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Ray Set visibility: public 0ef9f5c 14d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "lm51571qrterq1",
  "title": "LM51571QRTERQ1",
  "brief": "TEXAS INSTRUMENTS Global Sourcing Parts, 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",
    "global sourcing parts",
    "lm51571qrterq1",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LM51571QRTERQ1",
    "manufacturer": "TEXAS INSTRUMENTS",
    "package": "WQFN-16(3x3)",
    "pin_count": 17,
    "category": "Global Sourcing Parts",
    "subcategory": "Global Sourcing Parts",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm51571-q1",
    "parts": {
      "symbol": "lm51571qrterq1.kicad_sym",
      "footprint": "lm51571qrterq1.kicad_mod",
      "model_3d": "lm51571qrterq1-hero.glb",
      "model_3d_plain": "lm51571qrterq1-etched.glb",
      "model_3d_step": "lm51571qrterq1-etched.step",
      "model_3d_step_plain": "lm51571qrterq1.step",
      "lbr": "lm51571qrterq1.lbr"
    },
    "distributor_links": {
      "lcsc": "C3188436",
      "digikey": "296-LM51571QRTERQ1TR-ND",
      "mouser": "595-LM51571QRTERQ1"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T12:35:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-LM51571QRTERQ1TR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-LM51571QRTERQ1",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin and 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 input of the internal MOSFET driver; connect a 5-Ω resistor in series with a 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 (2.9 V to 45 V recommended, 50 V abs max); connect a bypass capacitor from this pin to PGND."
      },
      {
        "number": "4",
        "name": "PGOOD",
        "type": "output",
        "description": "Open-drain power-good indicator that goes low if FB is below the undervoltage threshold (VUVTH); connect a pullup resistor to the system voltage rail."
      },
      {
        "number": "5",
        "name": "RT",
        "type": "input",
        "description": "Switching frequency setting pin, programmed by a single resistor between RT and AGND."
      },
      {
        "number": "6",
        "name": "UVLO/SYNC/EN",
        "type": "input",
        "description": "Enable, programmable line UVLO divider input and external synchronization clock input (negative pulse); converter shuts down below the enable threshold (VEN), must not be left floating, and connects to BIAS if not used."
      },
      {
        "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 the loop compensation components between this pin and AGND."
      },
      {
        "number": "9",
        "name": "FB",
        "type": "input",
        "description": "Inverting input of the error amplifier; connect a voltage divider to set the output voltage, with the low-side resistor close to AGND."
      },
      {
        "number": "10",
        "name": "SS",
        "type": "input",
        "description": "Soft-start time programming pin; an external capacitor and an internal current source set the reference ramp rate, with the capacitor ground connected to AGND."
      },
      {
        "number": "11",
        "name": "MODE",
        "type": "input",
        "description": "Selects hiccup mode protection and spread spectrum at initial power up: 0 V disables both, 370 mV (37.4 kΩ) enables both, 620 mV (62.0 kΩ) hiccup only, >1 V (100 kΩ) spread spectrum only."
      },
      {
        "number": "12",
        "name": "SW",
        "type": "passive",
        "description": "Switch pin, drain connection of the internal N-channel power MOSFET."
      },
      {
        "number": "13",
        "name": "SW",
        "type": "passive",
        "description": "Switch pin, drain connection of the internal N-channel power MOSFET."
      },
      {
        "number": "14",
        "name": "SW",
        "type": "passive",
        "description": "Switch pin, drain connection of the internal N-channel power MOSFET."
      },
      {
        "number": "15",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal electrical contact; optionally connect to PGND for improved thermal conductivity."
      },
      {
        "number": "16",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin and 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-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet gives no pin number for the exposed pad (printed as '—'), so 'EP' is used. Its type is; The datasheet doesn't state an electrical type for SW. 'passive' is inferred from its role as the dr; The datasheet type is P (power). 'power_out' is inferred because VCC is the regulator output."
        ],
        "pages_sent": 10,
        "cost_usd": 0.1068,
        "at": "2026-10-23T12:35:33"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm51571-q1",
        "pages": 49,
        "sha256": "b17edbd026370cbb",
        "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": "lm51571qrterq1.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3,
          3,
          0.785
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3eb81ffac423a66cdcfead8efe56401da171edaf1f2257049aad7b2d3900f6c8",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm51571qrterq1-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3,
          3,
          0.785
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "672e0635a879db2b2e671719efba7fafd8576946370030c5669c92a538145a0f",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "TEXAS INSTRUMENTS",
      "Package": "WQFN-16(3x3)",
      "Category": "Global Sourcing Parts",
      "Pins": "17"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "b17edbd026370cbb85afd5553279ae60c4eddd9eb02f16985c74505c813bf015",
      "rows": [
        {
          "name": "BIAS shutdown current",
          "symbol": "ISHUTDOWN(BIAS)",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 2.6,
          "max": 5,
          "conditions": "VBIAS = 12 V, VUVLO = 0 V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "BIAS operating current",
          "symbol": "IOPERATING(BIAS)",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 700,
          "max": 775,
          "conditions": "VBIAS = 12 V, VUVLO = 2.0 V, VFB = VREF, RT = 220 kΩ",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "VCC regulation",
          "symbol": "VVCC-REG",
          "kind": "electrical",
          "unit": "V",
          "min": 4.66,
          "typ": 4.9,
          "max": 5.14,
          "conditions": "VBIAS = 8 V, IVCC = 18 mA",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "VCC UVLO threshold",
          "symbol": "VVCC-UVLO(RISING)",
          "kind": "electrical",
          "unit": "V",
          "min": 2.75,
          "typ": 2.8,
          "max": 2.85,
          "conditions": "VCC rising",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Enable threshold rising",
          "symbol": "VEN(RISING)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.4,
          "typ": 0.52,
          "max": 0.7,
          "conditions": "EN rising",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Enable threshold falling",
          "symbol": "VEN(FALLING)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.33,
          "typ": 0.49,
          "max": 0.63,
          "conditions": "EN falling",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "UVLO threshold rising",
          "symbol": "VUVLO(RISING)",
          "kind": "electrical",
          "unit": "V",
          "min": 1.425,
          "typ": 1.5,
          "max": 1.575,
          "conditions": "UVLO rising",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "UVLO threshold falling",
          "symbol": "VUVLO(FALLING)",
          "kind": "electrical",
          "unit": "V",
          "min": 1.37,
          "typ": 1.45,
          "max": 1.52,
          "conditions": "UVLO falling",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "UVLO hysteresis current",
          "symbol": "IUVLO",
          "kind": "electrical",
          "unit": "μA",
          "min": 4,
          "typ": 5,
          "max": 6,
          "conditions": "VUVLO = 1.6 V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Soft-start current",
          "symbol": "ISS",
          "kind": "electrical",
          "unit": "μA",
          "min": 9,
          "typ": 10,
          "max": 11,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Switching frequency 1",
          "symbol": "fsw1",
          "kind": "electrical",
          "unit": "kHz",
          "min": 85,
          "typ": 100,
          "max": 115,
          "conditions": "RT = 220 kΩ",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Switching frequency 2",
          "symbol": "fsw2",
          "kind": "electrical",
          "unit": "kHz",
          "min": 388,
          "typ": 440,
          "max": 492,
          "conditions": "RT = 49.3 kΩ",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Switching frequency 3",
          "symbol": "fsw3",
          "kind": "electrical",
          "unit": "kHz",
          "min": 1980,
          "typ": 2200,
          "max": 2420,
          "conditions": "RT = 9.09 kΩ",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Maximum duty cycle limit 1",
          "symbol": "DMAX1",
          "kind": "electrical",
          "unit": "%",
          "min": 80,
          "typ": 85,
          "max": 90,
          "conditions": "RT = 9.09 kΩ",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Maximum duty cycle limit 2",
          "symbol": "DMAX2",
          "kind": "electrical",
          "unit": "%",
          "min": 90,
          "typ": 93,
          "max": 96,
          "conditions": "RT = 220 kΩ",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Internal MOSFET current limit LM51571",
          "symbol": "ILIM",
          "kind": "electrical",
          "unit": "A",
          "min": 4.33,
          "typ": 5,
          "max": 5.67,
          "conditions": "LM51571",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "FB reference",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 0.99,
          "typ": 1,
          "max": 1.01,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "COMP clamp voltage rising",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 2.5,
          "max": 2.8,
          "conditions": "COMP rising (VUVLO = 2.0 V)",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "COMP clamp voltage falling",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1,
          "max": 1.1,
          "conditions": "COMP falling",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Overvoltage threshold rising",
          "symbol": "VOVTH",
          "kind": "electrical",
          "unit": "%",
          "min": 107,
          "typ": 110,
          "max": 113,
          "conditions": "FB rising (reference to VREF)",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "PGOOD pulldown RDSON",
          "symbol": "",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 70,
          "conditions": "1 mA sinking",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Undervoltage threshold falling",
          "symbol": "VUVTH",
          "kind": "electrical",
          "unit": "%",
          "min": 87,
          "typ": 90,
          "max": 93,
          "conditions": "FB falling (reference to VREF)",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "MOSFET on-resistance",
          "symbol": "rDS(ON)",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": 45,
          "max": 90,
          "conditions": "VBIAS = 12 V",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "MOSFET on-resistance",
          "symbol": "rDS(ON)",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": 47,
          "max": 95,
          "conditions": "VBIAS = 3.5 V",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Switch leakage current",
          "symbol": "",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 1200,
          "conditions": "VSW = 12 V",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Thermal shutdown threshold",
          "symbol": "TTSD",
          "kind": "electrical",
          "unit": "°C",
          "min": null,
          "typ": 175,
          "max": null,
          "conditions": "Temperature rising",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "BIAS to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "UVLO to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "max VBIAS + 0.3",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "SS, RT to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 3.8,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "FB to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 4,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "MODE to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 3.8,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "PGND to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 0.3,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "VCC to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.8,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "PGOOD to AGND",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 18,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "SW to AGND (DC)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "SW to AGND transient",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -4,
          "typ": null,
          "max": null,
          "conditions": "6 ns transient",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
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