LTC7878AUH#TRPBF

{
  "slug": "ltc7878auh-trpbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices DC-DC Converters, QFN-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
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    "power management (pmic)",
    "ltc7878auh#trpbf",
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  "component": {
    "mpn": "LTC7878AUH#TRPBF",
    "manufacturer": "Analog Devices",
    "package": "QFN-32(5x5)",
    "pin_count": 33,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590905489247055872",
    "parts": {
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      "lbr": "ltc7878auh-trpbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C5665467",
      "digikey": "505-LTC7878AUH#TRPBFTR-ND",
      "mouser": "584-LTC7878AUH#TRPBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T01:25:58Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-LTC7878AUH#TRPBFTR-ND",
        "status": "found"
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    },
    "pins": [
      {
        "number": "1",
        "name": "BG1",
        "type": "output",
        "description": "Bottom gate driver output that drives the bottom N-channel MOSFET gate between PGND and DRVCC."
      },
      {
        "number": "2",
        "name": "VIN",
        "type": "power_in",
        "description": "Main IC supply input to the internal LDO, to be bypassed to PGND with 0.1µF to 1µF placed close to the pin."
      },
      {
        "number": "3",
        "name": "DRVCC",
        "type": "power_out",
        "description": "Gate driver LDO output regulated to 7V from VIN or EXTVCC, to be bypassed to PGND with a minimum of 4.7µF low-ESR tantalum or ceramic capacitor."
      },
      {
        "number": "4",
        "name": "EXTVCC",
        "type": "power_in",
        "description": "External power input to an internal LDO connected to DRVCC; when its voltage is greater than 8V and lower than the VIN voltage, it bypasses the VIN-powered LDO, and it is bypassed to PGND with 0.1µF to 1µF."
      },
      {
        "number": "5",
        "name": "INTVCC",
        "type": "power_out",
        "description": "Internal 5V regulator output that powers the control circuits, to be bypassed to SGND with a minimum of 4.7µF low-ESR capacitor."
      },
      {
        "number": "6",
        "name": "RUN",
        "type": "input",
        "description": "Enable control input where a voltage above 1.22V turns on the IC, with a 2µA pull-up that increases to 6µA once RUN rises above the threshold."
      },
      {
        "number": "7",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground that must be connected closely to the bottom MOSFET sources and the negative terminals of the VIN, DRVCC and EXTVCC bypass capacitors."
      },
      {
        "number": "8",
        "name": "BG2",
        "type": "output",
        "description": "Bottom gate driver output that drives the bottom N-channel MOSFET gate between PGND and DRVCC."
      },
      {
        "number": "9",
        "name": "TG2",
        "type": "output",
        "description": "Top gate driver output of a floating driver with a voltage swing equal to DRVCC superimposed on the SW2 switching node voltage."
      },
      {
        "number": "10",
        "name": "BOOST2",
        "type": "power_out",
        "description": "Bootstrapped supply for the top-side floating driver 2, swinging from DRVCC to (VOUT + DRVCC), with a bootstrap capacitor to SW2 and a Schottky diode to DRVCC."
      },
      {
        "number": "11",
        "name": "SW2",
        "type": "passive",
        "description": "Switch node connection normally tied to the inductor, swinging from a Schottky diode drop below ground up to VOUT, with a 0.1µF to 1µF bootstrap capacitor to BOOST2."
      },
      {
        "number": "12",
        "name": "PGOOD",
        "type": "output",
        "description": "Open-drain power good output pulled to ground when the regulated output exceeds the ±10% window after the internal 30µs power bad mask timer expires."
      },
      {
        "number": "13",
        "name": "SS",
        "type": "passive",
        "description": "Soft-start pin with a 2.5µA pull-up whose capacitor to ground sets the output voltage ramp rate."
      },
      {
        "number": "14",
        "name": "ITHB",
        "type": "passive",
        "description": "Fast transient current control threshold pin that may be configured with a resistor to ITH, and must not be left floating (short to ITH if unused)."
      },
      {
        "number": "15",
        "name": "ITH",
        "type": "passive",
        "description": "Current control threshold and error amplifier compensation point, with the compensation network connected from ITH to SGND."
      },
      {
        "number": "16",
        "name": "VFB",
        "type": "input",
        "description": "Output voltage sense input to the error amplifier noninverting input, receiving the remotely sensed feedback from an external resistor divider across the output."
      },
      {
        "number": "17",
        "name": "MODE/ILIM",
        "type": "input",
        "description": "Tying to GND or INTVCC enables forced continuous mode, otherwise pulse-skipping mode is used, and a voltage below INTVCC/2 selects the low current limit while above INTVCC/2 selects the high current limit."
      },
      {
        "number": "18",
        "name": "PHASMD",
        "type": "input",
        "description": "Phase mode program pin that sets the CLKOUT phase shift: tie to SGND for 180°, float for 120°, or tie to INTVCC for 90°."
      },
      {
        "number": "19",
        "name": "FREQ",
        "type": "passive",
        "description": "Frequency set pin where a resistor to SGND sets the switching frequency, with the pin sourcing 10µA."
      },
      {
        "number": "20",
        "name": "CLKOUT",
        "type": "output",
        "description": "Clock output used to synchronize the switching frequency of multiple LTC7878 ICs in parallel operation, swinging from INTVCC to ground."
      },
      {
        "number": "21",
        "name": "SYNC",
        "type": "input",
        "description": "Switching frequency synchronization input that locks to an external clock between 100kHz and 600kHz, and uses the FREQ resistor setting when low, with a 500k internal resistor to ground."
      },
      {
        "number": "22",
        "name": "SETCUR",
        "type": "passive",
        "description": "Average current regulation pin where a resistor to SGND sets the maximum average input or output current, with the pin sourcing 15µA."
      },
      {
        "number": "23",
        "name": "CSP",
        "type": "input",
        "description": "Positive input of the internal rail-to-rail average current sense amplifier."
      },
      {
        "number": "24",
        "name": "CSN",
        "type": "input",
        "description": "Negative input of the internal rail-to-rail average current sense amplifier."
      },
      {
        "number": "25",
        "name": "VOUT",
        "type": "power_in",
        "description": "Floating driver bias pin in boost mode that supplies bias current for the BOOST1 to SW1 driver circuitry when VOUT is much higher than VIN."
      },
      {
        "number": "26",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect pin."
      },
      {
        "number": "27",
        "name": "ISNSN",
        "type": "input",
        "description": "Negative input of the current sense comparator, normally connected to the DCR sensing network."
      },
      {
        "number": "28",
        "name": "ISNSP",
        "type": "input",
        "description": "Positive input of the current sense comparator that must be Kelvin connected to the inductor on switching node SW1."
      },
      {
        "number": "29",
        "name": "ISNSD",
        "type": "input",
        "description": "DC current sense comparator input that amplifies the DC portion of the sensed current, and is shorted locally to ISNSP if unused in large DCR applications."
      },
      {
        "number": "30",
        "name": "SW1",
        "type": "passive",
        "description": "Switch node connection normally tied to the inductor, swinging from a Schottky diode drop below ground up to VIN, with a 0.1µF to 1µF bootstrap capacitor to BOOST1."
      },
      {
        "number": "31",
        "name": "BOOST1",
        "type": "power_out",
        "description": "Bootstrapped supply for the top-side floating driver 1, swinging from DRVCC to (VIN + DRVCC), with a bootstrap capacitor to SW1 and a Schottky diode to DRVCC."
      },
      {
        "number": "32",
        "name": "TG1",
        "type": "output",
        "description": "Top gate driver output of a floating driver with a voltage swing equal to DRVCC superimposed on the SW1 switching node voltage."
      },
      {
        "number": "33",
        "name": "SGND",
        "type": "power_in",
        "description": "Signal ground exposed pad that must be soldered to PCB ground for rated thermal performance, and to which all small-signal components (INTVCC, SS, ITH, VFB, FREQ, etc.) connect."
      }
    ],
    "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 TOP VIEW pin map on page 2 is garbled in the extracted text, so pin numbers were taken from the ; Pin 26 (NC) is a no-connect pin and is typed as unconnected.; Pin 33 is the exposed pad, listed as SGND. The datasheet says it must be soldered to PCB ground; it "
        ],
        "pages_sent": 9,
        "cost_usd": 0.0936,
        "at": "2026-10-18T01:24:30"
      },
      "datasheet": {
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        "pages": 29,
        "sha256": "570c451c2e04a375",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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}