TD1591

{
  "schema_version": 1,
  "type": "component",
  "slug": "td1591",
  "title": "TD1591",
  "brief": "Techcode Semicon DC-DC Converters, SOIC-8. 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",
    "td1591",
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  "component": {
    "mpn": "TD1591",
    "manufacturer": "Techcode Semicon",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a5e222e75aec4ee784d6a25e04383676.pdf",
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      "lbr": "td1591.lbr"
    },
    "distributor_links": {
      "lcsc": "C114289"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T23:24:28Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected; leave this pin unconnected."
      },
      {
        "number": "2",
        "name": "Vin",
        "type": "power_in",
        "description": "Supply voltage input; the TD1591 operates from a 3.6V to 32V DC supply, and Vin should be bypassed to GND with a suitably large capacitor to eliminate input noise."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "output",
        "description": "Power switch output and switch node that supplies power to the output; keep the PC board copper on this node to a minimum to limit coupling into sensitive circuitry."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; it must be placed outside the Schottky diode to output capacitor ground path so switching current spikes do not induce voltage noise into the TD1591."
      },
      {
        "number": "5",
        "name": "FB",
        "type": "input",
        "description": "Feedback input that senses the output voltage through an external resistor divider and regulates it to a feedback threshold voltage of 1.222V."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected; leave this pin unconnected."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "Digital enable input that turns the regulator on when driven high and off when driven low."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected; leave this pin unconnected."
      }
    ],
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin table lists pins 1, 6 and 8 together as NC (Not Connect); each is recorded as a separate unc; Figure 2 (top-view pin configuration) is an image and is not present in the extracted text, so the p; The datasheet does not give a formal electrical type for SW; 'output' was assigned because it is des"
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        "at": "2026-10-28T23:24:13"
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      "pins": {
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        "described": 8,
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  "metadata": {
    "specs": {
      "Manufacturer": "Techcode Semicon",
      "Package": "SOIC-8",
      "Category": "Power Management ICs",
      "Pins": "8"
    },
    "appearance": {
      "contacts": {
        "quote": "this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the",
        "page": 11,
        "doc": "ds.pdf",
        "material": "copper"
      },
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    "characteristics": {
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          "min": 3.6,
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          "max": 32,
          "conditions": "",
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        },
        {
          "name": "Shutdown Supply Current",
          "symbol": "ISTBY",
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          "unit": "uA",
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          "max": 90,
          "conditions": "VEN=0V",
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        {
          "name": "Supply Current",
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          "kind": "electrical",
          "unit": "mA",
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          "max": 4,
          "conditions": "VEN=2V, VFB=1.3V",
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        },
        {
          "name": "Feedback Voltage",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 1.185,
          "typ": 1.222,
          "max": 1.26,
          "conditions": "VIN = 3.6V to 28V",
          "source_page": 5,
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        },
        {
          "name": "Feedback Bias Current",
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        {
          "name": "Switch Current Limit",
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        {
          "name": "Oscillator Frequency",
          "symbol": "FOSC",
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          "unit": "KHz",
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          "typ": 380,
          "max": 440,
          "conditions": "",
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        },
        {
          "name": "EN Pin Threshold",
          "symbol": "VEN",
          "kind": "electrical",
          "unit": "V",
          "min": 0.7,
          "typ": 1.2,
          "max": 1.7,
          "conditions": "VIN =12V, VFB=0V",
          "source_page": 5,
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          "name": "EN Pin Input Leakage Current (high)",
          "symbol": "IH",
          "kind": "electrical",
          "unit": "uA",
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          "max": -1,
          "conditions": "VEN=2.5V",
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        {
          "name": "EN Pin Input Leakage Current (low)",
          "symbol": "IL",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": -3,
          "max": -10,
          "conditions": "VEN=0.5V",
          "source_page": 5,
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        },
        {
          "name": "Max. Duty Cycle",
          "symbol": "DMAX",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VFB=0V, ISW=0.1A",
          "source_page": 5,
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        {
          "name": "Input Voltage (absolute maximum)",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 32,
          "conditions": "",
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        {
          "name": "Feedback Pin Voltage",
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          "typ": null,
          "max": null,
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        {
          "name": "Enable Pin Voltage",
          "symbol": "VEN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 12,
          "conditions": "",
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        {
          "name": "Switch Pin Voltage",
          "symbol": "VSW",
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          "unit": "V",
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          "typ": null,
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        {
          "name": "Operating Junction Temperature (absolute maximum)",
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          "unit": "ºC",
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        {
          "name": "Storage Temperature",
          "symbol": "TSTG",
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          "unit": "ºC",
          "min": -65,
          "typ": null,
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        {
          "name": "Lead Temperature (Soldering)",
          "symbol": "TLEAD",
          "kind": "absolute_maximum",
          "unit": "ºC",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "Soldering, 10 sec",
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        {
          "name": "ESD (HBM)",
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          "name": "Input Voltage (recommended)",
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        {
          "name": "Operating Ambient Temperature",
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          "unit": "ºC",
          "min": -10,
          "typ": null,
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        {
          "name": "Thermal Resistance Junction to Ambient",
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          "kind": "thermal",
          "unit": "ºC / W",
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        {
          "name": "Thermal Resistance Junction to Case",
          "symbol": "RθJC",
          "kind": "thermal",
          "unit": "ºC / W",
          "min": null,
          "typ": 45,
          "max": null,
          "conditions": "",
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        {
          "name": "Frequency of Current Limit or Short Circuit Protection",
          "symbol": "FOSC1",
          "kind": "electrical",
          "unit": "KHz",
          "min": null,
          "typ": 42,
          "max": null,
          "conditions": "VFB=0V",
          "source_page": 5,
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        {
          "name": "Internal PMOS RDSON",
          "symbol": "RDSON",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": 80,
          "max": null,
          "conditions": "VIN =12V, VFB=0V; VEN=12V, Iout=2A",
          "source_page": 5,
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        {
          "name": "Efficiency",
          "symbol": "η",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 92,
          "max": null,
          "conditions": "VIN=12V, Vout=5V; Iout=2A",
          "source_page": 5,
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        {
          "name": "Thermal Shutdown",
          "symbol": "TOTSD",
          "kind": "electrical",
          "unit": "ºC",
          "min": null,
          "typ": 165,
          "max": null,
          "conditions": "",
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      ]
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