component
LTC4121EUD#TRPBF
Public Made by Adomby adom
Analog Devices Battery Management ICs, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "LTC4121EUD#TRPBF",
"brief": "Analog Devices Battery Management ICs, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
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"package": "QFN-16-EP(3x3)",
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"category": "Power Management ICs",
"subcategory": "Battery Management ICs",
"datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/4121fbc.pdf",
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"digikey": "LTC4121EUD#TRPBFTR-ND",
"mouser": "584-LTC4121EUD#TRPBF"
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"pins": [
{
"number": "1",
"name": "INTVCC",
"type": "power_out",
"description": "Output of the internal LDO from IN that supplies the gate drivers and ILOWBAT; needs a 2.2µF low-ESR capacitor to GND and no external load other than the NTC bias network."
},
{
"number": "2",
"name": "BOOST",
"type": "passive",
"description": "Boosted supply pin; connect a 22nF boost capacitor from this pin to SW."
},
{
"number": "3",
"name": "IN",
"type": "power_in",
"description": "Positive input supply (4.4V to 40V); decouple to GND with a 10µF or larger low-ESR capacitor that must settle within the ~36ms MPPT sample pulse."
},
{
"number": "4",
"name": "SW",
"type": "output",
"description": "Switch pin delivering power from IN to BAT through the step-down regulator; connect an inductor from SW to CHGSNS."
},
{
"number": "5",
"name": "GND",
"type": "power_in",
"description": "Ground pin; connect to the Exposed Pad, which must be soldered to PCB GND."
},
{
"number": "6",
"name": "MPPT",
"type": "input",
"description": "Input voltage regulation programming pin; connect a resistive divider from VIN to MPPT to GND, or tie to INTVCC or IN through at least 10k if unused, keeping parasitic capacitance minimal."
},
{
"number": "7",
"name": "FREQ",
"type": "input",
"description": "Switching frequency select: INTVCC for 1.5MHz or GND for 750kHz; do not float."
},
{
"number": "8",
"name": "CHGSNS",
"type": "passive",
"description": "Battery charge current sense pin, connected through the internal 0.3Ω sense resistor to BAT; connect the inductor from SW to this pin."
},
{
"number": "9",
"name": "BAT",
"type": "bidirectional",
"description": "Battery output pin that delivers charge current through the internal sense resistor and sources ILOWBAT for preconditioning; decouple with a low-ESR 22µF ceramic capacitor to GND."
},
{
"number": "10",
"name": "FB",
"type": "input",
"description": "Battery voltage feedback pin regulated to 2.4V; set float voltage (3.5V to 18V) with a divider from BAT to FB to FBG, ideally 588k Thevenin resistance to cancel the 25nA bias current."
},
{
"number": "11",
"name": "FBG",
"type": "passive",
"description": "Feedback ground pin that presents a low resistance RFBG to GND when sensing the battery and is high impedance in disabled or shutdown modes."
},
{
"number": "12",
"name": "NTC",
"type": "input",
"description": "Input to the thermistor monitoring circuit, needing a bias resistor from INTVCC and an NTC thermistor to GND; tie to GND to disable NTC qualified charging."
},
{
"number": "13",
"name": "PROG",
"type": "passive",
"description": "Charge current program and monitor pin; connect a 1% resistor of 3.01k (400mA) to 24.3k (50mA) to GND, regulates to 1.227V in constant-current mode with ICHG = hPROG·VPROG/RPROG."
},
{
"number": "14",
"name": "CHRG",
"type": "output",
"description": "Open-drain charge status output that is pulled low while charging and high impedance at timer expiry or when charge current falls below 10% of the programmed value; sinks up to 5mA and can be pulled up to IN."
},
{
"number": "15",
"name": "FAULT",
"type": "output",
"description": "Open-drain fault status output pulled low for an NTC temperature fault or bad battery fault; sinks up to 5mA and can be pulled up to IN."
},
{
"number": "16",
"name": "RUN",
"type": "input",
"description": "Run pin: below VEN (2.45V rising) the device is disabled and below VSD it enters shutdown; use a divider from VIN to program the charging enable voltage and do not float."
},
{
"number": "17",
"name": "GND",
"type": "power_in",
"description": "Exposed pad is GND and must be soldered to PCB GND for low electrical and thermal impedance (θJA 54°C/W)."
}
],
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"primary_model": "claude-sonnet-5-5",
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"consensus_model": "claude-sonnet-5-5",
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"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: MPN LTC4121EUD#TRPBF is the programmable-float LTC4121 (not -4.2), so pin 10 is FB and pin 11 is FBG"
],
"pages_sent": 12,
"cost_usd": 0.1655,
"at": "2026-10-30T11:59:21"
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"datasheet": {
"url": "https://www.analog.com/media/en/technical-documentation/data-sheets/4121fbc.pdf",
"pages": 30,
"sha256": "637cc566763ce54c",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 17,
"cites_pages": true,
"refuses_to_fabricate": true
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"zmin_mm": 0,
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"footprint_binding": "identity",
"sha256": "3eb81ffac423a66cdcfead8efe56401da171edaf1f2257049aad7b2d3900f6c8",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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{
"file": "ltc4121eud-trpbf-etched.step",
"role": "eda",
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"package_dims": {
"package_code": "UD16",
"source_page": 28,
"D": {
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"metadata": {
"specs": {
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"Package": "QFN-16-EP(3x3)",
"Category": "Power Management ICs",
"Pins": "17"
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"appearance": {
"contacts": {
"quote": "to the IN pin with the shortest copper traces possible.",
"page": 22,
"doc": "ds.pdf",
"material": "copper"
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"characteristics": {
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"source": "datasheet",
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"rows": [
{
"name": "Operating Input Supply Range",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 4.4,
"typ": null,
"max": 40,
"conditions": "",
"source_page": 3,
"source": "datasheet"
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{
"name": "Battery Voltage Range (LTC4121)",
"symbol": "",
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"unit": "V",
"min": 0,
"typ": null,
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"conditions": "LTC4121 (Note 3)",
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{
"name": "DC Supply Current, Switching",
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"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 3.5,
"max": null,
"conditions": "Switching: FREQ = GND",
"source_page": 3,
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{
"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"
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{
"name": "DC Supply Current, Sleep",
"symbol": "IIN",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 60,
"max": 110,
"conditions": "Sleep Mode: 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"
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{
"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": "DUVLO Hysteresis",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 115,
"max": null,
"conditions": "VIN – VBAT Rising, VIN = 5V (LTC4121)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "INTVCC Undervoltage Lockout",
"symbol": "UVINTVCC",
"kind": "electrical",
"unit": "V",
"min": 4,
"typ": 4.15,
"max": 4.26,
"conditions": "INTVCC Rising, VIN = INTVCC + 100mV (Note 5)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "INTVCC UVLO Hysteresis",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 220,
"max": null,
"conditions": "INTVCC Falling",
"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"
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{
"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"
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{
"name": "Feedback Pin Bias Current",
"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 Leakage Current",
"symbol": "IFBG_LEAK",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "Shutdown Mode (Note 4)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Feedback Ground Return Resistance",
"symbol": "RFBG",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": 1000,
"max": 2000,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Feedback Pin Regulation Voltage",
"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)",
"symbol": "VFB(REG)",
"kind": "electrical",
"unit": "V",
"min": 2.37,
"typ": null,
"max": 2.418,
"conditions": "Over operating junction temperature range (Note 6)",
"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",
"symbol": "VRCHG",
"kind": "electrical",
"unit": "mV",
"min": -62,
"typ": -49,
"max": -38,
"conditions": "VFB Falling Relative to VFB(REG) (LTC4121)",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Ratio of BAT Current to PROG Current",
"symbol": "hPROG",
"kind": "electrical",
"unit": "mA/mA",
"min": null,
"typ": 988,
"max": null,
"conditions": "VTRKL < VFB < VFB(REG)",
"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": "CHGSNS-BAT Sense Resistor",
"symbol": "RSNS",
"kind": "electrical",
"unit": "mΩ",
"min": null,
"typ": 300,
"max": null,
"conditions": "IBAT = –100mA",
"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": "Low Battery Threshold Hysteresis",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 147,
"max": null,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Trickle Charge Threshold",
"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": "Trickle Charge Threshold Hysteresis",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 50,
"max": null,
"conditions": "VFB Falling (Note 6)",
"source_page": 4,
"source": "datasheet"
},
{
"name": "End of Charge Indication Current Ratio",
"symbol": "hC/10",
"kind": "electrical",
"unit": "mA/mA",
"min": null,
"typ": 0.1,
"max": null,
"conditions": "(Note 7)",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Safety Timer Termination Period",
"symbol": "",
"kind": "timing",
"unit": "hrs",
"min": 1.3,
"typ": 2,
"max": 2.8,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Bad Battery Termination Timeout",
"symbol": "",
"kind": "timing",
"unit": "min",
"min": 19,
"typ": 30,
"max": 42,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Switching Frequency",
"symbol": "fOSC",
"kind": "electrical",
"unit": "MHz",
"min": 1,
"typ": 1.5,
"max": 2,
"conditions": "FREQ = INTVCC",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Switching Frequency",
"symbol": "fOSC",
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