TX4121

{
  "schema_version": 1,
  "type": "component",
  "slug": "tx4121",
  "title": "TX4121",
  "brief": "XDS 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",
    "tx4121"
  ],
  "component": {
    "mpn": "TX4121",
    "manufacturer": "XDS",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/58ebfdc9f832bc68cc8e4c8730fcd71b.pdf",
    "parts": {
      "symbol": "tx4121.kicad_sym",
      "footprint": "tx4121.kicad_mod",
      "model_3d": "tx4121-etched.glb",
      "model_3d_plain": "tx4121.glb",
      "model_3d_step": "tx4121-etched.step",
      "model_3d_step_plain": "tx4121.step",
      "lbr": "tx4121.lbr"
    },
    "distributor_links": {
      "lcsc": "C329268"
    },
    "pins": [
      {
        "number": "1",
        "name": "BST",
        "type": "passive",
        "description": "Bootstrap driver pin for the high-side MOSFET gate drive. Connect a 0.1 µF (or larger) ceramic capacitor between BST and SW to develop the high-side gate drive rail."
      },
      {
        "number": "2",
        "name": "VDD",
        "type": "power_in",
        "description": "Chip power / converter input supply. Operating range 6.5V to 36V, absolute max 36V. Bypass locally to GND with low-ESR ceramic input capacitors."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "power_out",
        "description": "Switching node output - drain junction of the internal high-side and low-side power MOSFETs. Connect to the external inductor. Delivers up to 3.1 A continuous."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground / power return. Tie to the ground plane together with the EP thermal pad for best thermal and electrical performance."
      },
      {
        "number": "5",
        "name": "FB",
        "type": "input",
        "description": "Feedback sense input for the output voltage divider. Regulated to VFB = 0.9 V typical; output OVP threshold VFB_OVP = 0.99 V. Absolute max −0.3 V to 6 V."
      },
      {
        "number": "6",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output / loop compensation node. Connect an R-C (and optional second C) network from COMP to GND to shape the control-loop response. Source ~5.2 µA, sink ~3.2 µA."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "Enable input, active-high, with an internal high-value pull-up (~1.6 µA input current). VIH ≥ 1.2 V, VIL ≤ 1.1 V. Absolute max −0.3 V to 6 V. Leave floating or tie high to enable; pull to GND to shut down."
      },
      {
        "number": "8",
        "name": "SST",
        "type": "input",
        "description": "Programmable soft-start input. Connect a capacitor from SST to GND; the pin is charged by an internal ~2.3 µA source, ramping the internal reference to control output-voltage rise time and inrush current. Absolute max −0.3 V to 6 V."
      },
      {
        "number": "9",
        "name": "EP",
        "type": "passive",
        "description": "Exposed thermal pad on the bottom of the ESOP-8 package. Solder to a large copper ground pour for heat sinking; electrically tie to GND (pin 4). θJA ≈ 56 °C/W, θJC ≈ 45 °C/W."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/58ebfdc9f832bc68cc8e4c8730fcd71b.pdf",
        "pages": 12,
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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    "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"
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
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        "checked": "2026-10-07",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "XDS",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "9"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "d852293a9e759d95",
      "rows": [
        {
          "name": "EN pin voltage",
          "symbol": "EN",
          "kind": "absolute_maximum",
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          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "SST pin voltage",
          "symbol": "SST",
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          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
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        },
        {
          "name": "FB pin voltage",
          "symbol": "FB",
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          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
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        },
        {
          "name": "Operating voltage (VDD)",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 6.5,
          "typ": null,
          "max": 36,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Output current",
          "symbol": "IOUT",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": 0,
          "typ": null,
          "max": 3.1,
          "conditions": "",
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        },
        {
          "name": "Operating junction temperature",
          "symbol": "JT",
          "kind": "recommended_operating",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "工作结温度",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Start-up minimum input voltage (UVLO rising)",
          "symbol": "VUVLO_up",
          "kind": "electrical",
          "unit": "V",
          "min": 6.5,
          "typ": null,
          "max": null,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "EN high voltage",
          "symbol": "V_EN_H",
          "kind": "electrical",
          "unit": "V",
          "min": 1.2,
          "typ": null,
          "max": null,
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        },
        {
          "name": "EN low voltage",
          "symbol": "V_EN_L",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.1,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "High-side switch leakage current",
          "symbol": "I_leak_sw",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 0,
          "max": 10,
          "conditions": "VEN = 0V, VSW= 0V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Shutdown voltage (UVLO falling)",
          "symbol": "VUVLO_down",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 6,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "UVLO hysteresis",
          "symbol": "VUVLO_hys",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.5,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "VFB=1.1V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Oscillator frequency",
          "symbol": "Fosc",
          "kind": "electrical",
          "unit": "KHz",
          "min": null,
          "typ": 300,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Feedback voltage",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.9,
          "max": null,
          "conditions": "4.5≤VIN≤36V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Feedback overvoltage threshold",
          "symbol": "VFB_OVP",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.99,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum duty cycle",
          "symbol": "D_MAX",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 94,
          "max": null,
          "conditions": "（注）由设计保证，未在生产中测试",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Minimum on-time",
          "symbol": "Ton",
          "kind": "electrical",
          "unit": "ns",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "（注）由设计保证，未在生产中测试",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High-side switch current limit",
          "symbol": "Hs_Iocl",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 5.9,
          "max": null,
          "conditions": "最小占空比",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low-side switch current limit",
          "symbol": "Ls_Iocl",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 5.5,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input overvoltage protection threshold",
          "symbol": "Vinovp",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 33,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal shutdown temperature",
          "symbol": "TH_SD",
          "kind": "electrical",
          "unit": "℃",
          "min": null,
          "typ": 155,
          "max": null,
          "conditions": "（注）由设计保证，未在生产中测试",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal shutdown hysteresis",
          "symbol": "TH_sdhys",
          "kind": "electrical",
          "unit": "℃",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "（注）由设计保证，未在生产中测试",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High-side switch on-resistance",
          "symbol": "RDS(ON)_H",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": 79,
          "max": null,
          "conditions": "IOUT = 1A，VOUT = 3.3V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Low-side switch on-resistance",
          "symbol": "RDS(ON)_L",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": 62,
          "max": null,
          "conditions": "IOUT = 1A, VOUT = 3.3V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN input current",
          "symbol": "I_EN_IN",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 1.6,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Soft-start charging current",
          "symbol": "I_SST_CHG",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 2.3,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Compensation source current",
          "symbol": "I_COMP_SRC",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 5.2,
          "max": null,
          "conditions": "VFB=1.0V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Compensation sink current",
          "symbol": "I_COMP_SNK",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 3.2,
          "max": null,
          "conditions": "VFB=0.8V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance (ESOP8)",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "℃W",
          "min": null,
          "typ": 56,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case thermal resistance (ESOP8)",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "℃W",
          "min": null,
          "typ": 45,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
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  "updated_at": "2026-09-25T13:16:09.548Z"
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