A8522KLPTR-T

{
  "schema_version": 1,
  "type": "component",
  "slug": "a8522klptr-t",
  "title": "A8522KLPTR-T",
  "brief": "Allegro MicroSystems, LLC LED Drivers, TSSOP-28-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": [
    "component",
    "display modules - led drivers - display drivers",
    "a8522klptr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "A8522KLPTR-T",
    "manufacturer": "Allegro MicroSystems, LLC",
    "package": "TSSOP-28-EP",
    "pin_count": 29,
    "category": "Display Modules / LED Drivers / Display Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/36e817d4a09f91c563ddc491286ecaa7.pdf",
    "parts": {
      "symbol": "a8522klptr-t.kicad_sym",
      "footprint": "a8522klptr-t.kicad_mod",
      "model_3d": "a8522klptr-t-hero.glb",
      "model_3d_plain": "a8522klptr-t-etched.glb",
      "model_3d_step": "a8522klptr-t-etched.step",
      "model_3d_step_plain": "a8522klptr-t.step",
      "lbr": "a8522klptr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C2679119",
      "digikey": "A8522KLPTR-T-ND",
      "mouser": "250-A8522KLPTR-T"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T17:20:49Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "A8522KLPTR-T-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "250-A8522KLPTR-T",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GATE",
        "type": "output",
        "description": "Gate driver for an optional external PMOS input-disconnect switch, pulled high to turn off the input supply on a fault such as output shorted to GND; left open if not used."
      },
      {
        "number": "2",
        "name": "INS",
        "type": "input",
        "description": "Input current sense used together with VIN to detect input overcurrent faults; tie to VIN if not used."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Input power to the A8522, specified over an input voltage range of 4.5 to 36 V."
      },
      {
        "number": "4",
        "name": "EN",
        "type": "input",
        "description": "Enable input that keeps the IC in shutdown while EN = VEN(L) and enables the part when connected to VEN(H) or to VIN."
      },
      {
        "number": "5",
        "name": "FSET/SYNC",
        "type": "bidirectional",
        "description": "A resistor RFSET from this pin to GND sets the switching frequency, and the pin can also be used to synchronize to an external switching frequency."
      },
      {
        "number": "6",
        "name": "COMP",
        "type": "passive",
        "description": "Output of the error amplifier and compensation node; connect a type-2 feedback network from this pin to AGND for loop compensation."
      },
      {
        "number": "7",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground for noise-sensitive components, especially COMP, and connected to the thermal pad."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_out",
        "description": "Output of the internal LDO; connect a 0.47 µF decoupling capacitor between this pin and AGND."
      },
      {
        "number": "9",
        "name": "FLAG",
        "type": "output",
        "description": "Active-low open-drain pin indicating that system attention is required, such as during startup or a fault; connect a 10 to 100 kΩ pull-up to the target logic level."
      },
      {
        "number": "10",
        "name": "LED1",
        "type": "passive",
        "description": "LED current sink channel 1, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "11",
        "name": "LED2",
        "type": "passive",
        "description": "LED current sink channel 2, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "12",
        "name": "LED3",
        "type": "passive",
        "description": "LED current sink channel 3, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "13",
        "name": "LED4",
        "type": "passive",
        "description": "LED current sink channel 4, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "14",
        "name": "LED5",
        "type": "passive",
        "description": "LED current sink channel 5, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "15",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground for noise-sensitive components, especially COMP, and connected to the thermal pad."
      },
      {
        "number": "16",
        "name": "LED6",
        "type": "passive",
        "description": "LED current sink channel 6, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "17",
        "name": "LED7",
        "type": "passive",
        "description": "LED current sink channel 7, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "18",
        "name": "LED8",
        "type": "passive",
        "description": "LED current sink channel 8, up to 60 mA; any unused LEDx pin should be connected to GND through a 4.7 kΩ resistor."
      },
      {
        "number": "19",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; terminate to GND through a 4.7 kΩ resistor and do not short directly to GND."
      },
      {
        "number": "20",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; terminate to GND through a 4.7 kΩ resistor and do not short directly to GND."
      },
      {
        "number": "21",
        "name": "GPO2",
        "type": "output",
        "description": "General purpose open-drain output 2, programmable by internal register."
      },
      {
        "number": "22",
        "name": "GPO1",
        "type": "output",
        "description": "General purpose open-drain output 1, programmable by internal register."
      },
      {
        "number": "23",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C data signal."
      },
      {
        "number": "24",
        "name": "SCL",
        "type": "input",
        "description": "I2C clock signal."
      },
      {
        "number": "25",
        "name": "ADDR",
        "type": "input",
        "description": "Four-level input that sets up to 4 physical IC addresses based on the voltage level set by a resistor to GND."
      },
      {
        "number": "26",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground for the internal NMOS switching device; connect to the output capacitor ground and to the thermal pad."
      },
      {
        "number": "27",
        "name": "OVP",
        "type": "input",
        "description": "Connect to output voltage VOUT to provide output overvoltage protection (OVP) and undervoltage protection (UVP)."
      },
      {
        "number": "28",
        "name": "SW",
        "type": "passive",
        "description": "Drain of the internal NMOS switch of the boost converter."
      },
      {
        "number": "29",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "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": [],
        "pages_sent": 8,
        "cost_usd": 0.0649,
        "at": "2026-11-05T17:20:42"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/36e817d4a09f91c563ddc491286ecaa7.pdf",
        "pages": 65,
        "sha256": "d6a7732d3abb26ac",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "a8522klptr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.2,
          9.7,
          1.05
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "ff242f1d3be9d09e7f929707a2c5b1ee974a4f882053b04bcdb1cd2cb21223ef",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a8522klptr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.2,
          9.7,
          1.05
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f82a912a3590f64f4326b1945f954e37a14d1ad2c267a830b71f58a713d1772c",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems, LLC",
      "Package": "TSSOP-28-EP",
      "Category": "Display Modules / LED Drivers / Display Drivers",
      "Pins": "29"
    },
    "appearance": {
      "contacts": {
        "quote": "A8522KLPTR-T –40 to 125 28-pin TSSOP with exposed thermal pad 4000 pieces per 13-in. reel 100% matte tin",
        "page": 2,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "d6a7732d3abb26ac2a724a96681b1126b06dc518c7be9b5fd515cbeae551675f"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "d6a7732d3abb26ac2a724a96681b1126b06dc518c7be9b5fd515cbeae551675f",
      "rows": [
        {
          "name": "LEDx Pins",
          "symbol": "VLEDx",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 42,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "FLAG, GPO2, and OVP Pins",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 42,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "EN, VIN, INS, and GATE Pins",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 40,
          "conditions": "INS and GATE pins should not exceed VIN by more than 0.4 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "SW Pin, continuous",
          "symbol": "VSW",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.6,
          "typ": null,
          "max": 42,
          "conditions": "Continuous",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "SW Pin, transient",
          "symbol": "VSW",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -1,
          "typ": null,
          "max": 46,
          "conditions": "t < 50 ns",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VDD, FSET/SYNC, COMP, GPO1, SDA, SCL, and ADDR Pins",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Ambient Temperature",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "K temperature range",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature",
          "symbol": "TJ(max)",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 28,
          "max": null,
          "conditions": "On 4-layer PCB based on JEDEC standard",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage Range",
          "symbol": "VIN",
          "kind": "electrical",
          "unit": "V",
          "min": 4.5,
          "typ": null,
          "max": 36,
          "conditions": "Measured at the VIN pin",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VIN Pin UVLO Start",
          "symbol": "VINUV(ON)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 4.35,
          "conditions": "VIN rising",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VIN Pin UVLO Stop",
          "symbol": "VINUV(OFF)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 3.9,
          "conditions": "VIN falling",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input Sleep Supply Current",
          "symbol": "IQSLEEP",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 3.5,
          "max": 10,
          "conditions": "Sum of VIN and INS pin currents, VIN = VINS = 16 V, VEN = 0 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "EN Input Logic Level - Low",
          "symbol": "VEN(L)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "4.5 V < VIN < 36 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "EN Input Logic Level - High",
          "symbol": "VEN(H)",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": null,
          "conditions": "4.5 V < VIN < 36 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Overvoltage Threshold (minimum setting)",
          "symbol": "VOVPMIN",
          "kind": "electrical",
          "unit": "V",
          "min": 7.5,
          "typ": 8,
          "max": 8.5,
          "conditions": "OVP register = xxx0 0000",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Overvoltage Threshold (maximum setting)",
          "symbol": "VOVPMAX",
          "kind": "electrical",
          "unit": "V",
          "min": 38,
          "typ": 39,
          "max": 40,
          "conditions": "OVP register = xxx1 1111",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "OVP Leakage Current",
          "symbol": "IOVPLKG",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.1,
          "max": 1,
          "conditions": "VOVP =16 V, EN = VEN(L)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Switch On-Resistance",
          "symbol": "RDS(ON)",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": 220,
          "max": 350,
          "conditions": "ISW = 0.750 A, VIN = 16 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Switch Leakage Current",
          "symbol": "ISWLKG",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.1,
          "max": 10,
          "conditions": "VSW = 16 V, EN = VEN(L), TA = TJ = –40°C to 85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Cycle-by-Cycle Switch Current Limit",
          "symbol": "ISW(LIM)",
          "kind": "electrical",
          "unit": "A",
          "min": 3.6,
          "typ": 4.2,
          "max": 4.8,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Secondary Switch Current Limit",
          "symbol": "ISWLIM(sec)",
          "kind": "electrical",
          "unit": "A",
          "min": 5.6,
          "typ": 7,
          "max": null,
          "conditions": "Higher than maximum ISW(LIM) at any condition (A8522 latches when detected)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Minimum Switch On-Time",
          "symbol": "tSWONTIME",
          "kind": "electrical",
          "unit": "ns",
          "min": null,
          "typ": 85,
          "max": 120,
          "conditions": "RFSET = 10 kΩ",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Minimum Switch Off-Time",
          "symbol": "tSWOFFTIME",
          "kind": "electrical",
          "unit": "ns",
          "min": null,
          "typ": 55,
          "max": 85,
          "conditions": "RFSET = 10 kΩ",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Boost Stage Switching Frequency",
          "symbol": "fSW",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1.8,
          "typ": 2,
          "max": 2.2,
          "conditions": "RFSET = 10 kΩ",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Synchronized Boost Stage Switching Frequency",
          "symbol": "fSW_SYNC",
          "kind": "electrical",
          "unit": "kHz",
          "min": 400,
          "typ": null,
          "max": 2300,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Synchronization Input Minimum Off-Time",
          "symbol": "tSYNCPWOFF",
          "kind": "electrical",
          "unit": "ns",
          "min": 150,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Synchronization Input Minimum On-Time",
          "symbol": "tSYNCPWON",
          "kind": "electrical",
          "unit": "ns",
          "min": 150,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Synchronization Input Logic – Low",
          "symbol": "VSYNCON(L)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Synchronization Input Logic – High",
          "symbol": "VSYNCON(H)",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "LEDx Accuracy (Average)",
          "symbol": "ErrLEDx",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.7,
          "max": 3,
          "conditions": "Measured at ILEDMAX (maximum LED current)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "LEDx Matching",
          "symbol": "ΔILEDx",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.8,
          "max": 3,
          "conditions": "Compared to average ILEDx, measured at ILEDMAX",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "LEDx Regulation Voltage",
          "symbol": "VREG",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.85,
          "max": 1,
          "conditions": "ISET register= xx11 1111",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "ILEDx Step Size",
          "symbol": "ISETSTEP",
          "kind": "electrical",
          "unit": "mA",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "Total 64 steps",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Maximum LEDx Current (Average)",
          "symbol": "ILEDMAX",
          "kind": "electrical",
          "unit": "mA",
          "min": 62,
          "typ": 64,
          "max": 66,
          "conditions": "ISET register = xx11 1111",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Interrupt Pin Pull-Down Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "Fault/Interrupt condition asserted, pull-up current = 0.5 mA",
          "source_page": 7,
          "source": "datasheet"
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