The 800 VDC architecture represents a highly efficient and scalable power delivery system, poised to transform data center design by enabling gigawatt-scale AI factories. ROHM offers a broad range of power devices, including silicon (Si), silicon carbide (SiC), and gallium nitride (GaN), and is one of the few companies worldwide with the technological expertise to develop analog integrated circuits (control and power integrated circuits) capable of maximizing device performance.
The white paper includes ROHM's comprehensive power solutions, covering a wide range of power devices and analog integrated circuit technologies, supported by thermal design simulations, board-level design strategies, and real-world implementation examples.
Key Highlights from the Technical Report
• Increased Rack Power Consumption: Power demand per rack in AI data centers is rapidly increasing, pushing conventional 48V/12V DC power systems to their limits.
• Shift to 800VDC: Transitioning to an 800VDC architecture significantly improves data center efficiency, power density, and sustainability.
• Redefined Power Conversion: In the 800VDC system, AC-to-DC conversion (PSU), traditionally performed within server racks, is moved to a dedicated power rack.
• Essential Role of SiC and GaN: Broadband devices are critical for achieving efficient performance. By moving AC-to-DC conversion outside the IT rack, higher-density configurations within the IT rack can better support GPU integration.
• Optimized conversion topologies: Each conversion stage, from AC to 800 VDC in the power rack and from 800 VDC to lower voltages in the IT rack, requires specialized solutions. ROHM's SiC and GaN devices contribute to greater efficiency and reduced noise, while also decreasing the size of peripheral components, which significantly increases power density.
• Innovative device technologies: ROHM's EcoSiC™ series offers superior cooling modules with industry-leading low resistance, ideal for AI servers, while the EcoGaN™ series combines GaN performance with proprietary analog IC technologies, such as Nano Pulse Control™. This enables stable gate driving, ultra-fast control, and high-frequency operation—features that have garnered significant market acclaim.
The shift to an 800VDC infrastructure is a collective industry effort. ROHM is working closely with NVIDIA, data center operators, and power system designers to deliver essential broadband semiconductor technologies for next-generation AI infrastructure. Through strategic collaborations, including a partnership with Delta Electronics in 2022, ROHM continues to drive innovation in SiC and GaN power devices, enabling powerful, sustainable, and energy-efficient data center solutions.
