component
LT3845AEFE#PBF
Public Made by Adomby adom
Analog Devices DC-DC Converters, TSSOP-16-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"brief": "Analog Devices DC-DC Converters, TSSOP-16-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"package": "TSSOP-16-EP",
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"category": "Power Management ICs",
"subcategory": "DC-DC Converters",
"datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/3845afa.pdf",
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"number": "1",
"name": "VIN",
"type": "power_in",
"description": "Main supply pin, to be decoupled to SGND with a low ESR capacitor of at least 0.1µF located close to the pin; absolute maximum VIN is 65V and the operating range is 4V to 60V."
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{
"number": "2",
"name": "SHDN",
"type": "input",
"description": "Precision enable pin with a 1.35V rising threshold and 120mV hysteresis for UVLO; pulling it below 0.7V enters low-current shutdown, the pin is clamped to 6V, and its voltage rating is 5V with 1mA maximum pin current."
},
{
"number": "3",
"name": "CSS",
"type": "passive",
"description": "Soft-start capacitor pin, where CSS = 2µA(tSS/1.231V) sets the output voltage slew rate; leave unconnected when soft-start is not used, and the voltage rating is 5V."
},
{
"number": "4",
"name": "BURST_EN",
"type": "input",
"description": "Burst Mode enable pin where below 0.5V enables Burst Mode and reverse-current inhibit, above 0.5V disables Burst Mode, and reverse-current inhibit is disabled above 2.5V; the pin is rated 24V."
},
{
"number": "5",
"name": "VFB",
"type": "input",
"description": "Output voltage feedback input connected to the supply output through a resistive divider, regulating at 1.231V, with a voltage rating of 5V."
},
{
"number": "6",
"name": "VC",
"type": "passive",
"description": "Error amplifier output that sets the peak switch current and must not be pulled low by a low impedance source; if externally manipulated it must be driven through a 1kΩ series resistance, and the voltage rating is 5V."
},
{
"number": "7",
"name": "SYNC",
"type": "input",
"description": "External clock input for oscillator synchronization, with RSET set so the internal oscillator runs 10% to 25% below the external clock within a 100kHz to 600kHz sync range; connect to SGND if unused, and the voltage rating is 5V."
},
{
"number": "8",
"name": "fSET",
"type": "passive",
"description": "Oscillator frequency programming pin set by external resistor RSET, which is required even when an external sync clock is supplied; the programmable range is 100kHz to 500kHz."
},
{
"number": "9",
"name": "SENSE–",
"type": "input",
"description": "Negative input of the current sense amplifier, connected to the VOUT side of the sense resistor in step-down applications; the pin is rated 40V and the differential sense voltage is limited to ±1V."
},
{
"number": "10",
"name": "SENSE+",
"type": "input",
"description": "Positive input of the current sense amplifier, connected to the inductor side of the sense resistor in step-down applications; the pin is rated 40V."
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{
"number": "11",
"name": "PGND",
"type": "power_in",
"description": "High-current ground reference for the internal low-side switch driver and VCC regulator, to be connected directly to the negative terminal of the VCC decoupling capacitor."
},
{
"number": "12",
"name": "BG",
"type": "output",
"description": "Gate drive for the bottom N-channel MOSFET, to be routed with a short and wide trace (typically 0.02 in) to minimize inductance."
},
{
"number": "13",
"name": "VCC",
"type": "power_out",
"description": "Internal bias supply decoupling node that requires a low ESR ceramic capacitor of 1µF or greater to PGND; the absolute maximum rating is 24V."
},
{
"number": "14",
"name": "SW",
"type": "passive",
"description": "Reference for the VBOOST supply and high-current return for the bootstrapped switch; the switch voltage rating is 65V to -2V."
},
{
"number": "15",
"name": "TG",
"type": "output",
"description": "Bootstrapped gate drive for the top N-channel MOSFET, to be routed with a short and wide trace (typically 0.02 in) to minimize inductance."
},
{
"number": "16",
"name": "BOOST",
"type": "power_out",
"description": "Bootstrap supply for the gate drive, connected to a low ESR ceramic boost capacitor referenced to SW (0.1µF is typical); the maximum voltage seen is VIN + VCC, the BOOST-to-SW differential is limited to 24V, and the absolute maximum is 80V."
},
{
"number": "17",
"name": "SGND",
"type": "power_in",
"description": "Exposed pad internally connected to the SGND low noise ground reference, which should be connected to the -VOUT side of the output capacitors and soldered to the PCB ground for thermal performance."
}
],
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"4/17 pins cited to the wrong page (name found elsewhere): ['13:VCC@p8', '14:SW@p8', '15:TG@p8', '17:SGND@p8']"
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"Package": "TSSOP-16-EP",
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{
"name": "Operating junction temperature range (LT3845AE)",
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"name": "Storage temperature",
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"unit": "°C",
"min": -65,
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"source": "datasheet"
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{
"name": "Lead temperature (soldering)",
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"max": 300,
"conditions": "Soldering, 10 sec",
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"name": "Maximum junction temperature",
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"min": null,
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"source": "datasheet"
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{
"name": "Junction-to-ambient thermal resistance",
"symbol": "θJA",
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"unit": "°C/W",
"min": null,
"typ": 40,
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"name": "Junction-to-case thermal resistance",
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{
"name": "VIN operating voltage range",
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"name": "VIN minimum start voltage",
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{
"name": "VIN UVLO threshold (falling)",
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"name": "VIN UVLO threshold hysteresis",
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{
"name": "VIN Burst Mode current",
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"conditions": "VBURST_EN = 0V, VFB = 1.35V",
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"source": "datasheet"
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{
"name": "VIN shutdown current",
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"typ": 9,
"max": 15,
"conditions": "VSHDN = 0V",
"source_page": 3,
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{
"name": "BOOST operating voltage range",
"symbol": "VBOOST – VSW",
"kind": "electrical",
"unit": "V",
"min": 5,
"typ": null,
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{
"name": "BOOST supply current",
"symbol": "",
"kind": "electrical",
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"min": null,
"typ": 1.4,
"max": null,
"conditions": "Note 6",
"source_page": 3,
"source": "datasheet"
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{
"name": "BOOST Burst Mode current",
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{
"name": "BOOST shutdown current",
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"conditions": "VSHDN = 0V",
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"source": "datasheet"
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{
"name": "VCC operating voltage range",
"symbol": "VCC",
"kind": "electrical",
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"min": 8,
"typ": null,
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"conditions": "Note 5",
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{
"name": "VCC supply current",
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{
"name": "VCC Burst Mode current",
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"conditions": "VBURST_EN = 0V",
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{
"name": "VCC shutdown current",
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"unit": "µA",
"min": null,
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"max": null,
"conditions": "VSHDN = 0V",
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{
"name": "Error amp reference voltage (full temperature range)",
"symbol": "",
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"min": 1.215,
"typ": 1.231,
"max": 1.245,
"conditions": "Measured at VFB pin; l = full operating temperature range",
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{
"name": "Error amp reference voltage (TA = 25°C)",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 1.224,
"typ": 1.231,
"max": 1.238,
"conditions": "TA = 25°C; measured at VFB pin",
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{
"name": "VFB pin input current",
"symbol": "IVFB",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 25,
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"conditions": "VFB = 1.231V",
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{
"name": "SHDN enable threshold (rising)",
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"min": 1.3,
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{
"name": "Sense pins common mode range",
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"min": 0,
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"name": "Current limit sense voltage",
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"min": 90,
"typ": 100,
"max": 115,
"conditions": "VBURST_EN = VCC",
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{
"name": "Reverse protect sense voltage",
"symbol": "VSENSE+ – VSENSE–",
"kind": "electrical",
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"min": null,
"typ": -100,
"max": null,
"conditions": "VBURST_EN = VCC",
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{
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"kind": "electrical",
"unit": "mV",
"min": null,
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"max": null,
"conditions": "VBURST_EN = 0V or VBURST_EN = VFB",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Input current (ISENSE+ + ISENSE–)",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 800,
"max": null,
"conditions": "VSENSE(CM) = 0V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Input current (ISENSE+ + ISENSE–)",
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"kind": "electrical",
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"min": null,
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"max": null,
"conditions": "VSENSE(CM) = 2V",
"source_page": 3,
"source": "datasheet"
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