Theses›Datacentre & AI compute›Rack power delivery silicon

Rack power delivery silicon

AI rack power density is forcing a re-architecture of board- and rack-level power delivery (48V-plus distribution, vertical power delivery under the accelerator, point-of-load conversion for GPU/HBM rails), creating a power-conversion-silicon lane that is substrate-agnostic (silicon multiphase today, GaN where switching…

  • Bear
  • Closing
  • $13B by 2035

The call800V AI racks need power stepped down at the chip, but NVIDIA allocated every socket two years early and the one great independent sold the moment it mattered.

D1D2R1R2R3C1foragainst D1D2R1R2R3C1foragainst
Fig. 1The balance. Drivers and catalysts against restraints, each block sized by its weight; catalysts hang dashed because they have not happened yet, sized by their odds. It tips toward the restraints.
  1. D1NVIDIA's 800V DC architecture means power steps from 800V to under 1V at the chip, and moving regulation into the package adds about 1.7x conversion content per watt.
  2. D2In-package voltage regulation is a new slot nobody holds yet, if it goes merchant.
  3. R1Every visible 800V socket is pre-allocated to Infineon, ST, TI and Navitas two years before volume.
  4. R2Independents get bought the moment they matter, Empower for $1.5B, and Reed's $100M round prices the remaining entrant.
  5. R3800V removes conversion stages, so per-rack content may disappoint.
  6. C1TSMC's CoWoS-L integrated voltage regulator ships in a production accelerator, moving conversion into the package with 1.7x the content per watt.2028
Rests onthe beliefs underneath
Supported by · confidence
What would prove itdated tests, open and resolved
202720282029today123watch 202720282029today123watch
Fig. 2Each ring is a dated test: dashed while open, struck through when overdue, ticked or crossed once resolved.
  1. 1An independent AI-accelerator power startup raises $50M+ in one round or is designed into a named rack platform; otherwise the lane is closed.Dec 2027 · open
  2. 2A non-top-five vendor appears in a second hyperscaler's 800V architecture, or an OCP node-level conversion spec is published.Dec 2028 · open
  3. 3Conversion content per rack comes in below the 1.7x expectation as 800V removes stages.Dec 2028 · open
Expressionslisted, private, technologies
  • IFX.DEInfineon
    • cheap
     Auto power + microcontroller + SiC.
  • MPWRMonolithic Power Systems
    • full
  • VICRVicor
    • fair
  • TXNTexas Instruments
    • cheap
     Multiphase controllers, power stages, eFuses and hot-swap protection for AI servers, and a named 800VDC silicon partner of NVIDIA.
  • 6723.TRenesas Electronics
    • expensive
     Digital multiphase controllers and smart power stages for server CPU and GPU rails, sold to server makers and accelerator vendors.
  • ADIAnalog Devices (incl. Empower Semiconductor)
    • cheap
     Power-management ICs for servers plus, since July 2026, Empower's integrated voltage regulators that sit under the accelerator package.
  • ONonsemi
    • not screened
     Smart power stages, MOSFETs and controllers for AI server power, sold to server makers and power-supply vendors.
Private · 6 private companies, 5 of them in the US; none in continental Europe.

Ferric · Claros · VeloSwitch · Reed Semiconductor · Amber Semiconductor (AmberSemi) · PowerLattice

2 more private companies tracked, not shown

Technologies
Who has already bet on itprivate rounds, from public sources

$191M raised by 5 companies, $185M of it in the last three years. Wave building: Money is arriving: recent rounds and tier-1 funds are in, but no runaway leader yet.

Backed by a top-tier venture firm: PowerLattice, Claros.

What changedthe record, newest first
  • 16 Jul 2026Sized the AI rack power-conversion market properly: mid-single-billions growing near twenty percent a year, and the category's one great startup just sold to an incumbent for $1.5 billion. That exit is the whole story in one line: the market is real and venture-scale, and the way value leaves it is a trade sale the moment your socket matters. The open question is whether the 800-volt redesign creates a socket the five incumbents have not already been handed.
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