LT3905EUD#TRPBF

{
  "slug": "lt3905eud-trpbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices DC-DC Converters, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "lt3905eud#trpbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lt3905eud-trpbf.kicad_sym",
    "lt3905eud-trpbf.kicad_mod",
    "lt3905eud-trpbf.glb",
    "lt3905eud-trpbf.step",
    "lt3905eud-trpbf.lbr",
    "docs/hero.png",
    "docs/lt3905eud-trpbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lt3905eud-trpbf-hero.glb",
    "lt3905eud-trpbf-hero.overlay.json",
    "lt3905eud-trpbf-etched.glb"
  ],
  "component": {
    "mpn": "LT3905EUD#TRPBF",
    "manufacturer": "Analog Devices",
    "package": "QFN-16-EP(3x3)",
    "pin_count": 17,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/3905fa.pdf",
    "parts": {
      "symbol": "lt3905eud-trpbf.kicad_sym",
      "footprint": "lt3905eud-trpbf.kicad_mod",
      "model_3d": "lt3905eud-trpbf-hero.glb",
      "model_3d_plain": "lt3905eud-trpbf-etched.glb",
      "model_3d_step": "lt3905eud-trpbf-etched.step",
      "model_3d_step_plain": "lt3905eud-trpbf.step",
      "lbr": "lt3905eud-trpbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C671644",
      "digikey": "161-LT3905EUD#TRPBFTR-ND",
      "mouser": "584-LT3905EUD#TRPBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T21:04:45Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "161-LT3905EUD#TRPBFTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT3905EUD#TRPBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "ILIM",
        "type": "output",
        "description": "Open-drain overload indicator that pulls low when ILIM_MON reaches the 1.348V threshold and releases when ILIM_MON drops by 50mV; max recommended sink current is 2mA, leave open if unused."
      },
      {
        "number": "2",
        "name": "LOS_MON",
        "type": "output",
        "description": "Loss-of-signal monitor that sources 10% of the APD current, is the positive input of the LOS comparator, is clamped to 2.25V, and needs a resistor to GND (tie to GND if unused)."
      },
      {
        "number": "3",
        "name": "ILIM_MON",
        "type": "output",
        "description": "APD overload monitor that sources 5% of the APD current, is clamped to 2.25V, needs a resistor to GND to set gain, with a 1.248V regulation setpoint and 1.348V current-limit threshold; must not float (tie to GND if unused)."
      },
      {
        "number": "4",
        "name": "MON",
        "type": "output",
        "description": "Current monitor output that sources 20% of the APD current, clamped to 2.25V, with a resistor to GND setting the monitor gain."
      },
      {
        "number": "5",
        "name": "APD",
        "type": "output",
        "description": "APD cathode connection; the maximum current of this pin is 7mA (typ)."
      },
      {
        "number": "6",
        "name": "MONIN",
        "type": "power_in",
        "description": "Power supply for the APD and all current monitors, connected to VOUT through an external lowpass filter for lowest noise (65V absolute maximum)."
      },
      {
        "number": "7",
        "name": "SW",
        "type": "passive",
        "description": "Switch pin, drain of the internal power FET and anode of the internal Schottky, connected to the switching side of the inductor with minimal trace length (65V absolute maximum)."
      },
      {
        "number": "8",
        "name": "VOUT",
        "type": "power_out",
        "description": "Boost converter output, cathode of the internal power Schottky, with an output smoothing capacitor to GND (65V absolute maximum)."
      },
      {
        "number": "9",
        "name": "GND",
        "type": "power_in",
        "description": "Ground, tied to the exposed pad."
      },
      {
        "number": "10",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply pin for 2.7V to 12V operation, bypassed with a capacitor to GND as close to the IC as possible."
      },
      {
        "number": "11",
        "name": "EN/UVLO",
        "type": "input",
        "description": "Master enable and VIN undervoltage lockout with 1.2V threshold, 25mV internal hysteresis and 3µA hysteresis current; shutdown current is <1µA when low, or drive with a digital signal above 1.5V."
      },
      {
        "number": "12",
        "name": "CTRL",
        "type": "input",
        "description": "External reference input to the FB error amp when below 1.248V; tie to VIN if unused."
      },
      {
        "number": "13",
        "name": "LOS",
        "type": "output",
        "description": "Open-drain loss-of-signal indicator that goes high when LOS_MON is below LOS_ADJ; max recommended sink current is 2mA, leave open if unused."
      },
      {
        "number": "14",
        "name": "LOS_ADJ",
        "type": "input",
        "description": "External reference input for the loss-of-signal comparator with 20mV internal hysteresis; tie to VIN for a fixed 1.248V threshold or if unused."
      },
      {
        "number": "15",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin connected to a resistor divider between VOUT and GND with a 1.248V internal reference; pull above 1.8V to disable the step-up converter."
      },
      {
        "number": "16",
        "name": "fSEL",
        "type": "input",
        "description": "Frequency selector: tie to VIN for 2MHz operation or to GND for 1MHz operation."
      },
      {
        "number": "17",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed pad, ground, must be soldered to a large PCB copper area for proper functionality and heat sinking."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin 3 ILIM_MON clamp and ILIM release hysteresis differ within the datasheet (pin text says 50mV rel"
        ],
        "pages_sent": 18,
        "cost_usd": 0.1799,
        "at": "2026-10-30T21:04:37"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/3905fa.pdf",
        "pages": 18,
        "sha256": "17d3a9e9e9c939b5",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 17,
        "described": 17,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lt3905eud-trpbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.0,
          3.0,
          0.785
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3eb81ffac423a66cdcfead8efe56401da171edaf1f2257049aad7b2d3900f6c8",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lt3905eud-trpbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.0,
          3.0,
          0.785
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4b372a8d4c8fad2b6ad27cff9129aa2abc3dae5067db8d0e1d6c71e82b723b5f",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "UD16",
      "source_page": 16,
      "D": {
        "nom_mm": 3.0,
        "range_mm": [
          null,
          null
        ]
      },
      "E1": {
        "nom_mm": 3.0,
        "range_mm": [
          null,
          null
        ]
      },
      "e": {
        "nom_mm": 0.5,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 0.7,
        "range_mm": [
          null,
          null
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "lt3905eud-trpbf.step",
        "verdict": "PASS",
        "reasons": [
          "height within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}