LM2577SX-ADJ

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm2577sx-adj",
  "title": "LM2577SX-ADJ",
  "brief": "Texas Instruments DC-DC Converters, TO-263-5. 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 ics",
    "lm2577sx-adj",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LM2577SX-ADJ",
    "manufacturer": "Texas Instruments",
    "package": "TO-263-5",
    "pin_count": 6,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lm2577sx-adj.pdf",
    "parts": {
      "symbol": "lm2577sx-adj.kicad_sym",
      "footprint": "lm2577sx-adj.kicad_mod",
      "model_3d": "lm2577sx-adj-hero.glb",
      "model_3d_plain": "lm2577sx-adj-etched.glb",
      "model_3d_step": "lm2577sx-adj-etched.step",
      "model_3d_step_plain": "lm2577sx-adj.step",
      "lbr": "lm2577sx-adj.lbr"
    },
    "distributor_links": {
      "lcsc": "C17117",
      "digikey": "LM2577SX-ADJTR-ND",
      "mouser": "926-LM2577SX-ADJ"
    },
    "distributor_check": {
      "checked_at": "2026-10-26T18:40:36Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LM2577SX-ADJTR-ND",
        "status": "found",
        "lifecycle": "Not For New Designs"
      },
      "mouser": {
        "pn": "926-LM2577SX-ADJ",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "passive",
        "description": "Error amplifier output (compensation) pin where the RC/CC network connects; CC of at least 0.22 µF is required for soft start."
      },
      {
        "number": "2",
        "name": "FEEDBACK",
        "type": "input",
        "description": "Error amplifier input that senses the output divider and is compared against the 1.230V internal reference (VOUT = 1.23V(1 + R1/R2))."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin, also connected to the package tab."
      },
      {
        "number": "4",
        "name": "SWITCH",
        "type": "output",
        "description": "Collector of the internal NPN output switch, rated 3.0A operating current and 0V to 60V operating switch voltage."
      },
      {
        "number": "5",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply pin with operating range 3.5V to 40V (45V absolute maximum), to be bypassed to ground with a 0.1 µF capacitor."
      },
      {
        "number": "6",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet shows the tab as GND (Figure 5) but gives no separate tab pin number. The tab is not l; Pin names and functions for COMP, FEEDBACK and SWITCH are inferred from the pin names and applicatio",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 40,
        "cost_usd": 0.9051,
        "at": "2026-10-26T18:40:18"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lm2577sx-adj.pdf",
        "pages": 40,
        "sha256": "5eafda8ce16a4e6f",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 6,
        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lm2577sx-adj.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          15,
          10,
          4.42
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "94c2a3dc1aaad85b6b5193f97d9a7c61b4e28bac25952a1e629557bcf747e246",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm2577sx-adj-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          15,
          10,
          4.42
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "fb9e296f022b602a5810d1a095db5a48e66e2d29e551d4e872aa79e60f6e9476",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TO-263-5",
      "Category": "Power Management ICs",
      "Pins": "6"
    },
    "appearance": {
      "contacts": {
        "quote": "(6) Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper",
        "page": 8,
        "doc": "ds.pdf",
        "material": "copper"
      },
      "version": 1,
      "datasheet_sha256": "5eafda8ce16a4e6f65e2d0a8bdb705c4ff9b9bb99068a3c01ed8429242d6952a"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "5eafda8ce16a4e6f65e2d0a8bdb705c4ff9b9bb99068a3c01ed8429242d6952a",
      "rows": [
        {
          "name": "Output Voltage",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": 11.6,
          "typ": 12,
          "max": 12.4,
          "conditions": "VIN = 5V to 10V, ILOAD = 100 mA to 800 mA (Figure 31 circuit)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Line Regulation",
          "symbol": "ΔVOUT/ΔVIN",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 20,
          "max": 50,
          "conditions": "VIN = 3.5V to 10V, ILOAD = 300 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation",
          "symbol": "ΔVOUT/ΔILOAD",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 20,
          "max": 50,
          "conditions": "VIN = 5V, ILOAD = 100 mA to 800 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Efficiency",
          "symbol": "η",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 80,
          "max": null,
          "conditions": "VIN = 5V, ILOAD = 800 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input Supply Current (switch off)",
          "symbol": "IS",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 7.5,
          "max": 10,
          "conditions": "VFEEDBACK = 1.5V (Switch Off)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input Supply Current (switch on)",
          "symbol": "IS",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 25,
          "max": 50,
          "conditions": "ISWITCH = 2.0A, VCOMP = 2.0V (Max Duty Cycle)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input Supply Undervoltage Lockout",
          "symbol": "VUV",
          "kind": "electrical",
          "unit": "V",
          "min": 2.7,
          "typ": 2.9,
          "max": 3.1,
          "conditions": "ISWITCH = 100 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Frequency",
          "symbol": "fO",
          "kind": "electrical",
          "unit": "kHz",
          "min": 48,
          "typ": 52,
          "max": 56,
          "conditions": "Measured at Switch Pin, ISWITCH = 100 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Reference Voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 1.214,
          "typ": 1.23,
          "max": 1.246,
          "conditions": "Measured at Feedback Pin, VIN = 3.5V to 40V, VCOMP = 1.0V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Reference Voltage Line Regulation",
          "symbol": "ΔVREF/ΔVIN",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 0.5,
          "max": null,
          "conditions": "VIN = 3.5V to 40V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Input Bias Current",
          "symbol": "IB",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 100,
          "max": 300,
          "conditions": "VCOMP = 1.0V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Transconductance",
          "symbol": "GM",
          "kind": "electrical",
          "unit": "μmho",
          "min": 2400,
          "typ": 3700,
          "max": 4800,
          "conditions": "ICOMP = −30 μA to +30 μA, VCOMP = 1.0V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Voltage Gain",
          "symbol": "AVOL",
          "kind": "electrical",
          "unit": "V/V",
          "min": 500,
          "typ": 800,
          "max": null,
          "conditions": "VCOMP = 1.1V to 1.9V, RCOMP = 1.0 MΩ",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error Amplifier Output Swing Upper Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 2.2,
          "typ": 2.4,
          "max": null,
          "conditions": "VFEEDBACK = 1.0V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error Amplifier Output Swing Lower Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.3,
          "max": 0.4,
          "conditions": "VFEEDBACK = 1.5V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Output Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "μA",
          "min": 130,
          "typ": 200,
          "max": 300,
          "conditions": "VFEEDBACK = 1.0V to 1.5V, VCOMP = 1.0V; printed ±",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Soft Start Current",
          "symbol": "ISS",
          "kind": "electrical",
          "unit": "μA",
          "min": 2.5,
          "typ": 5,
          "max": 7.5,
          "conditions": "VFEEDBACK = 1.0V, VCOMP = 0V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Maximum Duty Cycle",
          "symbol": "D",
          "kind": "electrical",
          "unit": "%",
          "min": 93,
          "typ": 95,
          "max": null,
          "conditions": "VCOMP = 1.5V, ISWITCH = 100 mA",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Switch Transconductance",
          "symbol": "ΔISWITCH/ΔVCOMP",
          "kind": "electrical",
          "unit": "A/V",
          "min": null,
          "typ": 12.5,
          "max": null,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Switch Leakage Current",
          "symbol": "IL",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 10,
          "max": 300,
          "conditions": "VSWITCH = 65V, VFEEDBACK = 1.5V (Switch Off)",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Switch Saturation Voltage",
          "symbol": "VSAT",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.5,
          "max": 0.7,
          "conditions": "ISWITCH = 2.0A, VCOMP = 2.0V (Max Duty Cycle)",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "NPN Switch Current Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": 3.7,
          "typ": 4.3,
          "max": 5.3,
          "conditions": "VCOMP = 2.0V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 45,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Switch Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 65,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Switch Current",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "must be externally limited when used as step-up regulator",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Lead Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "Soldering, 10 sec.",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Minimum ESD Rating",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "kV",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "C = 100 pF, R = 1.5 kΩ",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 3.5,
          "typ": null,
          "max": 40,
          "conditions": "Operating Ratings",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Switch Voltage",
          "symbol": "VSWITCH",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 60,
          "conditions": "Operating Ratings",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Switch Current",
          "symbol": "ISWITCH",
          "kind": "recommended_operating",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "Operating Ratings",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature Range",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "LM2577",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction to Ambient",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 37,
          "max": null,
          "conditions": "S Package (DDPAK/TO-263), 1 square inch copper",
          "source_page": 8,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lm2577sx-adj"
  ],
  "discovery_pitch": "LM2577SX-ADJ (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm2577sx-adj.kicad_sym",
    "lm2577sx-adj.kicad_mod",
    "lm2577sx-adj.glb",
    "lm2577sx-adj.step",
    "lm2577sx-adj.lbr",
    "docs/hero.png",
    "docs/lm2577sx-adj-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm2577sx-adj-hero.glb",
    "lm2577sx-adj-hero.overlay.json",
    "lm2577sx-adj-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}