LM2576 3A Step-Down Regulator

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm2576",
  "title": "LM2576 3A Step-Down Regulator",
  "brief": "3 A step-down (buck) switching regulator with a 52 kHz internal oscillator and few external parts.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "buck",
    "regulator",
    "switching",
    "step-down",
    "pmic",
    "ti",
    "to-263"
  ],
  "component": {
    "mpn": "LM2576",
    "manufacturer": "Texas Instruments",
    "package": "TO-263-5",
    "pin_count": 5,
    "category": "Power Management",
    "subcategory": "Switching Regulator (Buck)",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lm2576.pdf",
    "parts": {
      "symbol": "lm2576.kicad_sym",
      "footprint": "lm2576.kicad_mod",
      "model_3d": "lm2576-etched.glb",
      "model_3d_plain": "lm2576.glb",
      "lbr": "lm2576.lbr",
      "model_3d_step": "lm2576-etched.step",
      "model_3d_step_plain": "lm2576.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply input pin to the collector of the internal high-side power transistor. Connect to the unregulated DC input (7 V to 40 V for LM2576; up to 60 V for LM2576HV). Path from VIN to the high-frequency bypass CIN and GND must be as short as possible."
      },
      {
        "number": "2",
        "name": "OUTPUT",
        "type": "output",
        "description": "Emitter pin of the internal power transistor - the switching node of the buck converter. Attach this pin to the inductor and to the cathode of the external freewheeling (catch) diode."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Return path for CIN must be as short as possible for stable switching operation."
      },
      {
        "number": "4",
        "name": "FEEDBACK",
        "type": "input",
        "description": "Feedback sense input. On the ADJ version, connect to the midpoint of the external resistor divider to set VOUT (VREF = 1.23 V). On fixed-output versions (3.3/5/12/15 V), connect this pin directly to the output capacitor."
      },
      {
        "number": "5",
        "name": "~{ON}/OFF",
        "type": "input",
        "description": "Active-low enable input for the regulator. HIGH = OFF (shutdown, ~50 uA typical standby); LOW = ON. Tie to GND to permanently enable the regulator. Do not leave floating. Input voltage range -0.3 V to +VIN."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lm2576.pdf",
        "pages": 45,
        "sha256": "ed17313084806fc0",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lm2576-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          15.0,
          10.0,
          4.42
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "1ac233df7c1bad7d4d7d30dacac2b9b1cb3a45da2a9cc7bb4ea7c95afc8127c1",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Buck (step-down) switching regulator",
      "Output current": "3 A",
      "Output voltage": "5 V fixed (this version)",
      "Input voltage": "Up to 40 V",
      "Switching frequency": "52 kHz typ",
      "Efficiency": "77% typ",
      "Line/load regulation": "Internally compensated",
      "Operating temperature": "-40 C to 125 C (junction)"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "3A buck regulator",
    "step-down converter",
    "simple switcher",
    "5V rail from 12V"
  ],
  "discovery_pitch": "A 3 A buck regulator that needs only an inductor, diode, and caps to step a higher rail down to 5 V.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm2576.kicad_sym",
    "lm2576.kicad_mod",
    "lm2576.glb",
    "lm2576.lbr",
    "docs/hero.png",
    "docs/lm2576-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm2576-etched.step"
  ],
  "variants": [
    {
      "mpn": "LM2576KC",
      "kind": "unknown"
    },
    {
      "mpn": "LM2576KTT",
      "kind": "unknown"
    },
    {
      "mpn": "LM2576KTTR",
      "kind": "unknown"
    }
  ]
}