LT3845AEFE#PBF

{
  "slug": "lt3845aefe-pbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices DC-DC Converters, TSSOP-16-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "lt3845aefe#pbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lt3845aefe-pbf.kicad_sym",
    "lt3845aefe-pbf.kicad_mod",
    "lt3845aefe-pbf.glb",
    "lt3845aefe-pbf.step",
    "lt3845aefe-pbf.lbr",
    "docs/hero.png",
    "docs/lt3845aefe-pbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lt3845aefe-pbf-hero.glb",
    "lt3845aefe-pbf-hero.overlay.json",
    "lt3845aefe-pbf-etched.glb"
  ],
  "component": {
    "mpn": "LT3845AEFE#PBF",
    "manufacturer": "Analog Devices",
    "package": "TSSOP-16-EP",
    "pin_count": 17,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/3845afa.pdf",
    "parts": {
      "symbol": "lt3845aefe-pbf.kicad_sym",
      "footprint": "lt3845aefe-pbf.kicad_mod",
      "model_3d": "lt3845aefe-pbf-hero.glb",
      "model_3d_plain": "lt3845aefe-pbf-etched.glb",
      "model_3d_step": "lt3845aefe-pbf-etched.step",
      "model_3d_step_plain": "lt3845aefe-pbf.step",
      "lbr": "lt3845aefe-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C671633",
      "digikey": "505-LT3845AEFE#PBF-ND",
      "mouser": "584-LT3845AEFE#PBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-29T03:58:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-LT3845AEFE#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT3845AEFE#PBF",
        "status": "found",
        "lifecycle": "Restricted Availability"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Main supply pin, to be decoupled to SGND with a low ESR capacitor of at least 0.1µF located close to the pin; absolute maximum VIN is 65V and the operating range is 4V to 60V."
      },
      {
        "number": "2",
        "name": "SHDN",
        "type": "input",
        "description": "Precision enable pin with a 1.35V rising threshold and 120mV hysteresis for UVLO; pulling it below 0.7V enters low-current shutdown, the pin is clamped to 6V, and its voltage rating is 5V with 1mA maximum pin current."
      },
      {
        "number": "3",
        "name": "CSS",
        "type": "passive",
        "description": "Soft-start capacitor pin, where CSS = 2µA(tSS/1.231V) sets the output voltage slew rate; leave unconnected when soft-start is not used, and the voltage rating is 5V."
      },
      {
        "number": "4",
        "name": "BURST_EN",
        "type": "input",
        "description": "Burst Mode enable pin where below 0.5V enables Burst Mode and reverse-current inhibit, above 0.5V disables Burst Mode, and reverse-current inhibit is disabled above 2.5V; the pin is rated 24V."
      },
      {
        "number": "5",
        "name": "VFB",
        "type": "input",
        "description": "Output voltage feedback input connected to the supply output through a resistive divider, regulating at 1.231V, with a voltage rating of 5V."
      },
      {
        "number": "6",
        "name": "VC",
        "type": "passive",
        "description": "Error amplifier output that sets the peak switch current and must not be pulled low by a low impedance source; if externally manipulated it must be driven through a 1kΩ series resistance, and the voltage rating is 5V."
      },
      {
        "number": "7",
        "name": "SYNC",
        "type": "input",
        "description": "External clock input for oscillator synchronization, with RSET set so the internal oscillator runs 10% to 25% below the external clock within a 100kHz to 600kHz sync range; connect to SGND if unused, and the voltage rating is 5V."
      },
      {
        "number": "8",
        "name": "fSET",
        "type": "passive",
        "description": "Oscillator frequency programming pin set by external resistor RSET, which is required even when an external sync clock is supplied; the programmable range is 100kHz to 500kHz."
      },
      {
        "number": "9",
        "name": "SENSE–",
        "type": "input",
        "description": "Negative input of the current sense amplifier, connected to the VOUT side of the sense resistor in step-down applications; the pin is rated 40V and the differential sense voltage is limited to ±1V."
      },
      {
        "number": "10",
        "name": "SENSE+",
        "type": "input",
        "description": "Positive input of the current sense amplifier, connected to the inductor side of the sense resistor in step-down applications; the pin is rated 40V."
      },
      {
        "number": "11",
        "name": "PGND",
        "type": "power_in",
        "description": "High-current ground reference for the internal low-side switch driver and VCC regulator, to be connected directly to the negative terminal of the VCC decoupling capacitor."
      },
      {
        "number": "12",
        "name": "BG",
        "type": "output",
        "description": "Gate drive for the bottom N-channel MOSFET, to be routed with a short and wide trace (typically 0.02 in) to minimize inductance."
      },
      {
        "number": "13",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal bias supply decoupling node that requires a low ESR ceramic capacitor of 1µF or greater to PGND; the absolute maximum rating is 24V."
      },
      {
        "number": "14",
        "name": "SW",
        "type": "passive",
        "description": "Reference for the VBOOST supply and high-current return for the bootstrapped switch; the switch voltage rating is 65V to -2V."
      },
      {
        "number": "15",
        "name": "TG",
        "type": "output",
        "description": "Bootstrapped gate drive for the top N-channel MOSFET, to be routed with a short and wide trace (typically 0.02 in) to minimize inductance."
      },
      {
        "number": "16",
        "name": "BOOST",
        "type": "power_out",
        "description": "Bootstrap supply for the gate drive, connected to a low ESR ceramic boost capacitor referenced to SW (0.1µF is typical); the maximum voltage seen is VIN + VCC, the BOOST-to-SW differential is limited to 24V, and the absolute maximum is 80V."
      },
      {
        "number": "17",
        "name": "SGND",
        "type": "power_in",
        "description": "Exposed pad internally connected to the SGND low noise ground reference, which should be connected to the -VOUT side of the output capacitors and soldered to the PCB ground for thermal performance."
      }
    ],
    "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: Pin types for CSS, VC, fSET and SW are judgment calls (passive) because the datasheet does not class; The text gives VCC absolute maximum 24V and an operating minimum of 8V, but the operating maximum is; Pin 17 is the exposed thermal pad (SGND), not a numbered lead; included as printed on the package dr",
          "4/17 pins cited to the wrong page (name found elsewhere): ['13:VCC@p8', '14:SW@p8', '15:TG@p8', '17:SGND@p8']"
        ],
        "pages_sent": 7,
        "cost_usd": 0.054,
        "at": "2026-10-29T03:57:59"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/3845afa.pdf",
        "pages": 26,
        "sha256": "6a4adebeb2ba3740",
        "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": "lt3845aefe-pbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "7982746831c0bd23f4690608869ad67776faae5c762fb0376666126a3998921b",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lt3845aefe-pbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "fba2cfb55d113a131ad0aa817038b23139cc50158436a0e874d09265faa65a3b",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "FE16 (BC)",
      "source_page": 24,
      "D": {
        "nom_mm": 5.0,
        "range_mm": [
          4.9,
          5.1
        ]
      },
      "E1": {
        "nom_mm": 4.4,
        "range_mm": [
          4.3,
          4.5
        ]
      },
      "E": {
        "nom_mm": 6.4,
        "range_mm": [
          null,
          null
        ]
      },
      "e": {
        "nom_mm": 0.65,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.1,
        "range_mm": [
          null,
          1.1
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "lt3845aefe-pbf.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}