component
A8519KLPTR-T
Public Made by Adomby adom
Allegro MicroSystems, LLC LED Drivers, TSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "A8519KLPTR-T",
"brief": "Allegro MicroSystems, LLC LED Drivers, TSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
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"nixie tube driver-led driver",
"a8519klptr-t",
"factory-2.0.0",
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"component": {
"mpn": "A8519KLPTR-T",
"manufacturer": "Allegro MicroSystems, LLC",
"package": "TSSOP-20-EP",
"pin_count": 21,
"category": "Nixie Tube Driver/LED Driver",
"subcategory": "LED Drivers",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/7060911eeb3fe72209fbebced7eff0b1.pdf",
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"distributor_links": {
"lcsc": "C7208806",
"digikey": "620-A8519KLPTR-TTR-ND",
"mouser": "250-A8519KLPTR-T"
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"source": "Component Ocean /api/assign-pns",
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"status": "found"
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},
"pins": [
{
"number": "1",
"name": "COMP",
"type": "passive",
"description": "Output of the error amplifier and compensation node; connect an Rz-Cz-Cp network from this pin to GND for control loop compensation."
},
{
"number": "2",
"name": "PGND",
"type": "power_in",
"description": "Power ground for the internal N-channel MOSFET switching device; connect to the PCB ground plane."
},
{
"number": "3",
"name": "OVP",
"type": "input",
"description": "Overvoltage protection input; connect an external resistor from VOUT to this pin to set the overvoltage protection level (OVP pin threshold 7 V to 9.5 V)."
},
{
"number": "4",
"name": "VOUT",
"type": "input",
"description": "Connect directly to the boost output voltage; maximum output voltage is 40 V."
},
{
"number": "5",
"name": "SW",
"type": "passive",
"description": "Drain of the internal N-channel MOSFET switch of the boost converter; the SW pin is rated -0.6 V to 42 V continuous."
},
{
"number": "6",
"name": "GATE",
"type": "output",
"description": "Gate driver output for control of an external P-channel MOSFET input disconnect switch."
},
{
"number": "7",
"name": "VSENSE",
"type": "input",
"description": "Connect to the negative side of the current sense resistor RSC; the threshold is measured as VIN minus VSENSE, with a fixed current sink for trip threshold adjustment."
},
{
"number": "8",
"name": "VIN",
"type": "power_in",
"description": "Input power to the IC and the positive input for the current sense resistor; the input voltage range is 4.5 V to 40 V."
},
{
"number": "9",
"name": "FAULT",
"type": "output",
"description": "Open-drain fault output that is pulled low when a fault occurs; connect a 100 kΩ resistor between this pin and the desired logic level voltage."
},
{
"number": "10",
"name": "CLKOUT",
"type": "output",
"description": "Logic output representing the internal boost oscillator switching frequency, allowing other converters to be synchronized to it."
},
{
"number": "11",
"name": "VDD",
"type": "power_out",
"description": "Output of the internal LDO bias regulator; connect a 1 µF decoupling capacitor between this pin and GND."
},
{
"number": "12",
"name": "APWM",
"type": "input",
"description": "Analog trimming or dimming input; applying a digital PWM signal to this pin adjusts the internal IISET current."
},
{
"number": "13",
"name": "PWM",
"type": "input",
"description": "Enables the IC when pulled high and controls LED intensity by pulse-width modulation; typical PWM dimming frequency is 100 Hz to 400 Hz."
},
{
"number": "14",
"name": "FSET",
"type": "input",
"description": "Frequency and synchronization pin; a resistor RFSET from this pin to GND sets the switching frequency, or an external clock from 320 kHz to 2.3 MHz synchronizes it with dithering disabled."
},
{
"number": "15",
"name": "ISET",
"type": "input",
"description": "Connect the RISET resistor between this pin and GND to set the desired LED current."
},
{
"number": "16",
"name": "AGND",
"type": "power_in",
"description": "LED current ground; connect to the PCB ground plane."
},
{
"number": "17",
"name": "LED1",
"type": "input",
"description": "LED current sink #1; connect the cathode of the LED string to this pin, and terminate it to GND through 3.09 kΩ if unused."
},
{
"number": "18",
"name": "LED2",
"type": "input",
"description": "LED current sink #2; connect the cathode of the LED string to this pin, and terminate it to GND through 3.09 kΩ if unused."
},
{
"number": "19",
"name": "LED3",
"type": "input",
"description": "LED current sink #3; connect the cathode of the LED string to this pin, and terminate it to GND through 3.09 kΩ if unused."
},
{
"number": "20",
"name": "LED4",
"type": "input",
"description": "LED current sink #4; connect the cathode of the LED string to this pin, and terminate it to GND through 3.09 kΩ if unused."
},
{
"number": "21",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
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"factory_chain": {
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"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
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],
"pages_sent": 6,
"cost_usd": 0.0235,
"at": "2026-10-30T22:40:44"
},
"datasheet": {
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"pages": 38,
"sha256": "f15a7280a8b54665",
"source_tier": "lcsc"
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 21,
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{
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"metadata": {
"specs": {
"Manufacturer": "Allegro MicroSystems, LLC",
"Package": "TSSOP-20-EP",
"Category": "Nixie Tube Driver/LED Driver",
"Pins": "21"
},
"appearance": {
"contacts": {
"quote": "A8519KLPTR-T –40 to 125 350 mV 20-pin TSSOP with exposed thermal pad 4000 pieces per reel 100% matte tin A8519KETTR-R –40 to 125 350 mV 28-pin 5 × 5 mm QFN with exposed thermal pad and sidewall plate",
"page": 2,
"doc": "ds.pdf",
"plating": "tin"
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"rows": [
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"name": "LEDx Pins voltage",
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"conditions": "x = 1, 2, 3, or 4",
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{
"name": "OVP Pin voltage",
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{
"name": "VIN, VOUT Pins voltage",
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{
"name": "VSENSE, GATE Pins voltage",
"symbol": "VSENSE, VGATE",
"kind": "absolute_maximum",
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"min": -7.4,
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"conditions": "Relative to VIN (VIN –7.4 to VIN +0.4)",
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{
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{
"name": "SW Pin voltage transient",
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"unit": "V",
"min": -1,
"typ": null,
"max": 48,
"conditions": "t < 50 ns",
"source_page": 2,
"source": "datasheet"
},
{
"name": "FAULT Pin voltage",
"symbol": "VFAULT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 40,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "APWM, PWM, CLKOUT, COMP, FSET, ISET, VDD Pins voltage",
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"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
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{
"name": "Operating Ambient Temperature",
"symbol": "TA",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "K temperature range",
"source_page": 2,
"source": "datasheet"
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{
"name": "Maximum Junction Temperature",
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"unit": "°C",
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"conditions": "",
"source_page": 2,
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{
"name": "Storage Temperature",
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"unit": "°C",
"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Input Voltage Range",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": 4.5,
"typ": null,
"max": 40,
"conditions": "● guaranteed over full operating temperature range",
"source_page": 6,
"source": "datasheet"
},
{
"name": "UVLO Start Threshold",
"symbol": "VUVLOrise",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 4.35,
"conditions": "VIN rising",
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{
"name": "UVLO Stop Threshold",
"symbol": "VUVLOfall",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 3.9,
"conditions": "VIN falling",
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"source": "datasheet"
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{
"name": "UVLO Hysteresis",
"symbol": "VUVLOHYS",
"kind": "electrical",
"unit": "mV",
"min": 300,
"typ": 450,
"max": 600,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Quiescent Current",
"symbol": "IQ",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 8,
"max": 15,
"conditions": "VPWM = VIH, fSW = 2 MHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Sleep Supply Current",
"symbol": "ISLEEP",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 2,
"max": 10,
"conditions": "VIN = 16 V, VPWM = VSYNC = 0 V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Logic Level Low",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "",
"source_page": 6,
"source": "datasheet"
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{
"name": "Input Logic Level High",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 1.5,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "PWM Input Pull-Down Resistor",
"symbol": "REN",
"kind": "electrical",
"unit": "kΩ",
"min": 60,
"typ": 100,
"max": 140,
"conditions": "VPWM = 5 V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "APWM Input Pull-Down Resistor",
"symbol": "RAPWM",
"kind": "electrical",
"unit": "kΩ",
"min": 60,
"typ": 100,
"max": 140,
"conditions": "VPWM = VIH",
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},
{
"name": "APWM Frequency",
"symbol": "fAPWM",
"kind": "electrical",
"unit": "kHz",
"min": 40,
"typ": null,
"max": 1000,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Logic Level Low",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.3,
"conditions": "5 V < VIN < 40 V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Logic Level High",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": null,
"max": null,
"conditions": "5 V < VIN < 40 V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "OVP Pin Voltage Threshold",
"symbol": "VOVP(th)",
"kind": "electrical",
"unit": "V",
"min": 7,
"typ": 8.3,
"max": 9.5,
"conditions": "OVP pin connected to VOUT",
"source_page": 6,
"source": "datasheet"
},
{
"name": "OVP Pin Sense Current Threshold",
"symbol": "IOVP(th)",
"kind": "electrical",
"unit": "µA",
"min": 190,
"typ": 200,
"max": 210,
"conditions": "Current into OVP pin",
"source_page": 6,
"source": "datasheet"
},
{
"name": "OVP Pin Leakage Current",
"symbol": "IOVP(LKG)",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.1,
"max": 1,
"conditions": "VIN = 16 V, PWM = L",
"source_page": 6,
"source": "datasheet"
},
{
"name": "OVP Accuracy",
"symbol": "",
"kind": "electrical",
"unit": "%",
"min": null,
"typ": null,
"max": 5,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Undervoltage Protection Threshold",
"symbol": "VUVP(th)",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 0.55,
"max": 0.7,
"conditions": "Measured at VOUT pin when ROVP = 0",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Secondary Overvoltage Protection",
"symbol": "VOVP(sec)",
"kind": "electrical",
"unit": "V",
"min": 42,
"typ": 45,
"max": 48,
"conditions": "Measured at SW pin",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switch On-Resistance",
"symbol": "RSW",
"kind": "electrical",
"unit": "mΩ",
"min": 100,
"typ": 250,
"max": 500,
"conditions": "ISW = 0.75 A, VIN = 16 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Switch Leakage Current",
"symbol": "ISW(LKG)",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.1,
"max": 1,
"conditions": "VSW = 16 V, VPWM = VIL",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Switch Current Limit",
"symbol": "ISW(LIM)",
"kind": "electrical",
"unit": "A",
"min": 3,
"typ": 3.65,
"max": 4.5,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Minimum Switch On-Time",
"symbol": "tSW(on)",
"kind": "electrical",
"unit": "ns",
"min": 45,
"typ": 65,
"max": 85,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Minimum Switch Off-Time",
"symbol": "tSW(off)",
"kind": "electrical",
"unit": "ns",
"min": null,
"typ": 65,
"max": 85,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Oscillator Frequency",
"symbol": "fSW",
"kind": "electrical",
"unit": "MHz",
"min": 1.95,
"typ": 2.15,
"max": 2.35,
"conditions": "RFSET = 10 kΩ",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Oscillator Frequency",
"symbol": "fSW",
"kind": "electrical",
"unit": "MHz",
"min": 0.9,
"typ": 1,
"max": 1.1,
"conditions": "RFSET = 21.5 kΩ",
"source_page": 7,
"source": "datasheet"
},
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