component
LTC4040EUFD#TRPBF
Public Made by Adomby adom
Analog Devices Battery Management, VQFN-24-EP(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
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"slug": "ltc4040eufd-trpbf",
"title": "LTC4040EUFD#TRPBF",
"brief": "Analog Devices Battery Management, VQFN-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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"ltc4040eufd#trpbf",
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"component": {
"mpn": "LTC4040EUFD#TRPBF",
"manufacturer": "Analog Devices",
"package": "VQFN-24-EP(4x5)",
"pin_count": 25,
"category": "Power Management (PMIC)",
"subcategory": "Battery Management",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589863999937814528",
"parts": {
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"lcsc": "C687163",
"digikey": "LTC4040EUFD#TRPBFTR-ND",
"mouser": "584-LTC4040EUFDTRPBF"
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"distributor_check": {
"checked_at": "2026-10-18T06:47:17Z",
"source": "Component Ocean /api/assign-pns",
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"pn": "LTC4040EUFD#TRPBFTR-ND",
"status": "found",
"lifecycle": "Active"
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"status": "found"
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"pins": [
{
"number": "1",
"name": "VSYS",
"type": "power_out",
"description": "System voltage output that powers the external load from the input supply or the backup battery and charges the battery when input power is available; bypass with a low-ESR ceramic capacitor of at least 100µF to GND."
},
{
"number": "2",
"name": "PROG",
"type": "passive",
"description": "Charge current program pin where an external resistor to ground sets full-scale charge current; it servos to 0.8V at full scale, with BAT-to-PROG current ratio internally set to 2500."
},
{
"number": "3",
"name": "CLPROG",
"type": "output",
"description": "VSYS current monitor output whose voltage equals 32 times the VIN-to-CLN differential, and charge current is reduced when it reaches 0.8V."
},
{
"number": "4",
"name": "CHGOFF",
"type": "input",
"description": "Battery charger disable input: tie to GND to enable the charger or to a voltage above 1.2V to disable it, and do not leave it unconnected."
},
{
"number": "5",
"name": "BSTOFF",
"type": "input",
"description": "Backup boost converter disable input: tie to GND to enable backup or to a voltage above 1.2V to disable it, and do not leave it unconnected."
},
{
"number": "6",
"name": "VIN",
"type": "power_in",
"description": "Input supply pin that can be driven directly when OVP is not used, otherwise an external N-channel FET is connected between the supply output VPWR and this pin."
},
{
"number": "7",
"name": "CLN",
"type": "input",
"description": "Negative terminal of the external input current-limit sense resistor between VIN and CLN, which regulates the sense drop to 25mV and does not limit system current if the drop exceeds 25mV."
},
{
"number": "8",
"name": "CHRG",
"type": "output",
"description": "Open-drain charge status output, typically pulled up to a reference voltage, that is pulled low during charging until charge current falls below C/8."
},
{
"number": "9",
"name": "FAULT",
"type": "output",
"description": "Open-drain fault status output, typically pulled up to a reference voltage, that is pulled low on a temperature fault or bad-battery fault during charging."
},
{
"number": "10",
"name": "RSTFB",
"type": "input",
"description": "High-impedance input to the reset comparator with a 0.74V falling threshold and 20mV hysteresis, using an external divider between VSYS, RSTFB and GND."
},
{
"number": "11",
"name": "RST",
"type": "output",
"description": "Open-drain reset output pulled to ground whenever RSTFB falls below 0.74V and becoming high impedance 232ms after RSTFB recovers."
},
{
"number": "12",
"name": "F2",
"type": "input",
"description": "Logic input selecting battery chemistry, where logic high selects Li-Ion and logic low selects LiFePO4, and it must not be left unconnected."
},
{
"number": "13",
"name": "F1",
"type": "input",
"description": "Logic input selecting one of four charge voltage settings for the chosen chemistry, and it must not be left unconnected."
},
{
"number": "14",
"name": "F0",
"type": "input",
"description": "Logic input selecting one of four charge voltage settings for the chosen chemistry, and it must not be left unconnected."
},
{
"number": "15",
"name": "IGATE",
"type": "output",
"description": "Gate drive from an internal charge pump for the external N-channel pass FETs, where the first FET (VPWR to VIN) is part of the optional OVP and the second FET (VIN to VSYS) is mandatory for backup disconnect."
},
{
"number": "16",
"name": "OVSNS",
"type": "input",
"description": "Overvoltage protection sense input that connects through a 6.2k resistor to the input connector and FET drain if OVP is used, or is shorted to VIN if not; IGATE is pulled to GND when it exceeds about 6V."
},
{
"number": "17",
"name": "NTC",
"type": "passive",
"description": "Thermistor monitoring input that uses a low-drift bias resistor from VIN and a thermistor to GND to pause charging when the battery is too hot or too cold, and should be grounded if NTC is not used."
},
{
"number": "18",
"name": "BSTFB",
"type": "input",
"description": "Feedback input for the backup boost regulator that servos to 0.8V during steady-state backup operation."
},
{
"number": "19",
"name": "PFI",
"type": "input",
"description": "High-impedance power-fail comparator input with a 1.19V falling threshold and 30mV hysteresis that sets the input voltage below which boost backup starts."
},
{
"number": "20",
"name": "PFO",
"type": "output",
"description": "Open-drain power-fail status output that is pulled to ground when PFI is below its falling threshold and becomes high impedance once PFI rises above the rising threshold."
},
{
"number": "21",
"name": "SW",
"type": "passive",
"description": "Switch node for the buck charger and boost backup converter, requiring a 1µH to 2.2µH inductor connected from SW to BAT."
},
{
"number": "22",
"name": "SW",
"type": "passive",
"description": "Switch node for the buck charger and boost backup converter, requiring a 1µH to 2.2µH inductor connected from SW to BAT."
},
{
"number": "23",
"name": "BAT",
"type": "bidirectional",
"description": "Single-cell Li-Ion or LiFePO4 battery connection that supplies VSYS through the boost converter in backup and is charged from VSYS through the buck charger; bypass with a low-ESR ceramic capacitor of at least 10µF to GND."
},
{
"number": "24",
"name": "VSYS",
"type": "power_out",
"description": "System voltage output that powers the external load from the input supply or the backup battery and charges the battery when input power is available; bypass with a low-ESR ceramic capacitor of at least 100µF to GND."
},
{
"number": "25",
"name": "GND",
"type": "power_in",
"description": "Exposed pad that must be soldered to the PCB to provide a low electrical and thermal impedance connection to ground."
}
],
"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 drawing text on page 2 is garbled, so pin numbers were taken from the Pin Functions sec; The datasheet does not state a pin type for PROG, NTC, and the SW pins; these were classified as pas; BAT both sources power to VSYS in backup and sinks charge current, so it was classed as bidirectiona"
],
"pages_sent": 10,
"cost_usd": 0.0893,
"at": "2026-10-18T06:45:05"
},
"datasheet": {
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"pages": 26,
"sha256": "957228362ca0845d",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 25,
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"metadata": {
"specs": {
"Manufacturer": "Analog Devices",
"Package": "VQFN-24-EP(4x5)",
"Category": "Power Management (PMIC)",
"Pins": "25"
},
"characteristics": {
"version": 1,
"source": "datasheet",
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"rows": [
{
"name": "VIN Input Voltage Range",
"symbol": "VIN",
"kind": "electrical",
"unit": "V",
"min": 3.5,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VBAT Battery Voltage Range (Backup Boost Input)",
"symbol": "VBAT",
"kind": "electrical",
"unit": "V",
"min": 2.7,
"typ": null,
"max": 5,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Quiescent Current, Normal Mode",
"symbol": "IBATQ",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 45,
"max": 70,
"conditions": "Normal Mode (VPFI = 2V), Battery Charger Timed Out",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Quiescent Current, Shutdown",
"symbol": "IBATQ",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 1.5,
"max": 3,
"conditions": "Shutdown (BSTOFF = CHGOFF = 1)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VIN Quiescent Current, Shutdown",
"symbol": "IINQ",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 3.5,
"max": 7,
"conditions": "Shutdown (BSTOFF = CHGOFF=1)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for LiFePO4 Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 3.42,
"typ": 3.45,
"max": 3.48,
"conditions": "F2 = 0, F1 = 0, F0 = 0",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for LiFePO4 Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 3.47,
"typ": 3.5,
"max": 3.53,
"conditions": "F2 = 0, F1 = 0, F0 = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for LiFePO4 Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 3.52,
"typ": 3.55,
"max": 3.58,
"conditions": "F2 = 0, F1 = 1, F0 = 0",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for LiFePO4 Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 3.57,
"typ": 3.6,
"max": 3.63,
"conditions": "F2 = 0, F1 = 1, F0 = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for Li-Ion Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 3.92,
"typ": 3.95,
"max": 3.98,
"conditions": "F2 = 1, F1 = 0, F0 = 0",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for Li-Ion Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 3.97,
"typ": 4,
"max": 4.03,
"conditions": "F2 = 1, F1 = 0, F0 = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for Li-Ion Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 4.02,
"typ": 4.05,
"max": 4.08,
"conditions": "F2 = 1, F1 = 1, F0 = 0",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT Regulated Output Voltage for Li-Ion Option",
"symbol": "VCHG",
"kind": "electrical",
"unit": "V",
"min": 4.07,
"typ": 4.1,
"max": 4.13,
"conditions": "F2 = 1, F1 = 1, F0 = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Regulated Battery Charge Current",
"symbol": "ICHG",
"kind": "electrical",
"unit": "mA",
"min": 950,
"typ": 1000,
"max": 1050,
"conditions": "RPROG = 2k",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VSYS-to-VBAT Differential Undervoltage Lockout Threshold (Falling)",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 40,
"typ": 50,
"max": 60,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VSYS-to-BAT Differential Undervoltage Lockout Threshold (Rising)",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 125,
"typ": 145,
"max": 165,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Input Current Limit Threshold Voltage",
"symbol": "VIN – VCLN",
"kind": "electrical",
"unit": "mV",
"min": 23.5,
"typ": 25,
"max": 26.5,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Recharge Battery Threshold Voltage (relative to VCHG)",
"symbol": "VRECHG",
"kind": "electrical",
"unit": "%",
"min": 94.2,
"typ": 95,
"max": 95.8,
"conditions": "F2 = 0 and F1 = 1",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Recharge Battery Threshold Voltage (relative to VCHG)",
"symbol": "VRECHG",
"kind": "electrical",
"unit": "%",
"min": 96.7,
"typ": 97.5,
"max": 98.3,
"conditions": "All other cases",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Safety Timer Termination Period",
"symbol": "tTERMINATE",
"kind": "electrical",
"unit": "Hours",
"min": 3.7,
"typ": 4.25,
"max": 5,
"conditions": "Timer starts when VBAT = VCHG; F2 = 1 (Li-Ion)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Safety Timer Termination Period",
"symbol": "tTERMINATE",
"kind": "electrical",
"unit": "Hours",
"min": 1.85,
"typ": 2.13,
"max": 2.5,
"conditions": "Timer starts when VBAT = VCHG; F2 = 0 (LiFePO4)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Low Battery Threshold Voltage for Trickle Charge",
"symbol": "VLOWBAT",
"kind": "electrical",
"unit": "V",
"min": 2.75,
"typ": 2.85,
"max": 2.95,
"conditions": "VBAT Rising",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Bad-Battery Termination Time",
"symbol": "tBADBAT",
"kind": "electrical",
"unit": "Hours",
"min": 0.47,
"typ": 0.54,
"max": 0.64,
"conditions": "VBAT < (VLOWBAT − ΔVLOWBAT)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "End-of-Charge Indication PROG Pin Average Voltage",
"symbol": "VC/8",
"kind": "electrical",
"unit": "mV",
"min": 90,
"typ": 100,
"max": 110,
"conditions": "PROG Pin Average Voltage",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Step-Down (Buck) Converter Switching Frequency",
"symbol": "fOSC(BUCK)",
"kind": "electrical",
"unit": "MHz",
"min": 1.96,
"typ": 2.25,
"max": 2.65,
"conditions": "Normal Mode (VPFI > 1.21V)",
"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": "NTC Cold Temperature Fault Threshold Voltage (Rising)",
"symbol": "VCOLD",
"kind": "electrical",
"unit": "%VIN",
"min": 75,
"typ": 76.5,
"max": 78,
"conditions": "Rising Voltage Threshold",
"source_page": 4,
"source": "datasheet"
},
{
"name": "NTC Hot Temperature Fault Threshold Voltage (Falling)",
"symbol": "VHOT",
"kind": "electrical",
"unit": "%VIN",
"min": 33.4,
"typ": 34.9,
"max": 36.4,
"conditions": "Falling Voltage Threshold",
"source_page": 4,
"source": "datasheet"
},
{
"name": "NTC Disable Threshold Voltage (Falling)",
"symbol": "VDIS",
"kind": "electrical",
"unit": "%VIN",
"min": 0.7,
"typ": 1.7,
"max": 2.7,
"conditions": "Falling Threshold",
"source_page": 4,
"source": "datasheet"
},
{
"name": "NTC Leakage Current",
"symbol": "INTC",
"kind": "electrical",
"unit": "nA",
"min": -20,
"typ": null,
"max": 20,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "BSTFB Reference Voltage",
"symbol": "VBSTFB",
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