UM1663S

{
  "schema_version": 1,
  "type": "component",
  "slug": "um1663s",
  "title": "UM1663S",
  "brief": "Union Semiconductor DC-DC Converters, SOT-23-6. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "um1663s"
  ],
  "component": {
    "mpn": "UM1663S",
    "manufacturer": "Union Semiconductor",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2308251149_Union-Semiconductor-UM1663S_C7542878.pdf",
    "parts": {
      "symbol": "um1663s.kicad_sym",
      "footprint": "um1663s.kicad_mod",
      "model_3d": "um1663s-etched.glb",
      "model_3d_plain": "um1663s.glb",
      "model_3d_step": "um1663s-etched.step",
      "model_3d_step_plain": "um1663s.step",
      "lbr": "um1663s.lbr"
    },
    "distributor_links": {
      "lcsc": "C7542878"
    },
    "pins": [
      {
        "number": "1",
        "name": "SW",
        "type": "power_out",
        "description": "Switch pin. Connect the boost inductor and Schottky diode to this pin. Internal NMOS power switch rated to 40V max (Vsw), 1A current limit (typical), Rds(on) ~550 mOhm."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground / power ground. Datasheet symbol listed as GND/PGND; single ground return for the device and internal power switch."
      },
      {
        "number": "3",
        "name": "FB",
        "type": "input",
        "description": "Feedback voltage pin. Regulated to 200mV internal reference (Vref 190-210mV) via an external sense resistor to set LED current. Duty-cycle on SHDN modulates the effective feedback reference for dimming."
      },
      {
        "number": "4",
        "name": "SHDN",
        "type": "input",
        "description": "Active-low chip enable and single-wire PWM/Pulse-mode dimming input. VIH >=1.5V (Vcc=3.7V) / >=1.8V (Vcc=5V); VIL <=0.6V/0.8V. Initial pulse >=2ms selects PWM dimming (500Hz-50kHz); initial pulse <=1.5ms selects 64-step Pulse dimming. Logic low >20ms shuts the device down."
      },
      {
        "number": "5",
        "name": "OVP",
        "type": "input",
        "description": "Overvoltage protection sense pin. Connect to the boost output capacitor; the chip clamps output when the pin exceeds the internal threshold. Default OVP threshold is 38V (spec typ 36V)."
      },
      {
        "number": "6",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply voltage pin. Operating range 2.8V to 5.5V; absolute max -0.3V to +6V. Bypass with a local ceramic capacitor (typ 10uF)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2308251149_Union-Semiconductor-UM1663S_C7542878.pdf",
        "pages": 16,
        "sha256": "da01582bb6963f3e",
        "source_tier": "lcsc"
      },
      "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-6@sha256:f341c73aac9dcb55",
      "mark": "drawn"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Union Semiconductor",
      "Package": "SOT-23-6",
      "Category": "PMIC",
      "Pins": "6"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "um1663s"
  ],
  "discovery_pitch": "UM1663S (Union Semiconductor) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "um1663s.kicad_sym",
    "um1663s.kicad_mod",
    "um1663s.glb",
    "um1663s.step",
    "um1663s-etched.step",
    "um1663s.lbr",
    "docs/hero.png",
    "docs/um1663s-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T13:45:42.286Z"
}