component
LT3845EFE#TRPBF
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.
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"title": "LT3845EFE#TRPBF",
"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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"manufacturer": "Analog Devices",
"package": "TSSOP-16-EP",
"pin_count": 17,
"category": "Power Management ICs",
"subcategory": "DC-DC Converters",
"datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/3845fd.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; the part operates from a 4V to 60V input range."
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{
"number": "2",
"name": "SHDN",
"type": "input",
"description": "Enable pin with a precision 1.35V rising threshold and 120mV hysteresis; pulling it below about 0.7V enters low-current shutdown, and the pin is internally clamped to 6V with an absolute maximum of 5V."
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{
"number": "3",
"name": "CSS",
"type": "passive",
"description": "Soft-start capacitor pin, where CSS = 2μA(tSS/1.231V) sets the output voltage slew rate, and it should be left unconnected when soft-start is not used."
},
{
"number": "4",
"name": "BURST_EN",
"type": "input",
"description": "Below 0.5V enables Burst Mode operation and reverse-current inhibit, above 0.5V disables Burst Mode while keeping reverse-current inhibit, and connecting it to VCC disables both; absolute maximum is 24V."
},
{
"number": "5",
"name": "VFB",
"type": "input",
"description": "Output voltage feedback input to the inverting input of the error amplifier, which regulates VFB at 1.231V through an external resistive divider; absolute maximum is 5V."
},
{
"number": "6",
"name": "VC",
"type": "passive",
"description": "Error amplifier output that sets the peak switch current per cycle and is typically compensated with an RC network to SGND; it must not be pulled low by a low impedance source and should be driven through a 1kΩ series resistance if externally manipulated."
},
{
"number": "7",
"name": "SYNC",
"type": "input",
"description": "External clock input for synchronizing the oscillator, 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 absolute maximum is 5V."
},
{
"number": "8",
"name": "fSET",
"type": "passive",
"description": "Programs the oscillator frequency with an external resistor RSET, which is required even when an external sync clock is applied."
},
{
"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 sensed inductor current limit is ±100mV across the SENSE inputs and the absolute maximum voltage is 40V."
},
{
"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 sensed inductor current limit is ±100mV across the SENSE inputs and the absolute maximum voltage is 40V."
},
{
"number": "11",
"name": "PGND",
"type": "power_in",
"description": "High-current ground reference for the internal low-side switch driver and the 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 connected with a short, wide (about 0.02 in) PCB trace 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 the high current return for the bootstrapped switch; the absolute maximum switch voltage is 65V to -2V."
},
{
"number": "15",
"name": "TG",
"type": "output",
"description": "Bootstrapped gate drive for the top N-channel MOSFET, to be connected with a short, wide (about 0.02 in) PCB trace to minimize inductance."
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{
"number": "16",
"name": "BOOST",
"type": "power_in",
"description": "Supply for the bootstrapped gate drive, connected to a low ESR ceramic boost capacitor referenced to SW (0.1μF is typical, at least 50 times the top MOSFET gate capacitance); the maximum voltage on this pin is VIN + VCC, ground referred."
},
{
"number": "17",
"name": "SGND",
"type": "power_in",
"description": "Exposed pad and low-noise ground reference, internally connected to the SGND pin, which must be soldered to the PCB ground for electrical and thermal performance and connected to the -VOUT side of the output capacitors."
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"name": "Lead Temperature (Soldering)",
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"min": -40,
"typ": null,
"max": 125,
"conditions": "LT3845E (Note 3)",
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{
"name": "Thermal resistance, junction to ambient (FE TSSOP)",
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"unit": "°C/W",
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"name": "Error Amp Reference Voltage (measured at VFB pin)",
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"min": 1.224,
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{
"name": "SHDN Enable Threshold (Rising)",
"symbol": "VSHDN",
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"unit": "V",
"min": 1.3,
"typ": 1.35,
"max": 1.4,
"conditions": "Over full operating temperature range",
"source_page": 3,
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{
"name": "Sense Pins Common Mode Range",
"symbol": "VSENSE(CM)",
"kind": "electrical",
"unit": "V",
"min": 0,
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"name": "Current Limit Sense Voltage",
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"name": "Operating Frequency",
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"name": "Maximum Programmable Frequency",
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"name": "Error Amp Transconductance",
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"min": 270,
"typ": 340,
"max": 410,
"conditions": "Over full operating temperature range",
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"name": "Error Amp Sink/Source Current",
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"min": -30,
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"name": "Minimum TG Off Time",
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"name": "VCC Output Voltage",
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"min": 8,
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