component
LTC4121IUD#PBF
Public Made by Adomby adom
Analog Devices Battery Management, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"slug": "ltc4121iud-pbf",
"title": "LTC4121IUD#PBF",
"brief": "Analog Devices Battery Management, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
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"power management (pmic)",
"ltc4121iud#pbf",
"factory-2.0.0",
"extractor-text"
],
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"mpn": "LTC4121IUD#PBF",
"manufacturer": "Analog Devices",
"package": "QFN-16-EP(3x3)",
"pin_count": 17,
"category": "Power Management (PMIC)",
"subcategory": "Battery Management",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589041888461017088",
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"model_3d_step": "ltc4121iud-pbf-etched.step",
"model_3d_step_plain": "ltc4121iud-pbf.step",
"lbr": "ltc4121iud-pbf.lbr"
},
"distributor_links": {
"lcsc": "C687339",
"digikey": "505-LTC4121IUD#PBF-ND",
"mouser": "584-LTC4121IUD#PBF"
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"distributor_check": {
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"source": "Component Ocean /api/assign-pns",
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"status": "found",
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},
"pins": [
{
"number": "1",
"name": "INTVCC",
"type": "power_out",
"description": "Internal LDO regulator output that powers the switch gate drivers and the low battery charge current; connect a 2.2µF low ESR capacitor to GND and place no external load on it other than the NTC bias network."
},
{
"number": "2",
"name": "BOOST",
"type": "power_out",
"description": "Boosted supply pin with a 22nF boost capacitor connected from BOOST to SW; absolute maximum is VSW - 0.3V to (VSW + 6V)."
},
{
"number": "3",
"name": "IN",
"type": "power_in",
"description": "Positive input supply operating from 4.4V to 40V, decoupled to GND with a 10µF or larger low ESR capacitor; absolute maximum for IN is -0.3V to 43V."
},
{
"number": "4",
"name": "SW",
"type": "output",
"description": "Switch pin that delivers power from IN to BAT through the step-down regulator; an inductor connects from SW to CHGSNS, with DC limits of -0.3V to (VIN + 0.3V)."
},
{
"number": "5",
"name": "GND",
"type": "power_in",
"description": "Ground pin that must be connected to the exposed pad, which must be soldered to PCB ground for low electrical and thermal impedance."
},
{
"number": "6",
"name": "MPPT",
"type": "input",
"description": "Maximum power point tracking input that uses an external resistive divider from VIN to GND to set the regulated input voltage as a percentage of open-circuit voltage; if unused, connect to INTVCC or IN through a minimum 10k resistor."
},
{
"number": "7",
"name": "FREQ",
"type": "input",
"description": "Switching frequency select that connects to INTVCC for 1.5MHz or GND for 750kHz operation, and must not be left floating."
},
{
"number": "8",
"name": "CHGSNS",
"type": "input",
"description": "Battery charge current sense pin; an internal sense resistor (0.3Ω typical) between CHGSNS and BAT monitors charge current, with absolute maximum -0.3V to 18V."
},
{
"number": "9",
"name": "BAT",
"type": "power_out",
"description": "Battery output pin that delivers charge current through the internal sense resistor and must be decoupled with a low ESR 22µF ceramic capacitor to GND."
},
{
"number": "10",
"name": "FB",
"type": "input",
"description": "Battery voltage feedback pin (LTC4121 only) that regulates to a 2.4V float voltage through a divider from BAT to FB to FBG, programmable from 3.5V to 18V, with 25nA input bias current."
},
{
"number": "11",
"name": "FBG",
"type": "passive",
"description": "Feedback ground pin (LTC4121 only) that presents a low resistance (RFBG) to GND when sensing battery voltage and becomes high impedance in disabled or shutdown modes."
},
{
"number": "12",
"name": "NTC",
"type": "input",
"description": "Negative temperature coefficient thermistor input that pauses charging in STANDBY when the battery is out of range; requires a bias resistor from INTVCC and a thermistor to GND, and tying it to GND disables NTC qualified charging."
},
{
"number": "13",
"name": "PROG",
"type": "bidirectional",
"description": "Charge current program and monitor pin that uses a 1% resistor from 3.01k (400mA) to 24.3k (50mA) to GND and regulates to 1.227V in constant-current mode; keep parasitic capacitance minimal."
},
{
"number": "14",
"name": "CHRG",
"type": "output",
"description": "Open-drain charge status output that is pulled low while charging and sinks up to 5mA when enabled; it goes high impedance when termination occurs or charge current drops below 10% of the programmed value."
},
{
"number": "15",
"name": "FAULT",
"type": "output",
"description": "Open-drain fault status output that is pulled low on an NTC temperature fault or bad battery fault and sinks up to 5mA when enabled; it stays high impedance when no fault exists."
},
{
"number": "16",
"name": "RUN",
"type": "input",
"description": "Enable pin that disables the charger below its VEN threshold (2.45V typical rising) and enters shutdown below VSD (1.2V maximum falling); it must be tied to a resistive divider from VIN and must not be left floating."
},
{
"number": "17",
"name": "GND",
"type": "power_in",
"description": "Exposed pad on the package bottom that is GND and must be soldered to PCB ground to achieve the specified θJA of 54°C/W."
}
],
"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 datasheet has two pinouts. The LTC4121IUD#PBF is the programmable-float LTC4121, so pins 10 and ; The exposed pad is labeled pin 17 in the datasheet (GND, Exposed Pad Pin 17). It is included as '17'; Pin types for FBG (passive), PROG (bidirectional), NTC and CHGSNS (input) are engineering judgment b"
],
"pages_sent": 12,
"cost_usd": 0.0887,
"at": "2026-10-21T00:31:01"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589041888461017088",
"pages": 30,
"sha256": "637cc566763ce54c",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 17,
"described": 17,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
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"footprint": "viewers/footprint.html"
},
"models_3d": [
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"file": "ltc4121iud-pbf.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
3,
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0.785
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "3eb81ffac423a66cdcfead8efe56401da171edaf1f2257049aad7b2d3900f6c8",
"checked": "2026-10-21",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "ltc4121iud-pbf-etched.step",
"role": "eda",
"up": "Z",
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"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
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"zmin_mm": 0,
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"footprint_binding": "identity",
"sha256": "c9a4186b0794c2bb2999c98ece73ae32ab1032b10bf8c382c4f8476e091b9b99",
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]
},
"metadata": {
"specs": {
"Manufacturer": "Analog Devices",
"Package": "QFN-16-EP(3x3)",
"Category": "Power Management (PMIC)",
"Pins": "17"
},
"appearance": {
"contacts": {
"quote": "to the IN pin with the shortest copper traces possible.",
"page": 22,
"doc": "ds.pdf",
"material": "copper"
},
"version": 1,
"datasheet_sha256": "637cc566763ce54c80506cf6306c9f247c059dcdb563755f5175bb728606e0b3"
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"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "637cc566763ce54c80506cf6306c9f247c059dcdb563755f5175bb728606e0b3",
"rows": [
{
"name": "Input/RUN/CHRG/FAULT/MPPT voltage",
"symbol": "IN, RUN, CHRG, FAULT, MPPT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 43,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "CHGSNS, BAT, FB/BATSNS, FBG voltage",
"symbol": "CHGSNS, BAT, FB/BATSNS, FBG",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 18,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "FREQ, NTC, PROG, INTVCC voltage",
"symbol": "FREQ, NTC, PROG, INTVCC",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Charge/battery sense current",
"symbol": "ICHGSNS, IBAT",
"kind": "absolute_maximum",
"unit": "mA",
"min": -600,
"typ": null,
"max": 600,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Status pin current",
"symbol": "ICHRG, IFAULT",
"kind": "absolute_maximum",
"unit": "mA",
"min": -5,
"typ": null,
"max": 5,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Feedback pin current (LTC4121)",
"symbol": "IFB, IFBG",
"kind": "absolute_maximum",
"unit": "mA",
"min": -5,
"typ": null,
"max": 5,
"conditions": "LTC4121",
"source_page": 2,
"source": "datasheet"
},
{
"name": "INTVCC pin current",
"symbol": "IINTVCC",
"kind": "absolute_maximum",
"unit": "mA",
"min": -5,
"typ": null,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Operating junction temperature range",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Storage temperature range",
"symbol": "TSTG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"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": "Thermal resistance, junction to ambient",
"symbol": "θJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 54,
"max": null,
"conditions": "Exposed pad soldered to PCB",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Operating input supply range",
"symbol": "IN",
"kind": "electrical",
"unit": "V",
"min": 4.4,
"typ": null,
"max": 40,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Battery voltage range",
"symbol": "BAT",
"kind": "electrical",
"unit": "V",
"min": 0,
"typ": null,
"max": 18,
"conditions": "LTC4121 (Note 3)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC supply current, switching",
"symbol": "IIN",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 3.5,
"conditions": "Switching: FREQ = GND",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC supply current, standby",
"symbol": "IIN",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 142,
"max": 260,
"conditions": "Standby Mode: (Note 4)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC supply current, sleep",
"symbol": "IIN",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 60,
"max": 110,
"conditions": "LTC4121: VFB = 2.51V (Note 6)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC supply current, disabled",
"symbol": "IIN",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 37,
"max": 80,
"conditions": "Disabled Mode: VSD < VRUN < VEN (Note 4)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC supply current, shutdown",
"symbol": "IIN",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 20,
"max": 40,
"conditions": "Shutdown Mode: (Note 4)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Differential undervoltage lockout",
"symbol": "ΔVDUVLO",
"kind": "electrical",
"unit": "mV",
"min": 20,
"typ": 80,
"max": 160,
"conditions": "VIN – VBAT Falling, VIN = 5V (LTC4121)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "INTVCC undervoltage lockout rising threshold",
"symbol": "UVINTVCC",
"kind": "electrical",
"unit": "V",
"min": 4,
"typ": 4.15,
"max": 4.26,
"conditions": "INTVCC Rising, VIN = INTVCC + 100mV",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT standby current (LTC4121)",
"symbol": "IBAT",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 2.5,
"max": 4.5,
"conditions": "Standby Mode (LTC4121) (Notes 4, 8, 9)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BAT shutdown current (LTC4121)",
"symbol": "IBAT",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 1100,
"max": 2000,
"conditions": "Shutdown Mode (LTC4121) (Notes 4, 8, 9)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Feedback pin bias current (LTC4121)",
"symbol": "IFB",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 25,
"max": 60,
"conditions": "VFB = 2.5V (Note 6)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Feedback ground return resistance (LTC4121)",
"symbol": "RFBG",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": 1000,
"max": 2000,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Feedback pin regulation voltage (LTC4121)",
"symbol": "VFB(REG)",
"kind": "electrical",
"unit": "V",
"min": 2.393,
"typ": 2.4,
"max": 2.407,
"conditions": "(Note 6)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Feedback pin regulation voltage over temperature (LTC4121)",
"symbol": "VFB(REG)",
"kind": "electrical",
"unit": "V",
"min": 2.37,
"typ": null,
"max": 2.418,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Battery charge current",
"symbol": "ICHG",
"kind": "electrical",
"unit": "mA",
"min": 383,
"typ": 402,
"max": 421,
"conditions": "RPROG = 3.01k",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Battery charge current",
"symbol": "ICHG",
"kind": "electrical",
"unit": "mA",
"min": 45,
"typ": 50,
"max": 55,
"conditions": "RPROG = 24.3k",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Battery recharge threshold (LTC4121)",
"symbol": "VRCHG",
"kind": "electrical",
"unit": "mV",
"min": -38,
"typ": -49,
"max": -62,
"conditions": "VFB Falling Relative to VFB(REG) (LTC4121)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "PROG pin servo voltage",
"symbol": "VPROG",
"kind": "electrical",
"unit": "V",
"min": 1.206,
"typ": 1.227,
"max": 1.248,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Low battery linear charge current",
"symbol": "ILOWBAT",
"kind": "electrical",
"unit": "mA",
"min": 6,
"typ": 9,
"max": 16,
"conditions": "VFB < VTRKL, VBAT = 2.6V (LTC4121) (Note 6)",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Trickle charge threshold (LTC4121)",
"symbol": "VTRKL",
"kind": "electrical",
"unit": "V",
"min": 1.65,
"typ": 1.68,
"max": 1.71,
"conditions": "VFB Rising (Note 6)",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Safety timer termination period",
"symbol": "",
"kind": "electrical",
"unit": "hrs",
"min": 1.3,
"typ": 2,
"max": 2.8,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Bad battery termination timeout",
"symbol": "",
"kind": "electrical",
"unit": "min",
"min": 19,
"typ": 30,
"max": 42,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Switching frequency (high)",
"symbol": "fOSC",
"kind": "electrical",
"unit": "MHz",
"min": 1,
"typ": 1.5,
"max": 2,
"conditions": "FREQ = INTVCC",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Switching frequency (low)",
"symbol": "fOSC",
"kind": "electrical",
"unit": "MHz",
"min": 0.5,
"typ": 0.75,
"max": 1,
"conditions": "FREQ = GND",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Peak inductor current limit",
"symbol": "IPEAK",
"kind": "electrical",
"unit": "mA",
"min": 585,
"typ": 1050,
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