TPS562201 12V → 3.3V Buck Molecule

{
  "schema_version": 1,
  "type": "app",
  "slug": "tps562201-buck",
  "title": "TPS562201 12V → 3.3V Buck Molecule",
  "brief": "A 24x16 mm 4-pin power brick using TI's TPS562201 synchronous buck. 12 V in, 3.3 V out at 500 mA (3 A silicon — 6x thermal headroom). 45.3k/10k feedback divider hits exactly 3.30 V. Reference DC-DC ex",
  "version": "1.0.0",
  "tags": [],
  "license": "MIT",
  "sample_prompts": [
    {
      "label": "Preview",
      "prompt": "Open the TPS562201 buck molecule in adom-tsci"
    },
    {
      "label": "BOM",
      "prompt": "What is the Mouser BOM for this buck board?"
    },
    {
      "label": "Retune",
      "prompt": "Swap the feedback divider to deliver 5V out instead of 3.3V"
    },
    {
      "label": "Use",
      "prompt": "Drop this buck into a workcell layout to power a 3.3V rail"
    },
    {
      "label": "Walkthrough",
      "prompt": "Start the walkthrough demo for the buck design"
    },
    {
      "label": "Source",
      "prompt": "Show the tscircuit source for this molecule"
    }
  ],
  "install": {
    "binary_name": "tps562201-buck",
    "install_dir": "",
    "install_hint": "",
    "version_cmd": ""
  },
  "readme": "# TPS562201 12V → 3.3V Buck Molecule\n\nA 24 × 16 mm 4-pin power brick based on TI's **TPS562201** synchronous buck converter. Takes **12 V** in on the left-edge contacts, delivers **3.3 V at up to 500 mA** on the right-edge contacts. Silicon is rated for 3 A so 500 mA sits at ~6× thermal headroom — the board runs cool under spec.\n\nShipping as an adom-tsci example, fully interactive in the Hydrogen webview (3D / PCB / Schematic / Parts tabs, Inspect + Measure tools, deterministic Walkthrough Demo).\n\n## Why this board exists\n\nMost power-sourcing flows in Adom need a clean 3.3 V rail. Rather than re-inventing that on every new project, this is the reference molecule: drop it into a workcell layout, connect VIN and GND, pull 3.3 V off the output pins. Also serves as the canonical \"simple DC-DC\" example for anyone learning the tscircuit / adom-tsci stack.\n\n## The components\n\n| Ref | Value | Footprint | Role |\n|---|---|---|---|\n| U1 | TPS562201 | SOT-23-6 | Synchronous buck. Internal MOSFETs, internal compensation, 580 kHz switching, 4.5–17 V input. |\n| C1 | 10 µF / 25 V | 0805 | Input cap — absorbs VIN ripple when the high-side MOSFET switches on. |\n| L1 | 2.2 µH shielded / 3 A | 0805 | Energy-transfer inductor. Ripple ≈ 30 % of Iout_max at 580 kHz — sweet spot between core size and filter burden. |\n| C3 | 22 µF / 10 V | 0805 | Output cap — smooths the switching waveform, handles load steps. |\n| C2 | 100 nF / 25 V | 0402 | Bootstrap cap — drives the high-side gate. |\n| R1 | 45.3 kΩ (E96) | 0402 | Feedback-divider top. |\n| R2 | 10 kΩ | 0402 | Feedback-divider bottom. `Vout = 0.596 × (1 + R1/R2) = 3.296 V` → exactly **3.3 V** to one decimal. |\n| R3 | 100 kΩ | 0402 | EN pull-up — rail is always-on. Replace with a GPIO trace if the host should gate the rail. |\n\n**External pins** (24 × 16 mm brick):\n\n- Left edge: **VIN (12 V)** and **GND**\n- Right edge: **VCC (3.3 V)** and **GND**\n\nTwo GND pins so the return path through a workcell jig is low-impedance on both sides.\n\n**Test points** (probing workcell):\n\n- `TP_VIN` / `TP_VCC` — steady DC verification\n- `TP_GND` — reference\n- `TP_SW` — **scope probe point**. Carries the switching waveform (12 V → 0 V rectangles at 580 kHz). Fastest way to confirm the converter is running / stuck / oscillating.\n\n## Mouser BOM\n\nFort Worth drone delivery, Mouser-preferred per Adom sourcing defaults.\n\n| Ref | MPN | Mouser P/N | Stock | Unit @ 1 |\n|---|---|---|---|---|\n| U1 | TPS562201DDCR | 595-TPS562201DDCR | 27,479 | $0.39 |\n| L1 | Coilcraft XFL3012-222ME (2.2 µH / 3 A) | 994-XFL3012-222ME | 5k+ | ~$0.90 |\n| C1 | 10 µF 25 V X5R 0805 (jelly-bean) | any | 10k+ | ~$0.30 |\n| C3 | 22 µF 10 V X5R 0805 (jelly-bean) | any | 10k+ | ~$0.25 |\n| C2 | 100 nF 25 V X7R 0402 | any | — | <$0.05 |\n| R1 | 45.3 kΩ 1 % 0402 (E96) | any | — | <$0.05 |\n| R2 | 10 kΩ 1 % 0402 | any | — | <$0.05 |\n| R3 | 100 kΩ 1 % 0402 | any | — | <$0.05 |\n\nRough BOM cost: ~**$2.00** in singles, ~**$1.25** at 100×. All parts Mouser-stocked, Fort Worth drone-deliverable in 40 min.\n\n## Running it locally\n\n```bash\n# clone adom-tsci (or install from the wiki) and launch the example\ngit clone https://github.com/adom-inc/adom-tsci\ncd adom-tsci/examples/TPS562201-12V-to-3V3-Molecule\nbun install\nadom-tsci start . --port 8889\n# A Hydrogen webview tab opens showing 3D / PCB / Schematic / Parts.\n```\n\nOr directly against the installed adom-tsci:\n\n```bash\nadom-tsci start ~/project/adom-tsci/examples/TPS562201-12V-to-3V3-Molecule --port 8889\n```\n\n## Design review notes\n\n- **Vref is 0.596 V**, not 0.8 V like some TI bucks. If you swap R1/R2 to retune, use this ratio: `Rtop/Rbot = (Vout / 0.596) − 1`.\n- **EN pulled high via 100 kΩ** — rail is always-on. If you need GPIO-gated startup, break R3 and route EN to a host pin. Add a 100 nF cap from EN to GND if the control signal is noisy.\n- **Bootstrap cap on SW ↔ VBST** is *required*, not optional. The high-side MOSFET gate driver is charge-pumped from this cap. Don't omit.\n- **The two GND pins** aren't just aesthetic — they pair with VIN and VCC on opposite edges so a jig fixture can route both sides' return current independently. Keeps ground loops out of whatever signal chain is sharing the workcell.\n\n## Changelog\n\n- **v1.0.0 (2026-04)** — initial ship: 3.3 V @ 500 mA, 45.3 k / 10 k divider (exact 3.30 V), 4-pin brick, 4 testpoints, bottom-silk ID card. Provenance-stamped walkthrough.\n\n## Source\n\n[adom-inc/adom-tsci · examples/TPS562201-12V-to-3V3-Molecule](https://github.com/adom-inc/adom-tsci/tree/master/examples/TPS562201-12V-to-3V3-Molecule)\n",
  "author": {
    "id": "695820315b5f1e4db2fcf602",
    "name": "Kyle Bergstedt",
    "email": "[email protected]"
  },
  "visibility": {
    "public": true
  },
  "hero": null,
  "discovery_triggers": [],
  "discovery_pitch": null,
  "metadata": {},
  "created_at": "2026-05-28T05:29:19.991Z",
  "updated_at": "2026-05-28T05:29:19.991Z",
  "skills": []
}