LGS5504

{
  "slug": "lgs5504",
  "version": "0.1.0",
  "type": "component",
  "description": "Legend-Si Battery Management ICs, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management",
    "lgs5504",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lgs5504.kicad_sym",
    "lgs5504.kicad_mod",
    "lgs5504.glb",
    "lgs5504.step",
    "lgs5504.lbr",
    "docs/hero.png",
    "docs/lgs5504-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lgs5504-hero.glb",
    "lgs5504-hero.overlay.json",
    "lgs5504-etched.glb"
  ],
  "component": {
    "mpn": "LGS5504",
    "manufacturer": "Legend-Si",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "Power Management",
    "subcategory": "Battery Management ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a50cf2a57e6063d4b26697d03c27f4b2.pdf",
    "parts": {
      "symbol": "lgs5504.kicad_sym",
      "footprint": "lgs5504.kicad_mod",
      "model_3d": "lgs5504-hero.glb",
      "model_3d_plain": "lgs5504-etched.glb",
      "model_3d_step": "lgs5504-etched.step",
      "model_3d_step_plain": "lgs5504.step",
      "lbr": "lgs5504.lbr"
    },
    "distributor_links": {
      "lcsc": "C20618059"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T01:09:00Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "LED",
        "type": "output",
        "description": "Charge status indicator output for an LED (680R series resistor suggested in the application notes), with the LED blinking at 1Hz in one of the states."
      },
      {
        "number": "2",
        "name": "BST",
        "type": "passive",
        "description": "Bootstrap pin; connect a 100nF capacitor (CBST) between BST and SW, with a -0.3V to 6V limit relative to SW."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "passive",
        "description": "Switching node of the boost converter, connected to the inductor (2.2uH) and the CBST capacitor, with a 5A current rating."
      },
      {
        "number": "4",
        "name": "VOUT",
        "type": "passive",
        "description": "Boost converter output; decouple to GND with a capacitor placed close to the pin, with absolute maximum -0.3V to 28V."
      },
      {
        "number": "5",
        "name": "BAT",
        "type": "bidirectional",
        "description": "Battery connection; the charger regulates 16.8V constant-voltage on the LGS5504, with absolute maximum -0.3V to 28V."
      },
      {
        "number": "6",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal LDO output (10.6V to 11.6V on the LGS5504) that biases the NTC network and needs a decoupling capacitor to GND, with absolute maximum -0.3V to 6V per the table."
      },
      {
        "number": "7",
        "name": "VIN",
        "type": "power_in",
        "description": "Power input (3.0V to 12.3V operating on the LGS5504), with absolute maximum -0.3V to 28V and a 10uF input capacitor."
      },
      {
        "number": "8",
        "name": "NTC",
        "type": "input",
        "description": "Battery temperature sense input; connect an NTC thermistor with resistor divider to VCC (R1=28K, R2=10K for the 5V USB option)."
      },
      {
        "number": "9",
        "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: Datasheet text is heavily garbled because the Chinese text was lost. Descriptions of pin functions a; Page 4 pin table says VOUT uses 20uF and VCC uses 2.2uF to GND, but pages 2-3 give CVOUT=10uF, CVCC=; The abs-max row 'GND NTC,VCC -0.3V~6V' conflicts with the VCC voltage of 10.6-11.6V for the LGS5504 "
        ],
        "pages_sent": 16,
        "cost_usd": 0.0918,
        "at": "2026-10-22T01:08:03"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/a50cf2a57e6063d4b26697d03c27f4b2.pdf",
        "pages": 16,
        "sha256": "4a315848881349be",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lgs5504.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lgs5504-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "bc91a9825273e615e1bfe56b338841e3631840023fc44a88f8814412552346f5",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}