BQ27441

{
  "schema_version": 1,
  "type": "component",
  "slug": "bq27441",
  "title": "BQ27441",
  "brief": "TI single-cell Li-ion battery fuel gauge, SON-12. Impedance Track, I2C state-of-charge, no sense resistor calibration. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power",
    "fuel-gauge",
    "battery-monitor",
    "li-ion",
    "son-12",
    "texas-instruments"
  ],
  "component": {
    "mpn": "BQ27441",
    "manufacturer": "Texas Instruments",
    "package": "SON-12",
    "pin_count": 12,
    "category": "Power Management",
    "subcategory": "Battery fuel gauge",
    "datasheet": "https://www.ti.com/lit/ds/symlink/bq27441-g1.pdf",
    "parts": {
      "symbol": "bq27441.kicad_sym",
      "footprint": "bq27441.kicad_mod",
      "model_3d": "bq27441-etched.glb",
      "model_3d_plain": "bq27441.glb",
      "model_3d_step": "bq27441-etched.step",
      "model_3d_step_plain": "bq27441.step",
      "lbr": "bq27441.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Slave I2C serial data. Open-drain; requires an external ~10-kΩ pull-up to VDD (typical). If external pull-ups can be disconnected during normal operation, add a 1-MΩ pull-down to VSS to avoid floating inputs."
      },
      {
        "number": "2",
        "name": "SCL",
        "type": "bidirectional",
        "description": "Slave I2C serial clock from system master. Open-drain; requires an external ~10-kΩ pull-up to VDD. Add a 1-MΩ pull-down to VSS if external pull-ups can be disconnected."
      },
      {
        "number": "3",
        "name": "VSS",
        "type": "power_in",
        "description": "Device ground (0 V) reference pin."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. May be left floating or tied to VSS."
      },
      {
        "number": "5",
        "name": "VDD",
        "type": "power_out",
        "description": "1.8-V internal LDO regulator output. Decouple with a 0.47-µF ceramic capacitor to VSS. Not intended to power other devices in the system."
      },
      {
        "number": "6",
        "name": "BAT",
        "type": "power_in",
        "description": "LDO regulator input and battery voltage measurement input (analog). Kelvin sense connect to the positive battery terminal (PACKP). Decouple with a 1-µF capacitor to VSS placed close to the gauge."
      },
      {
        "number": "7",
        "name": "SRN",
        "type": "input",
        "description": "Coulomb-counter differential input (negative). High-side connection expecting an external 10-mΩ, 1% sense resistor. Kelvin sense connect to the opposite side of the sense resistor from SRP (positive connection to system VSYS)."
      },
      {
        "number": "8",
        "name": "SRP",
        "type": "input",
        "description": "Coulomb-counter differential input (positive). Kelvin sense connect SRP to the positive battery-terminal (PACKP) side of the external 10-mΩ sense resistor."
      },
      {
        "number": "9",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. May be left floating or tied to VSS."
      },
      {
        "number": "10",
        "name": "BIN",
        "type": "input",
        "description": "Battery insertion detection digital input. With OpConfig [BI_PU_EN]=1 (default) a logic low indicates battery insertion. For removable packs, connect BIN to VSS through a pack thermistor (typ. 10-kΩ) with an internal-side 1.8-MΩ pull-up to VDD; for embedded batteries use a 10-kΩ pull-down to VSS. Must connect only to VDD and not an external rail; never short directly to VCC or VSS."
      },
      {
        "number": "11",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. May be left floating or tied to VSS."
      },
      {
        "number": "12",
        "name": "GPOUT",
        "type": "output",
        "description": "Open-drain multipurpose output. Configurable via OpConfig [BATLOWEN]: when set, indicates BAT_LOW; when cleared (default), acts as SOC interrupt (SOC_INT) pulsed on events such as SOC changes. Requires an external 10-kΩ pull-up; do not leave floating. Recommended to route to a host-MCU GPIO so the host can wake the gauge from shutdown."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/bq27441-g1.pdf",
        "pages": 28,
        "sha256": "8779b67adfe7683f",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 12,
        "described": 12,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "bq27441.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          4.0,
          2.5,
          0.92
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0f2ebd625419df73cf30a423e911544c75466aaa0167546130e6debd8d875605",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bq27441-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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          2.5,
          0.92
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "917bb826565370dc317608700bf4331d67e5d5d1e68b01acfdbedeb8345b08bb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Single-cell Li-ion fuel gauge",
      "Algorithm": "Impedance Track",
      "Reports": "State of charge, remaining capacity, voltage, temperature",
      "Interface": "I2C",
      "Alert": "GPOUT (SOC / low-battery)",
      "Supply": "2.45-4.5 V (from battery)",
      "Package": "SON-12"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bq27441",
    "battery fuel gauge",
    "state of charge ic",
    "li-ion gas gauge"
  ],
  "discovery_pitch": "TI BQ27441 single-cell Li-ion fuel gauge (SON-12) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "bq27441.kicad_sym",
    "bq27441.kicad_mod",
    "bq27441.glb",
    "bq27441.step",
    "bq27441.lbr",
    "docs/hero.png",
    "docs/bq27441-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bq27441-etched.step"
  ]
}