TPS54331

{
  "schema_version": 1,
  "type": "component",
  "slug": "tps54331",
  "title": "TPS54331",
  "brief": "TI 3 A step-down converter with integrated FET, SOIC-8. 3.5-28 V input, 570 kHz. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power",
    "dc-dc",
    "buck",
    "step-down",
    "switching-regulator",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "TPS54331",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management",
    "subcategory": "3 A step-down (buck) converter",
    "datasheet": "https://www.ti.com/lit/ds/symlink/tps54331.pdf",
    "parts": {
      "symbol": "tps54331.kicad_sym",
      "footprint": "tps54331.kicad_mod",
      "model_3d": "tps54331-etched.glb",
      "model_3d_plain": "tps54331.glb",
      "lbr": "tps54331.lbr",
      "model_3d_step": "tps54331-etched.step",
      "model_3d_step_plain": "tps54331.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "BOOT",
        "type": "power_out",
        "description": "Bootstrap capacitor node for the internal high-side N-channel MOSFET gate driver. A 0.1-µF ceramic capacitor is required between BOOT and PH. Absolute-max BOOT-to-GND is 38 V and BOOT-PH is 8 V; if the BOOT-PH voltage falls below the minimum, the high-side MOSFET is turned off until the bootstrap cap is refreshed."
      },
      {
        "number": "2",
        "name": "VIN",
        "type": "power_in",
        "description": "3.5-V to 28-V input supply pin. Absolute max 30 V; recommended operating range 3.5-28 V. Bypass to GND with a low-ESR ceramic capacitor placed close to the pin."
      },
      {
        "number": "3",
        "name": "EN",
        "type": "input",
        "description": "Enable input. Float to enable; pull below 1.25 V (typ enable threshold) to disable. A resistor divider from VIN to EN to GND programs the input UVLO with two resistors (uses the small hysteresis current, ~-1 µA at threshold and ~-4 µA at threshold+50 mV). Absolute-max 6 V."
      },
      {
        "number": "4",
        "name": "SS",
        "type": "input",
        "description": "Slow-start pin. An external capacitor from SS to GND sets the output voltage rise time (charge current ~2 µA at V(SS)=0.4 V). SS-to-VSENSE matching typ 10 mV. Absolute-max 3 V."
      },
      {
        "number": "5",
        "name": "VSENSE",
        "type": "input",
        "description": "Inverting input of the internal transconductance (gm) error amplifier. Connect the feedback resistor divider from the regulated output to VSENSE (reference voltage 0.8 V typ, 0.772-0.828 V). Absolute-max 3 V."
      },
      {
        "number": "6",
        "name": "COMP",
        "type": "output",
        "description": "Error-amplifier output and input to the PWM comparator. Connect the type-II frequency compensation network (typically Rc + Cc series to GND with optional high-frequency Cp) to this pin. Error-amp gm 92 µmhos, ±7 µA source/sink typ. Absolute-max 3 V."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground. Return for all internal circuitry; must be tied to system ground (and to the exposed PowerPAD on the DDA package)."
      },
      {
        "number": "8",
        "name": "PH",
        "type": "power_out",
        "description": "Switch node - source of the internal high-side power MOSFET. Connect the external inductor to PH and the freewheeling Schottky rectifier cathode to PH. Absolute-max range -0.6 V to 30 V (10-ns transients to -5 V allowed); peak sink current up to 9 A."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/tps54331.pdf",
        "pages": 41,
        "sha256": "cf72dfd0ac69eec6",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "tps54331.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tps54331-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          4.9,
          1.75
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "31f1474cb092cb2da79e35ad22d5fcbd4e0fcfa47bb97d83bcc32d2ca023e33a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Step-down (buck) converter, integrated FET",
      "Output current": "3 A",
      "Input voltage": "3.5-28 V",
      "Output voltage": "down to 0.8 V",
      "Switching frequency": "570 kHz",
      "Control": "voltage-mode, external COMP",
      "Protection": "current limit + thermal shutdown",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "tps54331",
    "3a buck converter",
    "step down converter",
    "integrated fet buck",
    "28v buck"
  ],
  "discovery_pitch": "TPS54331 3 A step-down (buck) converter with integrated FET (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
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    "tps54331.kicad_mod",
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    "tps54331.lbr",
    "docs/hero.png",
    "docs/tps54331-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tps54331-etched.step"
  ],
  "variants": [
    {
      "mpn": "TPS54331DR (SOIC-8)",
      "kind": "packaging"
    },
    {
      "mpn": "TPS54331D (SOIC-8, tube)",
      "kind": "packaging"
    }
  ]
}