component
A4405KLPTR-T
Public Made by Adomby adom
Allegro MicroSystems, LLC Linear Voltage Regulators (LDO), TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "A4405KLPTR-T",
"brief": "Allegro MicroSystems, LLC Linear Voltage Regulators (LDO), TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"package": "TSSOP-20",
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"subcategory": "Linear Voltage Regulators (LDO)",
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"digikey": "620-A4405KLPTR-TTR-ND",
"mouser": "250-A4405KLPTR-T"
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"pins": [
{
"number": "1",
"name": "VIN",
"type": "power_in",
"description": "Input voltage with a 5.5 to 36 V operating range and a 50 V absolute maximum for surges."
},
{
"number": "2",
"name": "GND",
"type": "power_in",
"description": "Ground terminal."
},
{
"number": "3",
"name": "TON",
"type": "input",
"description": "Buck regulator on-time programming pin, characterized with RTON = 412 kΩ."
},
{
"number": "4",
"name": "ENBAT",
"type": "input",
"description": "Ignition enable input from the key or switch via a 1 kΩ series resistor, with VIGN(H) of 4.0 V maximum and VIGN(L) of 2.2 V minimum."
},
{
"number": "5",
"name": "ENB",
"type": "input",
"description": "Logic enable input from the microcontroller, with VENB(H) of 2.0 V maximum and VENB(L) of 0.8 V minimum."
},
{
"number": "6",
"name": "ENBATS",
"type": "output",
"description": "Open-drain ignition status output, with VENBATS(L) of 400 mV maximum at 4 mA."
},
{
"number": "7",
"name": "NPOR",
"type": "output",
"description": "Active-low, open-drain fault indication output, with a low level of 400 mV maximum at 4 mA in the specified enable states."
},
{
"number": "8",
"name": "CPOR",
"type": "passive",
"description": "NPOR delay programming pin, with a charge current of about −13 µA and a rising threshold of 1.0 to 1.4 V."
},
{
"number": "9",
"name": "V5",
"type": "power_out",
"description": "5 V regulator output, accurate to 4.9 to 5.1 V for a 10 to 215 mA load when VVREG is at least 5.25 V."
},
{
"number": "10",
"name": "V5P",
"type": "power_out",
"description": "5 V tracking, short-to-battery protected regulator output, accurate to 4.9 to 5.1 V for a 10 to 270 mA load; protection diodes are required when driving a long harness or trace."
},
{
"number": "11",
"name": "V33",
"type": "power_out",
"description": "3.3 V regulator output, accurate to 3.23 to 3.37 V for a 10 to 500 mA load."
},
{
"number": "12",
"name": "G33",
"type": "output",
"description": "Gate driver to the external MOSFET for 3.3 V regulation, with a maximum gate voltage of 9 to 15 V when VV33 is 3.0 V."
},
{
"number": "13",
"name": "CLV33",
"type": "input",
"description": "3.3 V current sense and limit input, with a V33 overcurrent threshold of 175 to 245 mV between VREG and CLV33."
},
{
"number": "14",
"name": "VREG",
"type": "power_out",
"description": "Buck regulator DC output at 5.25 to 5.60 V, also serving as the input to the 3.3 V external regulator."
},
{
"number": "15",
"name": "ISEN–",
"type": "input",
"description": "Buck negative current sense pin at the sense resistor and diode node, with a VISEN threshold of 175 to 265 mV."
},
{
"number": "16",
"name": "ISEN+",
"type": "input",
"description": "Buck positive current sense pin at the sense resistor and ground node."
},
{
"number": "17",
"name": "LX",
"type": "output",
"description": "Buck regulator switching node."
},
{
"number": "18",
"name": "CP1",
"type": "passive",
"description": "Charge pump capacitor terminal 1."
},
{
"number": "19",
"name": "CP2",
"type": "passive",
"description": "Charge pump capacitor terminal 2."
},
{
"number": "20",
"name": "VCP",
"type": "power_out",
"description": "Charge pump reservoir capacitor terminal, with VVCP specified at 4.1 to 6.6 V above VIN."
}
],
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"guards": "pin_guards 0.1: passed",
"guard_notes": [
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],
"pages_sent": 7,
"cost_usd": 0.0556,
"at": "2026-10-29T04:03:33"
},
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"pages": 27,
"sha256": "ac41eeb6d8c7b5ac",
"source_tier": "lcsc"
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"cad": "KiCad official (CC-BY-SA 4.0)",
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"described": 20,
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"metadata": {
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"Package": "TSSOP-20",
"Category": "Power Supply Chip",
"Pins": "20"
},
"appearance": {
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"plating": "tin"
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"name": "VIN Pin",
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"unit": "V",
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"conditions": "",
"source_page": 2,
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{
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"name": "VCP, CP1, and CP2 Pins",
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{
"name": "ISEN– Pin",
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{
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{
"name": "ENBAT Pin",
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"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "ENBAT Pin Current",
"symbol": "IENBAT",
"kind": "absolute_maximum",
"unit": "mA",
"min": -50,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "VREG Pin",
"symbol": "VVREG",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 8,
"conditions": "",
"source_page": 2,
"source": "datasheet"
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{
"name": "V33 Pin",
"symbol": "VV33",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 2,
"source": "datasheet"
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{
"name": "G33 Pin",
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"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "CLV33 Pin",
"symbol": "VCLV33",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "V5P Pin",
"symbol": "VV5P",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "V5 Pin",
"symbol": "VV5",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 2,
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},
{
"name": "TON Pin",
"symbol": "VTON",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "NPOR and CPOR Pins",
"symbol": "VxPOR",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "ENB and ENBATS Pins",
"symbol": "VEN, VENBATS",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Operating Ambient Temperature, range K",
"symbol": "TA",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 135,
"conditions": "",
"source_page": 2,
"source": "datasheet"
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{
"name": "Junction Temperature",
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"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
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"source_page": 2,
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{
"name": "Storage Temperature Range",
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"min": -40,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Package Thermal Resistance",
"symbol": "RθJA",
"kind": "thermal",
"unit": "ºC/W",
"min": null,
"typ": 32,
"max": null,
"conditions": "Estimated on 4-layer PCB based on JEDEC standard",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Operating Input Voltage",
"symbol": "VIN(op)",
"kind": "recommended_operating",
"unit": "V",
"min": 5.5,
"typ": 13.5,
"max": 36,
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{
"name": "Function Input Voltage",
"symbol": "VIN(f)",
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"min": 5.5,
"typ": null,
"max": 46,
"conditions": "Device functional, parameters not guaranteed",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Supply Quiescent Current (sleep)",
"symbol": "IQ(SLEEP)",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 10,
"conditions": "VIN = 13.5 V, VIGN < VIGN(L), VENB < VENB(L), no load on VREG",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher Output",
"symbol": "VVREG",
"kind": "electrical",
"unit": "V",
"min": 5.25,
"typ": 5.45,
"max": 5.6,
"conditions": "ENB = high, VINSW(L) < VIN < 27 V, 25 mA < IVREG < 600 mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher Output",
"symbol": "VVREG",
"kind": "electrical",
"unit": "V",
"min": 5.3,
"typ": 5.45,
"max": 5.6,
"conditions": "ENB = high, VINSW(NOM) < VIN < 27 V, 25 mA < IVREG <750 mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher Output",
"symbol": "VVREG",
"kind": "electrical",
"unit": "V",
"min": 5.15,
"typ": null,
"max": 6.46,
"conditions": "ENB = high, 5.5 V < VIN < 6.5 V, LX 100% on, 100 mA < IVREG < 600 mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher On-Time",
"symbol": "tON",
"kind": "electrical",
"unit": "ns",
"min": 1070,
"typ": 1335,
"max": 1600,
"conditions": "VIN = 7 V, RTON = 412 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher On-Time",
"symbol": "tON",
"kind": "electrical",
"unit": "ns",
"min": 160,
"typ": 200,
"max": 240,
"conditions": "VIN = 13.5 V, RTON = 412 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher On-Time",
"symbol": "tON",
"kind": "electrical",
"unit": "ns",
"min": 80,
"typ": 118,
"max": 135,
"conditions": "VIN = 27 V, RTON = 412 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher On-Time",
"symbol": "tON",
"kind": "electrical",
"unit": "ns",
"min": 220,
"typ": 275,
"max": 330,
"conditions": "VIN = 35 V, RTON = 412 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher Period VIN Threshold",
"symbol": "VINSW(L)",
"kind": "electrical",
"unit": "V",
"min": 5.9,
"typ": 6.2,
"max": 6.5,
"conditions": "VIN falling, TSW changes from TSW(L) to 100% duty cycle",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher Period VIN Threshold",
"symbol": "VINSW(NOM)",
"kind": "electrical",
"unit": "V",
"min": 7.7,
"typ": 8.3,
"max": 8.9,
"conditions": "VIN falling, TSW changes from TSW(NOM) to TSW(L)",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switcher Period VIN Threshold",
"symbol": "VINSW(H)",
"kind": "electrical",
"unit": "V",
"min": 28,
"typ": 31,
"max": 34,
"conditions": "VIN rising, TSW changes from TSW(NOM) to TSW(H)",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck Switch On-Resistance",
"symbol": "RDS(on)",
"kind": "electrical",
"unit": "mΩ",
"min": null,
"typ": 275,
"max": 300,
"conditions": "TJ = 25°C, IDS = 0.1 A",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck Switch On-Resistance",
"symbol": "RDS(on)",
"kind": "electrical",
"unit": "mΩ",
"min": null,
"typ": 400,
"max": 470,
"conditions": "TJ = 150°C, IDS = 0.1 A",
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"source": "datasheet"
},
{
"name": "Minimum On-time",
"symbol": "ton(min)",
"kind": "electrical",
"unit": "ns",
"min": null,
"typ": 65,
"max": 90,
"conditions": "VIN = 13.5 V, RTON = 49.9 kΩ",
"source_page": 6,
"source": "datasheet"
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