ETA9351Q4Y

{
  "schema_version": 1,
  "type": "component",
  "slug": "eta9351q4y",
  "title": "ETA9351Q4Y",
  "brief": "etasolution Power Management - Specialized, QFN-24L-EP(4x4). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "eta9351q4y"
  ],
  "component": {
    "mpn": "ETA9351Q4Y",
    "manufacturer": "etasolution",
    "package": "QFN-24L-EP(4x4)",
    "pin_count": 25,
    "category": "Power Management (PMIC)",
    "subcategory": "Power Management - Specialized",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/9460fa99f6f4a4d31e6dcb63333fc055.pdf",
    "parts": {
      "symbol": "eta9351q4y.kicad_sym",
      "footprint": "eta9351q4y.kicad_mod",
      "model_3d": "eta9351q4y-etched.glb",
      "model_3d_plain": "eta9351q4y.glb",
      "model_3d_step": "eta9351q4y-etched.step",
      "model_3d_step_plain": "eta9351q4y.step",
      "lbr": "eta9351q4y.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "PGND3",
        "type": "power_in",
        "description": "Power ground for Channel 3 buck converter. Return path for the low-side NMOS switch current; route with a low-impedance connection to the input/output capacitor grounds."
      },
      {
        "number": "2",
        "name": "EN3",
        "type": "input",
        "description": "Enable input for Channel 3. Drive high (>1.5 V) to enable the channel, low (<0.4 V) to disable. EN input current ~1 uA."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. Per the PCB Layout Guide (page 7) this pin is used as a routing island; PGND2 (pin 11) is jumpered through the exposed pad to pin 3 to shorten the Channel 2 input capacitor return path."
      },
      {
        "number": "4",
        "name": "VIN2",
        "type": "power_in",
        "description": "Input supply voltage for Channel 2 (2.6 V to 5.5 V). Bypass with a 22 uF ceramic capacitor to PGND2 and a 10 nF capacitor to AGND2."
      },
      {
        "number": "5",
        "name": "SW2",
        "type": "output",
        "description": "Switching node for Channel 2. Connect a 1 uH inductor between SW2 and VOS2. Internally driven by the high-side PMOS and low-side NMOS power switches; SW current is internally limited (~4.5 A typ)."
      },
      {
        "number": "6",
        "name": "EN2",
        "type": "input",
        "description": "Enable input for Channel 2. Drive high (>1.5 V) to enable the channel, low (<0.4 V) to disable."
      },
      {
        "number": "7",
        "name": "VIN1",
        "type": "power_in",
        "description": "Input supply voltage for Channel 1 (2.6 V to 5.5 V). Bypass with a 22 uF ceramic capacitor to PGND1 and a 10 nF capacitor to AGND1."
      },
      {
        "number": "8",
        "name": "EN1",
        "type": "input",
        "description": "Enable input for Channel 1. Drive high (>1.5 V) to enable the channel, low (<0.4 V) to disable."
      },
      {
        "number": "9",
        "name": "PGND1",
        "type": "power_in",
        "description": "Power ground for Channel 1 buck converter. Return path for the low-side NMOS switch current."
      },
      {
        "number": "10",
        "name": "SW1",
        "type": "output",
        "description": "Switching node for Channel 1. Connect a 1 uH inductor between SW1 and VOS1."
      },
      {
        "number": "11",
        "name": "PGND2",
        "type": "power_in",
        "description": "Power ground for Channel 2 buck converter. Per the PCB Layout Guide, route through the bottom exposed heat-dissipation pad over to pin 3 to shorten the Channel 2 input capacitor return path."
      },
      {
        "number": "12",
        "name": "FB1",
        "type": "input",
        "description": "Feedback input for Channel 1. Connect an external resistor divider from VOUT1 to FB1 and AGND1 to program the output between 0.45 V and VIN1. Regulation threshold is 0.45 V (0.441 V / 0.459 V min/max); input current ~0.01 uA."
      },
      {
        "number": "13",
        "name": "AGND1",
        "type": "power_in",
        "description": "Analog ground for Channel 1. Keep quiet by adding a 10 nF ceramic capacitor from VIN1 to AGND1."
      },
      {
        "number": "14",
        "name": "VOS1",
        "type": "input",
        "description": "Output voltage sense input for Channel 1. Connect directly to the Channel 1 regulated output node (post-inductor) for the internal on-time / voltage-mode control loop."
      },
      {
        "number": "15",
        "name": "FB2",
        "type": "input",
        "description": "Feedback input for Channel 2. Connect an external resistor divider from VOUT2 to FB2 and AGND2 to program the output between 0.45 V and VIN2."
      },
      {
        "number": "16",
        "name": "AGND2",
        "type": "power_in",
        "description": "Analog ground for Channel 2. Add a 10 nF ceramic capacitor from VIN2 to AGND2 to keep this reference quiet."
      },
      {
        "number": "17",
        "name": "VOS2",
        "type": "input",
        "description": "Output voltage sense input for Channel 2. Connect directly to the Channel 2 regulated output node."
      },
      {
        "number": "18",
        "name": "FB3",
        "type": "input",
        "description": "Feedback input for Channel 3. Connect an external resistor divider from VOUT3 to FB3 and AGND3 to program the output between 0.45 V and VIN3."
      },
      {
        "number": "19",
        "name": "AGND3",
        "type": "power_in",
        "description": "Analog ground for Channel 3. Add a 10 nF ceramic capacitor from VIN3 to AGND3 to keep this reference quiet."
      },
      {
        "number": "20",
        "name": "VOS3",
        "type": "input",
        "description": "Output voltage sense input for Channel 3. Connect directly to the Channel 3 regulated output node."
      },
      {
        "number": "21",
        "name": "PG3",
        "type": "output",
        "description": "Power-Good open-drain output for Channel 3. High-impedance when VOUT3 is within regulation (rising threshold 90% of nominal, 2.5% hysteresis); pulls low (VOL <=0.4 V at 1 mA sink) when VOUT3 is below its nominal value. The external pull-up must not exceed VIN3."
      },
      {
        "number": "22",
        "name": "SW3",
        "type": "output",
        "description": "Switching node for Channel 3. Connect a 1 uH inductor between SW3 and VOS3."
      },
      {
        "number": "23",
        "name": "PVIN3",
        "type": "power_in",
        "description": "Power input supply for Channel 3 (2.6 V to 5.5 V). Feeds the Channel 3 high-side PMOS power switch. Bypass with a 22 uF ceramic capacitor to PGND3 and a 10 nF capacitor to AGND3; tie together with AVIN3."
      },
      {
        "number": "24",
        "name": "AVIN3",
        "type": "power_in",
        "description": "Analog input supply for Channel 3 (2.6 V to 5.5 V). Feeds the Channel 3 analog/control circuitry. Bypass with a 22 uF ceramic capacitor to PGND3 and a 10 nF capacitor to AGND3; typically tied to PVIN3."
      },
      {
        "number": "25",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal pad on the bottom of the QFN-24 package. Must be soldered to the PCB ground plane for electrical ground and thermal dissipation (theta-JA = 30 degC/W). Also serves as a routing plane between PGND2 (pin 11) and pin 3 per the PCB Layout Guide."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/9460fa99f6f4a4d31e6dcb63333fc055.pdf",
        "pages": 9,
        "sha256": "b31a7ee0be5fc574",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 25,
        "described": 25,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
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        "checked": "2026-10-07",
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      {
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        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "etasolution",
      "Package": "QFN-24L-EP(4x4)",
      "Category": "Power Management (PMIC)",
      "Pins": "25"
    }
  },
  "variants": [
    {
      "mpn": "ETA9351Q4Y",
      "kind": "packaging"
    }
  ],
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  "discovery_pitch": "ETA9351Q4Y (etasolution) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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  "visibility": {
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  "updated_at": "2026-09-24T20:28:34.238Z"
}