LT3991IMSE#PBF

{
  "slug": "lt3991imse-pbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices DC-DC Converters, MSOP-10-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "lt3991imse#pbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
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    "path": "docs/hero.png"
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    "README.md",
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    "lt3991imse-pbf.kicad_mod",
    "lt3991imse-pbf.glb",
    "lt3991imse-pbf.step",
    "lt3991imse-pbf.lbr",
    "docs/hero.png",
    "docs/lt3991imse-pbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lt3991imse-pbf-hero.glb",
    "lt3991imse-pbf-hero.overlay.json",
    "lt3991imse-pbf-etched.glb"
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  "component": {
    "mpn": "LT3991IMSE#PBF",
    "manufacturer": "Analog Devices",
    "package": "MSOP-10-EP",
    "pin_count": 11,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/3991fa.pdf",
    "parts": {
      "symbol": "lt3991imse-pbf.kicad_sym",
      "footprint": "lt3991imse-pbf.kicad_mod",
      "model_3d": "lt3991imse-pbf-hero.glb",
      "model_3d_plain": "lt3991imse-pbf-etched.glb",
      "model_3d_step": "lt3991imse-pbf-etched.step",
      "model_3d_step_plain": "lt3991imse-pbf.step",
      "lbr": "lt3991imse-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C671885",
      "digikey": "LT3991IMSE#PBF-ND",
      "mouser": "584-LT3991IMSE#PBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T15:46:26Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LT3991IMSE#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT3991IMSE#PBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BD",
        "type": "passive",
        "description": "Connects to the anode of the boost diode and is normally connected to the output."
      },
      {
        "number": "2",
        "name": "BOOST",
        "type": "power_in",
        "description": "Provides a drive voltage higher than the input voltage to the internal bipolar NPN power switch, with BOOST pin voltage rated to 75V absolute maximum and no more than 30V above the SW pin."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "output",
        "description": "Output of the internal power switch that connects to the inductor, catch diode, and boost capacitor."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "Supplies current to the internal circuitry and internal power switch over a 4.3V to 55V input range, with an absolute maximum of 55V, and must be locally bypassed."
      },
      {
        "number": "5",
        "name": "EN",
        "type": "input",
        "description": "Shuts the part down when low and enables it when high, with a hysteretic threshold of 1.005V rising and 0.975V falling and an absolute maximum of 55V."
      },
      {
        "number": "6",
        "name": "FB",
        "type": "input",
        "description": "Regulates to 1.19V and receives the feedback resistor divider tap, with a phase lead capacitor (typically 10pF) connected between FB and VOUT and a 6V absolute maximum."
      },
      {
        "number": "7",
        "name": "SS",
        "type": "passive",
        "description": "A capacitor and series resistor tied to ground ramp up the peak current limit at start-up, with a typical soft-start resistor of 100k, and floating this pin disables soft-start."
      },
      {
        "number": "8",
        "name": "RT",
        "type": "passive",
        "description": "A resistor tied between RT and ground sets the switching frequency."
      },
      {
        "number": "9",
        "name": "PG",
        "type": "output",
        "description": "Open-drain power good output that stays low until the FB pin is within 9% of the final regulation voltage, with a 30V absolute maximum voltage rating."
      },
      {
        "number": "10",
        "name": "SYNC",
        "type": "input",
        "description": "External clock synchronization input; grounding it selects low ripple Burst Mode operation at low output loads, and its absolute maximum voltage is 6V."
      },
      {
        "number": "11",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; the exposed pad must be soldered to the PCB."
      }
    ],
    "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 datasheet shows two MSE top-view drawings: one labels pin 6 as FB (LT3991 adjustable) and the ot"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0153,
        "at": "2026-10-28T15:46:07"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/3991fa.pdf",
        "pages": 24,
        "sha256": "05394db5ad4d382a",
        "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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      "footprint": "viewers/footprint.html"
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        "role": "plain",
        "up": "Z",
        "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": "18605eed706df7bb9674107abe7aa36e0ba163a09c21a2cee6c75cfa291b7937",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lt3991imse-pbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "sha256": "5ca12082830cbbc06bbdb9c83a30104dcdeb6ec21bed2703144552d89891aa59",
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  }
}