As AI data centers, NEVs (New Energy Vehicles), and photovoltaic energy storage systems rapidly evolve toward high-voltage and high-power architectures, traditional 400V and 800V buses are progressively transitioning to 1200V and even 1500V. However, in the field of high-voltage main power conversion, engineers have long faced a dilemma where it is difficult to balance competing requirements.
If traditional high-voltage silicon carbide (SiC) solutions are adopted, although the devices have sufficient voltage withstand capability, their switching frequency is typically limited to below 250kHz due to material characteristics. This directly leads to the massive size of peripheral inductive components such as transformers and inductors, preventing further improvement in system power density.
Conversely, to leverage the high-frequency advantages of gallium nitride (GaN), the past approach could only use multiple low-voltage GaN devices stacked in series. This method not only makes the drive circuit extremely complex but also introduces the risk of uneven voltage distribution during turn-off. Coupled with the thermal management challenges caused by differences in on-resistance among multiple devices, the overall robustness of the system is significantly compromised.
Addressing this industry pain point, Power Integrations (PI) has introduced a completely new solution. Recently, PI officially launched the industry's first 2200V gallium nitride switching technology (PowiGaN™). This breakthrough signifies that GaN technology has entered the high-voltage main power market previously dominated by SiC for the first time, bringing engineers a more streamlined and safer single-stage power system solution.
How is the 2200V Voltage Rating Achieved?
Currently, there is almost a blank in the market for commercial GaN products above 900V, mainly because the "GaN-on-Silicon" technology adopted by most manufacturers faces physical bottlenecks.
Image source: Power Integrations
Jason Yan, Senior Technical Training Manager at PI, pointed out that silicon itself is a conductive material. Growing wafers on it makes it difficult to break through the high-voltage bottleneck in terms of production yield and voltage withstand limits. The core reason PI can push the voltage of lateral GaN to 2200V lies in the perfect combination of its proprietary GaN-on-Sapphire technology and Cascode structure.
Image source: Power Integrations
As a mature non-conductive insulator, sapphire has been widely used in the LED industry and can naturally provide robust insulation limits for PowiGaN. In lateral GaN devices, current flows between the Source and Drain on the left and right sides. The voltage withstand capability largely depends on the material and spacing. Laboratory tests show that the actual breakdown voltage of 2200V PowiGaN in the off-state exceeds 4kV, leaving an ultra-high margin of up to 2kV for 2200V rated systems.
Image source: Power Integrations
Addressing the industry's concern about the "poor thermal conductivity of sapphire," Jason Yan revealed that PI optimized the overall thermal resistance from the wafer to the package shell through its unique package design (such as the InSOP-28D package used for testing), compensating for material defects at the packaging level.
In terms of architecture design, since GaN devices (D-Mode depletion-type) are naturally normally-on, they pose an unacceptable safety hazard in power systems. PI cleverly adopted a Cascode architecture, connecting a high-voltage depletion-mode GaN HEMT in series with a low-voltage silicon MOSFET for control.
Image source: Power Integrations
Jason Yan believes this design can eliminate the negative voltage drive constraints of traditional enhancement-mode (E-Mode) GaN. The drive limit for traditional E-Mode GaN is only around 7V, and a negative voltage must be applied during turn-off to prevent noise-induced false turn-on and subsequent burnout. In contrast, PowiGaN relies on external low-voltage silicon MOSFET control, allowing the drive voltage to reach a mature 15V. It requires only positive voltage drive and has strong anti-false turn-on capabilities, significantly enhancing the safety protection and system reliability of the entire power device.
Third-Quadrant Operation: Dead-Time Losses Plummet by 86%
In common LLC resonant or half-bridge topologies for switching power supplies, to prevent shoot-through of the upper and lower switches, engineers must set a "dead time." During this period, current flows in reverse from the source to the drain, entering third-quadrant operation. This metric directly determines the efficiency ceiling of the entire power supply system.
Image source: Power Integrations
Jason Yan pointed out that PI's Cascode architecture demonstrates an overwhelming efficiency advantage here. During reverse conduction, the knee voltage (Vsd_knee) of traditional E-Mode GaN is as high as 5V. Calculated with a 1A dead-time current, the loss would reach 5W. However, during third-quadrant operation, the current in PowiGaN flows through the body diode of the low-voltage silicon MOSFET, which has a forward voltage drop of only 0.7V. Under the same current conditions, its loss is only 0.7W.
This means that during the critical dead time, PowiGaN reduces dead-time losses by nearly 86% compared to traditional E-Mode GaN. This low dead-time loss characteristic allows the device to maintain excellent thermal performance during high-speed, high-frequency switching, thereby boosting the overall conversion efficiency of the system.
2200V GaN and High-Voltage SiC: Not a Price War Game
The launch of this technology inevitably leads to speculation about whether PI intends to engage in a fierce price war with high-voltage SiC.
Jason Yan denied this, telling reporters from eefocus: "We are not introducing 2200V GaN as a cost-down replacement, but to bring about a massive improvement in performance."
He further explained that compared to SiC solutions, the output capacitance (Coss) and gate charge (Qg) of 2200V PowiGaN are significantly reduced, which directly lowers switching losses and drive current requirements. These two characteristics determine that it can break through the 250kHz operating limit of SiC, pushing the switching frequency to 500kHz or even 1MHz. The direct benefit of frequency multiplication is that the volume of magnetic components (such as transformers and inductors) can be reduced exponentially, thereby unlocking extremely high power density.
From the perspective of market competition, high-voltage SiC above 1700V has long maintained high prices due to a lack of competitors, and SiC wafers consume extremely high energy during growth and slicing processes. The emergence of PI's 2200V GaN breaks this monopoly. It not only replaces complex low-voltage series solutions with a single-device single-stage topology but also makes it possible for high-voltage power systems to achieve both compact size and low temperature rise.
Photovoltaic and Energy Storage Markets Will See Rigid Demand Materialize First
Regarding market deployment predictions, according to information provided by PI, the progress of this technology can better match the upgrade demands of high-voltage data centers, NEVs, renewable energy, and high-voltage direct current (HVDC) transmission infrastructure.
Image source: Power Integrations
Jennifer Lloyd, President and CEO of PI, also stated that the launch of 2200V GaN expands the application range of GaN to the voltage range previously dominated by SiC, providing competitive high-frequency alternative solutions for application fields such as photovoltaics, HVDC transmission, and high-end industrial power conversion.
So, which application markets will see deployment first? Jason Yan revealed that photovoltaic and battery energy storage systems (BESS) are widely considered the rigid demand markets where this technology will first achieve commercial deployment. In the current domestic and international PV and energy storage markets, the 1500V DC bus architecture is already being widely adopted, and frontline engineers have an urgent need for "single-device high-voltage power distribution." The sufficient voltage margin and robust switching performance of 2200V PowiGaN precisely capture this market dividend.
In contrast, the AI data center and NEV markets lean more toward medium- to long-term technology deployment. In the data center field, the mainstream is currently transitioning from 48V to 800V DC bus architectures. Although the technology roadmaps of giants like NVIDIA plan for the next-generation 1500V DC power distribution architecture, it is still in the early R&D and route planning stage. In the automotive field, the highest architecture for mass-produced vehicles is currently 800V, and 1500V ultra-high voltage exists only in a very few racing scenarios. However, the trend of upgrading auxiliary power supplies in automotive-grade systems from 12V to 48V buses is clear. As the output voltage increases, the voltage withstand requirements for the switching devices on the primary side of the flyback topology will also surge accordingly, which will be another important stage for 2200V GaN in the future.
Being a Technology Pioneer
"This technology has just been launched and is currently in the technology demonstration stage, with the first commercial product under intensive development," Jason Yan admitted. The biggest test for bringing new technology to market lies in the replacement risk for customers and the cost of re-validation.
High-voltage main power systems carry large amounts of power and pose high risks. The original high-voltage SiC solutions have been validated by the market over a long period. For engineers, switching to a single-device 2200V GaN means the entire board needs to be re-laid out, the creepage distance design for high- and low-voltage pins needs to be redone, and it must undergo lengthy system-level reliability certifications such as high-temperature high-humidity and high-temperature reverse bias (HTRB). Customers will not take the risk of replacing it simply because of a lower price. They will only have a strong motivation to switch when they urgently need to reduce the overall system size and lower the temperature rise to beat their competitors.
To this end, PI is conducting a series of extremely rigorous physical sample tests internally. It has successfully demonstrated excellent results with continuous switching operation for 20 hours under 1760V/1.5A converter conditions, with zero drift in the on-resistance (RDS(ON)), using real experimental data to eliminate early market concerns.
Conclusion
Jason Yan emphasized that since the launch of 750V products in 2018, PI's PowiGaN chip shipments have exceeded 200 million units, with a proven failure rate of less than 1 FIT (fewer than 1 failure per billion hours). Its supply chain and robustness have long been validated by the market.
The release of this 2200V PowiGaN technology heralds the arrival of an era of high-frequency, high-efficiency, and ultra-simplified single-stage high-voltage power conversion. As predicted by Yole Group, the market size for power GaN devices will reach $3.5 billion by 2031, and the commercial deployment of high-voltage GaN technology will become a crucial driving force for industry scale growth.