LT3973EDD-3.3#PBF

{
  "slug": "lt3973edd-3-3-pbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices DC-DC Converters, DFN-10-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "lt3973edd-3.3#pbf",
    "factory-2.0.0",
    "extractor-text"
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  "dependencies": {},
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    "path": "docs/hero.png"
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    "lt3973edd-3-3-pbf.glb",
    "lt3973edd-3-3-pbf.step",
    "lt3973edd-3-3-pbf.lbr",
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    "docs/lt3973edd-3-3-pbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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    "lt3973edd-3-3-pbf-hero.overlay.json",
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  "component": {
    "mpn": "LT3973EDD-3.3#PBF",
    "manufacturer": "Analog Devices",
    "package": "DFN-10-EP(3x3)",
    "pin_count": 11,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/3973fb.pdf",
    "parts": {
      "symbol": "lt3973edd-3-3-pbf.kicad_sym",
      "footprint": "lt3973edd-3-3-pbf.kicad_mod",
      "model_3d": "lt3973edd-3-3-pbf-hero.glb",
      "model_3d_plain": "lt3973edd-3-3-pbf-etched.glb",
      "model_3d_step": "lt3973edd-3-3-pbf-etched.step",
      "model_3d_step_plain": "lt3973edd-3-3-pbf.step",
      "lbr": "lt3973edd-3-3-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C671798",
      "digikey": "LT3973EDD-3.3#PBF-ND",
      "mouser": "584-LT3973EDD-3.3PBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T22:43:04Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LT3973EDD-3.3#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT3973EDD-3.3PBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VOUT",
        "type": "input",
        "description": "For the LT3973-3.3 this pin is VOUT, which the internal feedback divider regulates to 3.3V and which connects to the fixed-output feedback divider."
      },
      {
        "number": "2",
        "name": "OUT",
        "type": "input",
        "description": "OUT supplies dropout regulation between VIN and VOUT and pulls current to charge the boost capacitor, and must be tied to the output, or to GND if the programmed output is greater than 14V."
      },
      {
        "number": "3",
        "name": "EN/UVLO",
        "type": "input",
        "description": "The part is in shutdown when EN/UVLO is low and active when high, with a threshold of 1.19V rising and 30mV hysteresis, and it is accurate only when VIN is above 4.2V."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "VIN supplies the internal circuitry and power switch, must be locally bypassed, and has an absolute maximum of 42V."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "GND is the ground reference pin and must be connected to the exposed pad, which must be soldered to the PCB."
      },
      {
        "number": "6",
        "name": "SW",
        "type": "output",
        "description": "SW is the output of the internal power switch and connects to the inductor."
      },
      {
        "number": "7",
        "name": "BOOST",
        "type": "passive",
        "description": "BOOST provides a drive voltage higher than VIN to the internal NPN power switch and is limited to 55V absolute maximum."
      },
      {
        "number": "8",
        "name": "BD",
        "type": "power_in",
        "description": "BD connects to the anode of the boost diode, supplies the internal regulator when above 3.2V, and has an absolute maximum of 25V."
      },
      {
        "number": "9",
        "name": "PG",
        "type": "output",
        "description": "PG is the open-drain power good output that stays low until FB/VOUT is within 10% of the regulation voltage and is valid when VIN is above 4.2V and EN/UVLO is high."
      },
      {
        "number": "10",
        "name": "RT",
        "type": "passive",
        "description": "A resistor from RT to ground sets the switching frequency, with the oscillator range stated as 200kHz to 2.2MHz."
      },
      {
        "number": "11",
        "name": "GND",
        "type": "power_in",
        "description": "The exposed pad is ground and must be soldered to the PCB for thermal and electrical connection."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The DD (3mm x 3mm DFN) top-view figure text is scrambled in the extract, so the DD pin numbering was"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0194,
        "at": "2026-10-30T22:42:54"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/3973fb.pdf",
        "pages": 24,
        "sha256": "8b84083bfbac6278",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 11,
        "described": 11,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "738e2eb45860c11759f8e4f44ab26932b7c15e4d5d6c8c9ac22ae866a3e38711",
        "checked": "2026-10-30",
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}