BD90640EFJ-CE2

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  "type": "component",
  "slug": "bd90640efj-ce2",
  "title": "BD90640EFJ-CE2",
  "brief": "ROHM DC-DC Converters, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
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  "component": {
    "mpn": "BD90640EFJ-CE2",
    "manufacturer": "ROHM",
    "package": "ESOP-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a7317bf6e79199b328e77bb74566ed01.pdf",
    "parts": {
      "symbol": "bd90640efj-ce2.kicad_sym",
      "footprint": "bd90640efj-ce2.kicad_mod",
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      "model_3d_step_plain": "bd90640efj-ce2.step",
      "lbr": "bd90640efj-ce2.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "RT",
        "type": "passive",
        "description": "Switching frequency setting resistor connection. Connect resistor R_RT (22 kΩ-330 kΩ) from RT to GND to set f_SW between 50 kHz and 600 kHz (≈27 kΩ → 500 kHz). Internal reference on RT is ≈0.8 V."
      },
      {
        "number": "2",
        "name": "SW",
        "type": "power_out",
        "description": "Switching output. Drain of the integrated P-ch Power MOSFET (R_ON 0.16 Ω typ). Connect to the external inductor / catch diode node. Rated 4 A max output switch current for BD90640; withstands the full V_IN swing."
      },
      {
        "number": "3",
        "name": "EN/SYNC",
        "type": "input",
        "description": "Enable / external clock synchronization input. IC is enabled when V_EN/SYNC > 2.6 V (typ threshold 1.9 V) and shut down when < 0.8 V. Also accepts an external clock to synchronize the internal oscillator within ±20 % of the RT-programmed frequency. Absolute max V_EN/SYNC ≤ V_IN."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the IC. The HTSOP-J8 exposed thermal pad (backside) is also tied to GND and must be soldered to the PCB ground copper for thermal dissipation (P_D = 3.10 W on recommended board)."
      },
      {
        "number": "5",
        "name": "VC",
        "type": "output",
        "description": "Error amplifier output / loop compensation node. Connect external R-C phase-compensation network from VC to GND. Internal source/sink currents ±54 µA typ; g_m ≈ 270 µA/V. Absolute max 7 V."
      },
      {
        "number": "6",
        "name": "VIN",
        "type": "power_in",
        "description": "Power supply input to the control circuitry. Operating range 3.5 V to 36 V (initial startup > 3.9 V), absolute max 42 V. Must be shorted to PVIN (pin 7) externally per Note 1."
      },
      {
        "number": "7",
        "name": "PVIN",
        "type": "power_in",
        "description": "Power stage supply input feeding the source of the integrated P-ch Power MOSFET. Must be tied to VIN (pin 6) externally. Bypass with a low-ESR ceramic capacitor (≥2.4 µF effective) close to the pin."
      },
      {
        "number": "8",
        "name": "FB",
        "type": "input",
        "description": "Output voltage feedback input to the error amplifier. Regulated to V_REF = 0.800 V (±2 % over −40 °C to +125 °C). Set output voltage with a resistor divider from V_O to FB to GND. Input bias current ±1 µA max; absolute max 7 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/a7317bf6e79199b328e77bb74566ed01.pdf",
        "pages": 43,
        "sha256": "94ffa542eb12f492",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
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        "checked": "2026-10-07",
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        "zmin_mm": -0.0,
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        "checked": "2026-10-07",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "ROHM",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "variants": [
    {
      "mpn": "BD90640EFJ-CE2",
      "kind": "packaging"
    },
    {
      "mpn": "BD90620EFJ-CE2",
      "kind": "unknown"
    },
    {
      "mpn": "BD90610EFJ-CE2",
      "kind": "unknown"
    },
    {
      "mpn": "BD90640HFP-C",
      "kind": "unknown"
    },
    {
      "mpn": "BD90620HFP-C",
      "kind": "unknown"
    }
  ],
  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "BD90640EFJ-CE2 (ROHM) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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    "bd90640efj-ce2.lbr",
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    "docs/bd90640efj-ce2-datasheet.pdf",
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  "visibility": {
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  "updated_at": "2026-09-24T17:42:34.196Z"
}