project
12 V to 5 V / 1 A Buck Molecule (TPS54202)
Public Unreviewedby John Lauer
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.
← Commit history
Link every part to its Adom wiki page; drop tools that weren't used
4 files changed
+43−22
README.md+23@@ -53,6 +53,29 @@ About four minutes, start to finish: the prompt in [Adom Hydrogen](https://wiki. Probe pads: TP1 SW (15.6, 4.9), TP2 FB (9.4, 5.6), TP3 VOUT (21.6, 4.9), TP4 GND (15.6, 2.8). +## Parts on the Adom wiki++Every part on this board has its own page on the Adom wiki, with its symbol, footprint and 3D model, ready to reuse in your own designs.++| ref | part | page |+|---|---|---|+| U1 | TI TPS54202DDCR buck regulator | [TPS54202DDCR](https://wiki.adom.inc/adom/tps54202ddcr) |+| L1 | 15 uH inductor, Abracon | [AMPLH5030S-150MT](https://wiki.adom.inc/john/amplh5030s-150mt) |+| C1 | 47 uF 35 V electrolytic, Panasonic | [EEE-FK1V470P](https://wiki.adom.inc/john/eee-fk1v470p) |+| C2, C3 | 10 uF 25 V X7R 1206, Yageo | [CC1206KKX7R8BB106](https://wiki.adom.inc/john/cc1206kkx7r8bb106) |+| C4, C5 | 100 nF 50 V X7R 0603, Walsin | [0603B104J500CT](https://wiki.adom.inc/adom/0603b104j500ct) |+| C6, C7, C8 | 22 uF 10 V X5R 0805, Samsung | [CL21A226MPQNNNE](https://wiki.adom.inc/adom/cl21a226mpqnnne) |+| C9 | 68 pF C0G 0402, Walsin | [0402N680J500CT](https://wiki.adom.inc/adom/0402n680j500ct) |+| R1 | 68 k 0402, Bourns | [CR0402-FX-6802GLF](https://wiki.adom.inc/adom/cr0402-fx-6802glf) |+| R2 | 5.6 k 0402, Bourns | [CR0402-FX-5601GLF](https://wiki.adom.inc/adom/cr0402-fx-5601glf) |+| R3, R7, R8 | 10 k 0402, Bourns | [CR0402-FX-1002GLF](https://wiki.adom.inc/adom/cr0402-fx-1002glf) |+| R4 | 1 M 0402, Bourns | [CR0402-FX-1004GLF](https://wiki.adom.inc/adom/cr0402-fx-1004glf) |+| R5 | 150 k 0402, Bourns | [CR0402-FX-1503GLF](https://wiki.adom.inc/adom/cr0402-fx-1503glf) |+| R6 | 2.2 k 0402, Bourns | [CR0402-FX-2201GLF](https://wiki.adom.inc/adom/cr0402-fx-2201glf) |+| D1 | green LED 0603, Inolux | [IN-S63BTG](https://wiki.adom.inc/adom/in-s63btg) |+| MP1 to MP4 | medium machine pin, Adom | [MachinePinMediumShort](https://wiki.adom.inc/adom/machinepinmediumshort) |+| J1 to J6 | medium machine contact, Adom | [MachineContactMedium](https://wiki.adom.inc/adom/machinecontactmedium) |+ ## Feature guides | guide | what it covers |
docs/design.md+1−1@@ -4,7 +4,7 @@ This page walks through how each part value on the molecule was chosen. The equa ## The brief -The TPS54202 datasheet and its part data were gathered with [Chip Fetcher](https://wiki.adom.inc/adom/adom-chip-fetcher). The schematic symbols come from [adom-symbol](https://wiki.adom.inc/adom/adom-symbol) and [Adom Library](https://wiki.adom.inc/adom/adom-lbr), including the 3D chip outlines on U1, C1, L1 and D1, drawn from each part's STEP model on [Adom Step2GLB](https://wiki.adom.inc/adom/adom-step2glb), Adom's OpenCascade service.+The TPS54202 datasheet and its pin data are on the part's [Adom wiki page](https://wiki.adom.inc/adom/tps54202ddcr). The schematic symbols come from [adom-symbol](https://wiki.adom.inc/adom/adom-symbol) and [Adom Library](https://wiki.adom.inc/adom/adom-lbr), including the 3D chip outlines on U1, C1, L1 and D1, drawn from each part's STEP model on [Adom Step2GLB](https://wiki.adom.inc/adom/adom-step2glb), Adom's OpenCascade service. The brief comes from the YouTube video "Hardware Design with GPT-6: Schematic, PSpice & PCB" by Inside Embedded: 12 V in, 5 V at 1 A out, with terminals and test points. We designed it again from scratch rather than copying it. The part choice, the values, the schematic and the layout are all our own. Only the requirements are shared.
docs/sourcing.md+19−19@@ -20,28 +20,28 @@ Two rules shaped the parts list: Parts were found with [Adom Parts Search](https://wiki.adom.inc/adom/adom-parts-search) (Mouser, DigiKey and JLCPCB in one search), with Adom Basic Parts first for the commodity passives and LEDs. -Stock was checked on 2026-09-29.+Stock was checked on 2026-09-29. Every part number links to its page on the Adom wiki, with its symbol, footprint and 3D model. | ref | value | MPN | maker | package | source | Mouser PN | Mouser stock | |---|---|---|---|---|---|---|---|-| U1 | sync buck 4.5 to 28 V, 2 A, 500 kHz | TPS54202DDCR | Texas Instruments | SOT-23-6 (DDC) | Mouser | 595-TPS54202DDCR | 160 (140-day lead) |-| L1 | 15 uH | AMPLH5030S-150MT | Abracon | 5.6 x 5.2 x 2.8 mm | Mouser | 815-AMPLH5030S-150T | 1577 |-| C1 | 47 uF 35 V electrolytic | EEE-FK1V470P | Panasonic | SMD case D, 6.3 x 5.8 mm | Mouser | 667-EEE-FK1V470P | 99272 |-| C2, C3 | 10 uF 25 V X7R | CC1206KKX7R8BB106 | Yageo | 1206 | Mouser | 603-CC126KKX7R8BB106 | 18168 |-| C4 | 100 nF 50 V X7R (VIN pin bypass) | 0603B104J500CT | Walsin | 0603 | Adom stock | | |-| C5 | 100 nF 50 V X7R (bootstrap) | 0603B104J500CT | Walsin | 0603 | Adom stock | | |-| C6, C7, C8 | 22 uF 10 V X5R | CL21A226MPQNNNE | Samsung | 0805 | Adom stock | | |-| C9 | 68 pF C0G (feed-forward) | 0402N680J500CT | Walsin | 0402 | Adom stock | | |-| R1 | 68 k (FB top, part 1) | CR0402-FX-6802GLF | Bourns | 0402 | Adom stock | | |-| R2 | 5.6 k (FB top, part 2) | CR0402-FX-5601GLF | Bourns | 0402 | Adom stock | | |-| R3 | 10 k (FB bottom) | CR0402-FX-1002GLF | Bourns | 0402 | Adom stock | | |-| R4 | 1 M (EN UVLO top) | CR0402-FX-1004GLF | Bourns | 0402 | Adom stock | | |-| R5 | 150 k (EN UVLO bottom) | CR0402-FX-1503GLF | Bourns | 0402 | Adom stock | | |-| R6 | 2.2 k (LED) | CR0402-FX-2201GLF | Bourns | 0402 | Adom stock | | |-| R7, R8 | 10 k (VMON divider) | CR0402-FX-1002GLF | Bourns | 0402 | Adom stock | | |-| D1 | green LED (power good) | IN-S63BTG | Inolux | 0603 | Adom stock | | |-| MP1 to MP4 | medium machine pin (GND) | MachinePinMediumShort | Adom | molecule pin | Adom stock | | |-| J1 to J6 | medium machine contact | MachineContactMedium | Adom | molecule contact | Adom stock | | |+| U1 | sync buck 4.5 to 28 V, 2 A, 500 kHz | [TPS54202DDCR](https://wiki.adom.inc/adom/tps54202ddcr) | Texas Instruments | SOT-23-6 (DDC) | Mouser | 595-TPS54202DDCR | 160 (140-day lead) |+| L1 | 15 uH | [AMPLH5030S-150MT](https://wiki.adom.inc/john/amplh5030s-150mt) | Abracon | 5.6 x 5.2 x 2.8 mm | Mouser | 815-AMPLH5030S-150T | 1577 |+| C1 | 47 uF 35 V electrolytic | [EEE-FK1V470P](https://wiki.adom.inc/john/eee-fk1v470p) | Panasonic | SMD case D, 6.3 x 5.8 mm | Mouser | 667-EEE-FK1V470P | 99272 |+| C2, C3 | 10 uF 25 V X7R | [CC1206KKX7R8BB106](https://wiki.adom.inc/john/cc1206kkx7r8bb106) | Yageo | 1206 | Mouser | 603-CC126KKX7R8BB106 | 18168 |+| C4 | 100 nF 50 V X7R (VIN pin bypass) | [0603B104J500CT](https://wiki.adom.inc/adom/0603b104j500ct) | Walsin | 0603 | Adom stock | | |+| C5 | 100 nF 50 V X7R (bootstrap) | [0603B104J500CT](https://wiki.adom.inc/adom/0603b104j500ct) | Walsin | 0603 | Adom stock | | |+| C6, C7, C8 | 22 uF 10 V X5R | [CL21A226MPQNNNE](https://wiki.adom.inc/adom/cl21a226mpqnnne) | Samsung | 0805 | Adom stock | | |+| C9 | 68 pF C0G (feed-forward) | [0402N680J500CT](https://wiki.adom.inc/adom/0402n680j500ct) | Walsin | 0402 | Adom stock | | |+| R1 | 68 k (FB top, part 1) | [CR0402-FX-6802GLF](https://wiki.adom.inc/adom/cr0402-fx-6802glf) | Bourns | 0402 | Adom stock | | |+| R2 | 5.6 k (FB top, part 2) | [CR0402-FX-5601GLF](https://wiki.adom.inc/adom/cr0402-fx-5601glf) | Bourns | 0402 | Adom stock | | |+| R3 | 10 k (FB bottom) | [CR0402-FX-1002GLF](https://wiki.adom.inc/adom/cr0402-fx-1002glf) | Bourns | 0402 | Adom stock | | |+| R4 | 1 M (EN UVLO top) | [CR0402-FX-1004GLF](https://wiki.adom.inc/adom/cr0402-fx-1004glf) | Bourns | 0402 | Adom stock | | |+| R5 | 150 k (EN UVLO bottom) | [CR0402-FX-1503GLF](https://wiki.adom.inc/adom/cr0402-fx-1503glf) | Bourns | 0402 | Adom stock | | |+| R6 | 2.2 k (LED) | [CR0402-FX-2201GLF](https://wiki.adom.inc/adom/cr0402-fx-2201glf) | Bourns | 0402 | Adom stock | | |+| R7, R8 | 10 k (VMON divider) | [CR0402-FX-1002GLF](https://wiki.adom.inc/adom/cr0402-fx-1002glf) | Bourns | 0402 | Adom stock | | |+| D1 | green LED (power good) | [IN-S63BTG](https://wiki.adom.inc/adom/in-s63btg) | Inolux | 0603 | Adom stock | | |+| MP1 to MP4 | medium machine pin (GND) | [MachinePinMediumShort](https://wiki.adom.inc/adom/machinepinmediumshort) | Adom | molecule pin | Adom stock | | |+| J1 to J6 | medium machine contact | [MachineContactMedium](https://wiki.adom.inc/adom/machinecontactmedium) | Adom | molecule contact | Adom stock | | | | TP1 to TP4 | probe pad | | | 1.0 mm bare copper pad | no part | | | U1 is the only thin-stock line. It is recorded in the BOM as "order early for builds beyond prototypes". On the 3rd party fab profile that is a note to the buyer, not a reason to switch to JLCPCB parts.
docs/tools.md−2@@ -17,7 +17,6 @@ To try the same flow, ask the AI in Hydrogen: *"Use adom-aiflow to design a 12 V | tool | what it did for this board | |---|---| | [adom-aiflow](https://wiki.adom.inc/adom/adom-aiflow) | Ran the board flow step by step: circuit, simulation, layout, copper pours, analysis, the rework loop and the molecule format. It also records a clip of every step. |-| [Chip Fetcher](https://wiki.adom.inc/adom/adom-chip-fetcher) | Gathered the datasheet and part data for the TPS54202. | | [Adom Parts Search](https://wiki.adom.inc/adom/adom-parts-search) | Searched Mouser, DigiKey and JLCPCB at once to find in-stock parts. | | [Adom Basic Parts](https://wiki.adom.inc/adom/adom-basic-parts) | The commodity passives and LEDs Adom stocks on reels, picked first for this board. | | [Adom SPICE](https://wiki.adom.inc/adom/adom-spice-skillpack) | Ran and compared ngspice, LTspice and PSpice for TI on one dashboard. |@@ -29,7 +28,6 @@ To try the same flow, ask the AI in Hydrogen: *"Use adom-aiflow to design a 12 V |---|---| | [adom-symbol](https://wiki.adom.inc/adom/adom-symbol) | Made the schematic symbols, with the 3D chip outlines on U1, C1, L1 and D1. | | [Adom Library](https://wiki.adom.inc/adom/adom-lbr) | Builds and translates part libraries for KiCad, Fusion 360 and Altium. |-| [Adom Footprint](https://wiki.adom.inc/adom/adom-footprint) | Footprint creation and checking. | | [Adom Step2GLB](https://wiki.adom.inc/adom/adom-step2glb) | Adom's OpenCascade service for STEP files: checked every 3D model, drew the chip outlines, and made the board's 3D model. | | [Adom Chip Laser](https://wiki.adom.inc/adom/adom-chip-laser) | Put each part number on its 3D model as a flat laser mark. |