FM4258

{
  "slug": "fm4258",
  "version": "0.1.0",
  "type": "component",
  "description": "Shenzhen Fuman Battery Management, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "fm4258",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "fm4258.kicad_sym",
    "fm4258.kicad_mod",
    "fm4258.glb",
    "fm4258.step",
    "fm4258.lbr",
    "docs/hero.png",
    "docs/fm4258-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "fm4258-hero.glb",
    "fm4258-hero.overlay.json",
    "fm4258-etched.glb"
  ],
  "component": {
    "mpn": "FM4258",
    "manufacturer": "Shenzhen Fuman",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "Power Management (PMIC)",
    "subcategory": "Battery Management",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590907097900916736",
    "parts": {
      "symbol": "fm4258.kicad_sym",
      "footprint": "fm4258.kicad_mod",
      "model_3d": "fm4258-hero.glb",
      "model_3d_plain": "fm4258-etched.glb",
      "model_3d_step": "fm4258-etched.step",
      "model_3d_step_plain": "fm4258.step",
      "lbr": "fm4258.lbr"
    },
    "distributor_links": {
      "lcsc": "C19630717"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T22:48:15Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Chip supply input, with a recommended range of 4.6 V to 5.5 V, an operating range of 3.6 V to 7.0 V, and an absolute maximum of 8.0 V with no signal applied."
      },
      {
        "number": "2",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground, which must be connected together with the power ground PGND."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "input",
        "description": "Switch node connected to the inductor; the trace should be kept as short as possible to reduce EMI."
      },
      {
        "number": "4",
        "name": "VBS",
        "type": "power_out",
        "description": "Boost converter output, with the C5 capacitor placed close to this pin in the typical application circuit."
      },
      {
        "number": "5",
        "name": "BAT",
        "type": "power_in",
        "description": "Battery positive connection; the float charge voltage is 8.5 V (8.45 V to 8.55 V) and the battery overvoltage protection voltage is 8.90 V."
      },
      {
        "number": "6",
        "name": "ISET",
        "type": "input",
        "description": "Charge current control pin; a resistor from ISET to GND sets the constant-current charge level, with the ISET constant-current clamp voltage at 1 V."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "Multiplexed VIN voltage detection and shutdown pin; EN below 1.2 V limits the charge current through the adaptive input loop, and EN below 0.3 V shuts the chip down."
      },
      {
        "number": "8",
        "name": "LED",
        "type": "output",
        "description": "Charge status indicator output, which stays on during charging, turns off when charging is complete, and blinks at 1 Hz on input/output overvoltage, output undervoltage or short circuit, over-temperature, or no battery."
      },
      {
        "number": "9",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground on the exposed thermal pad, which must be soldered reliably and connected to a large copper ground area for heat dissipation."
      }
    ],
    "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: The pinout table lists nine entries; pin 9 PGND is the exposed substrate heatsink pad of the ESOP-8 ; The datasheet classifies SW as 'input' (开关节点); it is a switching node driven by the internal power s; The datasheet gives no separate pinout for the ESOP-8 package beyond the single pin table on page 2;"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0464,
        "at": "2026-10-17T22:46:04"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590907097900916736",
        "pages": 7,
        "sha256": "b9034b1f641e3aa1",
        "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": "fm4258.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": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "fm4258-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": "d42fb154af5ae1eb1da5ccea09fbc65cc9de07ae8aa0de071492157807c652a8",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}