You will own power delivery from rack input to die bump — defining the architecture, designing the regulators that feed the accelerator, and owning the control and protection behaviour that keeps the part inside its limits under real workloads. Senior IC role with architectural ownership: you define the power architecture, not implement someone else's.

What you will work on:
- Power architecture for a high-current AI accelerator — bus voltage, conversion stages, rail partitioning
- Multiphase VR design for sub-1 V, high-current core rails
- Rack-scale distribution: busbar, connector and cable current budgets across shelf, sled and rack
- Dynamic voltage scaling, droop response and closed-loop throttling
- Power sequencing, protection, telemetry and firmware interfaces

Responsibilities:
- Architecture: Define the end-to-end architecture — 12 V vs. 48 V, intermediate bus vs. direct conversion, lateral vs. vertical delivery — backed by loss, efficiency and thermal trade studies. Own the power budget from rack input to die,



and evaluate emerging architectures against schedule and supply reality.
- Circuit design: Design multiphase bucks for high-current core rails (phase count, magnetics, power stage, controller), plus auxiliary rails, clean analog supplies, and hot-swap/eFuse protection. Specify VR controllers, DrMOS and modules; own schematic capture and power layout constraints.
- Control & protection: Define the VR control interface (PMBus, AVSBus or PWM-VID), the throttling architecture across hardware, firmware and BMC timescales, transient and slew requirements, and OCP/OVP/UVP and thermal fault response.
- Validation & cross-functional: Own efficiency, transient, droop, ripple and thermal validation on real silicon. Partner with power integrity on PDN impedance and decoupling, with mechanical and thermal on placement and cooling, and with VR and passive vendors on requirements and reviews.

Requirements:
- 8+ years designing power delivery for high-performance

📌 Senior Power Delivery Engineer (Barcelona)
🏢 Semidynamics
📍 Barcelona