A4402KLPTR-T

{
  "schema_version": 1,
  "type": "component",
  "slug": "a4402klptr-t",
  "title": "A4402KLPTR-T",
  "brief": "Allegro MicroSystems, LLC Linear Voltage Regulators (LDO), HTSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power supply chip",
    "a4402klptr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "A4402KLPTR-T",
    "manufacturer": "Allegro MicroSystems, LLC",
    "package": "HTSSOP-16",
    "pin_count": 17,
    "category": "Power Supply Chip",
    "subcategory": "Linear Voltage Regulators (LDO)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/2971762d5dcc2461a2ac310b4e850e01.pdf",
    "parts": {
      "symbol": "a4402klptr-t.kicad_sym",
      "footprint": "a4402klptr-t.kicad_mod",
      "model_3d": "a4402klptr-t-hero.glb",
      "model_3d_plain": "a4402klptr-t-etched.glb",
      "model_3d_step": "a4402klptr-t-etched.step",
      "model_3d_step_plain": "a4402klptr-t.step",
      "lbr": "a4402klptr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C2650280",
      "digikey": "620-1462-2-ND",
      "mouser": "250-A4402KLPTR-T"
    },
    "distributor_check": {
      "checked_at": "2026-10-24T05:41:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "620-1462-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "250-A4402KLPTR-T",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "TON",
        "type": "input",
        "description": "On-time setting terminal; a resistor from TON to VIN1 sets the buck converter on-time for a given input voltage."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground terminal."
      },
      {
        "number": "3",
        "name": "FB2",
        "type": "input",
        "description": "Feedback input for the linear regulator output VLIN, set by the R3/R4 divider."
      },
      {
        "number": "4",
        "name": "VIN2",
        "type": "power_in",
        "description": "Input voltage 2, which supplies the linear regulator and should be connected to the switcher output when VSW is between 3 and 5.5 V."
      },
      {
        "number": "5",
        "name": "VO2",
        "type": "power_out",
        "description": "Regulator 2 (linear regulator) output."
      },
      {
        "number": "6",
        "name": "WDI",
        "type": "input",
        "description": "Watchdog input; if the watchdog is not used it should be pulled to ground through a 4.7 kΩ resistor."
      },
      {
        "number": "7",
        "name": "TSET",
        "type": "passive",
        "description": "Soft start and watchdog timing capacitor terminal; the external capacitor on TSET sets both the soft start time and the WDI timing."
      },
      {
        "number": "8",
        "name": "NPOR",
        "type": "output",
        "description": "Fault output; open-drain power-on reset output that is pulled low on a POR event."
      },
      {
        "number": "9",
        "name": "FB1",
        "type": "input",
        "description": "Feedback input for the switching regulator output VSW, set by the R1/R2 divider."
      },
      {
        "number": "10",
        "name": "POR",
        "type": "passive",
        "description": "POR delay terminal; an external capacitor on POR sets the reset delay tPOR."
      },
      {
        "number": "11",
        "name": "ISEN",
        "type": "input",
        "description": "Current sense input that sets the switcher current limit; connect to GND through a series sense resistor RSENSE."
      },
      {
        "number": "12",
        "name": "BOOT",
        "type": "passive",
        "description": "Boot node for LX; a 0.01 µF X7R bootstrap capacitor rated at least 25 V connects between BOOT and LX."
      },
      {
        "number": "13",
        "name": "LX",
        "type": "output",
        "description": "Switching regulator output (switch node) of the buck converter."
      },
      {
        "number": "14",
        "name": "GND",
        "type": "power_in",
        "description": "Ground terminal."
      },
      {
        "number": "15",
        "name": "VIN1",
        "type": "power_in",
        "description": "Input voltage 1, the buck converter input, with supply range 6 to 50 V."
      },
      {
        "number": "16",
        "name": "ENB",
        "type": "input",
        "description": "Enable input; active high enables the device, and when set low the device enters sleep mode drawing a maximum of 1 µA."
      },
      {
        "number": "17",
        "name": "PAD",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: Package naming differs: the request says HTSSOP-16, but the datasheet names this package 16-pin eTSS; The exposed pad is printed as 'PAD' with no number on the pinout diagram and terminal list. It is in; Pin types are my KiCad-class interpretation, since the datasheet gives only functional descriptions.",
          "exposed pad 17 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 18,
        "cost_usd": 0.0835,
        "at": "2026-10-24T05:41:19"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/2971762d5dcc2461a2ac310b4e850e01.pdf",
        "pages": 18,
        "sha256": "3941d9412abe8197",
        "source_tier": "lcsc"
      },
      "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": "a4402klptr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "7982746831c0bd23f4690608869ad67776faae5c762fb0376666126a3998921b",
        "checked": "2026-10-24",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a4402klptr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "36ef2ed9a8bd70e1afe14e555b1ac28b603ca8a42c708efbc4f581b41559df65",
        "checked": "2026-10-24",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems, LLC",
      "Package": "HTSSOP-16",
      "Category": "Power Supply Chip",
      "Pins": "17"
    },
    "appearance": {
      "contacts": {
        "quote": "pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "3941d9412abe819736e45205eba7a8487f4eb4592ebd2a40dd3fa9fa83ed057f"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "3941d9412abe819736e45205eba7a8487f4eb4592ebd2a40dd3fa9fa83ed057f",
      "rows": [
        {
          "name": "Supply Quiescent Current (VENB = 5 V, IOUT = 0 mA)",
          "symbol": "IIN(Q)",
          "kind": "electrical",
          "unit": "mA",
          "min": 1,
          "typ": null,
          "max": 6,
          "conditions": "VENB = 5 V, IOUT = ISW + ILIN = 0 mA, 13.5 V < VIN1 < 50 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Supply Quiescent Current in sleep (ENB low)",
          "symbol": "IIN(Q)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "VENB = 0 V, 13.5 V < VIN1 < 18 V, IOUT = ISW + ILIN = 0 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ENB Logic Input Voltage (rising)",
          "symbol": "VENB",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": 2.28,
          "max": 2.56,
          "conditions": "VENB rising",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ENB Logic Input Current, high level",
          "symbol": "IENB",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "High input level, VENB = 3 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ENB Logic Input Current, low level",
          "symbol": "IENB",
          "kind": "electrical",
          "unit": "µA",
          "min": -2,
          "typ": null,
          "max": 2,
          "conditions": "Low input level, VENB < 0.4 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Feedback Voltage, linear regulator",
          "symbol": "VFB2",
          "kind": "electrical",
          "unit": "V",
          "min": 1.156,
          "typ": 1.18,
          "max": 1.204,
          "conditions": "1 mA < IO2 < 250 mA, 3.3 V < VIN2 < 5 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "VO2 Undervoltage Lockout Threshold",
          "symbol": "VO2UVLO",
          "kind": "electrical",
          "unit": "V",
          "min": 0.896,
          "typ": 0.944,
          "max": 0.99,
          "conditions": "VO2 rising based on FB voltage",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "VO2 Undervoltage Lockout Hysteresis",
          "symbol": "VO2UVHYS",
          "kind": "electrical",
          "unit": "mV",
          "min": 30,
          "typ": 50,
          "max": 70,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Feedback Input Bias Current, linear regulator",
          "symbol": "IFB2",
          "kind": "electrical",
          "unit": "nA",
          "min": -100,
          "typ": 100,
          "max": 400,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Current Limit, linear regulator",
          "symbol": "IO2",
          "kind": "electrical",
          "unit": "mA",
          "min": 250,
          "typ": null,
          "max": 350,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Feedback Voltage, switching regulator",
          "symbol": "VFB1",
          "kind": "electrical",
          "unit": "V",
          "min": 1.139,
          "typ": 1.18,
          "max": 1.221,
          "conditions": "IOUT = ISW + ILIN = 1 mA to 1.0 A, 8 V < VIN1 < 18 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Feedback Input Bias Current, switching regulator",
          "symbol": "IFB1",
          "kind": "electrical",
          "unit": "nA",
          "min": -400,
          "typ": -100,
          "max": 100,
          "conditions": "VIN1 = 6 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Switcher On Time",
          "symbol": "ton",
          "kind": "electrical",
          "unit": "ns",
          "min": 450,
          "typ": 640,
          "max": 830,
          "conditions": "VIN1 = 19.25 V, Rton = 750 kΩ",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Switcher On Time",
          "symbol": "ton",
          "kind": "electrical",
          "unit": "ns",
          "min": 165,
          "typ": 230,
          "max": 300,
          "conditions": "VIN1 = 13.5 V, Rton = 750 kΩ",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Switcher On Time",
          "symbol": "ton",
          "kind": "electrical",
          "unit": "ns",
          "min": 1050,
          "typ": 1480,
          "max": 1925,
          "conditions": "VIN1 = 8 V, Rton = 750 kΩ",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ton Low Voltage Threshold",
          "symbol": "VPL",
          "kind": "electrical",
          "unit": "V",
          "min": 8.1,
          "typ": 9,
          "max": 9.9,
          "conditions": "VIN1 rising",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ton High Voltage Threshold",
          "symbol": "VPH",
          "kind": "electrical",
          "unit": "V",
          "min": 15.75,
          "typ": 17.5,
          "max": 19.25,
          "conditions": "VIN1 rising",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Minimum On-Time",
          "symbol": "tonmin",
          "kind": "timing",
          "unit": "ns",
          "min": 80,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Minimum Off-Time",
          "symbol": "toffmin",
          "kind": "timing",
          "unit": "ns",
          "min": 130,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ISEN Voltage",
          "symbol": "VISEN",
          "kind": "electrical",
          "unit": "mV",
          "min": -350,
          "typ": -250,
          "max": -150,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Valley Current Limit Threshold",
          "symbol": "Ilim",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 550,
          "conditions": "6 V < VIN1 < 8 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "NPOR Output Voltage",
          "symbol": "VNPOR",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "INPOR = 1 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "NPOR Leakage Current",
          "symbol": "INPOR",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1.5,
          "conditions": "VNPOR = 5.5 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "NPOR Reset Voltage",
          "symbol": "VNPORRESET",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.7,
          "conditions": "20 kΩ pullup connected to VOUT2",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "TSET Current, Watchdog Mode",
          "symbol": "ITSETWDI",
          "kind": "electrical",
          "unit": "µA",
          "min": 7,
          "typ": 10,
          "max": 14,
          "conditions": "NPOR = high",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "WDI Frequency",
          "symbol": "fWDI",
          "kind": "timing",
          "unit": "kHz",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "WDI Duty Cycle",
          "symbol": "DCWDI",
          "kind": "timing",
          "unit": "%",
          "min": 10,
          "typ": null,
          "max": 90,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "WDI Logic Input Current",
          "symbol": "IWDI",
          "kind": "electrical",
          "unit": "µA",
          "min": -20,
          "typ": null,
          "max": 20,
          "conditions": "VWDI = 0 to 5 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "TSET Current, Soft Start Mode",
          "symbol": "ITSETSS",
          "kind": "electrical",
          "unit": "µA",
          "min": 14,
          "typ": 20,
          "max": 26,
          "conditions": "NPOR = low",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "POR Current",
          "symbol": "IPOR",
          "kind": "electrical",
          "unit": "µA",
          "min": 3.92,
          "typ": 5.6,
          "max": 7.28,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VIN1 Pin voltage",
          "symbol": "VIN1",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "VIN2 Pin voltage",
          "symbol": "VIN2",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "LX Pin voltage",
          "symbol": "VLX",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -1,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "ISEN Pin voltage",
          "symbol": "VISEN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "ENB Pin voltage",
          "symbol": "VENB",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "VO2 Pin voltage",
          "symbol": "VO2",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "WDI Pin voltage",
          "symbol": "VWDI",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "TON Pin voltage",
          "symbol": "VTON",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "FB1 and FB2 Pins voltage",
          "symbol": "VFBx",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "NPOR voltage",
          "symbol": "VNPOR",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6.5,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "TSET Pin voltage",
          "symbol": "VTSET",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "POR Pin voltage",
          "symbol": "VPOR",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Ambient Operating Temperature Range K",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "Range K",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature (max)",
          "symbol": "TJ(max)",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage range VIN1",
          "symbol": "VIN1",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 6,
          "typ": null,
          "max": 50,
          "conditions": "Valid for Temperature Range K version at TJ = –40°C to 150°C, unless otherwise noted",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Second supply range for VIN2",
          "symbol": "VIN2",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 3,
          "typ": null,
          "max": 5.5,
          "conditions": "Second supply used to power VIN2 when the switcher voltage is greater than 5 V",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Package thermal resistance, junction to ambient",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 34,
          "max": null,
          "conditions": "On 4-layer PCB based on JEDEC standard JESD51-7",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "a4402klptr-t"
  ],
  "discovery_pitch": "A4402KLPTR-T (Allegro MicroSystems, LLC) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "a4402klptr-t.kicad_sym",
    "a4402klptr-t.kicad_mod",
    "a4402klptr-t.glb",
    "a4402klptr-t.step",
    "a4402klptr-t.lbr",
    "docs/hero.png",
    "docs/a4402klptr-t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "a4402klptr-t-hero.glb",
    "a4402klptr-t-hero.overlay.json",
    "a4402klptr-t-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}