LM3405AXMK

{
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  "type": "component",
  "slug": "lm3405axmk",
  "title": "LM3405AXMK",
  "brief": "Texas Instruments LED Drivers, TSOT-23-6L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "LM3405AXMK",
    "manufacturer": "Texas Instruments",
    "package": "TSOT-23-6L",
    "pin_count": 6,
    "category": "LED Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm3405a",
    "parts": {
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      "footprint": "lm3405axmk.kicad_mod",
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      "lbr": "lm3405axmk.lbr"
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    "distributor_links": {
      "lcsc": "C701827"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T06:54:07Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
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      "mouser": {
        "pn": null,
        "status": "no match"
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    },
    "pins": [
      {
        "number": "1",
        "name": "BOOST",
        "type": "output",
        "description": "Boost voltage that drives the NMOS output switch, with a bootstrap capacitor connected between the BOOST and SW pins."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Signal and power ground pin; the bottom resistor of the feedback network should be placed as close as possible to this pin."
      },
      {
        "number": "3",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin; connect FB to the LED string cathode and an external resistor to ground to set the LED current (0.205-V reference per the datasheet description)."
      },
      {
        "number": "4",
        "name": "EN/DIM",
        "type": "input",
        "description": "Enable control input where logic high enables operation and a periodic PWM square wave sets LED brightness; do not let this pin float or exceed VIN + 0.3 V."
      },
      {
        "number": "5",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply voltage with a 3 V to 22 V operating range; connect a bypass capacitor locally from this pin to GND."
      },
      {
        "number": "6",
        "name": "SW",
        "type": "output",
        "description": "Switch pin that connects to the inductor, catch diode, and bootstrap capacitor."
      }
    ],
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          "extractor flagged: The ordering addendum (page 27) lists LM3405AXMK/NOPB as SOT-23-THIN (DDC), 6 pins, which matches th; The datasheet pin-function table gives VIN and FB the type 'I' and BOOST and SW the type 'O'. These ; Top-view ball/pin position drawing is an image not present in the extracted text, so physical pin po"
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        "at": "2026-10-18T06:53:29"
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        "pages": 37,
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 6,
        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "centre_offset_mm": 0,
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSOT-23-6L",
      "Category": "LED Drivers",
      "Pins": "6"
    },
    "characteristics": {
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          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 0.188,
          "typ": 0.205,
          "max": 0.22,
          "conditions": "",
          "source_page": 5,
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        },
        {
          "name": "Feedback input bias current",
          "symbol": "IFB",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 10,
          "max": 250,
          "conditions": "Sink/source",
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        {
          "name": "Undervoltage lockout",
          "symbol": "UVLO",
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        {
          "name": "Undervoltage lockout",
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          "max": 2.3,
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        },
        {
          "name": "Switching frequency",
          "symbol": "fSW",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1.2,
          "typ": 1.6,
          "max": 1.9,
          "conditions": "",
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        },
        {
          "name": "Maximum duty cycle",
          "symbol": "DMAX",
          "kind": "electrical",
          "unit": "%",
          "min": 85,
          "typ": 94,
          "max": null,
          "conditions": "VFB = 0 V",
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        {
          "name": "Switch ON resistance (SOT package)",
          "symbol": "RDS(ON)",
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          "unit": "mΩ",
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          "name": "Switch current limit",
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          "unit": "A",
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          "name": "Quiescent current (switching)",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.8,
          "max": 2.8,
          "conditions": "Switching, VFB = 0.195 V",
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        {
          "name": "Enable threshold voltage",
          "symbol": "VEN/DIM_TH",
          "kind": "electrical",
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          "min": 1.8,
          "typ": null,
          "max": null,
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        {
          "name": "Shutdown threshold voltage",
          "symbol": "VEN/DIM_TH",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
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          "source_page": 5,
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        },
        {
          "name": "Input supply voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 24,
          "conditions": "",
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        },
        {
          "name": "SW voltage",
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        {
          "name": "Boost voltage",
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        {
          "name": "Boost to SW voltage",
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          "name": "FB voltage",
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          "name": "Storage temperature",
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        {
          "name": "VIN input voltage",
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          "min": 0,
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          "name": "Boost to SW voltage",
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        {
          "name": "LED current",
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          "name": "Junction-to-ambient thermal resistance",
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          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
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          "conditions": "SOT (DDC) package",
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        {
          "name": "Junction-to-case (top) thermal resistance",
          "symbol": "RθJC(top)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 53.4,
          "max": null,
          "conditions": "SOT (DDC) package",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-board thermal resistance",
          "symbol": "RθJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 28.1,
          "max": null,
          "conditions": "SOT (DDC) package",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-top characterization parameter",
          "symbol": "ψJT",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 1.2,
          "max": null,
          "conditions": "SOT (DDC) package",
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        {
          "name": "Junction-to-board characterization parameter",
          "symbol": "ψJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 27.7,
          "max": null,
          "conditions": "SOT (DDC) package",
          "source_page": 5,
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