MP9942GJ-Z

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  "slug": "mp9942gj-z",
  "title": "MP9942GJ-Z",
  "brief": "Monolithic Power Systems DC-DC Converters, TSOT-23-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "power management (pmic)",
    "mp9942gj-z",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "MP9942GJ-Z",
    "manufacturer": "Monolithic Power Systems",
    "package": "TSOT-23-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586204373147508736",
    "parts": {
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      "footprint": "mp9942gj-z.kicad_mod",
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      "lbr": "mp9942gj-z.lbr"
    },
    "distributor_links": {
      "lcsc": "C118209"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T18:44:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
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    },
    "pins": [
      {
        "number": "1",
        "name": "PG",
        "type": "output",
        "description": "Open-drain power-good output that goes high when VOUT exceeds 90% of nominal and is pulled low at 84%; it sinks at most 0.3V at 4mA and needs an external pull-up (e.g. 100kΩ) to VCC or another voltage."
      },
      {
        "number": "2",
        "name": "IN",
        "type": "power_in",
        "description": "Supply input for the 4V to 36V continuous operating range; decouple with a ceramic input capacitor placed as close to IN and GND as possible and connect with a wide PCB trace."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "output",
        "description": "Switch output node that drives the inductor; absolute maximum rating is -0.3V to 41V, and it should be connected with a wide PCB trace."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "System ground and reference for the regulated output; connect to a large copper ground plane with vias near the pin."
      },
      {
        "number": "5",
        "name": "BST",
        "type": "passive",
        "description": "Bootstrap pin that, with a capacitor from SW, forms the floating high-side driver supply; a 20Ω series resistor is recommended, and VBS must not exceed VSW+6V."
      },
      {
        "number": "6",
        "name": "EN/SYNC",
        "type": "input",
        "description": "Enable input (high enables, low shuts down; floating shuts down via internal 500kΩ pull-down) that also accepts an external clock from 200kHz to 2.2MHz; it is Zener-clamped at 6.5V and must be limited to 6V or less if driven directly without a pull-up resistor."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal 5V bias regulator output (4.6V to 5.2V at ICC=0mA) that must be decoupled with 0.1µF to 0.22µF and not exceed 0.22µF."
      },
      {
        "number": "8",
        "name": "FB",
        "type": "input",
        "description": "Feedback input connected to the output resistor divider tap, referenced to 0.792V, and it causes frequency fold-back when below 660mV to prevent current-limit runaway during a short."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin 1 PG is an open-drain output; the schema has no open-drain class, so it is typed as 'output'. Pi"
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        "at": "2026-10-18T18:42:31"
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        "sha256": "05378bc62b8ab9d7",
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
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  "metadata": {
    "specs": {
      "Manufacturer": "Monolithic Power Systems",
      "Package": "TSOT-23-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    },
    "appearance": {
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        "quote": "4 GND System Ground. This pin is the reference ground of the regulated output voltage, and PCB layout requires special care. For best results, connect to GND with copper traces and vias.",
        "page": 6,
        "doc": "ds.pdf",
        "material": "copper"
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          "name": "Supply Current (Shutdown)",
          "symbol": "ISHDN",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
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          "max": 8,
          "conditions": "VEN = 0V",
          "source_page": 4,
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        {
          "name": "Supply Current (Quiescent)",
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          "name": "Current Limit",
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          "name": "Oscillator Frequency",
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        {
          "name": "Minimum ON Time",
          "symbol": "tON_MIN",
          "kind": "timing",
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        {
          "name": "Sync Frequency Range",
          "symbol": "fSYNC",
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          "unit": "MHz",
          "min": 0.2,
          "typ": null,
          "max": 2.4,
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          "name": "Feedback Voltage",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "mV",
          "min": 780,
          "typ": 792,
          "max": 804,
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          "typ": 10,
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          "conditions": "VFB=820mV",
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          "name": "EN Rising Threshold",
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          "unit": "V",
          "min": 1.15,
          "typ": 1.4,
          "max": 1.65,
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          "name": "EN Falling Threshold",
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          "min": 1.05,
          "typ": 1.25,
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          "name": "EN Input Current",
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          "conditions": "VEN=2V",
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        {
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          "min": null,
          "typ": 0,
          "max": 0.2,
          "conditions": "VEN=0",
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          "name": "VIN Under-Voltage Lockout Threshold-Rising",
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          "unit": "V",
          "min": 3.3,
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          "name": "VCC Regulator",
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          "min": 4.6,
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          "max": 5.2,
          "conditions": "ICC=0mA",
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        {
          "name": "VCC Load Regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
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          "conditions": "ICC=5mA",
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        {
          "name": "Soft-Start Period",
          "symbol": "tSS",
          "kind": "timing",
          "unit": "ms",
          "min": 0.55,
          "typ": 1.45,
          "max": 2.45,
          "conditions": "VOUT from 10% to 90%",
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        {
          "name": "Thermal Shutdown",
          "symbol": "TSD",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
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          "name": "PG Rising Threshold",
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          "kind": "electrical",
          "unit": "%",
          "min": 86.5,
          "typ": 90,
          "max": 93.5,
          "conditions": "as percentage of VFB",
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          "name": "PG Falling Threshold",
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          "kind": "electrical",
          "unit": "%",
          "min": 80.5,
          "typ": 84,
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          "conditions": "as percentage of VFB",
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        {
          "name": "PG Rising Delay",
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          "unit": "μs",
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          "name": "PG Sink Current Capability",
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          "conditions": "4mA",
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          "name": "Input voltage",
          "symbol": "VIN",
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          "name": "Switch voltage",
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          "name": "All other pins",
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          "name": "Continuous Power Dissipation",
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          "name": "Junction Temperature",
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          "name": "Lead Temperature",
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          "name": "Storage Temperature",
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          "typ": 200,
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          "conditions": "",
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          "name": "Thermal Hysteresis",
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          "name": "PG Threshold Hysteresis",
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          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 6,
          "max": null,
          "conditions": "as percentage of VFB",
          "source_page": 5,
          "source": "datasheet"
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