Navitas Semiconductor has been selected by NVIDIA to support its 800V HVDC data center architecture for ‘Kyber’ rack-scale systems powering GPUs, including Rubin Ultra, using Navitas’ GaNFast gallium nitride (GaN) and GeneSiC silicon carbide (SiC) technologies. The architecture targets 1 MW IT racks and beyond.
The 800V HVDC system converts 13.8 kV AC grid power to 800V HVDC at the data center perimeter using solid-state transformers and industrial-grade rectifiers, eliminating multiple AC/DC and DC/DC conversion steps. This reduces copper wire thickness by up to 45% due to lower I2R losses compared to traditional 54V DC systems, which require over 200 kg of copper for a 1 MW rack. The 800V HVDC directly powers IT racks, with DC-DC converters reducing voltage for GPUs.
Navitas’ GaNSafe power ICs feature integrated control, drive, sensing, and protection, including short-circuit protection (350ns latency), 2kV ESD protection, and programmable slew rate control, requiring only four pins. Navitas also offers medium-voltage (80-120V) GaN devices for secondary-side DC-DC conversion in 48V-54V AI data center power supplies. The GeneSiC ‘trench-assisted planar’ SiC technology supports voltages from 650V to 6.5 kV, with applications in MW energy storage and grid-tied inverters for the Department of Energy.
Navitas previously introduced a 3.2 kW CRPS in August 2023, 40% smaller than legacy silicon solutions, followed by a 4.5 kW CRPS with 137 W/in³ power density and over 97% efficiency. In November 2024, Navitas released an 8.5 kW AI data center power supply meeting Open Compute Project and Open Rack v3 specifications, achieving 98% efficiency. Using its IntelliWeave digital control technique with GaNSafe and Gen 3-Fast SiC MOSFETs, Navitas achieved PFC peak efficiencies of 99.3% and reduced power losses by 30%. A 12 kW PSU was presented at Navitas’ ‘AI Tech Night’ on May 21, 2025, during the Computex exhibition in Taiwan.
The 800V HVDC architecture is expected to improve end-to-end power efficiency by up to 5%, reduce maintenance costs by 70% due to fewer PSU failures, and lower cooling costs by directly connecting HVDC to IT and compute racks.
