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E-003 — DEC-003 — Local rail voltage generation: 5V, 3V3, 1V8 from 20V input decision

Created by demo · 2026-06-08

History

Details

Decision

The adapter shall generate three local regulated supply rails on-board from the 20V USB PD input: 5V, 3V3, and 1V8.

Rationale

Module slots require standard logic supply voltages. Generating them locally avoids dependency on host equipment.

Rejected alternatives

None discussed — requirement stated directly by engineer.

Follow-up

  • Capture as formal requirements in SPECIFICATION.md.
  • Select regulator topology (LDO vs switching) during schematic capture.

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