LM51581QRTERQ1

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  "type": "component",
  "slug": "lm51581qrterq1",
  "title": "LM51581QRTERQ1",
  "brief": "Texas Instruments DC-DC Converters, WQFN-16(3x3). 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 management (pmic)",
    "lm51581qrterq1",
    "factory-2.0.0",
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  "component": {
    "mpn": "LM51581QRTERQ1",
    "manufacturer": "Texas Instruments",
    "package": "WQFN-16(3x3)",
    "pin_count": 17,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm5158-q1",
    "parts": {
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      "lbr": "lm51581qrterq1.lbr"
    },
    "distributor_links": {
      "lcsc": 3188437,
      "digikey": "296-LM51581QRTERQ1TR-ND",
      "mouser": "595-LM51581QRTERQ1"
    },
    "distributor_check": {
      "checked_at": "2026-10-03T07:23:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-LM51581QRTERQ1TR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-LM51581QRTERQ1",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin; source connection of the internal N-channel power MOSFET."
      },
      {
        "number": "2",
        "name": "VCC",
        "type": "power_out",
        "description": "Output of the internal VCC regulator and supply voltage input of the internal MOSFET driver; connect 1-µF ceramic bypass capacitor from this pin to PGND."
      },
      {
        "number": "3",
        "name": "BIAS",
        "type": "power_in",
        "description": "Supply voltage input to the VCC regulator; operating range 3.2V to 60V absolute maximum 65V; connect bypass capacitor from this pin to PGND."
      },
      {
        "number": "4",
        "name": "PGOOD",
        "type": "tri_state",
        "description": "Power-good indicator; open-drain output which goes low if FB is below the undervoltage threshold (VUVTH); connect pullup resistor to system voltage rail."
      },
      {
        "number": "5",
        "name": "RT",
        "type": "input",
        "description": "Switching frequency setting pin; switching frequency is programmed by a single resistor between RT and AGND in the range 100 kHz to 2.2 MHz."
      },
      {
        "number": "6",
        "name": "EN/UVLO/SYNC",
        "type": "input",
        "description": "Enable/UVLO/synchronization pin; enables converter (>VEN threshold), programs undervoltage lockout via resistive voltage divider, and accepts external negative pulse for clock synchronization."
      },
      {
        "number": "7",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground pin; connect to the analog ground plane through a wide and short path."
      },
      {
        "number": "8",
        "name": "COMP",
        "type": "output",
        "description": "Output of the internal transconductance error amplifier; connect loop compensation components between this pin and AGND."
      },
      {
        "number": "9",
        "name": "FB",
        "type": "input",
        "description": "Inverting input of the error amplifier; connect voltage divider to set output voltage in boost, SEPIC, or primary-side regulated flyback topologies; input range 0V to 4.0V."
      },
      {
        "number": "10",
        "name": "SS",
        "type": "input",
        "description": "Soft-start time programming pin; external capacitor and internal current source set the ramp rate of the internal error amplifier reference during soft start."
      },
      {
        "number": "11",
        "name": "MODE",
        "type": "input",
        "description": "Mode configuration pin; setting controls hiccup mode protection and spread spectrum features via voltage level (0V, 370mV, 620mV, or >1V) or resistor to AGND."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal electrical contact."
      },
      {
        "number": "13",
        "name": "SW",
        "type": "output",
        "description": "Switch pin; drain connection of the internal N-channel power MOSFET; 85V absolute maximum rating, 5-ns transient minimum -6V."
      },
      {
        "number": "14",
        "name": "SW",
        "type": "output",
        "description": "Switch pin; drain connection of the internal N-channel power MOSFET; 85V absolute maximum rating, 5-ns transient minimum -6V."
      },
      {
        "number": "15",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal electrical contact."
      },
      {
        "number": "16",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin; source connection of the internal N-channel power MOSFET."
      },
      {
        "number": "17",
        "name": "EP",
        "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-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "exposed pad 17 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0952,
        "at": "2026-10-03T07:23:21"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm5158-q1",
        "pages": 45,
        "sha256": "c10929600ea42a9c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 17,
        "described": 17,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "WQFN-16(3x3)",
      "Category": "Power Management (PMIC)",
      "Pins": "17"
    }
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  "discovery_pitch": "LM51581QRTERQ1 (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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