FS4054A

{
  "schema_version": 1,
  "type": "component",
  "slug": "fs4054a",
  "title": "FS4054A",
  "brief": "FOSAN Battery Management, SOT-23-5L. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "fs4054a"
  ],
  "component": {
    "mpn": "FS4054A",
    "manufacturer": "FOSAN",
    "package": "SOT-23-5L",
    "pin_count": 5,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2201121800_FOSAN-FS4054A_C2936840.pdf",
    "parts": {
      "symbol": "fs4054a.kicad_sym",
      "footprint": "fs4054a.kicad_mod",
      "model_3d": "fs4054a-etched.glb",
      "model_3d_plain": "fs4054a.glb",
      "model_3d_step": "fs4054a-etched.step",
      "model_3d_step_plain": "fs4054a.step",
      "lbr": "fs4054a.lbr"
    },
    "distributor_links": {
      "lcsc": "C2936840"
    },
    "pins": [
      {
        "number": "1",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain charge status indicator. Pulls low (sinks current, typically driving an LED to VCC through a series resistor such as 330 Ω) while charging is in progress; goes to high impedance when charging terminates (C/10) or the part is in shutdown/standby. Absolute max voltage 7 V."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference for all internal circuitry and the external PROG resistor return."
      },
      {
        "number": "3",
        "name": "BAT",
        "type": "power_out",
        "description": "Charge current output to the single-cell Li-ion battery. Regulates to the 4.2 V float voltage in CV mode and delivers up to 500 mA in CC mode. Sources <=2 uA leakage from the battery when VCC is removed. Absolute max 7 V; continuous short-circuit safe. Typically decoupled with ~10 uF to GND."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Input supply, 4.5-5.5 V nominal (absolute max 7 V), commonly driven from a USB port or 5 V DC adapter. Undervoltage lockout threshold ~3.4 V; supply current is typically 170 uA during charge and <=25 uA in standby. Decouple with ~1 uF to GND."
      },
      {
        "number": "5",
        "name": "PROG",
        "type": "input",
        "description": "Charge current programming pin. Connect a resistor R_PROG from PROG to GND to set the constant-current charge level per I_BAT (mA) = 1000 / R_PROG (kΩ); e.g. 2 kΩ → 500 mA, 10 kΩ → 100 mA. Servos to ~1.03 V in CC mode; can also be used to monitor the actual charge current. Absolute max VCC+0.3 V, 800 uA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2201121800_FOSAN-FS4054A_C2936840.pdf",
        "pages": 5,
        "sha256": "42d795be437a7d9c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-5@sha256:455a3f7c3e5eb5b8",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "fs4054a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "fs4054a-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "0ccf168cac1cb1508cd86797fedf80627cb2e9cd44e1d92b00482beb88370427",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "FOSAN",
      "Package": "SOT-23-5L",
      "Category": "PMIC",
      "Pins": "5"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "fs4054a"
  ],
  "discovery_pitch": "FS4054A (FOSAN) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "fs4054a.kicad_sym",
    "fs4054a.kicad_mod",
    "fs4054a.glb",
    "fs4054a.step",
    "fs4054a-etched.step",
    "fs4054a.lbr",
    "docs/hero.png",
    "docs/fs4054a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "FS4054A",
      "kind": "packaging"
    },
    {
      "mpn": "FS4054B",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T20:46:51.945Z"
}