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Ray Set visibility: public 71dc588 2d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "uc2844bm",
  "title": "UC2844BM",
  "brief": "HGSEMI AC-DC Controllers And Regulators, SOP-8. 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)",
    "uc2844bm",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC2844BM",
    "manufacturer": "HGSEMI",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/8bad612ae6a43b38e7bbcc3af9bccb89.pdf",
    "parts": {
      "symbol": "uc2844bm.kicad_sym",
      "footprint": "uc2844bm.kicad_mod",
      "model_3d": "uc2844bm-hero.glb",
      "model_3d_plain": "uc2844bm-etched.glb",
      "model_3d_step": "uc2844bm-etched.step",
      "model_3d_step_plain": "uc2844bm.step",
      "lbr": "uc2844bm.lbr"
    },
    "distributor_links": {
      "lcsc": "C19193448"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T00:30:34Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "bidirectional",
        "description": "Error amplifier compensation pin, used to compensate the error amplifier feedback network."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Error amplifier inverting input; the recommended input voltage range for VFB is 0 to 5.0 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Current-sense comparator input; the recommended input voltage range is 0 to 5.0 V, and the peak sense signal is limited to 1.0 V at the 1 V maximum input signal."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "RC oscillator timing pin, with recommended input voltage range 0 to 5.0 V and oscillation frequency range 100 to 500 kHz."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Power ground; bypass capacitors should be placed close to this pin to handle high peak currents when driving capacitive loads."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "PWM totem-pole output for driving an N-channel MOSFET, rated at ±1 A peak output current and limited to 200 mA average output current, held low when off."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply pin with a recommended maximum of 28 V, an absolute maximum of 30 V, and a maximum supply current of 25 mA."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_in",
        "description": "Internally trimmed 5.0 V reference output (4.95 to 5.05 V at 25°C, 1 mA load) with a reference output current limit of -20 mA."
      }
    ],
    "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": 11,
        "cost_usd": 0.034,
        "at": "2026-11-05T00:30:25"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/8bad612ae6a43b38e7bbcc3af9bccb89.pdf",
        "pages": 11,
        "sha256": "27f143cab0a30a5f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "uc2844bm.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc2844bm-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "b2d3f36d383c016455323ee6bed77ed537608faab643ffa42706e938a5d99f24",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "SOP-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "27f143cab0a30a5fa4825325370b7e935df30edd4f315a0d8d4388fde934fff5",
      "rows": [
        {
          "name": "Supply voltage",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 28,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input voltage (RT/CT, VFB, ISENSE)",
          "symbol": "VI",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output voltage",
          "symbol": "VO",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 28,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply current",
          "symbol": "ICC",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 25,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Average output current",
          "symbol": "Io",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference output current",
          "symbol": "Io(ref)",
          "kind": "recommended_operating",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -20,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillation frequency",
          "symbol": "fosc",
          "kind": "recommended_operating",
          "unit": "kHz",
          "min": null,
          "typ": 100,
          "max": 500,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Ambient operating temperature",
          "symbol": "Ta",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 105,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction operating temperature",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage",
          "symbol": "Vcc",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output current",
          "symbol": "Io",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Analog input (pins 2, 3)",
          "symbol": "VI(ANA)",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output sink current",
          "symbol": "ISINK(EA)",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 850,
          "conditions": "Tamb≤25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance",
          "symbol": "RthJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 143,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (top) thermal resistance",
          "symbol": "RthJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 47.6,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
          "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": "Latch-up current",
          "symbol": "LU",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "25°C&125°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "ESD human body model",
          "symbol": "ESD-HBM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -2000,
          "typ": null,
          "max": 2000,
          "conditions": "25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "ESD charged device model",
          "symbol": "ESD-CDM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -500,
          "typ": null,
          "max": 500,
          "conditions": "25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Lead temperature (soldering 10 s)",
          "symbol": "TLEAD",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "焊接 10s",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference output voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 4.95,
          "typ": 5,
          "max": 5.05,
          "conditions": "Ta = 25°C, IL = 1mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Line regulation",
          "symbol": "ΔVREF1",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 6,
          "max": 20,
          "conditions": "VCC=12V~25V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Load regulation",
          "symbol": "ΔVREF2",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 6,
          "max": 25,
          "conditions": "IL=1 mA ~20 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Temperature stability",
          "symbol": "TS",
          "kind": "temperature_coefficient",
          "unit": "mV/°C",
          "min": null,
          "typ": 0.2,
          "max": 0.4,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Total output variation (line, load, temp)",
          "symbol": "ΔVREF3",
          "kind": "electrical",
          "unit": "V",
          "min": 4.82,
          "typ": null,
          "max": 5.18,
          "conditions": "Line, Load, Temp",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Long-term stability",
          "symbol": "S",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 5,
          "max": 25,
          "conditions": "Ta = 25°C,1000 小时",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output short-circuit current",
          "symbol": "ISC",
          "kind": "electrical",
          "unit": "mA",
          "min": -30,
          "typ": -100,
          "max": -180,
          "conditions": "VREF=0V, Ta=25°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Initial oscillator accuracy",
          "symbol": "f",
          "kind": "electrical",
          "unit": "kHz",
          "min": 49,
          "typ": 52,
          "max": 55,
          "conditions": "Ta=25°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Oscillator voltage stability",
          "symbol": "Δf/ΔVCC",
          "kind": "voltage_coefficient",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": 1,
          "conditions": "VCC=12V~25V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Discharge current",
          "symbol": "Idischg",
          "kind": "electrical",
          "unit": "mA",
          "min": 7.5,
          "typ": null,
          "max": 8.8,
          "conditions": "VOSC = 2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input voltage",
          "symbol": "VI(EA)",
          "kind": "electrical",
          "unit": "V",
          "min": 2.42,
          "typ": 2.5,
          "max": 2.58,
          "conditions": "Vpin1=2.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input bias current",
          "symbol": "IBIAS",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": -0.1,
          "max": -2,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Open-loop voltage gain",
          "symbol": "AVOL",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 90,
          "max": null,
          "conditions": "2 ≤Vo≤4V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Unity-gain bandwidth",
          "symbol": "BW",
          "kind": "electrical",
          "unit": "MHz",
          "min": 0.7,
          "typ": 1,
          "max": null,
          "conditions": "Ta=25°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier power supply rejection ratio",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 70,
          "max": null,
          "conditions": "12≤Vcc≤25V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output sink current",
          "symbol": "Isink",
          "kind": "electrical",
          "unit": "mA",
          "min": 2,
          "typ": 12,
          "max": null,
          "conditions": "Vpin2=2.7V, Vpin1=1.1V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output source current",
          "symbol": "Isource",
          "kind": "electrical",
          "unit": "mA",
          "min": -0.5,
          "typ": -1,
          "max": null,
          "conditions": "Vpin2=2.3V, Vpin1=5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output high voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5,
          "typ": 6.2,
          "max": null,
          "conditions": "Vpin2=2.3V, RL=15kΩ to GND",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output low voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.8,
          "max": 1.1,
          "conditions": "Vpin2=2.7V, RL=15kΩ to VREF",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current-sense gain",
          "symbol": "GV",
          "kind": "electrical",
          "unit": "V/V",
          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "note 1, 2",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum input signal",
          "symbol": "VI(MAX)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "Vpin1=5V (note 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current-sense input bias current",
          "symbol": "IBIAS",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": -2,
          "max": -10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output delay",
          "symbol": "TPLH",
          "kind": "timing",
          "unit": "ns",
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