A4490EESTR-T

{
  "schema_version": 1,
  "type": "component",
  "slug": "a4490eestr-t",
  "title": "A4490EESTR-T",
  "brief": "Allegro MicroSystems LLC Charge Pumps, QFN-20-EP(4x4). 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",
    "power management (pmic)",
    "a4490eestr-t",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "A4490EESTR-T",
    "manufacturer": "Allegro MicroSystems LLC",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Power Management (PMIC)",
    "subcategory": "Charge Pumps",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881680145137664",
    "parts": {
      "symbol": "a4490eestr-t.kicad_sym",
      "footprint": "a4490eestr-t.kicad_mod",
      "model_3d": "a4490eestr-t-hero.glb",
      "model_3d_plain": "a4490eestr-t-etched.glb",
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      "lbr": "a4490eestr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C146411"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T07:48:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "FB1",
        "type": "input",
        "description": "Feedback input for REG1, connected to the resistor divider from the VREG1 output (0.8 V target reference)."
      },
      {
        "number": "2",
        "name": "VDD",
        "type": "power_in",
        "description": "Bias supply for logic; externally supplied range is 3.3 to 5.5 V, recommended from a 3.3 to 5 V regulated output."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; should be connected externally to PGND."
      },
      {
        "number": "4",
        "name": "FB2",
        "type": "input",
        "description": "Feedback input for REG2, connected to the resistor divider from the VREG2 output."
      },
      {
        "number": "5",
        "name": "ENB2",
        "type": "input",
        "description": "Enable input for REG2, logic input, active high (VIH 2.0 V min, VIL 0.8 V max; input current limited to 1 mA)."
      },
      {
        "number": "6",
        "name": "LX2",
        "type": "passive",
        "description": "Switch node for REG2, connected to the inductor and flyback diode."
      },
      {
        "number": "7",
        "name": "VBB2",
        "type": "power_in",
        "description": "Input supply for REG2; must be connected together externally with the other VBBx pins (4.5 to 34 V)."
      },
      {
        "number": "8",
        "name": "CPOR",
        "type": "passive",
        "description": "Power-on-reset delay adjustment; capacitor to ground sets tPOR = 2.131×10^5 × CPOR."
      },
      {
        "number": "9",
        "name": "PORZ",
        "type": "output",
        "description": "Power-on-reset open-drain output, active low (VPORZL max 0.4 V at 1 mA)."
      },
      {
        "number": "10",
        "name": "VCP",
        "type": "passive",
        "description": "Charge pump reservoir capacitor connection."
      },
      {
        "number": "11",
        "name": "CP2",
        "type": "passive",
        "description": "Charge pump capacitor terminal."
      },
      {
        "number": "12",
        "name": "CP1",
        "type": "passive",
        "description": "Charge pump capacitor terminal."
      },
      {
        "number": "13",
        "name": "PGND",
        "type": "power_in",
        "description": "Ground for charge pump circuitry; should be connected externally to GND and to the thermal vias."
      },
      {
        "number": "14",
        "name": "FB3",
        "type": "input",
        "description": "Feedback input for REG3, connected to the resistor divider from the VREG3 output."
      },
      {
        "number": "15",
        "name": "ENB3",
        "type": "input",
        "description": "Enable input for REG3, logic input, active high (VIH 2.0 V min, VIL 0.8 V max; input current limited to 1 mA)."
      },
      {
        "number": "16",
        "name": "LX3",
        "type": "passive",
        "description": "Switch node for REG3, connected to the inductor and flyback diode."
      },
      {
        "number": "17",
        "name": "VBB3",
        "type": "power_in",
        "description": "Input supply for REG3; must be connected together externally with the other VBBx pins (4.5 to 34 V)."
      },
      {
        "number": "18",
        "name": "VBB1",
        "type": "power_in",
        "description": "Input supply for REG1; must be connected together externally with the other VBBx pins (4.5 to 34 V)."
      },
      {
        "number": "19",
        "name": "LX1",
        "type": "passive",
        "description": "Switch node for REG1, connected to the inductor and flyback diode."
      },
      {
        "number": "20",
        "name": "ENB1",
        "type": "input",
        "description": "Enable input for REG1, logic input, active high (VIH 2.0 V min, VIL 0.8 V max; input current limited to 1 mA)."
      },
      {
        "number": "21",
        "name": "PAD",
        "type": "power_in",
        "description": "Exposed pad for enhanced thermal dissipation; connect to the ground (0 V) plane using thermal vias."
      }
    ],
    "provenance": {
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        "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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          "exposed pad 21 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
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        "pages_sent": 17,
        "cost_usd": 0.0949,
        "at": "2026-10-18T07:48:34"
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        "pages": 17,
        "sha256": "df57216978689102",
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
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  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems LLC",
      "Package": "QFN-20-EP(4x4)",
      "Category": "Power Management (PMIC)",
      "Pins": "21"
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        "quote": "dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.",
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          "name": "ENBx Pin Input Current (absolute maximum)",
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          "name": "Operating Ambient Temperature Range E (absolute maximum)",
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        {
          "name": "Maximum Junction Temperature (absolute maximum)",
          "symbol": "TJ(max)",
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          "unit": "ºC",
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        {
          "name": "Storage Temperature (absolute maximum)",
          "symbol": "Tstg",
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          "unit": "ºC",
          "min": -55,
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          "name": "Load Supply Voltage (recommended)",
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          "unit": "V",
          "min": 4.5,
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          "max": 34,
          "conditions": "To operate at VBB < 6 V, connect VDD supply to the VBB supply",
          "source_page": 2,
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        },
        {
          "name": "LX1, LX2, and LX3 Pins (recommended)",
          "symbol": "VLXn",
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          "unit": "V",
          "min": -0.7,
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          "name": "Operating Ambient Temperature (recommended)",
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        {
          "name": "Junction Temperature (recommended)",
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          "unit": "ºC",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 2,
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        {
          "name": "Package Thermal Resistance",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "ºC/W",
          "min": null,
          "typ": 37,
          "max": null,
          "conditions": "On 4-layer PCB based on JEDEC standard",
          "source_page": 2,
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        },
        {
          "name": "VBB Quiescent Current",
          "symbol": "IBBON",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1,
          "max": 2,
          "conditions": "ENBx = high, ILOAD = 0 mA, VBB = 12 V, current drawn by feedback resistors ignored",
          "source_page": 5,
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          "name": "VDD Supply Range",
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          "min": 3.3,
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          "max": 5.5,
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        {
          "name": "VDD Quiescent Current (ENBx high)",
          "symbol": "IDD",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "ENBx = high",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "Feedback Input Bias Current",
          "symbol": "IBIAS",
          "kind": "electrical",
          "unit": "nA",
          "min": -400,
          "typ": -100,
          "max": 100,
          "conditions": "",
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        {
          "name": "Feedback Voltage",
          "symbol": "VFB",
          "kind": "tolerance",
          "unit": "%",
          "min": -1.5,
          "typ": null,
          "max": 1.5,
          "conditions": "With respect to 0.8 V target voltage",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Voltage Regulation",
          "symbol": "VOUT",
          "kind": "tolerance",
          "unit": "%",
          "min": -2.5,
          "typ": null,
          "max": 2.5,
          "conditions": "VREGx = 5 V, IOUT = 0 to 1.5 A, TA = –20°C to 85°C",
          "source_page": 5,
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        {
          "name": "Output Voltage Regulation",
          "symbol": "VOUT",
          "kind": "tolerance",
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        {
          "name": "PWM Frequency",
          "symbol": "fSW",
          "kind": "electrical",
          "unit": "kHz",
          "min": 470,
          "typ": 550,
          "max": 630,
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        {
          "name": "Maximum Duty Cycle",
          "symbol": "Dmax",
          "kind": "electrical",
          "unit": "%",
          "min": 90,
          "typ": null,
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        {
          "name": "Current Limit Threshold",
          "symbol": "ILIM",
          "kind": "electrical",
          "unit": "A",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "Peak current through switch with D = 0.9",
          "source_page": 5,
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        {
          "name": "Soft Start Duration",
          "symbol": "tss",
          "kind": "timing",
          "unit": "ms",
          "min": 0.625,
          "typ": 1.25,
          "max": 1.875,
          "conditions": "",
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          "name": "ENBx Input Voltage Low",
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          "kind": "electrical",
          "unit": "V",
          "min": null,
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          "max": 0.8,
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          "source_page": 5,
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        {
          "name": "ENBx Input Voltage High",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "",
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        {
          "name": "ENBx Input Hysteresis",
          "symbol": "VI(hys)",
          "kind": "electrical",
          "unit": "mV",
          "min": 300,
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          "name": "ENBx Input Current",
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          "name": "PORZ Output Low Voltage",
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          "name": "PORZ Output Leakage Current",
          "symbol": "IPORZH",
          "kind": "electrical",
          "unit": "μA",
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          "conditions": "VPORZ = 5 V, fault not asserted",
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          "name": "Power-On Reset Duration",
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          "conditions": "CPOR = 470 nF",
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          "name": "VBB Undervoltage Lockout Startup (no external VDD)",
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          "conditions": "No external VDD supply, VBB rising",
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          "name": "VBB Undervoltage Lockout Startup (external VDD)",
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          "conditions": "No external VDD supply, VBB falling",
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          "name": "VBB Undervoltage Lockout Shutdown (external VDD)",
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          "unit": "V",
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