LT8355IUFDM-1#WTRPBF

{
  "slug": "lt8355iufdm-1-wtrpbf",
  "version": "0.1.0",
  "type": "component",
  "description": "ANALOG DEVICES Global Sourcing Parts, QFN-28(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
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    "global sourcing parts",
    "lt8355iufdm-1#wtrpbf",
    "factory-2.0.0",
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  "component": {
    "mpn": "LT8355IUFDM-1#WTRPBF",
    "manufacturer": "ANALOG DEVICES",
    "package": "QFN-28(4x5)",
    "pin_count": 29,
    "category": "Global Sourcing Parts",
    "subcategory": "Global Sourcing Parts",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/lt8355-1.pdf",
    "parts": {
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      "footprint": "lt8355iufdm-1-wtrpbf.kicad_mod",
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      "lbr": "lt8355iufdm-1-wtrpbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C7458515",
      "digikey": "505-LT8355IUFDM-1#WTRPBFTR-ND",
      "mouser": "584-LT8355IUFDM1#WTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T16:07:45Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-LT8355IUFDM-1#WTRPBFTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT8355IUFDM1#WTR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PWMTG1",
        "type": "output",
        "description": "High side gate driver for the external series PMOS switch of channel 1, driving the gate between ISP1 - 8.5V and ISP1 and limited to 8.5V typical below ISP1."
      },
      {
        "number": "2",
        "name": "ISN1",
        "type": "input",
        "description": "Kelvin connect to the low side of the channel 1 LED current sense resistor RILED1; current is 250mV/RILED1 while CTRL1 is above 1.5V."
      },
      {
        "number": "3",
        "name": "ISP1",
        "type": "input",
        "description": "Kelvin connect to the high side of the channel 1 LED current sense resistor; if VISP - VISN exceeds about 670mV typical, switching stops and PWMTG1 goes high."
      },
      {
        "number": "4",
        "name": "FB1",
        "type": "input",
        "description": "Channel 1 output voltage feedback from a resistive divider; regulates to about 1.2V typical, overvoltage at 1.26V typical, and shorted LED detected below 300mV typical."
      },
      {
        "number": "5",
        "name": "VC1",
        "type": "passive",
        "description": "Internal error amplifier compensation node for channel 1; connect a capacitor or RC network between this pin and ground."
      },
      {
        "number": "6",
        "name": "CTRL1",
        "type": "input",
        "description": "Analog dimming input for channel 1; LED current is (CTRL1 - 500mV)/(4RILED1) when CTRL1 is between 500mV and 1.5V."
      },
      {
        "number": "7",
        "name": "FAULT1",
        "type": "output",
        "description": "Open-drain fault indication for channel 1 short LED, open LED, overvoltage and overcurrent faults; tie through 100k to INTVCC or a supply below 15V."
      },
      {
        "number": "8",
        "name": "CTRL2",
        "type": "input",
        "description": "Analog dimming input for channel 2 used with IADJ2; current is [(CTRL2 - 0.48V) x (IADJ2 - 0.5V) - 0.02V]/(4RILED2) when CTRL2 and IADJ2 are between 0.5V and 1.5V."
      },
      {
        "number": "9",
        "name": "IADJ2",
        "type": "input",
        "description": "Analog dimming multiplier input for channel 2; tie to VREF or INTVCC for full-scale current, and keep between 0.5V and 1.5V for linear programming."
      },
      {
        "number": "10",
        "name": "PWM1",
        "type": "input",
        "description": "PWM dimming control for channel 1; 0.5V to 1.5V selects internal exponential duty ratio, external PWM requires ON above 1.6V and OFF below 0.4V."
      },
      {
        "number": "11",
        "name": "PWM2",
        "type": "input",
        "description": "PWM dimming control for channel 2; 0.5V to 1.5V selects internal exponential duty ratio, external PWM requires ON above 1.6V and OFF below 0.4V."
      },
      {
        "number": "12",
        "name": "RT",
        "type": "passive",
        "description": "Connect only a resistor to ground to set the switching frequency and PWM dimming frequency; other connections may stop correct operation."
      },
      {
        "number": "13",
        "name": "FAULT2",
        "type": "output",
        "description": "Open-drain fault indication for channel 2 short LED, open LED, overvoltage and overcurrent faults; pulled low on any reported fault and must not exceed 15V."
      },
      {
        "number": "14",
        "name": "VREF",
        "type": "power_out",
        "description": "2V typical reference supplying up to 2.5mA at room temperature; bypass with 1uF if needed and leave floating if unused."
      },
      {
        "number": "15",
        "name": "EN/UVLO",
        "type": "input",
        "description": "Enable and programmable UVLO input; switching stops below 1.25V typical, logic high above 1.4V and low below 0.3V, absolute maximum 62V."
      },
      {
        "number": "16",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply pin with 5V to 60V operating range and absolute maximum 62V; must be locally bypassed."
      },
      {
        "number": "17",
        "name": "VC2",
        "type": "passive",
        "description": "Internal error amplifier compensation node for channel 2; connect a capacitor or RC network between this pin and ground."
      },
      {
        "number": "18",
        "name": "FB2",
        "type": "input",
        "description": "Channel 2 output voltage feedback from a resistive divider; regulates to about 1.2V typical, overvoltage at 1.26V typical, and shorted LED detected below 300mV typical."
      },
      {
        "number": "19",
        "name": "ISP2",
        "type": "input",
        "description": "Kelvin connect to the high side of the channel 2 LED current sense resistor; if VISP - VISN exceeds about 670mV typical, switching stops and PWMTG2 goes high."
      },
      {
        "number": "20",
        "name": "ISN2",
        "type": "input",
        "description": "Kelvin connect to the low side of the channel 2 LED current sense resistor RILED2; current is 250mV/RILED2 while CTRL2 and IADJ2 are above 1.5V."
      },
      {
        "number": "21",
        "name": "PWMTG2",
        "type": "output",
        "description": "High side gate driver for the external series PMOS switch of channel 2, limited to 8.5V typical below ISP2."
      },
      {
        "number": "22",
        "name": "INTVCC",
        "type": "power_out",
        "description": "Internal supply regulated to 7.5V typical; requires at least 2.2uF to ground with 4.7uF recommended and is not intended to power external loads."
      },
      {
        "number": "23",
        "name": "GATE2",
        "type": "output",
        "description": "External NMOS power switch gate driver for channel 2, connected to the gate of an NMOS whose source is at the switch current sense resistor."
      },
      {
        "number": "24",
        "name": "SENSEP2",
        "type": "input",
        "description": "Kelvin connect to the positive side of the grounded switch current sense resistor for channel 2."
      },
      {
        "number": "25",
        "name": "SENSEN2",
        "type": "input",
        "description": "Kelvin connect to the negative side of the switch current sense resistor for channel 2."
      },
      {
        "number": "26",
        "name": "SENSEN1",
        "type": "input",
        "description": "Kelvin connect to the negative side of the switch current sense resistor for channel 1."
      },
      {
        "number": "27",
        "name": "SENSEP1",
        "type": "input",
        "description": "Kelvin connect to the positive side of the grounded switch current sense resistor for channel 1."
      },
      {
        "number": "28",
        "name": "GATE1",
        "type": "output",
        "description": "External NMOS power switch gate driver for channel 1, connected to the gate of an NMOS whose source is at the switch current sense resistor."
      },
      {
        "number": "29",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed pad ground that must be soldered directly to the ground plane."
      }
    ],
    "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 pin configuration diagram on page 2 is garbled in the extracted text. Pin numbers 1-29 were assi"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0312,
        "at": "2026-10-28T16:07:23"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/lt8355-1.pdf",
        "pages": 31,
        "sha256": "e789002dd440f861",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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}