LGS5145EP

{
  "schema_version": 1,
  "type": "component",
  "slug": "lgs5145ep",
  "title": "LGS5145EP",
  "brief": "Legend Si DC-DC Converters, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "lgs5145ep"
  ],
  "component": {
    "mpn": "LGS5145EP",
    "manufacturer": "Legend Si",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/84340b478787d0b579406c9173500383.pdf",
    "parts": {
      "symbol": "lgs5145ep.kicad_sym",
      "footprint": "lgs5145ep.kicad_mod",
      "model_3d": "lgs5145ep-etched.glb",
      "model_3d_plain": "lgs5145ep.glb",
      "model_3d_step": "lgs5145ep-etched.step",
      "model_3d_step_plain": "lgs5145ep.step",
      "lbr": "lgs5145ep.lbr"
    },
    "distributor_links": {
      "lcsc": "C22470481"
    },
    "pins": [
      {
        "number": "1",
        "name": "BST",
        "type": "passive",
        "description": "Bootstrap supply pin for the high-side gate driver. A high-quality 100nF ceramic capacitor must be connected between BST and SW to bias the internal high-side MOSFET gate driver. Observe capacitor voltage rating (≥16V recommended)."
      },
      {
        "number": "2",
        "name": "VIN",
        "type": "power_in",
        "description": "Regulator power input, 4.5V-60V. Bypass with a 2.2µF (or larger) ceramic capacitor placed as close as possible between VIN and GND to minimize ringing and EMI."
      },
      {
        "number": "3",
        "name": "EN",
        "type": "input",
        "description": "Regulator enable input. Drive high (>1.4V) to enable the buck output; drive low (<1.0V) to shut down the regulator and enter low-power sleep. Has an internal ~100nA weak pull-down; do not leave floating in noisy environments - tie to VIN for auto-start."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect. Leave floating."
      },
      {
        "number": "5",
        "name": "FB",
        "type": "input",
        "description": "Feedback input to the internal error amplifier. Connect to the tap of an external resistor divider from VOUT to GND; internal reference is 0.812V. VOUT = 0.812 × (RF + RG)/RG; keep RG ≤ 30kΩ. Absolute max FB voltage is -0.3V to 6V."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect. Leave floating."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground return pin. Must be connected to the exposed pad and to the system ground plane through multiple vias for proper thermal and electrical performance."
      },
      {
        "number": "8",
        "name": "SW",
        "type": "output",
        "description": "Internal power-switch node. Connect to the external power inductor, Schottky freewheeling diode (e.g. SS26), and the CBST bootstrap capacitor. Handles the switching waveform at 1.2MHz with peak currents up to 1.7A."
      },
      {
        "number": "9",
        "name": "GND (Exposed Pad)",
        "type": "power_in",
        "description": "Exposed thermal pad on the bottom of the ESOP-8 package. Must be soldered to the PCB ground plane (connected to GND, pin 7) for thermal dissipation and electrical grounding.",
        "source": "renumbered-to-footprint-pad"
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/84340b478787d0b579406c9173500383.pdf",
        "pages": 23,
        "sha256": "b368131b194cf7e0",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm@sha256:5848244c5e72002e",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "lgs5145ep.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lgs5145ep-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3a132138207d2f38e04b8e2206b39a501c8c53fefd5b1192bb4c75e6c7c73c5c",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Legend Si",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "9"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lgs5145ep"
  ],
  "discovery_pitch": "LGS5145EP (Legend Si) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lgs5145ep.kicad_sym",
    "lgs5145ep.kicad_mod",
    "lgs5145ep.glb",
    "lgs5145ep.step",
    "lgs5145ep-etched.step",
    "lgs5145ep.lbr",
    "docs/hero.png",
    "docs/lgs5145ep-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "LGS5145EP",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T23:57:15.055Z"
}