduces the number of external components and PCB complexity, making it ideal for high-density power supplies, adapters, on-board chargers, and motor control applications. It is suitable for power converters (AC/DC, DC/DC, PFC, LLC, etc.), power tools and home appliances, data center power supplies, electric vehicles, and energy systems requiring high efficiency. Compared to a standalone driver IC, the CoolGaN™ Drive is an integrated power stage solution containing the power device, driver, protection, and sensing features, representing a more system-level power module.
Overall, the ST STDRIVEG611 provides a high-voltage, high-frequency, and robustly protected GaN driver interface, serving as a powerful driving device for high-efficiency GaN power supplies and motor control. The Infineon CoolGaN™ Drive further integrates the driver with the power device, adding protection and sensing to become a system-level power solution, best suited for power supplies and conversion systems pursuing higher power density, design simplification, and rapid validation.
| Solution | Technical Core | Driver & Power Stage Integration | Voltage Range | Main Applications |
| CoolGaN™ Drive | Lateral GaN + Integrated Driver | Yes | 600–700 V | Medium/High Voltage Power Supplies, Industrial |
| onsemi Vertical GaN | Vertical GaN Substrate Arch. | No | 1200V and above | High-Power Data Centers / EVs / Energy Systems |
| TI LMGxx GaN Power Stage | Integrated GaN FET + Driver + Protection | Yes | ~600–700 V | High-Frequency Power Supplies, AC/DC, DC/DC |
Conclusion
The development of integrated GaN gate driver power stages marks a critical turning point in power electronics technology, moving from “high-speed device application” towards “system-level optimization platforms”. When GaN’s high-speed switching capability, low parasitic capacitance, and zero reverse recovery characteristics are combined with built-in gate drivers, precise delay matching, and multi-layered protection mechanisms, the power stage is no longer just a simple switching device, but a highly integrated power conversion core module. By shortening gate loops, optimizing package parasitics, enhancing CMTI tolerance, and incorporating intelligent sensing and self-protection functions, integrated GaN power stages effectively address the challenges of EMI, thermal management, and reliability under high-frequency operation, while significantly lowering the system design barrier.
From 600 – 650V high-voltage applications to higher-frequency soft-switching topologies, and from unidirectional half-bridges to bidirectional energy flow architectures, integrated GaN power stages are progressively building a clear technological evolution path: based on material advantages, centered on driver integration, and aimed at system optimization. In the future, with the maturation of bidirectional GaN switches, digital control integration, and higher voltage platforms, integrated GaN will not only improve power density and efficiency but will also redefine the architectural thinking and design methodology of power conversion systems, becoming a key pillar of next-generation high-efficiency energy conversion technology.
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