LM2575S-3.3

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  "type": "component",
  "slug": "lm2575s-3-3",
  "title": "LM2575S-3.3",
  "brief": "UMW DC-DC Converters, TO-263-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "lm2575s-3.3"
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  "component": {
    "mpn": "LM2575S-3.3",
    "manufacturer": "UMW",
    "package": "TO-263-5",
    "pin_count": 6,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2211111030_UMW-Youtai-Semiconductor-Co---Ltd--LM2575S-3-3_C347404.pdf",
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    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply voltage. Operating range 4.75V to 40V for the LM2575 (up to 60V for the HV variant); absolute max 45V (LM2575) / 63V (LM2575HV). Requires a bulk input capacitor (e.g. 680 uF) close to this pin."
      },
      {
        "number": "2",
        "name": "Output",
        "type": "output",
        "description": "Switching output from the internal 2A power transistor. Connects to the catch diode (e.g. 1N5824 Schottky) cathode and the output filter inductor. Saturation voltage ~1.16V at 2A; internal current limit typ. 2.2A."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground return. Also the thermal path for the TO-263 tab; the exposed tab is electrically connected to GND and should be soldered to a copper pour for heatsinking (theta_JA ~20-50 C/W depending on copper area)."
      },
      {
        "number": "4",
        "name": "Feedback",
        "type": "input",
        "description": "Output voltage feedback sense. On the fixed 3.3V version this pin is tied directly to the regulated output node; the internal reference regulates it to 3.3V (Vout tolerance +/-4% over line/load). Feedback bias current 10 nA typ (adjustable variant)."
      },
      {
        "number": "5",
        "name": "ON/OFF",
        "type": "input",
        "description": "Active-low shutdown input. Regulator is ON when the pin is low or left floating (VIL max 1.2V) and enters low-power standby when driven high (VIH min 1.4V, IQ_standby ~50 uA). Input range -0.3V to +VIN; TTL-compatible."
      },
      {
        "number": "6",
        "name": "TAB",
        "type": "power_in",
        "description": "Exposed thermal pad. Present in the package land pattern; connect it per the manufacturer datasheet thermal recommendation. Added because the footprint carries this pad and the symbol had no pin for it.",
        "source": "derived-from-footprint"
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
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        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2211111030_UMW-Youtai-Semiconductor-Co---Ltd--LM2575S-3-3_C347404.pdf",
        "pages": 30,
        "sha256": "b0c31af439f0b6b9",
        "source_tier": "lcsc"
      },
      "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -7.65,
        -3.4
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "TO-263-5_TabPin6@sha256:77e8ff2d643255fc",
      "mark": "drawn"
    },
    "models_3d": [
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        "file": "lm2575s-3-3.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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "UMW",
      "Package": "TO-263-5",
      "Category": "PMIC",
      "Pins": "5"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "b0c31af439f0b6b9",
      "rows": [
        {
          "name": "Output voltage (3.3 V fixed version)",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": 3.135,
          "typ": 3.3,
          "max": 3.465,
          "conditions": "VIN=12V, ILOAD=2A (system parameters, Fig. 1); min/max are full-temperature (bold) limits; 25°C limits 3.168 / 3.432",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Oscillator frequency",
          "symbol": "fO",
          "kind": "electrical",
          "unit": "kHz",
          "min": 42,
          "typ": 52,
          "max": 63,
          "conditions": "VIN=12V, ILOAD=500mA (table header note); full-temperature limits; 25°C limits 47 / 58",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Saturation voltage",
          "symbol": "VSAT",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.16,
          "max": 1.5,
          "conditions": "IOUT=2A (Notes 7, 8); full-temperature limit; 25°C max 1.4",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "ON/OFF pin logic input threshold voltage, high (regulator OFF)",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": 1.4,
          "max": null,
          "conditions": "Full-temperature limit; 25°C min 2.2",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "ON/OFF pin logic input threshold voltage, low (regulator ON)",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.2,
          "max": 0.8,
          "conditions": "Full-temperature limit; 25°C max 1.0",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "ON/OFF pin input current, high (regulator OFF)",
          "symbol": "IH",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 12,
          "max": 30,
          "conditions": "VLOGIC=2.5V (Regulator OFF)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "ON/OFF pin input current, low (regulator ON)",
          "symbol": "IL",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0,
          "max": 10,
          "conditions": "VLOGIC=0.5V (Regulator ON)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Junction to case thermal resistance (TO-220 or TO-263)",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 2,
          "max": null,
          "conditions": "TO-220 or TO-263 package, junction to case",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Junction to ambient thermal resistance, TO-263, 0.5 in² copper",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "TO-263 package tab soldered to single PCB, 0.5 in² of 1 oz copper (Note 12)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Junction to ambient thermal resistance, TO-263, 2.5 in² copper",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 30,
          "max": null,
          "conditions": "TO-263 package tab soldered to single-sided PCB, 2.5 in² of 1 oz copper (Note 13)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Junction to ambient thermal resistance, TO-263, 3 in² copper double-sided",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 20,
          "max": null,
          "conditions": "TO-263 package tab soldered to double-sided PCB, 3 in² of 1 oz copper on LM2575 side (Note 14)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Maximum supply voltage (LM2575, non-HV)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 45,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ON/OFF pin input voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Printed as -0.3 ≤ V ≤ +VIN; upper limit is +VIN (not numeric)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output voltage to ground (steady state)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -1,
          "typ": null,
          "max": null,
          "conditions": "Steady state",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ESD susceptibility, human body model",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "kV",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "Human body model (100 pF through 1.5 kΩ)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature range (operating)",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage (LM2575, non-HV)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_pitch": "LM2575S-3.3 (UMW) component page with datasheet-verified CAD.",
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  "variants": [
    {
      "mpn": "LM2575S-3.3",
      "kind": "packaging"
    },
    {
      "mpn": "LM2575HVS-3.3",
      "kind": "unknown"
    },
    {
      "mpn": "LM2575T-3.3",
      "kind": "unknown"
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      "mpn": "LM2575HVT-3.3",
      "kind": "unknown"
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  "updated_at": "2026-09-25T00:09:14.724Z"
}