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Ray Set visibility: public dc16d5f 17d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "ltc3633aeufd-trpbf",
  "title": "LTC3633AEUFD#TRPBF",
  "brief": "Analog Devices DC-DC Converters, QFN-28-EP(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "ltc3633aeufd#trpbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LTC3633AEUFD#TRPBF",
    "manufacturer": "Analog Devices",
    "package": "QFN-28-EP(4x5)",
    "pin_count": 29,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588949412936617984",
    "parts": {
      "symbol": "ltc3633aeufd-trpbf.kicad_sym",
      "footprint": "ltc3633aeufd-trpbf.kicad_mod",
      "model_3d": "ltc3633aeufd-trpbf-hero.glb",
      "model_3d_plain": "ltc3633aeufd-trpbf-etched.glb",
      "model_3d_step": "ltc3633aeufd-trpbf-etched.step",
      "model_3d_step_plain": "ltc3633aeufd-trpbf.step",
      "lbr": "ltc3633aeufd-trpbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C685526"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T00:14:58Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "error",
        "error": "The read operation timed out"
      },
      "mouser": {
        "pn": null,
        "status": "error",
        "error": "The read operation timed out"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PGOOD1",
        "type": "output",
        "description": "Channel 1 open-drain power good output is pulled to ground when VFB1 is outside ±8% (typ) of the 0.6V reference and becomes high impedance once VFB1 is within ±5% (typ)."
      },
      {
        "number": "2",
        "name": "PHMODE",
        "type": "input",
        "description": "Phase select input: tie to ground to switch both channels in phase or to INTVCC for 180° out of phase, and do not float this pin."
      },
      {
        "number": "3",
        "name": "RUN1",
        "type": "input",
        "description": "Channel 1 enable pin: above 1.22V enables the channel, below 1V places it in shutdown, and it must not be floated."
      },
      {
        "number": "4",
        "name": "MODE/SYNC",
        "type": "input",
        "description": "Mode select and external sync input: tie to ground for forced continuous operation, float or tie to INTVCC for Burst Mode operation at light load, or drive with a clock to synchronize switching."
      },
      {
        "number": "5",
        "name": "RT",
        "type": "passive",
        "description": "Oscillator frequency program pin: a resistor between 80k and 640k from this pin to SGND sets 500kHz to 4MHz, and tying it to INTVCC defaults the switching frequency to 2MHz."
      },
      {
        "number": "6",
        "name": "RUN2",
        "type": "input",
        "description": "Channel 2 enable pin: above 1.22V enables the channel, below 1V places it in shutdown, and it must not be floated."
      },
      {
        "number": "7",
        "name": "SGND",
        "type": "power_in",
        "description": "Signal ground that should have a low-noise connection to reference ground, to which the feedback divider, compensation network and RT resistor must be connected."
      },
      {
        "number": "8",
        "name": "PGOOD2",
        "type": "output",
        "description": "Channel 2 open-drain power good output is pulled to ground when VFB2 is outside ±8% (typ) of the 0.6V reference and becomes high impedance once VFB2 is within ±5% (typ)."
      },
      {
        "number": "9",
        "name": "VFB2",
        "type": "input",
        "description": "Channel 2 output feedback input that compares the feedback voltage to the internal 0.6V reference and is connected to a resistor divider to set the output voltage."
      },
      {
        "number": "10",
        "name": "TRACKSS2",
        "type": "input",
        "description": "Channel 2 tracking and soft-start input: forcing a voltage below 0.6V makes the error amplifier servo FB to this voltage, and an internal 1.4µA pull-up from INTVCC allows a soft-start capacitor to SGND."
      },
      {
        "number": "11",
        "name": "ITH2",
        "type": "passive",
        "description": "Channel 2 error amplifier output and loop compensation pin, which should be connected to INTVCC to use the default internal compensation."
      },
      {
        "number": "12",
        "name": "VON2",
        "type": "input",
        "description": "Channel 2 on-time voltage input that sets the on-time comparator trip point, with a VON sense range of 0.6V-6V for LTC3633A (1.5V-12V for LTC3633A-1) and a nominal impedance of 140kΩ."
      },
      {
        "number": "13",
        "name": "SW2",
        "type": "output",
        "description": "Channel 2 switch node connecting to the external inductor, swinging from a diode voltage drop below ground up to VIN."
      },
      {
        "number": "14",
        "name": "SW2",
        "type": "output",
        "description": "Channel 2 switch node connecting to the external inductor, swinging from a diode voltage drop below ground up to VIN."
      },
      {
        "number": "15",
        "name": "VIN2",
        "type": "power_in",
        "description": "Power supply input for the channel 2 on-chip power MOSFETs, which may operate from a supply different from VIN1."
      },
      {
        "number": "16",
        "name": "VIN2",
        "type": "power_in",
        "description": "Power supply input for the channel 2 on-chip power MOSFETs, which may operate from a supply different from VIN1."
      },
      {
        "number": "17",
        "name": "BOOST2",
        "type": "power_out",
        "description": "Boosted floating driver supply for channel 2 whose bootstrap capacitor connects between this pin and SW2, with a normal swing from a diode drop below INTVCC up to VIN+INTVCC."
      },
      {
        "number": "18",
        "name": "V2P5",
        "type": "power_out",
        "description": "2.5V regulator output capable of supplying 10mA that requires a minimum 1µF low-ESR ceramic bypass capacitor, or should be tied to INTVCC if unused."
      },
      {
        "number": "19",
        "name": "INTVCC",
        "type": "power_out",
        "description": "Internal 3.3V regulator output that powers the internal drivers and control circuits and requires a minimum 1µF low-ESR ceramic decoupling capacitor to power ground."
      },
      {
        "number": "20",
        "name": "BOOST1",
        "type": "power_out",
        "description": "Boosted floating driver supply for channel 1 whose bootstrap capacitor connects between this pin and SW1, with a normal swing from a diode drop below INTVCC up to VIN+INTVCC."
      },
      {
        "number": "21",
        "name": "VIN1",
        "type": "power_in",
        "description": "Power supply input for the channel 1 on-chip power MOSFETs, which also powers the internal LDO for INTVCC."
      },
      {
        "number": "22",
        "name": "VIN1",
        "type": "power_in",
        "description": "Power supply input for the channel 1 on-chip power MOSFETs, which also powers the internal LDO for INTVCC."
      },
      {
        "number": "23",
        "name": "SW1",
        "type": "output",
        "description": "Channel 1 switch node connecting to the external inductor, swinging from a diode voltage drop below ground up to VIN."
      },
      {
        "number": "24",
        "name": "SW1",
        "type": "output",
        "description": "Channel 1 switch node connecting to the external inductor, swinging from a diode voltage drop below ground up to VIN."
      },
      {
        "number": "25",
        "name": "VON1",
        "type": "input",
        "description": "Channel 1 on-time voltage input that sets the on-time comparator trip point, with a VON sense range of 0.6V-6V for LTC3633A (1.5V-12V for LTC3633A-1) and a nominal impedance of 140kΩ."
      },
      {
        "number": "26",
        "name": "ITH1",
        "type": "passive",
        "description": "Channel 1 error amplifier output and loop compensation pin, which should be connected to INTVCC to use the default internal compensation."
      },
      {
        "number": "27",
        "name": "TRACKSS1",
        "type": "input",
        "description": "Channel 1 tracking and soft-start input: forcing a voltage below 0.6V makes the error amplifier servo FB to this voltage, and an internal 1.4µA pull-up from INTVCC allows a soft-start capacitor to SGND."
      },
      {
        "number": "28",
        "name": "VFB1",
        "type": "input",
        "description": "Channel 1 output feedback input that compares the feedback voltage to the internal 0.6V reference and is connected to a resistor divider to set the output voltage."
      },
      {
        "number": "29",
        "name": "PGND",
        "type": "power_in",
        "description": "Exposed pad power ground that must be soldered to the PCB for low-impedance electrical contact to power ground and good thermal contact."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The MPN ends in UFD#TRPBF, which is the 28-lead 4mm x 5mm plastic QFN (UFD) package, matching the QF; Pin types are inferred from the function descriptions, since the datasheet does not classify pins. P"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0768,
        "at": "2026-10-18T00:13:31"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588949412936617984",
        "pages": 30,
        "sha256": "6b61ad8d472eb56e",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ltc3633aeufd-trpbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "028686d522379f70cdcac54d7cbc05f7e8d72fe41515288068d2e2da8d27bc8d",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ltc3633aeufd-trpbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "14839bb2f274d0bb054812ddb1c3a7e27dbaa52823d2abb0645993bda0720da5",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Analog Devices",
      "Package": "QFN-28-EP(4x5)",
      "Category": "Power Management (PMIC)",
      "Pins": "29"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "6b61ad8d472eb56e936818b72d41ae614c1df1dba13f00683d00c0626670c83f",
      "rows": [
        {
          "name": "VIN1 Supply Range",
          "symbol": "VIN1",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 3.6,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VIN2 Supply Range",
          "symbol": "VIN2",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": 20,
          "conditions": "3.6V < VIN1 < 20V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Voltage Range (LTC3633A)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0.6,
          "typ": null,
          "max": 6,
          "conditions": "VON = VOUT",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VFB Feedback Reference Voltage",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 0.594,
          "typ": 0.6,
          "max": 0.606,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Feedback Pin Input Current",
          "symbol": "IFB",
          "kind": "electrical",
          "unit": "nA",
          "min": -30,
          "typ": null,
          "max": 30,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Frequency",
          "symbol": "fOSC",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1.4,
          "typ": 2,
          "max": 2.6,
          "conditions": "VRT = INTVCC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Frequency",
          "symbol": "fOSC",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1.7,
          "typ": 2,
          "max": 2.3,
          "conditions": "RT = 162k",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Frequency",
          "symbol": "fOSC",
          "kind": "electrical",
          "unit": "MHz",
          "min": 3.4,
          "typ": 4,
          "max": 4.6,
          "conditions": "RT = 80.6k",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Positive Valley Switch Current Limit",
          "symbol": "ILIM",
          "kind": "electrical",
          "unit": "A",
          "min": 2.6,
          "typ": 3.5,
          "max": 4.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Switch Leakage Current",
          "symbol": "ISW(LKG)",
          "kind": "electrical",
          "unit": "µA",
          "min": -1,
          "typ": 0.01,
          "max": 1,
          "conditions": "VIN = 20V, VRUN = 0V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VIN Overvoltage Lockout Threshold (VIN Rising)",
          "symbol": "VVIN-OV",
          "kind": "electrical",
          "unit": "V",
          "min": 20.3,
          "typ": null,
          "max": 22.5,
          "conditions": "VIN Rising",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VIN Overvoltage Lockout Threshold (VIN Falling)",
          "symbol": "VVIN-OV",
          "kind": "electrical",
          "unit": "V",
          "min": 21.5,
          "typ": null,
          "max": 22.5,
          "conditions": "VIN Falling",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "INTVCC Voltage",
          "symbol": "INTVCC",
          "kind": "electrical",
          "unit": "V",
          "min": 3.1,
          "typ": 3.3,
          "max": 3.5,
          "conditions": "3.6V < VIN < 20V, 0mA Load",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "RUN Threshold Rising",
          "symbol": "RUN",
          "kind": "electrical",
          "unit": "V",
          "min": 1.18,
          "typ": 1.22,
          "max": 1.26,
          "conditions": "Rising",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "RUN Threshold Falling",
          "symbol": "RUN",
          "kind": "electrical",
          "unit": "V",
          "min": 0.98,
          "typ": 1.01,
          "max": 1.04,
          "conditions": "Falling",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "RUN Leakage Current",
          "symbol": "IRUN",
          "kind": "electrical",
          "unit": "µA",
          "min": -3,
          "typ": 0,
          "max": 3,
          "conditions": "VIN = 20V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "V2P5 Voltage",
          "symbol": "V2P5",
          "kind": "electrical",
          "unit": "V",
          "min": 2.46,
          "typ": 2.5,
          "max": 2.54,
          "conditions": "ILOAD = 0mA to 10mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "PGOOD Good-to-Bad Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 8,
          "max": 10,
          "conditions": "VFB Rising",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "PGOOD Good-to-Bad Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": -10,
          "typ": -8,
          "max": null,
          "conditions": "VFB Falling",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "PGOOD Bad-to-Good Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": -5,
          "typ": -3,
          "max": null,
          "conditions": "VFB Rising",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "PGOOD Bad-to-Good Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 3,
          "max": 5,
          "conditions": "VFB Falling",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power Good Filter Time",
          "symbol": "tPGOOD",
          "kind": "electrical",
          "unit": "µs",
          "min": 20,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Internal Soft-Start Time",
          "symbol": "tSS",
          "kind": "electrical",
          "unit": "µs",
          "min": 400,
          "typ": null,
          "max": 700,
          "conditions": "10% to 90% Rise Time",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VFB During Tracking",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 0.28,
          "typ": 0.3,
          "max": 0.315,
          "conditions": "TRACKSS = 0.3V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "PHMODE Threshold Voltage VIH",
          "symbol": "VPHMODE",
          "kind": "electrical",
          "unit": "V",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "VIH",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "PHMODE Threshold Voltage VIL",
          "symbol": "VPHMODE",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "VIL",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "MODE/SYNC Threshold Voltage VIH",
          "symbol": "VMODE/SYNC",
          "kind": "electrical",
          "unit": "V",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "MODE VIH",
          "source_page": 4,
          "source": "datasheet"
        },
        {
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