LT3973EDD#TRPBF

{
  "schema_version": 1,
  "type": "component",
  "slug": "lt3973edd-trpbf",
  "title": "LT3973EDD#TRPBF",
  "brief": "Analog Devices DC-DC Converters, DFN-10-EP(3x3). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "lt3973edd#trpbf"
  ],
  "component": {
    "mpn": "LT3973EDD#TRPBF",
    "manufacturer": "Analog Devices",
    "package": "DFN-10-EP(3x3)",
    "pin_count": 11,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588914472979746816",
    "parts": {
      "symbol": "lt3973edd-trpbf.kicad_sym",
      "footprint": "lt3973edd-trpbf.kicad_mod",
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      "model_3d_plain": "lt3973edd-trpbf.glb",
      "model_3d_step": "lt3973edd-trpbf-etched.step",
      "model_3d_step_plain": "lt3973edd-trpbf.step",
      "lbr": "lt3973edd-trpbf.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin for the adjustable LT3973. The internal error amplifier regulates FB to 1.21V; connect the tap of the external resistor divider from VOUT to GND here. FB bias current is typically 0.1nA (20nA max)."
      },
      {
        "number": "2",
        "name": "OUT",
        "type": "power_in",
        "description": "Output-sense pin used by the LT3973 to regulate the VIN-to-VOUT voltage during dropout conditions and to draw current for charging the boost capacitor. Connect to the regulated output; if the programmed output is greater than 14V, tie this pin to GND. Absolute max 14V."
      },
      {
        "number": "3",
        "name": "EN/UVLO",
        "type": "input",
        "description": "Enable / undervoltage-lockout input. The part is in shutdown when this pin is low and active when high; the internal threshold is 1.19V rising with 30mV hysteresis (accurate only when VIN ≥ 4.2V). Tie to VIN if the shutdown feature is unused, or ground to force shutdown. Absolute max 42V."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "Main supply input, 4.2V to 42V operating (42V absolute max). VIN supplies the internal circuitry and the internal power switch. Must be locally bypassed with a low-ESR ceramic capacitor."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Must be tied together with the exposed pad (pin 11) on the PCB. Serves as the return for VIN, EN/UVLO, and internal circuitry."
      },
      {
        "number": "6",
        "name": "SW",
        "type": "output",
        "description": "Switch node - output of the internal high-side NPN power switch and drain of the integrated catch Schottky. Connect this pin to the external inductor. Sees VIN plus a diode drop during off-time; internal catch-diode current limit is typically 1.15A."
      },
      {
        "number": "7",
        "name": "BOOST",
        "type": "passive",
        "description": "Bootstrap pin used to generate a drive voltage higher than VIN for the internal NPN power switch. A ceramic boost capacitor (typ. 0.47µF) is connected from BOOST to SW. Absolute max 55V (25V above SW)."
      },
      {
        "number": "8",
        "name": "BD",
        "type": "power_in",
        "description": "Boost-diode anode. Connect through the boost capacitor charging path - this pin drives the anode of the internal boost Schottky and also supplies current to the LT3973's internal regulator whenever BD is above 3.2V. Absolute max 25V."
      },
      {
        "number": "9",
        "name": "PG",
        "type": "output",
        "description": "Power-good open-drain output from an internal comparator. PG remains low until FB is within 10% of the final regulation voltage; it is valid once VIN > 4.2V and EN/UVLO is high. Sink capability typ. 350µA at 0.4V; leakage 0.01µA at 3V. Add an external pull-up resistor."
      },
      {
        "number": "10",
        "name": "RT",
        "type": "passive",
        "description": "Switching-frequency programming pin. Connect an external resistor from RT to GND to program the oscillator between 200kHz and 2.2MHz (e.g. 41.2k → 2.15MHz, 158k → 790kHz, 768k → 195kHz)."
      },
      {
        "number": "11",
        "name": "GND (Exposed Pad)",
        "type": "power_in",
        "description": "Exposed thermal pad on the underside of the DFN package. Electrically GND - must be soldered to the PCB ground plane for proper electrical and thermal performance (θJA = 40°C/W for the DD package)."
      }
    ],
    "provenance": {
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        "pages": 24,
        "sha256": "8b84083bfbac6278",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 11,
        "described": 11,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "lt3973edd-trpbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3.0,
          2.98,
          0.77
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
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        "checked": "2026-10-07",
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      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Analog Devices",
      "Package": "DFN-10-EP(3x3)",
      "Category": "Power Management (PMIC)",
      "Pins": "11"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
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          "name": "Minimum Input Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 3.8,
          "typ": null,
          "max": 4.2,
          "conditions": "",
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        },
        {
          "name": "Quiescent Current from VIN",
          "symbol": "",
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          "unit": "µA",
          "min": null,
          "typ": 0.75,
          "max": 1.3,
          "conditions": "VEN/UVLO Low",
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        {
          "name": "Quiescent Current from VIN",
          "symbol": "",
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          "name": "Quiescent Current from VIN",
          "symbol": "",
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          "conditions": "VEN/UVLO High, –40°C to 125°C",
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        {
          "name": "LT3973 Feedback Voltage",
          "symbol": "",
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          "unit": "V",
          "min": 1.195,
          "typ": 1.21,
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        {
          "name": "LT3973 Feedback Voltage",
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        },
        {
          "name": "LT3973 FB Pin Bias Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "nA",
          "min": 0.1,
          "typ": null,
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          "conditions": "VFB = 1.21V",
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        },
        {
          "name": "FB/Output Voltage Line Regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "%/V",
          "min": null,
          "typ": 0.0002,
          "max": 0.01,
          "conditions": "4.2V < VIN < 40V",
          "source_page": 3,
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        },
        {
          "name": "Switching Frequency",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1.72,
          "typ": 2.15,
          "max": 2.58,
          "conditions": "RT = 41.2k, VIN = 6V",
          "source_page": 3,
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        },
        {
          "name": "Switching Frequency",
          "symbol": "",
          "kind": "electrical",
          "unit": "kHz",
          "min": 632,
          "typ": 790,
          "max": 948,
          "conditions": "RT = 158k, VIN = 6V",
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        },
        {
          "name": "Switching Frequency",
          "symbol": "",
          "kind": "electrical",
          "unit": "kHz",
          "min": 156,
          "typ": 195,
          "max": 234,
          "conditions": "RT = 768k, VIN = 6V",
          "source_page": 3,
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        },
        {
          "name": "Switch Current Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": 1.237,
          "typ": 1.65,
          "max": 1.98,
          "conditions": "VIN = 5V, VFB = 0V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Catch Schottky Current Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": 0.92,
          "typ": 1.15,
          "max": 1.44,
          "conditions": "VIN = 5V",
          "source_page": 3,
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        },
        {
          "name": "Switch VCESAT",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 250,
          "conditions": "ISW = 500mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Switch Leakage Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.05,
          "max": 2,
          "conditions": "",
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        },
        {
          "name": "Catch Schottky Forward Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 550,
          "conditions": "ISCH = 200mA, VIN = VBD = NC",
          "source_page": 3,
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        },
        {
          "name": "Catch Schottky Reverse Leakage",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.05,
          "max": 2,
          "conditions": "VSW = 12V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Boost Schottky Forward Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 820,
          "conditions": "ISCH = 50mA, VIN = NC, VBOOST = 0V",
          "source_page": 3,
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        {
          "name": "Boost Schottky Reverse Leakage",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.02,
          "max": 2,
          "conditions": "VREVERSE = 12V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Minimum Boost Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.4,
          "typ": null,
          "max": 1.8,
          "conditions": "VIN = 5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "BOOST Pin Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 10,
          "max": 13,
          "conditions": "ISW = 500mA, VBOOST = 15V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Dropout Comparator Threshold (VIN - OUT)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": 400,
          "typ": 490,
          "max": 580,
          "conditions": "Falling, VIN = 5V",
          "source_page": 3,
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        {
          "name": "Dropout Comparator Hysteresis",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 40,
          "max": null,
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        },
        {
          "name": "EN/UVLO Pin Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 1,
          "max": 30,
          "conditions": "VEN/UVLO = 12V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN/UVLO Voltage Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.09,
          "typ": 1.16,
          "max": 1.23,
          "conditions": "EN/UVLO Falling, VIN ≥ 4.2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN/UVLO Voltage Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.12,
          "typ": 1.19,
          "max": 1.28,
          "conditions": "EN/UVLO Rising, VIN ≥ 4.2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN/UVLO Voltage Hysteresis",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 30,
          "max": 45,
          "conditions": "",
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        },
        {
          "name": "PG Threshold Offset from Feedback Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": 6.5,
          "typ": 10,
          "max": 13.5,
          "conditions": "VFB Rising",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "PG Hysteresis as % of Output Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.8,
          "max": null,
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        },
        {
          "name": "PG Leakage",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "VPG = 3V",
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          "source": "datasheet"
        },
        {
          "name": "PG Sink Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": 220,
          "typ": null,
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          "conditions": "VPG = 0.4V",
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        {
          "name": "Minimum Switch On-Time",
          "symbol": "",
          "kind": "timing",
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          "min": null,
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          "name": "Minimum Switch Off-Time",
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          "min": null,
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          "max": 180,
          "conditions": "VIN = 10V",
          "source_page": 4,
          "source": "datasheet"
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          "name": "BOOST Pin Above SW Pin",
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        {
          "name": "FB/VOUT, RT, PG Voltage",
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          "name": "BD Voltage",
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          "name": "Storage Temperature Range",
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          "min": -65,
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        {
          "name": "Operating Junction Temperature Range (E grade)",
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          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "LT3973E",
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        {
          "name": "Junction-to-Ambient Thermal Resistance (θJA)",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C/W",
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          "name": "Junction-to-Case Thermal Resistance (θJC)",
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