Cambridge GaN Devices’ ICeGaN technology

The paper, entitled ‘A GaN HEMT with Exceptional Gate Over-Voltage Robustness’, presented by researchers from Virginia Tech and Daniel Popa, Director of Innovation & Research, CGD, provides experimental evidence that shows that ICeGaN HEMTs, enabled by smart protection circuitry, show an exceptionally high over-voltage margin of over 70V, which is comparable to state-of-the-art traditional silicon devices, and possibly even higher.

Daniel Popa | Director of Innovation & Reserach, CGD, says: “Accidental high drive voltage is a critical concern for the gate reliability and driver design of GaN HEMT devices. State-of-the-art GaN HEMTs survive around 25V, which can be within gate voltage overshoots in applications such as converters, resulting in device failure. Until ICeGaN, higher breakdown voltage values of 70V and more, were only possible with state-of-the-art SiC and superjunction devices.”

ICeGaN HEMTS possess a unique set of intrinsic capabilities, that together elevate device reliability well above current state-of-the-art GaN devices from competitors while approaching the ruggedness of state-of-the-art Si-based devices. In addition to the hugely elevated dynamic gate breakdown capability, enabled by the inclusion of a fully integrated GaN smart circuitry, and confirmed by the Virginia Tech research, ICeGaN technology has a higher voltage threshold of 3V, higher voltage range (0–20V), and a stronger gate voltage clamping action at lower temperatures.

More, a novel Miller-clamp design, also integrated within the smart ICeGaN circuitry, ensures immunity against high dV/dt and dI/dt events and obviates the need for negative gate voltages for turning off (and keeping off) the HEMT, which in turn reduces exposure to dynamic R_on stress.

Andrea Bricconi | Chief Commercial Officer, CGD, comments: “The two major advantages of CGD’s ICeGaN technology are ease-of-use and reliability. Our design, which integrates smart protection circuitry fabricated in GaN on-chip with the HEMT, facilitates both these key benefits, enabling devices to be driven like a MOSFET - without the need for special gate drivers, complex and lossy driving circuits, negative voltage supply requirements or additional clamping components – and to survive rugged and challenging application conditions.”