As Gallium Nitride (GaN) technology becomes increasingly prevalent in space power systems, designers are leveraging its inherent capabilities to deliver higher efficiency, faster switching speeds, and greater power density. These advantages help designers support the growing demands of modern satellite platforms. While GaN devices are central to many modern power architectures, achieving their full efficiency and switching performance depends on the gate driver that controls them. Infineon HiRel’s new, rad hard single-channel gate driver for GaN delivers the precise drive conditions that GaN devices require. Designed specifically for extreme environment applications, the device incorporates an integrated low dropout regulator (LDO). The LDO simplifies gate-drive implementation while providing a tightly regulated voltage optimized for GaN operation, while also reducing the total bill of materials (BOM). GaN performance starts at the gate driver The switching advantages of GaN stem from device characteristics such as low gate charge, reduced output capacitance, and fast transition times. These attributes enable lower switching losses and support operation at higher frequencies than traditional silicon MOSFET (Si) technologies. Designers must provide stable and controlled gate-drive voltages to achieve optimal switching behavior. Even relatively small variations in gate voltage can affect switching losses, power-stage efficiency, electromagnetic interference (EMI), device stress, and long-term reliability. GaN devices have extremely high slew rates (dv/dt) when switching. As a result, maintaining a stable and well-controlled gate-drive voltage is critical for predictable system performance across operating conditions. Improve drive consistency Traditionally, designers generate the gate-drive supply rail using external regulators, bias circuits, or dedicated auxiliary power supplies. While effective, these approaches add components, consume board area, and create additional design considerations related to regulation accuracy, startup behavior, and power sequencing. In space systems, every additional component increases design complexity. It can also drive up qualification and testing costs, add weight, and extend development timelines. Infineon HiRel’s new RIC70115 gate driver simplifies this architecture with many integrated features, such as an integrated LDO that generates a tightly regulated 4.8 V gate-drive rail from input voltages ranging from 4.75 V to 15 V. By regulating the gate-drive supply internally, the RIC70115 helps ensure that GaN transistors receive a consistent drive voltage, even as upstream supply rails vary during normal operations. This approach aligns directly with recommendations outlined in the application note , which emphasizes the importance of maintaining tightly controlled gate-drive conditions to support efficient and reliable GaN HEMT operation in space environments. Even better is that no additional external components are needed to deliver this regulated drive voltage, helping customers meet their SWaP-C needs. For space programs operating under tight development timelines, this reduction in design complexity can support faster qualification efforts and lower implementation risk. Reducing design complexity Space power systems present unique challenges beyond those encountered in terrestrial applications. Every additional component introduces potential reliability considerations, increases PCB area requirements, and compromises qualification and system-level verification efforts. The integrated LDO within the RIC70115 eliminates the need for a separate bias regulator dedicated to the gate driver. This results in a more streamlined power architecture that supports the industry’s ongoing pursuit of reduced size, weight, and power (SWaP) advantages. By consolidating gate-drive regulation within the controller itself, designers can reduce component count without sacrificing the precision required for