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Ray Set visibility: public 57805d5 5d ago
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{
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  "type": "component",
  "slug": "uc2844aqd8r",
  "title": "UC2844AQD8R",
  "brief": "Texas Instruments DC-DC Controllers, SOIC-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": [
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    "power supply chip",
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  "component": {
    "mpn": "UC2844AQD8R",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Supply Chip",
    "subcategory": "DC-DC Controllers",
    "datasheet": "https://www.ti.com/lit/ds/symlink/uc2844aqd8r.pdf",
    "parts": {
      "symbol": "uc2844aqd8r.kicad_sym",
      "footprint": "uc2844aqd8r.kicad_mod",
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      "model_3d_plain": "uc2844aqd8r-etched.glb",
      "model_3d_step": "uc2844aqd8r-etched.step",
      "model_3d_step_plain": "uc2844aqd8r.step",
      "lbr": "uc2844aqd8r.lbr"
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    "distributor_links": {
      "lcsc": "C544584",
      "digikey": "296-15683-2-ND",
      "mouser": "595-UC2844AQD8R"
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    "distributor_check": {
      "checked_at": "2026-10-22T01:54:39Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-15683-2-ND",
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        "lifecycle": "Active"
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      "mouser": {
        "pn": "595-UC2844AQD8R",
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    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Low-impedance 1MHz internal error amplifier output, also the input to the peak current limit/PWM comparator, with 80dB open-loop gain; maximum sink current is 6mA and it is not internally current-limited."
      },
      {
        "number": "2",
        "name": "FB",
        "type": "input",
        "description": "Error amplifier input used to close the power converter voltage feedback loop and set loop stability."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Input to the controller peak current limit/PWM comparator; with a current sense resistor the error amplifier output sets cycle-by-cycle peak current limit, and the maximum peak sense signal is internally clamped at 1V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "input",
        "description": "Internal oscillator timing input programmed with external RT and CT; TI recommends CT between 470pF and 4.7nF and RT between 5kΩ and 100kΩ."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Controller signal ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "1A totem-pole gate driver output that sources and sinks up to 1A; a gate driver resistor must be used to limit the gate drive current."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Bias input for the gate driver and controller; the datasheet gives an 11V minimum recommended VCC and a 30V absolute maximum, and the bias capacitor must be at least 10 times the main switching FET gate capacitance."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "PWM controller 5V reference output that must supply no more than 10mA in normal operation, is short-circuit protected at about 100mA, and requires a 1µF high-frequency bypass capacitor."
      }
    ],
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        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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        "pages_sent": 25,
        "cost_usd": 0.1306,
        "at": "2026-10-22T01:53:32"
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      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/uc2844aqd8r.pdf",
        "pages": 50,
        "sha256": "0eebf00e4b265207",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "Power Supply Chip",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "0eebf00e4b26520728868d5c4a6795e4b096641846738514439ea8f166be692b",
      "rows": [
        {
          "name": "Reference output voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 4.95,
          "typ": 5,
          "max": 5.05,
          "conditions": "TJ = 25°C, IO = 1mA (UC184xA, UC284xA)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Reference line regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 6,
          "max": 20,
          "conditions": "12 ≤ VIN ≤ 25V",
          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "Reference load regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 6,
          "max": 25,
          "conditions": "1 ≤ IO ≤ 20mA",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Reference temperature stability",
          "symbol": "",
          "kind": "temperature_coefficient",
          "unit": "mV/°C",
          "min": null,
          "typ": 0.2,
          "max": 0.4,
          "conditions": "See notes (1), (6)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Reference total output variation",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 4.9,
          "typ": null,
          "max": 5.1,
          "conditions": "Line, load, temperature (UC184xA, UC284xA)",
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          "name": "Reference long-term stability",
          "symbol": "",
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          "max": 25,
          "conditions": "TA = 125°C, 1000 hours",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Output short-circuit current",
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          "kind": "electrical",
          "unit": "mA",
          "min": -30,
          "typ": -100,
          "max": -180,
          "conditions": "",
          "source_page": 6,
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        {
          "name": "Oscillator initial accuracy",
          "symbol": "",
          "kind": "electrical",
          "unit": "kHz",
          "min": 47,
          "typ": 52,
          "max": 57,
          "conditions": "TJ = 25°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Oscillator voltage stability",
          "symbol": "VCC",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": 1,
          "conditions": "12 ≤ VCC ≤ 25V",
          "source_page": 6,
          "source": "datasheet"
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          "name": "Oscillator temperature stability",
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          "kind": "temperature_coefficient",
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          "typ": null,
          "max": 5,
          "conditions": "TMIN ≤ TA ≤ TMAX",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Oscillator discharge current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": 7.8,
          "typ": 8.3,
          "max": 8.8,
          "conditions": "TJ = 25°C, VRT/CT = 2V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Oscillator discharge current (UC284xA)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": 7.5,
          "typ": null,
          "max": 8.8,
          "conditions": "VRT/CT = 2V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input voltage",
          "symbol": "VCOMP",
          "kind": "electrical",
          "unit": "V",
          "min": 2.45,
          "typ": 2.5,
          "max": 2.55,
          "conditions": "VCOMP = 2.5V (UC184xA, UC284xA)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input bias current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": -0.3,
          "max": -1,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier open-loop gain",
          "symbol": "AVOL",
          "kind": "electrical",
          "unit": "dB",
          "min": 65,
          "typ": 90,
          "max": null,
          "conditions": "2 ≤ VO ≤ 4V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier unity-gain bandwidth",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": 0.7,
          "typ": 1,
          "max": null,
          "conditions": "TJ = 25°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier common-mode rejection ratio",
          "symbol": "CMRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 70,
          "max": null,
          "conditions": "12 ≤ VCC ≤ 25V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output sink current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": 2,
          "typ": 6,
          "max": null,
          "conditions": "VFB = 2.7V, VCOMP = 1.1V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output source current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": -0.5,
          "typ": -0.8,
          "max": null,
          "conditions": "VFB = 2.3V, VCOMP = 5V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier VOUT high",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": 5,
          "typ": 6,
          "max": null,
          "conditions": "VFB = 2.3V, RL = 15kΩ to ground",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier VOUT low",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.7,
          "max": 1.1,
          "conditions": "VFB = 2.7V, RL = 15kΩ to VREF",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Current sense gain",
          "symbol": "",
          "kind": "electrical",
          "unit": "V/V",
          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "See notes (2), (3)",
          "source_page": 7,
          "source": "datasheet"
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        {
          "name": "Current sense maximum input signal",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "VCOMP = 5V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Current sense input bias current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": -2,
          "max": -10,
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          "source": "datasheet"
        },
        {
          "name": "Current sense delay to output",
          "symbol": "",
          "kind": "electrical",
          "unit": "ns",
          "min": null,
          "typ": 150,
          "max": 300,
          "conditions": "VISENSE = 0V to 2V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output low saturation voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.1,
          "max": 0.4,
          "conditions": "ISINK = 20mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output low saturation voltage (high current)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 15,
          "max": 2.2,
          "conditions": "ISINK = 200mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output high saturation voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 13,
          "typ": 13.5,
          "max": null,
          "conditions": "ISOURCE = 20mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output high saturation voltage (high current)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 12,
          "typ": 13.5,
          "max": null,
          "conditions": "ISOURCE = 200mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output rise time",
          "symbol": "",
          "kind": "electrical",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": 150,
          "conditions": "TJ = 25°C, CL = 1nF",
          "source_page": 7,
          "source": "datasheet"
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        {
          "name": "Output fall time",
          "symbol": "",
          "kind": "electrical",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": 150,
          "conditions": "TJ = 25°C, CL = 1nF",
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          "source": "datasheet"
        },
        {
          "name": "UVLO saturation voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.7,
          "max": 1.2,
          "conditions": "VCC = 5V, ISINK = 10mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "UVLO start threshold (UC2844A)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 15,
          "typ": 16,
          "max": 17,
          "conditions": "UC1842A, UC1844A, UC2842A and UC2844A",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "UVLO minimum operating voltage after turn-on (UC2844A)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 9,
          "typ": 10,
          "max": 11,
          "conditions": "UC1842A, UC1844A, UC2842A and UC2844A",
          "source_page": 7,
          "source": "datasheet"
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        {
          "name": "Maximum duty cycle (UCx844A)",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": 47,
          "typ": 48,
          "max": 50,
          "conditions": "UCx844A, UCx845A",
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          "source": "datasheet"
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          "name": "Minimum duty cycle",
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          "kind": "electrical",
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          "min": 0,
          "typ": null,
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          "conditions": "",
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        },
        {
          "name": "Startup current",
          "symbol": "",
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          "unit": "mA",
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          "typ": 0.3,
          "max": 0.5,
          "conditions": "",
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        {
          "name": "Operating supply current",
          "symbol": "",
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          "unit": "mA",
          "min": null,
          "typ": 11,
          "max": 17,
          "conditions": "VFB = VISENSE = 0V",
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          "source": "datasheet"
        },
        {
          "name": "VCC zener voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 30,
          "typ": 34,
          "max": null,
          "conditions": "ICC = 25mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage VCC (low-impedance source)",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "VCC pin",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output current",
          "symbol": "IOUT",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "Output energy (capacitive load)",
          "symbol": "",
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          "unit": "µJ",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Capacitive load",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Analog inputs voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
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