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

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- 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>
This commit is contained in:
noise
2026-07-02 07:03:31 -04:00
parent 261bf48bb4
commit 13496b302c
4 changed files with 543 additions and 13 deletions
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39
carrier/CM5IO.kicad_sym
View File

@@ -10292,4 +10292,43 @@
)
)
)
(symbol "TPS54202"
(pin_names (offset 1.016))
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(property "Reference" "U" (at 0 12.7 0) (effects (font (size 1.27 1.27))))
(property "Value" "TPS54202" (at 0 -16.51 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-23-6" (at 0 0 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Datasheet" "https://www.ti.com/lit/ds/symlink/tps54202.pdf" (at 0 0 0) (effects (font (size 1.27 1.27)) (hide yes)))
(symbol "TPS54202_0_1"
(rectangle (start -10.16 10.16) (end 10.16 -10.16) (stroke (width 0.254) (type default)) (fill (type background)))
)
(symbol "TPS54202_1_1"
(pin power_in line (at -13.97 5.08 0) (length 3.81)
(name "VIN" (effects (font (size 1.27 1.27))))
(number "3" (effects (font (size 1.27 1.27))))
)
(pin passive line (at -13.97 0 0) (length 3.81)
(name "EN" (effects (font (size 1.27 1.27))))
(number "5" (effects (font (size 1.27 1.27))))
)
(pin passive line (at 13.97 5.08 180) (length 3.81)
(name "BOOT" (effects (font (size 1.27 1.27))))
(number "6" (effects (font (size 1.27 1.27))))
)
(pin output line (at 13.97 2.54 180) (length 3.81)
(name "SW" (effects (font (size 1.27 1.27))))
(number "2" (effects (font (size 1.27 1.27))))
)
(pin passive line (at 13.97 -2.54 180) (length 3.81)
(name "FB" (effects (font (size 1.27 1.27))))
(number "4" (effects (font (size 1.27 1.27))))
)
(pin power_in line (at 0 -13.97 90) (length 3.81)
(name "GND" (effects (font (size 1.27 1.27))))
(number "1" (effects (font (size 1.27 1.27))))
)
)
)
)