TL2843BD-8

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  "slug": "tl2843bd-8",
  "title": "TL2843BD-8",
  "brief": "Texas Instruments AC-DC Controllers And Regulators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "TL2843BD-8",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/tl2843b.pdf",
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    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output / compensation node. Used to close the voltage feedback loop by connecting a compensation network (typically an RC network) between this pin and VFB. Internally clamped to set the peak current-sense threshold."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the internal error amplifier. Feedback voltage from the converter output is divided down and applied here; the amplifier compares it against the internal 2.5 V reference to regulate the output."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Current-sense input. A voltage proportional to the primary switch current (developed across a sense resistor) is applied here. The internal PWM comparator terminates the output pulse when this pin reaches ~1 V, providing cycle-by-cycle current limiting."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. An external resistor to VREF and capacitor to GND set the oscillator frequency (fOSC ≈ 1.72 / (RT·CT)). Also sets the maximum duty cycle via the discharge current."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Signal and power ground return. All internal circuitry is referenced to this pin; connect to system ground with a low-inductance path."
      },
      {
        "number": "6",
        "name": "OUT",
        "type": "output",
        "description": "High-current totem-pole gate-drive output. Directly drives the gate of an external power MOSFET; typical peak source/sink current of ±1 A. Output swings from GND to VCC."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input for the controller and output stage. UVLO thresholds are 16 V (turn-on) / 10 V (turn-off) for the '-8' variant. Absolute maximum 30 V; bypass with a low-ESR capacitor close to the pin."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Buffered 5 V ±2% reference output. Capable of sourcing up to ~50 mA for external circuitry and for programming the oscillator via RT. Requires a bypass capacitor (typ. 0.1 µF) to GND for stability."
      }
    ],
    "provenance": {
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      "pins": {
        "total": 8,
        "described": 8,
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        "checked": "2026-10-07",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    }
  },
  "variants": [
    {
      "mpn": "TL2843BD-8D",
      "kind": "packaging"
    },
    {
      "mpn": "TL2843BD-8DR",
      "kind": "packaging"
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  "discovery_pitch": "TL2843BD-8 (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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  "updated_at": "2026-09-25T09:51:49.463Z"
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