component
LTC4041EUFD#PBF
Public Made by Adomby adom
Analog Devices Battery Management, QFN-24-EP(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "ltc4041eufd-pbf",
"title": "LTC4041EUFD#PBF",
"brief": "Analog Devices Battery Management, QFN-24-EP(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"ltc4041eufd#pbf",
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"component": {
"mpn": "LTC4041EUFD#PBF",
"manufacturer": "Analog Devices",
"package": "QFN-24-EP(4x5)",
"pin_count": 25,
"category": "Power Management (PMIC)",
"subcategory": "Battery Management",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589837639831887872",
"parts": {
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"distributor_links": {
"lcsc": "C3151895",
"digikey": "505-LTC4041EUFD#PBF-ND",
"mouser": "584-4041EUFDPB"
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"checked_at": "2026-10-18T00:38:32Z",
"source": "Component Ocean /api/assign-pns",
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"pn": "505-LTC4041EUFD#PBF-ND",
"status": "found"
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"pn": "584-4041EUFDPB",
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},
"pins": [
{
"number": "1",
"name": "VSYS",
"type": "power_out",
"description": "System voltage output that supplies the external load from the input or from the supercapacitor in backup, and must be bypassed with at least 100µF of low-ESR ceramic capacitor to GND."
},
{
"number": "2",
"name": "PROG",
"type": "passive",
"description": "Charge-current program pin where an external resistor to GND sets full-scale charge current, with PROG servoing to 0.8V and an SCAP-to-PROG current ratio of 2500."
},
{
"number": "3",
"name": "IMON",
"type": "output",
"description": "VSYS current monitor whose voltage is 32 times the VIN-to-CLN differential voltage, and charge current is reduced when IMON reaches 0.8V."
},
{
"number": "4",
"name": "CHGEN",
"type": "input",
"description": "Disable input for the supercapacitor charger that enables charging when tied to GND and disables it when above 1.2V, and must not be left unconnected."
},
{
"number": "5",
"name": "BSTEN",
"type": "input",
"description": "Disable input for the backup boost converter that enables backup when tied to GND and disables it when above 1.2V, and must not be left unconnected."
},
{
"number": "6",
"name": "VIN",
"type": "power_in",
"description": "Input pin that can be driven directly when OVP is not used, or fed through an external N-channel FET from the input supply VPWR when OVP is required."
},
{
"number": "7",
"name": "CLN",
"type": "input",
"description": "Negative terminal of the external input-current sense resistor between VIN and CLN, where the charger regulates to 25mV across the resistor but does not limit system current if the drop exceeds 25mV."
},
{
"number": "8",
"name": "CAPFLT",
"type": "output",
"description": "Open-drain supercapacitor fault output that pulls low and disables charging if any single supercapacitor exceeds 2.7V or disables backup if any falls below -20mV, with a 10µA pull-down capability and tie-high to keep operation enabled."
},
{
"number": "9",
"name": "BAL",
"type": "passive",
"description": "Supercapacitor balance point for a two-capacitor stack that the internal balancer drives to half of VSCAP, and which must be left open when only one supercapacitor is used."
},
{
"number": "10",
"name": "RSTFB",
"type": "input",
"description": "High-impedance input to the SYSGD comparator with a 0.74V falling threshold and 20mV hysteresis, driven from an external divider between VSYS and GND."
},
{
"number": "11",
"name": "SYSGD",
"type": "output",
"description": "Open-drain system power-good output that is pulled to GND by an internal N-channel MOSFET whenever RSTFB falls below 0.74V."
},
{
"number": "12",
"name": "CAPFB",
"type": "input",
"description": "Supercapacitor (single or two-stack) feedback input from an external divider between SCAP and GND that nominally servos to 0.8V to program the final charge voltage."
},
{
"number": "13",
"name": "CAPGD",
"type": "output",
"description": "Open-drain supercapacitor power-good output that stays pulled low until CAPFB rises to 92.5% of its regulation point."
},
{
"number": "14",
"name": "PFO",
"type": "output",
"description": "Open-drain power-fail status output that is pulled to GND when PFI is below its falling threshold and becomes high impedance once PFI rises above its rising threshold."
},
{
"number": "15",
"name": "IGATE",
"type": "output",
"description": "Gate drive for the external N-channel pass FET(s) from an internal charge pump, where the mandatory VIN-to-VSYS FET disconnects the system from the input during backup."
},
{
"number": "16",
"name": "OVSNS",
"type": "input",
"description": "Overvoltage protection sense input that connects through a 6.2k resistor to the input supply and the pass FET drain, or is shorted to VIN if OVP is unused, and pulls IGATE to GND when it exceeds 6V (typical)."
},
{
"number": "17",
"name": "CPF",
"type": "passive",
"description": "Minimum backup time program pin where a capacitor sets tMIN-BACKUP, and which must not be tied to GND or left unconnected."
},
{
"number": "18",
"name": "BSTFB",
"type": "input",
"description": "Feedback input for the backup boost regulator that servos to 0.8V during backup operation."
},
{
"number": "19",
"name": "PFI",
"type": "input",
"description": "High-impedance power-fail input with a 1.19V falling threshold and 40mV hysteresis that controls PFO and sets the input voltage below which backup boost starts."
},
{
"number": "20",
"name": "CAPSEL",
"type": "input",
"description": "Supercapacitor stack selector that must be tied above 1.2V for a two-capacitor stack or to GND for a single supercapacitor, and must not be left unconnected."
},
{
"number": "21",
"name": "SW",
"type": "passive",
"description": "Switch pin for the buck charger and boost backup converter, connected to SCAP through a 1µH to 2.2µH inductor."
},
{
"number": "22",
"name": "SW",
"type": "passive",
"description": "Switch pin for the buck charger and boost backup converter, connected to SCAP through a 1µH to 2.2µH inductor."
},
{
"number": "23",
"name": "SCAP",
"type": "bidirectional",
"description": "Supercapacitor pin for a single supercapacitor or the top of a two-capacitor stack, which supplies VSYS through the boost in backup or is charged from VSYS by the buck charger."
},
{
"number": "24",
"name": "VSYS",
"type": "power_out",
"description": "System voltage output pin that supplies the external load from the input or from the supercapacitor in backup, and must be bypassed with at least 100µF of low-ESR ceramic capacitor to GND."
},
{
"number": "25",
"name": "GND",
"type": "power_in",
"description": "Exposed pad that must be soldered to the PCB to provide low electrical and thermal impedance ground, with a continuous ground plane on the second layer strongly recommended."
}
],
"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 top-view pin-configuration drawing on page 2 is garbled in the extracted text, so pin positions ; KiCad ERC has no open-drain class in the requested set, so open-drain status outputs (CAPFLT, SYSGD,"
],
"pages_sent": 10,
"cost_usd": 0.083,
"at": "2026-10-18T00:35:55"
},
"datasheet": {
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"sha256": "fb432e97896944d4",
"source_tier": "lcsc"
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"described": 25,
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"metadata": {
"specs": {
"Manufacturer": "Analog Devices",
"Package": "QFN-24-EP(4x5)",
"Category": "Power Management (PMIC)",
"Pins": "25"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "fb432e97896944d4994fe959e512d892b2f3ee7138304e09405f68fcb0957337",
"rows": [
{
"name": "VIN Transient Voltage",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "t < 1ms, Duty Cycle < 1%",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Steady-State Voltage (VIN, SCAP, BAL, CLN, VSYS, BSTFB, PFI, CPF, CAPFB, CAPFLT, PFO, SYSGD, OVSNS, IMON)",
"symbol": "VIN, SCAP, BAL, CLN, VSYS, BSTFB, PFI, CPF, CAPFB, CAPFLT, PFO, SYSGD, OVSNS, IMON",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "Steady state",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Voltage (BSTEN, CHGEN, CAPGD, RSTFB, CAPSEL)",
"symbol": "BSTEN, CHGEN, CAPGD, RSTFB, CAPSEL",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Upper limit is [Max (VIN, VSCAP, VSYS) +0.3V]; no numeric max printed",
"source_page": 2,
"source": "datasheet"
},
{
"name": "IOVSNS Current",
"symbol": "IOVSNS",
"kind": "absolute_maximum",
"unit": "mA",
"min": -10,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Current (ICAPGD, IPFO, ISYSGD)",
"symbol": "ICAPGD, IPFO, ISYSGD",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "IPROG Current",
"symbol": "IPROG",
"kind": "absolute_maximum",
"unit": "mA",
"min": -1.1,
"typ": null,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Operating Junction Temperature Range",
"symbol": "TJ",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "Notes 2, 3",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Storage Temperature Range",
"symbol": "TSTG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "Note 1",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum Junction Temperature",
"symbol": "TJMAX",
"kind": "thermal",
"unit": "°C",
"min": null,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Input Voltage Range",
"symbol": "VIN",
"kind": "electrical",
"unit": "V",
"min": 2.9,
"typ": null,
"max": 5.5,
"conditions": "l",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Supercapacitor Voltage Range (Backup Boost Input)",
"symbol": "VSCAP",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 5.4,
"conditions": "l",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VIN and VSYS Total Quiescent Current, Charger Mode with Charging Complete and Backup Boost Active",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 800,
"max": 1600,
"conditions": "CAPSEL = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "SCAP Quiescent Current, Charger Mode with Charging Complete and Backup Boost Active",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 13,
"max": 26,
"conditions": "CAPSEL = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VIN and VSYS Total Quiescent Current, Charger Mode with Charging Complete and Backup Boost in Sleep",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 275,
"max": 550,
"conditions": "CAPSEL = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "SCAP Quiescent Current, Charger Mode with Charging Complete and Backup Boost in Sleep",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 13,
"max": 26,
"conditions": "CAPSEL = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VSYS Quiescent Current, Backup Mode with Backup Boost in Sleep",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 75,
"max": 150,
"conditions": "l; VIN = 0V, CAPSEL = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "SCAP Quiescent Current, Backup Mode with Backup Boost in Sleep",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 1,
"max": 2,
"conditions": "l; VIN = 0V, CAPSEL = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VIN Quiescent Current, Shutdown",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 5.5,
"max": 11,
"conditions": "CHGEN = BSTEN = CAPSEL = 1, VSYS = 0V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "SCAP Quiescent Current, Shutdown",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0,
"max": 1,
"conditions": "l; CHGEN = BSTEN = CAPSEL = 1, VSYS = 0V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CAPFB Pin Servo Voltage",
"symbol": "VCAPFB",
"kind": "electrical",
"unit": "V",
"min": 0.788,
"typ": 0.8,
"max": 0.812,
"conditions": "l",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CAPFB Pin Input Leakage Current",
"symbol": "ICAPFB",
"kind": "electrical",
"unit": "nA",
"min": -50,
"typ": 0,
"max": 50,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Regulated Supercapacitor Charge Current",
"symbol": "ICHG",
"kind": "electrical",
"unit": "mA",
"min": 950,
"typ": 1000,
"max": 1050,
"conditions": "RPROG = 2k, VSCAP >1V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VSYS-to-VSCAP Differential Undervoltage Lockout Threshold, Falling",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 30,
"typ": 50,
"max": 70,
"conditions": "(VSYS – VSCAP) Falling",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VSYS-to-VSCAP Differential Undervoltage Lockout Threshold, Rising",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 100,
"typ": 150,
"max": 200,
"conditions": "(VSYS – VSCAP) Rising",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Input Current Limit Threshold Voltage (first printed row)",
"symbol": "VIN – VCLN",
"kind": "electrical",
"unit": "mV",
"min": 23.5,
"typ": 25,
"max": 26.5,
"conditions": "l",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Input Current Limit Threshold Voltage (second printed row)",
"symbol": "VIN – VCLN",
"kind": "electrical",
"unit": "mV",
"min": 22,
"typ": 25,
"max": 28,
"conditions": "l",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Recharge Threshold Voltage",
"symbol": "VRECHRG",
"kind": "electrical",
"unit": "%",
"min": 96.2,
"typ": 97.5,
"max": 98.8,
"conditions": "As a Percentage of the Regulated VSCAP",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CAPGD Rising Threshold",
"symbol": "",
"kind": "electrical",
"unit": "%",
"min": 90,
"typ": 92.5,
"max": 95,
"conditions": "As a Percentage of the Regulated VSCAP",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Step-Down Converter Switching Frequency",
"symbol": "fOSC(BUCK)",
"kind": "electrical",
"unit": "MHz",
"min": 2,
"typ": 2.25,
"max": 2.5,
"conditions": "VSCAP>1V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "PMOS Switch Current Limit",
"symbol": "ILIM(BUCK)",
"kind": "electrical",
"unit": "A",
"min": 3,
"typ": null,
"max": 4.3,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Supercapacitor Balance Point",
"symbol": "VBAL",
"kind": "electrical",
"unit": "%",
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