noise 13496b302c Power stage 4: TPS54202 15V->+3V3_AUX 1A quiet-rail buck (power sheet complete) ...

- TPS54202 SOT-23-6 sync, fixed 500kHz; custom symbol CM5IO:TPS54202 (KiCad
  lib symbol extends TPS54302 with no own pins, cannot embed standalone)
- Abs-max gate: VIN 30V vs SMBJ18A clamp <=29.2V at rated surge (0.8V margin,
  transient-only) - documented, passed
- FB 100k/22.1k + 56pF Cff per TI 3.3V table -> 3.29V (SPICE: vfb 0.597V,
  inrush settles 3.315V); L 10uH, Cout 2x22uF/16V
- EN abs-max 7V -> UVLO divider 866k/110k from VIN_PROT (start 10.13V /
  stop 8.61V, EN ~1.9V at 15V); no direct VIN tie
- Renamed input cap C_IN33A -> C_IN33Aa: SPICE names are case-insensitive and
  collided with stage-3 C_IN33a, silently skipping the VIN_PROT decoupling sim
- Verify: ERC 133->133 zero new; analyzer +65/-0 zero regressions;
  SPICE 23 pass / 2 benign warn / 0 fail / 0 skip

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-02 07:03:31 -04:00

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