BQ25731RSNR

{
  "slug": "bq25731rsnr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Battery Management, QFN-32(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "bq25731rsnr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
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    "bq25731rsnr.step",
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    "docs/bq25731rsnr-datasheet.pdf",
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  "component": {
    "mpn": "BQ25731RSNR",
    "manufacturer": "Texas Instruments",
    "package": "QFN-32(4x4)",
    "pin_count": 33,
    "category": "Power Management (PMIC)",
    "subcategory": "Battery Management",
    "datasheet": "https://www.ti.com/cn/lit/ds/symlink/bq25731.pdf",
    "parts": {
      "symbol": "bq25731rsnr.kicad_sym",
      "footprint": "bq25731rsnr.kicad_mod",
      "model_3d": "bq25731rsnr-hero.glb",
      "model_3d_plain": "bq25731rsnr-etched.glb",
      "model_3d_step": "bq25731rsnr-etched.step",
      "model_3d_step_plain": "bq25731rsnr.step",
      "lbr": "bq25731rsnr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2871872"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T11:07:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VBUS",
        "type": "power_in",
        "description": "Charger input voltage; an input low-pass filter of 1 Ω and 0.47 µF (minimum) is recommended."
      },
      {
        "number": "2",
        "name": "ACN",
        "type": "input",
        "description": "Input current sense amplifier negative input whose leakage is matched to ACP, requiring an RC low-pass filter between the sense resistor and the pin to suppress high-frequency noise."
      },
      {
        "number": "3",
        "name": "ACP",
        "type": "input",
        "description": "Input current sense amplifier positive input whose leakage is matched to ACN, requiring an RC low-pass filter between the sense resistor and the pin to suppress high-frequency noise."
      },
      {
        "number": "4",
        "name": "CHRG_OK",
        "type": "output",
        "description": "Open-drain active-high indicator that goes HIGH after a 50-ms deglitch when VBUS is between 3.5 V and 25.8 V, requires a 10-kΩ pull-up, and goes LOW when VBUS is below 3.2 V or above 26.8 V or on listed faults."
      },
      {
        "number": "5",
        "name": "OTG/VAP/FRS",
        "type": "input",
        "description": "Active-high pin that enables OTG mode when OTG_VAP_MODE=1b and EN_OTG=1b, or FRS forward-operation mode when OTG_VAP_MODE=1b and EN_FRS=1b."
      },
      {
        "number": "6",
        "name": "ILIM_HIZ",
        "type": "input",
        "description": "Input current limit setting pin driven by a resistor divider from VDDA, where V(ILIM_HIZ) = 1 V + 40 × IDPM × Rac; below 0.4 V the device enters HIZ mode and above 0.8 V it exits HIZ mode."
      },
      {
        "number": "7",
        "name": "VDDA",
        "type": "power_in",
        "description": "Internal reference bias pin; connect a 10-Ω resistor from REGN to VDDA and a 1-µF ceramic capacitor from VDDA to power ground."
      },
      {
        "number": "8",
        "name": "IADPT",
        "type": "output",
        "description": "Adapter current monitor output with VIADPT = 20 or 40 × (VACP - VACN), clamped below 3.3 V, also used to program the inductance through a resistor to ground and decoupled by 100 pF or less."
      },
      {
        "number": "9",
        "name": "IBAT",
        "type": "output",
        "description": "Battery current monitor output with VIBAT = 8 or 16 × (VSRP - VSRN) for charge current, clamped below 3.3 V, with 100 pF or less decoupling and may be left floating if unused."
      },
      {
        "number": "10",
        "name": "PSYS",
        "type": "output",
        "description": "Current-mode system power monitor whose output is proportional to total adapter and battery power, with output voltage clamped at 3.3 V and a parallel filter capacitor recommended."
      },
      {
        "number": "11",
        "name": "PROCHOT",
        "type": "output",
        "description": "Active-low open-drain output that pulses when a monitored adapter current, battery discharge current, or system voltage event triggers, with minimum pulse width set by PROCHOT_WIDTH."
      },
      {
        "number": "12",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C open-drain data I/O that requires a 10-kΩ pull-up resistor according to I2C specifications."
      },
      {
        "number": "13",
        "name": "SCL",
        "type": "input",
        "description": "I2C clock input connected to the host controller or smart battery clock line, requiring a 10-kΩ pull-up resistor according to specifications."
      },
      {
        "number": "14",
        "name": "CMPIN",
        "type": "input",
        "description": "Input of the independent comparator compared against an internal reference; with CMP_POL=1b a resistor between CMPIN and CMPOUT sets hysteresis, with CMP_POL=0b internal hysteresis is 100 mV, and the pin should be tied to ground if unused."
      },
      {
        "number": "15",
        "name": "CMPOUT",
        "type": "output",
        "description": "Open-drain output of the independent comparator that requires a pull-up resistor to a supply rail and should be floated if the comparator is not used."
      },
      {
        "number": "16",
        "name": "COMP1",
        "type": "input",
        "description": "Buck-boost converter compensation pin 1 that requires the RC network described in section 9.3.12."
      },
      {
        "number": "17",
        "name": "COMP2",
        "type": "input",
        "description": "Buck-boost converter compensation pin 2 that requires the RC network described in section 9.3.12."
      },
      {
        "number": "18",
        "name": "CELL_BATPRESZ",
        "type": "input",
        "description": "Battery cell-count selection pin biased from VDDA through a resistor divider that also sets SYSOVP thresholds (5 V for 1-cell, 12 V for 2-cell, 19.5 V for 3/4-cell, 25 V for 5-cell), allows no external capacitor, and is pulled below VCELL_BATPRESZ_FALL on battery removal."
      },
      {
        "number": "19",
        "name": "SRN",
        "type": "input",
        "description": "Charge current sense amplifier negative input that also senses battery voltage, requiring a 0.1-µF filter capacitor across the battery sense resistor and a 10-Ω contact resistor to the pin."
      },
      {
        "number": "20",
        "name": "SRP",
        "type": "input",
        "description": "Charge current sense amplifier positive input requiring a 0.1-µF filter capacitor across the battery sense resistor and a 10-Ω contact resistor to the pin, with leakage matched to SRN."
      },
      {
        "number": "21",
        "name": "NC",
        "type": "unconnected",
        "description": "Not in use; this pin must be left floating."
      },
      {
        "number": "22",
        "name": "VSYS",
        "type": "input",
        "description": "Charger system voltage sensing input."
      },
      {
        "number": "23",
        "name": "SW2",
        "type": "passive",
        "description": "Boost-mode switching node connected to the source of the boost half-bridge high-side n-channel MOSFET."
      },
      {
        "number": "24",
        "name": "HIDRV2",
        "type": "output",
        "description": "Boost-mode high-side MOSFET (Q4) gate driver output connected to the high-side n-channel MOSFET gate."
      },
      {
        "number": "25",
        "name": "BTST2",
        "type": "power_out",
        "description": "Boost-mode high-side driver bootstrap supply; connect a 0.047-µF capacitor between SW2 and BTST2, with the bootstrap diode from REGN integrated."
      },
      {
        "number": "26",
        "name": "LODRV2",
        "type": "output",
        "description": "Boost-mode low-side MOSFET (Q3) gate driver output connected to the low-side n-channel MOSFET gate."
      },
      {
        "number": "27",
        "name": "PGND",
        "type": "power_in",
        "description": "Device power ground."
      },
      {
        "number": "28",
        "name": "REGN",
        "type": "power_out",
        "description": "6-V linear regulator output supplied from VBUS or VSYS, active when VBUS is above VVBUS_CONVEN, requiring a 2.2- or 3.3-µF ceramic capacitor to power ground and used for power-stage gate drive."
      },
      {
        "number": "29",
        "name": "LODRV1",
        "type": "output",
        "description": "Buck-mode low-side MOSFET (Q2) gate driver output connected to the low-side n-channel MOSFET gate."
      },
      {
        "number": "30",
        "name": "BTST1",
        "type": "power_out",
        "description": "Buck-mode high-side driver bootstrap supply; connect a 0.047-µF capacitor between SW1 and BTST1, with the bootstrap diode from REGN integrated."
      },
      {
        "number": "31",
        "name": "HIDRV1",
        "type": "output",
        "description": "Buck-mode high-side MOSFET (Q1) gate driver output connected to the high-side n-channel MOSFET gate."
      },
      {
        "number": "32",
        "name": "SW1",
        "type": "passive",
        "description": "Buck-mode switching node connected to the source of the buck half-bridge high-side n-channel MOSFET."
      },
      {
        "number": "33",
        "name": "Thermal Pad",
        "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-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 exposed thermal pad is listed in the pin table with no number ('–'), so it is not included as a ; The datasheet lists ACN, ACP, SRN, SRP, VBUS, VSYS and VDDA as 'PWR'. They are typed here by functio; SW1 and SW2 are typed 'passive' because the datasheet gives only 'PWR'. BTST1/BTST2 and REGN are typ",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 26,
        "cost_usd": 0.162,
        "at": "2026-10-18T11:06:05"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/ds/symlink/bq25731.pdf",
        "pages": 103,
        "sha256": "f4c1b09117e36158",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "sha256": "7b482a511cdf2cf875c31931f9fea7f745b8dac2ea6203531cd6604f40a290cb",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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}