LM3478MAX

{
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  "type": "component",
  "slug": "lm3478max",
  "title": "LM3478MAX",
  "brief": "Texas Instruments DC-DC Converters, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "LM3478MAX",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lm3478max.pdf",
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      "footprint": "lm3478max.kicad_mod",
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      "lbr": "lm3478max.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "ISEN",
        "type": "input",
        "description": "Current sense input pin. Voltage generated across an external sense resistor is fed into this pin. Current sense threshold voltage is typically 156 mV (VIN = 5 V); short-circuit current-limit sense voltage is typically 343 mV. Absolute maximum ISEN pin voltage is 500 mV."
      },
      {
        "number": "2",
        "name": "COMP",
        "type": "output",
        "description": "Compensation pin. A resistor-capacitor combination connected to this pin provides compensation for the control loop (error amplifier output)."
      },
      {
        "number": "3",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26 V at this pin (VFB typical 1.26 V, ±2.5% over temperature). Absolute maximum FB pin voltage is 7 V."
      },
      {
        "number": "4",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground pin. Return for the internal control circuitry and reference. Should be tied to PGND at a single point near the IC."
      },
      {
        "number": "5",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin. Return for the internal MOSFET gate driver; carries the peak driver currents (up to 1 A). Route separately from AGND back to a single ground reference point."
      },
      {
        "number": "6",
        "name": "DR",
        "type": "output",
        "description": "Drive pin. The gate of the external N-channel MOSFET should be connected to this pin. Internal push-pull driver with 1 A peak capability. Drive voltage swings to VIN (VIN < 7.2 V) or clamped at 7.2 V (VIN ≥ 7.2 V). Absolute maximum VDR is 8 V."
      },
      {
        "number": "7",
        "name": "FA/SD",
        "type": "input",
        "description": "Frequency Adjust and Shutdown pin. A resistor connected to this pin sets the oscillator frequency (100 kHz to 1 MHz; RFA = 40 kΩ gives 400 kHz nominal). A high level on this pin for longer than 30 µs will turn the device off; in shutdown the device draws less than 10 µA from the supply. Absolute maximum VFA/SD is 7 V."
      },
      {
        "number": "8",
        "name": "VIN",
        "type": "power_in",
        "description": "Power Supply Input pin. Operating range 2.97 V to 40 V (absolute maximum 45 V). Undervoltage lockout at 2.85 V typical with 170 mV hysteresis. Non-switching supply current typically 2.7 mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lm3478max.pdf",
        "pages": 41,
        "sha256": "a36ddadf5018c4d9",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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    "pin1": {
      "pad": "1",
      "at": [
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        -1.905
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      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
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        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          4.9,
          1.75
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
    "lm3478max"
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  "discovery_pitch": "LM3478MAX (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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    "lm3478max-etched.step",
    "lm3478max.lbr",
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  "visibility": {
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  "variants": [
    {
      "mpn": "LM3478MAX",
      "kind": "packaging"
    },
    {
      "mpn": "LM3478MAXMM",
      "kind": "packaging"
    },
    {
      "mpn": "LM3478MAXMMX",
      "kind": "packaging"
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  ],
  "updated_at": "2026-09-28T16:41:06.752Z"
}