component
LT3905EUD#TRPBF
Public Made by Adomby adom
Analog Devices DC-DC Converters, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"number": "1",
"name": "ILIM",
"type": "output",
"description": "Open-drain overload indicator that pulls low when ILIM_MON reaches the 1.348V threshold and releases when ILIM_MON drops by 50mV; max recommended sink current is 2mA, leave open if unused."
},
{
"number": "2",
"name": "LOS_MON",
"type": "output",
"description": "Loss-of-signal monitor that sources 10% of the APD current, is the positive input of the LOS comparator, is clamped to 2.25V, and needs a resistor to GND (tie to GND if unused)."
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{
"number": "3",
"name": "ILIM_MON",
"type": "output",
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{
"number": "4",
"name": "MON",
"type": "output",
"description": "Current monitor output that sources 20% of the APD current, clamped to 2.25V, with a resistor to GND setting the monitor gain."
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{
"number": "5",
"name": "APD",
"type": "output",
"description": "APD cathode connection; the maximum current of this pin is 7mA (typ)."
},
{
"number": "6",
"name": "MONIN",
"type": "power_in",
"description": "Power supply for the APD and all current monitors, connected to VOUT through an external lowpass filter for lowest noise (65V absolute maximum)."
},
{
"number": "7",
"name": "SW",
"type": "passive",
"description": "Switch pin, drain of the internal power FET and anode of the internal Schottky, connected to the switching side of the inductor with minimal trace length (65V absolute maximum)."
},
{
"number": "8",
"name": "VOUT",
"type": "power_out",
"description": "Boost converter output, cathode of the internal power Schottky, with an output smoothing capacitor to GND (65V absolute maximum)."
},
{
"number": "9",
"name": "GND",
"type": "power_in",
"description": "Ground, tied to the exposed pad."
},
{
"number": "10",
"name": "VIN",
"type": "power_in",
"description": "Input supply pin for 2.7V to 12V operation, bypassed with a capacitor to GND as close to the IC as possible."
},
{
"number": "11",
"name": "EN/UVLO",
"type": "input",
"description": "Master enable and VIN undervoltage lockout with 1.2V threshold, 25mV internal hysteresis and 3µA hysteresis current; shutdown current is <1µA when low, or drive with a digital signal above 1.5V."
},
{
"number": "12",
"name": "CTRL",
"type": "input",
"description": "External reference input to the FB error amp when below 1.248V; tie to VIN if unused."
},
{
"number": "13",
"name": "LOS",
"type": "output",
"description": "Open-drain loss-of-signal indicator that goes high when LOS_MON is below LOS_ADJ; max recommended sink current is 2mA, leave open if unused."
},
{
"number": "14",
"name": "LOS_ADJ",
"type": "input",
"description": "External reference input for the loss-of-signal comparator with 20mV internal hysteresis; tie to VIN for a fixed 1.248V threshold or if unused."
},
{
"number": "15",
"name": "FB",
"type": "input",
"description": "Feedback pin connected to a resistor divider between VOUT and GND with a 1.248V internal reference; pull above 1.8V to disable the step-up converter."
},
{
"number": "16",
"name": "fSEL",
"type": "input",
"description": "Frequency selector: tie to VIN for 2MHz operation or to GND for 1MHz operation."
},
{
"number": "17",
"name": "GND",
"type": "power_in",
"description": "Exposed pad, ground, must be soldered to a large PCB copper area for proper functionality and heat sinking."
}
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"at": "2026-10-30T21:04:37"
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"url": "https://www.analog.com/media/en/technical-documentation/data-sheets/3905fa.pdf",
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"Package": "QFN-16-EP(3x3)",
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"rows": [
{
"name": "Operating Voltage Range",
"symbol": "VIN",
"kind": "electrical",
"unit": "V",
"min": 2.7,
"typ": null,
"max": 12,
"conditions": "",
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"name": "Feedback Voltage",
"symbol": "VFB",
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"min": 1.238,
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"max": 1.258,
"conditions": "VCTRL = 1.5V",
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"name": "Feedback Voltage (full temp range)",
"symbol": "VFB",
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{
"name": "FB Standby Threshold",
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"min": 1.65,
"typ": 1.8,
"max": 1.95,
"conditions": "VFB Rising",
"source_page": 3,
"source": "datasheet"
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{
"name": "CTRL to FB Offset",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": -13,
"typ": 0,
"max": 13,
"conditions": "VCTRL = 0.5V",
"source_page": 3,
"source": "datasheet"
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{
"name": "CTRL Input Bias Current",
"symbol": "",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 15,
"max": 75,
"conditions": "Current Out of Pin, VCTRL = 0.5V",
"source_page": 3,
"source": "datasheet"
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{
"name": "MON Pin Voltage Clamp",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 2.35,
"typ": null,
"max": 2.5,
"conditions": "IAPD = 300µA, RMON = Open",
"source_page": 3,
"source": "datasheet"
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{
"name": "LOS_MON Pin Voltage Clamp",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 2.35,
"typ": null,
"max": 2.5,
"conditions": "IAPD = 300µA, RLOS_MON = Open",
"source_page": 3,
"source": "datasheet"
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{
"name": "LOS_MON Pin Bias Current",
"symbol": "",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 10,
"max": 50,
"conditions": "Current Out of Pin, IAPD = 0A, VLOS_MON = 1V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "ILIM_MON Pin Bias Current",
"symbol": "",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 35,
"max": 175,
"conditions": "Current Out of Pin, IAPD = 0A, VILIM_MON = 1V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "APD Monitor (MON) Current Gain",
"symbol": "",
"kind": "electrical",
"unit": "",
"min": 0.185,
"typ": 0.2,
"max": 0.215,
"conditions": "300nA ≤ IAPD ≤ 3µA, 12V ≤ MONIN ≤ 65V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "APD Monitor (MON) Current Gain",
"symbol": "",
"kind": "electrical",
"unit": "",
"min": 0.196,
"typ": 0.2,
"max": 0.204,
"conditions": "3µA ≤ IAPD ≤ 3mA, 12V ≤ MONIN ≤ 65V",
"source_page": 3,
"source": "datasheet"
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{
"name": "LOS_MON Current Gain",
"symbol": "",
"kind": "electrical",
"unit": "",
"min": 0.092,
"typ": 0.1,
"max": 0.108,
"conditions": "3µA ≤ IAPD ≤ 30µA, 12V ≤ MONIN ≤ 65V",
"source_page": 3,
"source": "datasheet"
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{
"name": "LOS_MON Current Gain",
"symbol": "",
"kind": "electrical",
"unit": "",
"min": 0.096,
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"conditions": "30µA ≤ IAPD ≤ 3mA, 12V ≤ MONIN ≤ 65V",
"source_page": 3,
"source": "datasheet"
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{
"name": "ILIM_MON Current Gain",
"symbol": "",
"kind": "electrical",
"unit": "",
"min": 0.045,
"typ": 0.05,
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"conditions": "30µA ≤ IAPD ≤ 300µA, 12V ≤ MONIN ≤ 65V",
"source_page": 3,
"source": "datasheet"
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{
"name": "ILIM_MON Current Gain",
"symbol": "",
"kind": "electrical",
"unit": "",
"min": 0.048,
"typ": 0.05,
"max": 0.052,
"conditions": "300µA ≤ IAPD ≤ 3mA, 12V ≤ MONIN ≤ 65V",
"source_page": 3,
"source": "datasheet"
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{
"name": "APD Monitor Voltage Drop",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 3.7,
"typ": 3.95,
"max": 4.2,
"conditions": "MONIN – APD at IAPD = 3mA, MONIN = 65V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Switching Frequency",
"symbol": "",
"kind": "electrical",
"unit": "MHz",
"min": 0.9,
"typ": 1,
"max": 1.1,
"conditions": "fSEL = 0V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Switching Frequency",
"symbol": "",
"kind": "electrical",
"unit": "MHz",
"min": 1.8,
"typ": 2,
"max": 2.2,
"conditions": "fSEL = 2V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Maximum Duty Cycle",
"symbol": "",
"kind": "electrical",
"unit": "%",
"min": 90,
"typ": 95,
"max": null,
"conditions": "fSEL = 0V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Maximum Duty Cycle",
"symbol": "",
"kind": "electrical",
"unit": "%",
"min": 80,
"typ": 90,
"max": null,
"conditions": "fSEL = 2V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Switch Current Limit",
"symbol": "",
"kind": "electrical",
"unit": "mA",
"min": 350,
"typ": 400,
"max": 450,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Switch Leakage Current",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.1,
"max": 3,
"conditions": "SW = 65V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Schottky Reverse Leakage",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 3,
"conditions": "VOUT – SW = 65V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Loss of Signal Comparator Internal Threshold",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 1.185,
"typ": 1.248,
"max": 1.31,
"conditions": "LOS_ADJ = 1.5V, LOS_MON Falling",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Loss of Signal Comparator External Threshold",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 0.95,
"typ": null,
"max": 1.05,
"conditions": "LOS_ADJ = 1.0V, LOS_MON Falling",
"source_page": 3,
"source": "datasheet"
},
{
"name": "ILIM_MON Voltage Regulation Threshold",
"symbol": "VIFB",
"kind": "electrical",
"unit": "V",
"min": 1.223,
"typ": 1.248,
"max": 1.273,
"conditions": "VFB = 0.5V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ILIM_MON Voltage Regulation Threshold (full temp)",
"symbol": "VIFB",
"kind": "electrical",
"unit": "V",
"min": 1.211,
"typ": null,
"max": 1.285,
"conditions": "VFB = 0.5V, full operating temperature range",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ILIM_MON APD Current Limit Threshold",
"symbol": "VILIM",
"kind": "electrical",
"unit": "V",
"min": 1.323,
"typ": 1.348,
"max": 1.373,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ILIM_MON APD Current Limit Threshold (full temp)",
"symbol": "VILIM",
"kind": "electrical",
"unit": "V",
"min": 1.311,
"typ": null,
"max": 1.385,
"conditions": "full operating temperature range",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ILIM_MON APD Current Limit Line Regulation",
"symbol": "",
"kind": "electrical",
"unit": "µA/V",
"min": null,
"typ": null,
"max": 10,
"conditions": "VAPD = 0V, ∆IAPD/∆VMONIN, 5V < VMONIN < 65V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ILIM_MON Indicator Threshold",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": -30,
"typ": -10,
"max": -2,
"conditions": "VILIM_MON Rising; printed as VILIM – 30 / – 10 / – 2 mV",
"source_page": 4,
"source": "datasheet"
},
{
"name": "EN/UVLO Threshold",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 1.128,
"typ": 1.2,
"max": 1.272,
"conditions": "VENUVLO Falling",
"source_page": 4,
"source": "datasheet"
},
{
"name": "EN/UVLO Threshold (full temp)",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 1.104,
"typ": 1.2,
"max": 1.296,
"conditions": "VENUVLO Falling, full operating temperature range",
"source_page": 4,
"source": "datasheet"
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