LTC4041EUFD#PBF

{
  "slug": "ltc4041eufd-pbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices Battery Management, QFN-24-EP(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "ltc4041eufd#pbf",
    "factory-2.0.0",
    "extractor-text"
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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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      "footprint": "ltc4041eufd-pbf.kicad_mod",
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      "lbr": "ltc4041eufd-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C3151895",
      "digikey": "505-LTC4041EUFD#PBF-ND",
      "mouser": "584-4041EUFDPB"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T00:38:32Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-LTC4041EUFD#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-4041EUFDPB",
        "status": "found"
      }
    },
    "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"
      },
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        "pages": 26,
        "sha256": "fb432e97896944d4",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 25,
        "described": 25,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "checked": "2026-10-18",
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}