component
BQ25731RSNR
Public Made by Adomby adom
Texas Instruments Battery Management, QFN-32(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"type": "component",
"slug": "bq25731rsnr",
"title": "BQ25731RSNR",
"brief": "Texas Instruments Battery Management, QFN-32(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"power management (pmic)",
"bq25731rsnr",
"factory-2.0.0",
"extractor-text"
],
"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"
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"distributor_links": {
"lcsc": "C2871872"
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"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": {
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"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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{
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"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "QFN-32(4x4)",
"Category": "Power Management (PMIC)",
"Pins": "33"
},
"characteristics": {
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"source": "datasheet",
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"rows": [
{
"name": "Voltage: SRN, SRP, ACN, ACP, VBUS, VSYS",
"symbol": "",
"kind": "absolute_maximum",
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"min": -0.3,
"typ": null,
"max": 32,
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"source_page": 8,
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{
"name": "Voltage: SW1, SW2",
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"conditions": "Over operating free-air temperature range",
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{
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{
"name": "Voltage: SDA, SCL, REGN, PSYS, CHRG_OK, CELL_BATPRESZ, ILIM_HIZ, LODRV1, LODRV2, VDDA, COMP2, CMPIN, CMPOUT, OTG/VAP/FRS",
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{
"name": "Voltage: PROCHOT",
"symbol": "",
"kind": "absolute_maximum",
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"min": -0.3,
"typ": null,
"max": 5.5,
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"source_page": 8,
"source": "datasheet"
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{
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"source": "datasheet"
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{
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"conditions": "Over operating free-air temperature range",
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{
"name": "Differential voltage: SRP-SRN, ACP-ACN",
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"min": -0.5,
"typ": null,
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"conditions": "Over operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
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{
"name": "Junction temperature range",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
"conditions": "Over operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
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{
"name": "Storage temperature",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
"typ": null,
"max": 150,
"conditions": "Over operating free-air temperature range",
"source_page": 8,
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{
"name": "Voltage 25 ns transient: LODRV1, LODRV2",
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"min": -4,
"typ": null,
"max": 7,
"conditions": "25 ns",
"source_page": 8,
"source": "datasheet"
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{
"name": "Voltage 25 ns transient: HIDRV1, HIDRV2",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -4,
"typ": null,
"max": 38,
"conditions": "25 ns",
"source_page": 8,
"source": "datasheet"
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{
"name": "Voltage 25 ns transient: SW1, SW2",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -4,
"typ": null,
"max": 32,
"conditions": "25 ns",
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{
"name": "Voltage: ACN, ACP, VBUS",
"symbol": "",
"kind": "recommended_operating",
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"min": 0,
"typ": null,
"max": 26,
"conditions": "Operating free-air temperature range",
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{
"name": "Voltage: SRN, SRP, VSYS",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 23.15,
"conditions": "Operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Voltage: SW1, SW2",
"symbol": "",
"kind": "recommended_operating",
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"min": -2,
"typ": null,
"max": 26,
"conditions": "Operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
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{
"name": "Voltage: BTST1, BTST2, HIDRV1, HIDRV2",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 32,
"conditions": "Operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
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{
"name": "Voltage: SDA, SCL, REGN, PSYS, CHRG_OK, CELL_BATPRESZ, ILIM_HIZ, LODRV1, LODRV2, VDDA, COMP2, CMPIN, CMPOUT, OTG/VAP/FRS",
"symbol": "",
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{
"name": "Voltage: PROCHOT",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 5.3,
"conditions": "Operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
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{
"name": "Voltage: IADPT, IBAT, COMP1",
"symbol": "",
"kind": "recommended_operating",
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"min": 0,
"typ": null,
"max": 3.3,
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"source": "datasheet"
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{
"name": "Differential voltage: SRP-SRN, ACP-ACN",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 0.5,
"conditions": "Operating free-air temperature range",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Voltage: BATDRV-VSYS",
"symbol": "",
"kind": "recommended_operating",
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"min": 0,
"typ": null,
"max": 10.8,
"conditions": "Operating free-air temperature range",
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"source": "datasheet"
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"kind": "recommended_operating",
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"min": -20,
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"max": 125,
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"min": -20,
"typ": null,
"max": 85,
"conditions": "Operating free-air temperature range",
"source_page": 9,
"source": "datasheet"
},
{
"name": "Input voltage operating range",
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