LT3844EFE#PBF

{
  "slug": "lt3844efe-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",
    "lt3844efe#pbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lt3844efe-pbf.kicad_sym",
    "lt3844efe-pbf.kicad_mod",
    "lt3844efe-pbf.glb",
    "lt3844efe-pbf.step",
    "lt3844efe-pbf.lbr",
    "docs/hero.png",
    "docs/lt3844efe-pbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lt3844efe-pbf-hero.glb",
    "lt3844efe-pbf-hero.overlay.json",
    "lt3844efe-pbf-etched.glb"
  ],
  "component": {
    "mpn": "LT3844EFE#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/3844fc.pdf",
    "parts": {
      "symbol": "lt3844efe-pbf.kicad_sym",
      "footprint": "lt3844efe-pbf.kicad_mod",
      "model_3d": "lt3844efe-pbf-hero.glb",
      "model_3d_plain": "lt3844efe-pbf-etched.glb",
      "model_3d_step": "lt3844efe-pbf-etched.step",
      "model_3d_step_plain": "lt3844efe-pbf.step",
      "lbr": "lt3844efe-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C671629",
      "digikey": "505-LT3844EFE#PBF-ND",
      "mouser": "584-LT3844EFE#PBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-31T03:50:20Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-LT3844EFE#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT3844EFE#PBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "VIN is the main supply pin with an operating voltage range of 4V to 60V and should be decoupled to SGND with a low ESR capacitor located close to the pin."
      },
      {
        "number": "2",
        "name": "SHDN",
        "type": "input",
        "description": "SHDN has a precision enable threshold of 1.35V (rising) with 120mV of hysteresis, pulling it below a transistor VBE (0.7V) enters shutdown, and the pin is internally clamped to 6V with typical input bias current below 10µA."
      },
      {
        "number": "3",
        "name": "CSS",
        "type": "passive",
        "description": "CSS programs the soft-start function using CSS = 2µA(tSS/1.231V) for a given output voltage slew rate, and should be left unconnected when soft-start is not used."
      },
      {
        "number": "4",
        "name": "BURST_EN",
        "type": "input",
        "description": "BURST_EN must be connected to ground to enable Burst Mode operation and connected to VFB or VCC to disable it."
      },
      {
        "number": "5",
        "name": "VFB",
        "type": "input",
        "description": "VFB is the output voltage feedback input, connected to the supply output through a resistive divider, feeds the inverting input of the error amplifier, and regulates at 1.231V."
      },
      {
        "number": "6",
        "name": "VC",
        "type": "passive",
        "description": "VC is the error amplifier output (peak switch current command) that is typically compensated with an RC network to SGND, is clamped 100mV below the burst threshold when Burst Mode is enabled, cannot be pulled low by a low impedance source, and should be driven through a 1k series resistance if externally manipulated."
      },
      {
        "number": "7",
        "name": "SYNC",
        "type": "input",
        "description": "SYNC is the external clock input for oscillator synchronization, with RSET set so the internal oscillator runs 10% to 25% below the external clock frequency, and should be connected to SGND if unused."
      },
      {
        "number": "8",
        "name": "fSET",
        "type": "passive",
        "description": "fSET programs the oscillator frequency with an external resistor RSET, which is required even when an external sync clock is supplied."
      },
      {
        "number": "9",
        "name": "SGND",
        "type": "power_in",
        "description": "SGND is the low noise ground reference that should be connected to the -VOUT side of the output capacitors, with high currents kept away from this connection."
      },
      {
        "number": "10",
        "name": "SENSE–",
        "type": "input",
        "description": "SENSE- is the negative input of the current sense amplifier, connected to the VOUT side of the sense resistor in step-down applications, with the sensed inductor current limit set to 100mV across the SENSE inputs."
      },
      {
        "number": "11",
        "name": "SENSE+",
        "type": "input",
        "description": "SENSE+ is the positive input of the current sense amplifier, connected to the inductor side of the sense resistor in step-down applications, with the sensed inductor current limit set to 100mV across the SENSE inputs."
      },
      {
        "number": "12",
        "name": "PGND",
        "type": "power_in",
        "description": "PGND is the high current ground reference for the internal low side switch and VCC regulator and must be connected directly to the negative terminal of the VCC decoupling capacitor."
      },
      {
        "number": "13",
        "name": "VCC",
        "type": "power_out",
        "description": "VCC is the internal bias supply decoupling node that requires a low ESR 1µF or greater ceramic capacitor to PGND, may be back-driven from an external DC source to improve efficiency, and sinks 20µA in shutdown until discharged to 0V."
      },
      {
        "number": "14",
        "name": "SW",
        "type": "passive",
        "description": "SW is connected to the cathode of the external clamping Schottky diode, the power MOSFET drain and the inductor, and swings from VIN during the on-time to a Schottky voltage drop below ground during the off-time."
      },
      {
        "number": "15",
        "name": "TG",
        "type": "output",
        "description": "TG is the bootstrapped gate drive for the top N-Channel MOSFET and should be connected to the MOSFET gate with a short and wide PCB trace to minimize inductance."
      },
      {
        "number": "16",
        "name": "BOOST",
        "type": "power_in",
        "description": "BOOST supplies the bootstrapped gate drive, is referenced to SW through a low ESR ceramic boost capacitor (recommended 50 times the top MOSFET total input capacitance, 0.1µF adequate in most applications), and sees a maximum of VIN + VCC ground referred."
      },
      {
        "number": "17",
        "name": "SGND (Exposed Pad)",
        "type": "power_in",
        "description": "The exposed pad is internally connected to SGND and must be soldered to the PCB ground for electrical contact and optimal 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 17 is the exposed thermal pad (SGND), which is internally tied to pin 9; it is listed here as pi; The datasheet does not give an explicit ERC class for the pins; the types are assigned from their de"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0555,
        "at": "2026-10-31T03:50:05"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/3844fc.pdf",
        "pages": 26,
        "sha256": "ce6947436197972c",
        "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": "lt3844efe-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": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lt3844efe-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": "93f1322deaa2289f815f218f719efa9c5ee246bb7d2d9229ec8d9b7cb6543865",
        "checked": "2026-10-31",
        "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": "lt3844efe-pbf.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}