LT3796EFE#TRPBF

{
  "slug": "lt3796efe-trpbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices LED Drivers, TSSOP-28-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "led drivers",
    "lt3796efe#trpbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "lt3796efe-trpbf.kicad_sym",
    "lt3796efe-trpbf.kicad_mod",
    "lt3796efe-trpbf.glb",
    "lt3796efe-trpbf.step",
    "lt3796efe-trpbf.lbr",
    "docs/hero.png",
    "docs/lt3796efe-trpbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lt3796efe-trpbf-hero.glb",
    "lt3796efe-trpbf-hero.overlay.json",
    "lt3796efe-trpbf-etched.glb"
  ],
  "component": {
    "mpn": "LT3796EFE#TRPBF",
    "manufacturer": "Analog Devices",
    "package": "TSSOP-28-EP",
    "pin_count": 29,
    "category": "LED Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588908209116991488",
    "parts": {
      "symbol": "lt3796efe-trpbf.kicad_sym",
      "footprint": "lt3796efe-trpbf.kicad_mod",
      "model_3d": "lt3796efe-trpbf-hero.glb",
      "model_3d_plain": "lt3796efe-trpbf-etched.glb",
      "model_3d_step": "lt3796efe-trpbf-etched.step",
      "model_3d_step_plain": "lt3796efe-trpbf.step",
      "lbr": "lt3796efe-trpbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C671576",
      "digikey": "LT3796EFE#TRPBFTR-ND",
      "mouser": "584-LT3796EFE#TRPBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T01:35:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LT3796EFE#TRPBFTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT3796EFE#TRPBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "ISP",
        "type": "input",
        "description": "Positive terminal connection for the LED current-feedback resistor RLED, which also serves as the positive rail for the TG pin driver."
      },
      {
        "number": "2",
        "name": "ISN",
        "type": "input",
        "description": "Negative terminal connection for the LED current-feedback resistor RLED."
      },
      {
        "number": "3",
        "name": "TG",
        "type": "output",
        "description": "Top gate driver output that drives a series PMOS between VISP and (VISP - 7V) when VISP > 7V, with an internal 7V clamp limiting VGS; leave unconnected if not used."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin that also senses the negative terminal of the N-channel MOSFET source current-sense resistor for the control loop."
      },
      {
        "number": "5",
        "name": "ISMON",
        "type": "output",
        "description": "LED current report pin with VISMON = ILED • RLED • 4, driven to ground when PWM is low; leave unconnected if not used."
      },
      {
        "number": "6",
        "name": "FB2",
        "type": "input",
        "description": "Voltage loop feedback 2 regulated to 1.25 V through the DC/DC converter; on the LT3796 it pulls TG high and drives GATE low if driven above 1.3 V, and should be connected to GND if not used."
      },
      {
        "number": "7",
        "name": "FB1",
        "type": "input",
        "description": "Voltage loop feedback 1 for constant-voltage regulation or open-LED detection, regulated to 1.25 V nominal; if driven above 1.3 V it asserts FAULT, pulls GATE low and drives TG high, and must not be left open."
      },
      {
        "number": "8",
        "name": "VC",
        "type": "passive",
        "description": "Transconductance error amplifier output used for loop compensation, high impedance when PWM is low; connect a capacitor to GND (series resistor recommended) and do not leave open."
      },
      {
        "number": "9",
        "name": "CTRL",
        "type": "input",
        "description": "Current-sense threshold adjustment where V(ISP-ISN) = 0.25 • VCTRL plus offset for 0.1 V < VCTRL < 1 V and is held at 250 mV full scale above 1.2 V; connect to VREF for the default 250 mV threshold and pull to GND for zero LED current."
      },
      {
        "number": "10",
        "name": "VREF",
        "type": "power_in",
        "description": "Voltage reference output, typically 2.015 V, that can supply up to 100 µA to a resistor divider on the CTRL pin."
      },
      {
        "number": "11",
        "name": "SS",
        "type": "bidirectional",
        "description": "Soft-start and fault-timer pin with a 28 µA (typical) pull-up to an internal 2.5 V rail, which must be discharged below 0.2 V to reinitiate a soft-start cycle after a fault."
      },
      {
        "number": "12",
        "name": "RT",
        "type": "passive",
        "description": "Switching frequency adjustment pin set by a resistor to GND per the datasheet curve or Table 2, and must not be left open."
      },
      {
        "number": "13",
        "name": "SYNC",
        "type": "input",
        "description": "On the LT3796 it synchronizes the internal oscillator to a 50% duty-cycle logic signal, with RT set for a frequency 20% slower than the SYNC frequency, and it should be tied to GND if not used."
      },
      {
        "number": "14",
        "name": "PWM",
        "type": "input",
        "description": "PWM input where a low signal turns off switching, idles the oscillator and drives TG high, and which should be tied to VREF if not used."
      },
      {
        "number": "15",
        "name": "FAULT",
        "type": "output",
        "description": "Open-collector pull-down that asserts on FB1 overvoltage (VFB1 > 1.3 V), INTVCC undervoltage, LED overcurrent (V(ISP-ISN) > 375 mV) or thermal shutdown, and is latched during PWM low."
      },
      {
        "number": "16",
        "name": "VMODE",
        "type": "output",
        "description": "Open-collector pull-down that asserts when FB1 is above 1.19 V (typical) and V(ISP-ISN) is below 25 mV (typical), and requires an external pull-up resistor to function."
      },
      {
        "number": "17",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin that also serves as a current-sense input for the control loop."
      },
      {
        "number": "18",
        "name": "SENSE",
        "type": "input",
        "description": "Kelvin-connected current-sense input for the positive terminal of the switch current-sense resistor RSENSE in the N-channel MOSFET source, with the negative terminal Kelvin-connected to the IC GND plane."
      },
      {
        "number": "19",
        "name": "GATE",
        "type": "output",
        "description": "N-channel MOSFET gate driver output that switches between INTVCC and GND and is driven to GND during shutdown, fault or idle states."
      },
      {
        "number": "20",
        "name": "INTVCC",
        "type": "power_out",
        "description": "Regulated 7.7 V (typical) supply from VIN for internal loads, the GATE driver and the TG driver, which must be bypassed with a 4.7 µF capacitor placed close to the pin and connected directly to VIN only if VIN is always ≤ 7 V."
      },
      {
        "number": "21",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin that also serves as a current-sense input for the control loop."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin that also serves as a current-sense input for the control loop."
      },
      {
        "number": "23",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply pin that must be locally bypassed with a 0.22 µF (or larger) capacitor placed close to the IC."
      },
      {
        "number": "24",
        "name": "EN/UVLO",
        "type": "input",
        "description": "Enable and undervoltage lockout pin with an accurate 1.22 V falling threshold and a 3 µA pull-down for externally programmed hysteresis; tie to 0.4 V or less to disable the device and reduce VIN quiescent current below 1 µA."
      },
      {
        "number": "25",
        "name": "VS",
        "type": "power_in",
        "description": "Current-sense amplifier power supply pin that supplies the current-sense amplifier and can operate from 3 V to 100 V."
      },
      {
        "number": "26",
        "name": "CSN",
        "type": "input",
        "description": "Negative current-sense input terminal that remains functional for voltages up to 100 V and is typically connected to VS and CSP."
      },
      {
        "number": "27",
        "name": "CSP",
        "type": "input",
        "description": "Positive current-sense input terminal that the internal amplifier sinks current from to regulate it to the CSN potential, with RIN1 from VIN setting ICSOUT = VSNS/RIN1."
      },
      {
        "number": "28",
        "name": "CSOUT",
        "type": "output",
        "description": "Current-sense amplifier output that sources the current drawn from CSP and is typically connected to an external resistor to GND."
      },
      {
        "number": "29",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed pad, internally GND, which 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: Pin 13 is dual-function: SYNC on the LT3796 and TGEN on the LT3796-1. The MPN LT3796EFE#TRPBF is the; The page 2 pin configuration text is flattened, so the pin-number-to-name mapping was inferred from ; Pin types for SS (bidirectional), FAULT and VMODE (open-collector pull-downs) and VC/RT (passive net"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0711,
        "at": "2026-10-21T01:30:42"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588908209116991488",
        "pages": 36,
        "sha256": "f867a3e2b3394db1",
        "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": [
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        "file": "lt3796efe-trpbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          9.7,
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        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ff242f1d3be9d09e7f929707a2c5b1ee974a4f882053b04bcdb1cd2cb21223ef",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lt3796efe-trpbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0b265aacca0bece493b1b443835f6967de07a46fbbe80b20303755d444e6898f",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}