Ai Datacenter Power Delivery Shift To High Voltage And Multilevel Conversion
Sources: 1 • Confidence: Medium • Updated: 2026-03-25 17:57
Key takeaways
- An ISOP multilevel converter topology is presented as a favored way to handle 800 V using eight 100 V stages with outputs paralleled around 12.5 V.
- Proposed U.S. policy changes are described as aiming to limit repeated patent challenges to a single forum and single proceeding.
- International Rectifier was founded in 1947, and Alex Lidow joined the company after his PhD in 1977.
- EPC launched its first product in June 2009 and entered mass production in March 2010, later expanding to hundreds of parts across multiple technology generations.
- EPC integrated a GaN half-bridge in 2014 and by 2017 integrated drivers, level shifting, and protection circuitry, described as a hit product for motor drives and used in many humanoid robots.
Sections
Ai Datacenter Power Delivery Shift To High Voltage And Multilevel Conversion
- An ISOP multilevel converter topology is presented as a favored way to handle 800 V using eight 100 V stages with outputs paralleled around 12.5 V.
- EPC began getting its GaN FETs designed onto NVIDIA boards through module makers around 2019.
- NVIDIA is described as selecting an 800 V DC distribution approach as a leading candidate for delivering megawatt-scale power efficiently to server boards.
- Multiple competing architectures are described for converting 800 V to GPU point-of-load rails, including 800-to-12 V, 800-to-6 V, and 800-to-50 V at either rack or board level.
- At 6 kW output, stepping down from 800 V implies about 7.5 A input current, enabling smaller interconnects than low-voltage high-current distribution.
- The described ISOP example is claimed to reach roughly 97% efficiency and to be thin because each stage runs around 1 MHz with ripple reduction via interleaving stages.
Space Rad Hard And Ip Enforcement Environment
- Proposed U.S. policy changes are described as aiming to limit repeated patent challenges to a single forum and single proceeding.
- Patent enforcement is described as harder in the United States than in China or Germany because challengers can relitigate across multiple forums repeatedly.
- Radiation-hard advantages of GaN are described as avoiding MOS oxide charge trapping that shifts threshold voltage, having stronger bonds that reduce displacement damage, and using design measures to prevent destructive electric-field spikes from charged particle strikes.
- InnoScience is described as a Chinese, government-funded competitor created to imitate EPC, and EPC is engaged in patent disputes with it across multiple countries.
- EPC is claimed to have about 30% of the satellite power MOSFET business, displacing what is described as a formerly 100% Infineon position based on older International Rectifier designs.
- EPC developed radiation-hardened GaN transistors and ICs and claims rapid adoption in satellites and a large market share increase from near zero within five years.
Power Mosfet Origin And Scaling
- International Rectifier was founded in 1947, and Alex Lidow joined the company after his PhD in 1977.
- Alex Lidow and Tom Herman developed what became commercially viable as the power MOSFET in the late 1970s, contributing to displacement of bipolar transistors in power conversion.
- International Rectifier set an early commercialization target of a 400 V, 1 ohm MOSFET to enable a single-ended flyback AC-DC switching power supply topology.
- The HexFET concept shifted from a racetrack layout to a cell-based structure that increased density by roughly 3x, with a HexFET launch by 1979.
- Infineon is described as a major surviving power semiconductor contender from that era and later acquired International Rectifier.
Gan On Silicon Manufacturing As Capital Strategy
- EPC launched its first product in June 2009 and entered mass production in March 2010, later expanding to hundreds of parts across multiple technology generations.
- Archie Wang agreed to run EPC’s GaN wafers in an older six-inch fab in Taiwan and became a long-term partner, enabling EPC to operate without venture funding.
- EPC expanded from an initial six-inch foundry relationship to also using an eight-inch foundry (Vanguard International) and increased the share of its product line that is integrated circuits.
- EPC’s core strategy is described as improving power devices using GaN-on-silicon and moving from discrete transistors toward integrated power ICs.
- EPC’s early thesis was that running GaN wafers in a standard silicon foundry alongside silicon wafers could drastically reduce required startup capital, despite initial foundry resistance due to gallium contamination concerns.
Integration And Market Positioning Claims
- EPC integrated a GaN half-bridge in 2014 and by 2017 integrated drivers, level shifting, and protection circuitry, described as a hit product for motor drives and used in many humanoid robots.
- 75% of the power MOSFET market is claimed to be under 200 V and 21% above 400 V.
- The 600 V GaN charger market is described as commoditized with many entrants competing mainly on price, leading EPC to avoid that segment.
- EPC is described as focusing on 200 V and below and claiming margins above 50% and rapid growth in that positioning.
- In low-voltage GaN, EPC is described as having only two meaningful competitors: Infineon and InnoScience.
Watchlist
- Proposed U.S. policy changes are described as aiming to limit repeated patent challenges to a single forum and single proceeding.
Unknowns
- What independent measurements substantiate the claimed AI server board energy savings when using GaN versus silicon MOSFET implementations under comparable operating conditions?
- What primary-source evidence confirms whether NVIDIA (or its ecosystem) is standardizing on 800 V DC distribution, and what exact specifications (bus voltage, safety/connector standards, conversion stages) are being adopted?
- What are the verified market size and voltage-segment shares for the power MOSFET market, and do they align with the cited under-200 V and above-400 V percentages?
- What external evidence supports the claimed EPC unit shipment volumes and growth by end-market (robots, AI, autonomous machines, space)?
- What is the documented status, scope, and outcomes of EPC’s patent disputes with InnoScience across the referenced countries?