BL9342

{
  "schema_version": 1,
  "type": "component",
  "slug": "bl9342",
  "title": "BL9342",
  "brief": "BL Shanghai Belling 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",
    "bl9342"
  ],
  "component": {
    "mpn": "BL9342",
    "manufacturer": "BL Shanghai Belling",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/f7923384011fcd7e512634d5f97e2795.pdf",
    "parts": {
      "symbol": "bl9342.kicad_sym",
      "footprint": "bl9342.kicad_mod",
      "model_3d": "bl9342-etched.glb",
      "model_3d_plain": "bl9342.glb",
      "model_3d_step": "bl9342-etched.step",
      "model_3d_step_plain": "bl9342.step",
      "lbr": "bl9342.lbr"
    },
    "distributor_links": {
      "lcsc": "C93176"
    },
    "pins": [
      {
        "number": "1",
        "name": "BST",
        "type": "passive",
        "description": "Bootstrap pin. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor (typ. 100 nF) between BST and SW; capacitor is charged from an internal regulator to ~5 V."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground. Route as close as possible to the output capacitor return and away from high-current switching paths."
      },
      {
        "number": "3",
        "name": "FB",
        "type": "input",
        "description": "Feedback input to the internal error amplifier. An external resistor divider from VOUT to GND sets the regulated output voltage, compared against the internal 0.794 V (typ. 0.8 V) reference. Recommended R1 ≈ 124 kΩ for optimal loop response."
      },
      {
        "number": "4",
        "name": "EN",
        "type": "input",
        "description": "Enable input, active high. VIH ≥ 1.6 V (typ. 2.0 V) turns the chip on; pulling below the threshold shuts it down. Hysteresis 0.6 V. Internally pulled to GND so floating EN disables the part; do not leave floating in operation."
      },
      {
        "number": "5",
        "name": "VIN",
        "type": "power_in",
        "description": "Power supply input, 4.2 V to 40 V (absolute max 43 V). Supplies all internal control circuitry and the integrated high-side power MOSFET. Decouple to GND with a low-ESR capacitor (e.g. 4.7 µF/50 V) placed close to the pin to minimise switching spikes."
      },
      {
        "number": "6",
        "name": "SW",
        "type": "output",
        "description": "Switch node output from the internal high-side power MOSFET (RDS(on) ≈ 500 mΩ). Connect the inductor here and place a low-VF Schottky freewheeling diode from SW to GND close to the pin. Rated up to VIN (max 40 V)."
      }
    ],
    "provenance": {
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
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        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
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    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-6@sha256:f341c73aac9dcb55",
      "mark": "drawn"
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c9fe686b4d1b56927a41fa84a9bc1efb61d8a45a123a3db43bcaa05c2891d635",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "BL Shanghai Belling",
      "Package": "SOT-23-6",
      "Category": "PMIC",
      "Pins": "6"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "f05713c35e4f834e",
      "rows": [
        {
          "name": "Feedback voltage",
          "symbol": "Vfb",
          "kind": "electrical",
          "unit": "V",
          "min": 0.794,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Switch on-resistance",
          "symbol": "Rsw",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "Vbst-Vsw=5V",
          "source_page": 4,
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        },
        {
          "name": "Switch leakage current",
          "symbol": "Iswleak",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 0.1,
          "max": 1,
          "conditions": "Ven=0V, Vsw=0V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current limit",
          "symbol": "Ilim",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "",
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        },
        {
          "name": "Transconductance COMP to SENSE",
          "symbol": "Gcs",
          "kind": "electrical",
          "unit": "A/V",
          "min": null,
          "typ": 3,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Minimum operating voltage",
          "symbol": "Vin min",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.2,
          "typ": null,
          "max": null,
          "conditions": "",
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        },
        {
          "name": "Input undervoltage lockout threshold",
          "symbol": "Vin(UVLO)",
          "kind": "electrical",
          "unit": "V",
          "min": 3.3,
          "typ": null,
          "max": 4.2,
          "conditions": "",
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        },
        {
          "name": "Undervoltage lockout hysteresis",
          "symbol": "Vin(UVLO)hys",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.8,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Soft-start time",
          "symbol": "Tss",
          "kind": "timing",
          "unit": "msec",
          "min": null,
          "typ": 0.5,
          "max": null,
          "conditions": "FB from 0 to 1.8V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Oscillator frequency",
          "symbol": "Fosc",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
          "typ": 1.8,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Minimum switch on-time",
          "symbol": "Ton min",
          "kind": "timing",
          "unit": "ns",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Shutdown current",
          "symbol": "Isd",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 3,
          "max": 15,
          "conditions": "Ven<0.3V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current",
          "symbol": "Isq",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 200,
          "max": null,
          "conditions": "Vfb=0.9V, no load",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal shutdown",
          "symbol": "Temp",
          "kind": "electrical",
          "unit": "℃",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN high-level threshold",
          "symbol": "Venh",
          "kind": "electrical",
          "unit": "V",
          "min": 1.6,
          "typ": null,
          "max": 2,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN hysteresis",
          "symbol": "En hys",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.6,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage VIN (absolute maximum)",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 43,
          "conditions": "",
          "source_page": 3,
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        },
        {
          "name": "Switch voltage VSW (absolute maximum)",
          "symbol": "VSW",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Maximum printed as VIN(MAX)+0.3V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "BST to SW voltage (absolute maximum)",
          "symbol": "BST to SW",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Other pins voltage (absolute maximum)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5,
          "conditions": "Other pins",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Continuous power dissipation",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.57,
          "conditions": "TA=+25℃",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature (absolute maximum)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
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          "conditions": "",
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        {
          "name": "Lead temperature (absolute maximum)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "",
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        {
          "name": "Storage temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
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        },
        {
          "name": "Supply voltage VIN (recommended)",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.2,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 3,
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        },
        {
          "name": "SW terminal voltage (recommended)",
          "symbol": "VOUT",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "Up to 40V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-to-ambient, SOT23-6L",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": 220,
          "max": null,
          "conditions": "SOT23-6L",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-to-case, SOT23-6L",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "℃/W",
          "min": null,
          "typ": 110,
          "max": null,
          "conditions": "SOT23-6L",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
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  "discovery_pitch": "BL9342 (BL Shanghai Belling) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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  "updated_at": "2026-09-24T17:58:31.545Z"
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