An independently designed 12 V to 5 V, 1 A synchronous buck molecule (TI TPS54202), with calculations, ngspice and PSpice simulation, KiCad 10 schematic and board, and the board laid out and analysed with adom-aiflow.
Schematic v2: U1 now the Adom-style TPS54202DDCR symbol with the 3D-chip outline (kicad/lib/buck12v5v.kicad_sym, built by kicad/tools/u1-symbol/make_u1_symbol.py); layout re-spaced around it. Nets/values/footprints identical to v1, ERC 0
Schematic v2: datasheet-style layout from kicad/gen_schematic_v2.py (netlist identical to v1, ERC 0); sym-lib-table adds the Buck_Power local power symbols
Schematic v2: datasheet-style layout (wired power path, local power symbols, sections), generated by kicad/gen_schematic_v2.py; netlist identical to v1 (kept as .kicad_sch.v1), ERC 0