component
LT8471EFE#TRPBF
Public Made by Adomby adom
Analog Devices DC-DC Converters, HTSSOP-20-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, HTSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"manufacturer": "Analog Devices",
"package": "HTSSOP-20-EP",
"pin_count": 21,
"category": "Power Supply Chip",
"subcategory": "DC-DC Converters",
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"digikey": "LT8471EFE#TRPBFTR-ND",
"mouser": "584-LT8471EFE#TRPBF"
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"number": "1",
"name": "C1",
"type": "output",
"description": "Collector of the primary channel 1 internal NPN power switch; if tied to a DC voltage it must be locally bypassed, and if it is a switching pin its trace area must be minimized to reduce EMI."
},
{
"number": "2",
"name": "E1",
"type": "passive",
"description": "Emitter of the primary channel 1 internal NPN power switch; unless grounded, its trace area must be minimized to reduce EMI."
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{
"number": "3",
"name": "VIN1",
"type": "power_in",
"description": "Input supply 1 for primary channel 1 and the Skyhook channel, which also powers common circuitry; VIN1 must be greater than 2.6V for any channel to operate and must be locally bypassed."
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{
"number": "4",
"name": "PG1",
"type": "output",
"description": "Open-drain power-good output for channel 1 that is pulled low when the output is more than 7.5% below target and released when the output is above 92.5% of target, requiring an external pull-up resistor."
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{
"number": "5",
"name": "FB1",
"type": "input",
"description": "Feedback pin for primary channel 1, where a resistor divider between VOUT, FB and GND sets the output voltage."
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{
"number": "6",
"name": "OV/UV",
"type": "input",
"description": "Overvoltage/undervoltage pin that must be tied to 1.215V (typical) or more to enable the device and grounded to shut down, and can be configured as UVLO and OVLO through an external resistor divider."
},
{
"number": "7",
"name": "RT",
"type": "passive",
"description": "Timing resistor pin that sets the free-running switching frequency through a resistor to ground and must not be left floating."
},
{
"number": "8",
"name": "SS1",
"type": "passive",
"description": "Soft-start pin for channel 1 that takes a soft-start capacitor and is charged nominally through 250k to about 2.15V at start-up."
},
{
"number": "9",
"name": "SYNC",
"type": "input",
"description": "Synchronization input that accepts an external clock with a high level above 1.3V and a low level below 0.4V, and reverts to the internal free-running clock when driven below 0.4V."
},
{
"number": "10",
"name": "GND",
"type": "power_in",
"description": "Ground pin that must be soldered directly to the local ground plane."
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{
"number": "11",
"name": "GND",
"type": "power_in",
"description": "Ground pin that must be soldered directly to the local ground plane."
},
{
"number": "12",
"name": "GND",
"type": "power_in",
"description": "Ground pin that must be soldered directly to the local ground plane."
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{
"number": "13",
"name": "C3",
"type": "output",
"description": "Collector of the Skyhook channel internal NPN power switch; if the Skyhook channel is not used this pin must be tied to GND, and if used its metal trace area must be minimized to reduce EMI."
},
{
"number": "14",
"name": "SHOUT",
"type": "output",
"description": "Skyhook output voltage pin that is the cathode of the internal Schottky diode and the output of the Skyhook boost converter."
},
{
"number": "15",
"name": "SS2",
"type": "passive",
"description": "Soft-start pin for channel 2 that takes a soft-start capacitor and is charged nominally through 250k to about 2.15V at start-up."
},
{
"number": "16",
"name": "FB2",
"type": "input",
"description": "Feedback pin for primary channel 2, where a resistor divider between VOUT, FB and GND sets the output voltage."
},
{
"number": "17",
"name": "PG2",
"type": "output",
"description": "Open-drain power-good output for channel 2 that is pulled low when the output is more than 7.5% below target and released when the output is above 92.5% of target, requiring an external pull-up resistor."
},
{
"number": "18",
"name": "VIN2",
"type": "power_in",
"description": "Input supply 2 for primary channel 2 that must be greater than 2.6V when channel 2 is in use and must be locally bypassed."
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{
"number": "19",
"name": "E2",
"type": "passive",
"description": "Emitter of the primary channel 2 internal NPN power switch; unless grounded, its trace area must be minimized to reduce EMI."
},
{
"number": "20",
"name": "C2",
"type": "output",
"description": "Collector of the primary channel 2 internal NPN power switch that must be tied to the Skyhook channel input voltage when the Skyhook channel is used, and must be bypassed or have its trace minimized as for C1."
},
{
"number": "21",
"name": "GND",
"type": "power_in",
"description": "Exposed pad that is ground, must be soldered to the PCB, and provides both electrical contact to ground and thermal contact to the board."
}
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"at": "2026-10-21T01:30:52"
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"specs": {
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"Package": "HTSSOP-20-EP",
"Category": "Power Supply Chip",
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"appearance": {
"contacts": {
"quote": "switching pins small. Board layout also has a significant effect on thermal resistance. The exposed package ground pad is the copper",
"page": 25,
"doc": "ds.pdf",
"material": "copper"
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"name": "Input Voltage (VIN1, VIN2)",
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"name": "Quiescent Current (VIN2)",
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"conditions": "VOV/UV = 1.3V, Not Switching",
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"name": "Quiescent Current in Shutdown (VIN1 + VIN2)",
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{
"name": "Negative Feedback Voltage (FB1, FB2)",
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"min": -806,
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{
"name": "Feedback Pin Bias Current (FB1, FB2)",
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"unit": "nA",
"min": -100,
"typ": 30,
"max": 200,
"conditions": "VFB = Positive Feedback Voltage, Current Out of Pin",
"source_page": 3,
"source": "datasheet"
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{
"name": "Feedback Pin Bias Current (FB1, FB2)",
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"conditions": "VFB = Negative Feedback Voltage",
"source_page": 3,
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{
"name": "Reference Line Regulation",
"symbol": "",
"kind": "electrical",
"unit": "%/V",
"min": null,
"typ": 0.008,
"max": 0.05,
"conditions": "2.6V ≤ VIN1 ≤ 50V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Switching Frequency, fOSC",
"symbol": "fOSC",
"kind": "electrical",
"unit": "MHz",
"min": 1.55,
"typ": 1.8,
"max": 2.05,
"conditions": "RT = 46.4k",
"source_page": 3,
"source": "datasheet"
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{
"name": "Switching Frequency, fOSC",
"symbol": "fOSC",
"kind": "electrical",
"unit": "kHz",
"min": 100,
"typ": 117,
"max": 135,
"conditions": "RT = 732k",
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{
"name": "Switching Frequency Range Synchronizing",
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"min": 100,
"typ": null,
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{
"name": "SYNC High Level for Sync",
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"min": 1.3,
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"source_page": 3,
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{
"name": "SYNC Low Level for Sync",
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"min": null,
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"max": 0.4,
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{
"name": "SYNC Clock Pulse Duty Cycle",
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"min": 35,
"typ": null,
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"conditions": "VSYNC = 0V to 2V",
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"source": "datasheet"
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{
"name": "Switching Phase Between Primary Channels",
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"kind": "electrical",
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"min": 170,
"typ": null,
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"conditions": "RT = 46.4k",
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{
"name": "Skyhook Boost Voltage",
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"kind": "electrical",
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"min": 3,
"typ": 4.25,
"max": 5.4,
"conditions": "VSHOUT – VC2, Skyhook Enabled",
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{
"name": "Switch Current Limit (Primary Channels)",
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"source": "datasheet"
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{
"name": "Switch Current Limit (Primary Channels)",
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{
"name": "Switch Current Limit (Skyhook)",
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"min": 400,
"typ": 500,
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{
"name": "C1, C2 Leakage Current",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.01,
"max": 1,
"conditions": "VC1 = VC2 = 12V, VE1 = VE2 = 0V, VOV/UV = 0V, Current into Pin",
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"source": "datasheet"
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{
"name": "C3 Leakage Current",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.01,
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"conditions": "VC3 = 12V, VOV/UV = 0V",
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{
"name": "E1, E2 Leakage Current",
"symbol": "",
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"max": 1,
"conditions": "VOV/UV = 0V, Current Out of Pin, VC1 = VC2 = 20V, VE1 = VE2 = 5V",
"source_page": 4,
"source": "datasheet"
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{
"name": "Schottky Reverse Leakage",
"symbol": "VREVERSE",
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"min": null,
"typ": 0.01,
"max": 1,
"conditions": "VREVERSE = 12V",
"source_page": 4,
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{
"name": "Schottky Reverse Leakage",
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"min": null,
"typ": 0.02,
"max": 2,
"conditions": "VREVERSE = 50V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Soft-Start Charge Current",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": 5.5,
"typ": 8.5,
"max": 11.5,
"conditions": "VSS1, VSS2 = 50mV, Current Flows Out of SS1, SS2 Pins",
"source_page": 4,
"source": "datasheet"
},
{
"name": "OV/UV Current for OVLO",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": 76,
"typ": 80,
"max": 84,
"conditions": "Current into OV/UV Pin. VOV/UV Internally Clamped to 1.37V, Current Rising",
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{
"name": "OV/UV Pin Bias Current",
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},
{
"name": "OV/UV Minimum Input Voltage High",
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"kind": "electrical",
"unit": "V",
"min": 1.165,
"typ": 1.215,
"max": 1.265,
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{
"name": "OV/UV Minimum Input Voltage Low",
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"typ": 1.18,
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"conditions": "Active Mode, OV/UV Falling",
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{
"name": "OV/UV Input Voltage Low",
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"kind": "electrical",
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"min": null,
"typ": null,
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"conditions": "Shutdown Mode",
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},
{
"name": "FB Pin Threshold for Power Good (Positive Output Voltage)",
"symbol": "",
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"unit": "mV",
"min": 715,
"typ": 740,
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"conditions": "FB Rising",
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{
"name": "FB Pin Threshold for Power Good (Positive Output Voltage)",
"symbol": "",
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"unit": "mV",
"min": 708,
"typ": 730,
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"conditions": "FB Falling",
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{
"name": "FB Pin Threshold for Power Good (Negative Output Voltage)",
"symbol": "",
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"unit": "mV",
"min": -766,
"typ": -736,
"max": -706,
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},
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