MAX1978ETM+T

{
  "slug": "max1978etm-t",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices Inc Maxim Integrated Battery Management, TQFN-48-EP(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "max1978etm+t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
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    "path": "docs/hero.png"
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  "component": {
    "mpn": "MAX1978ETM+T",
    "manufacturer": "Analog Devices Inc Maxim Integrated",
    "package": "TQFN-48-EP(7x7)",
    "pin_count": 49,
    "category": "Power Management (PMIC)",
    "subcategory": "Battery Management",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893226870300672",
    "parts": {
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      "footprint": "max1978etm-t.kicad_mod",
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      "model_3d_step": "max1978etm-t-etched.step",
      "model_3d_step_plain": "max1978etm-t.step",
      "lbr": "max1978etm-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C962091",
      "digikey": "MAX1978ETM+TTR-ND",
      "mouser": "700-MAX1978ETMT"
    },
    "distributor_check": {
      "checked_at": "2026-10-13T19:43:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "MAX1978ETM+TTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "700-MAX1978ETMT",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "OS2",
        "type": "input",
        "description": "Output Sense 2 senses one side of the differential TEC voltage and is a sense point, not a power output."
      },
      {
        "number": "2",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "3",
        "name": "PGND2",
        "type": "power_in",
        "description": "Power Ground 2 is the internal synchronous rectifier ground connection; connect all PGND pins together at the power ground plane."
      },
      {
        "number": "4",
        "name": "LX2",
        "type": "output",
        "description": "Inductor 2 connection; connect all LX2 pins together and connect LX2 to LX1 when using the MAX1979."
      },
      {
        "number": "5",
        "name": "PGND2",
        "type": "power_in",
        "description": "Power Ground 2 is the internal synchronous rectifier ground connection; connect all PGND pins together at the power ground plane."
      },
      {
        "number": "6",
        "name": "LX2",
        "type": "output",
        "description": "Inductor 2 connection; connect all LX2 pins together and connect LX2 to LX1 when using the MAX1979."
      },
      {
        "number": "7",
        "name": "PVDD2",
        "type": "power_in",
        "description": "Power 2 input must be the same voltage as VDD; bypass to PGND2 with a 10µF ceramic capacitor."
      },
      {
        "number": "8",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "9",
        "name": "LX2",
        "type": "output",
        "description": "Inductor 2 connection; connect all LX2 pins together and connect LX2 to LX1 when using the MAX1979."
      },
      {
        "number": "10",
        "name": "PVDD2",
        "type": "power_in",
        "description": "Power 2 input must be the same voltage as VDD; bypass to PGND2 with a 10µF ceramic capacitor."
      },
      {
        "number": "11",
        "name": "SHDN",
        "type": "input",
        "description": "Active-low shutdown control input."
      },
      {
        "number": "12",
        "name": "OT",
        "type": "output",
        "description": "Over-temperature alarm open-drain output pulls low if temperature feedback rises 20mV (typically +1.5°C) above the set-point voltage."
      },
      {
        "number": "13",
        "name": "UT",
        "type": "output",
        "description": "Under-temperature alarm open-drain output pulls low if temperature feedback falls 20mV (typically +1.5°C) below the set-point voltage."
      },
      {
        "number": "14",
        "name": "INTOUT",
        "type": "output",
        "description": "Integrator amplifier output, normally connected to CTLI."
      },
      {
        "number": "15",
        "name": "INT-",
        "type": "input",
        "description": "Integrator amplifier inverting input, normally connected to DIFOUT through the thermal-compensation network."
      },
      {
        "number": "16",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground; connect all GND pins to the analog ground plane."
      },
      {
        "number": "17",
        "name": "DIFOUT",
        "type": "output",
        "description": "Chopper-stabilized instrumentation amplifier output with differential gain of 50 × (FB+ - FB-)."
      },
      {
        "number": "18",
        "name": "FB-",
        "type": "input",
        "description": "Chopper-stabilized instrumentation amplifier inverting input, connected to the thermistor bridge."
      },
      {
        "number": "19",
        "name": "FB+",
        "type": "input",
        "description": "Chopper-stabilized instrumentation amplifier noninverting input, connected to the thermistor bridge."
      },
      {
        "number": "20",
        "name": "BFB-",
        "type": "output",
        "description": "Chopper-stabilized buffered FB- output used to monitor the thermistor bridge voltage."
      },
      {
        "number": "21",
        "name": "BFB+",
        "type": "output",
        "description": "Chopper-stabilized buffered FB+ output used to monitor the thermistor bridge voltage."
      },
      {
        "number": "22",
        "name": "AIN+",
        "type": "input",
        "description": "Undedicated chopper-stabilized amplifier noninverting input."
      },
      {
        "number": "23",
        "name": "AIN-",
        "type": "input",
        "description": "Undedicated chopper-stabilized amplifier inverting input."
      },
      {
        "number": "24",
        "name": "AOUT",
        "type": "output",
        "description": "Undedicated chopper-stabilized amplifier output."
      },
      {
        "number": "25",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground; connect all GND pins to the analog ground plane."
      },
      {
        "number": "26",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground; connect all GND pins to the analog ground plane."
      },
      {
        "number": "27",
        "name": "PVDD1",
        "type": "power_in",
        "description": "Power 1 input must be the same voltage as VDD; bypass to PGND1 with a 10µF ceramic capacitor."
      },
      {
        "number": "28",
        "name": "LX1",
        "type": "output",
        "description": "Inductor 1 connection; connect all LX1 pins together and connect LX1 to LX2 when using the MAX1979."
      },
      {
        "number": "29",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "30",
        "name": "PVDD1",
        "type": "power_in",
        "description": "Power 1 input must be the same voltage as VDD; bypass to PGND1 with a 10µF ceramic capacitor."
      },
      {
        "number": "31",
        "name": "LX1",
        "type": "output",
        "description": "Inductor 1 connection; connect all LX1 pins together and connect LX1 to LX2 when using the MAX1979."
      },
      {
        "number": "32",
        "name": "PGND1",
        "type": "power_in",
        "description": "Power Ground 1 is the internal synchronous-rectifier ground connection; connect all PGND pins together at the power ground plane."
      },
      {
        "number": "33",
        "name": "LX1",
        "type": "output",
        "description": "Inductor 1 connection; connect all LX1 pins together and connect LX1 to LX2 when using the MAX1979."
      },
      {
        "number": "34",
        "name": "PGND1",
        "type": "power_in",
        "description": "Power Ground 1 is the internal synchronous-rectifier ground connection; connect all PGND pins together at the power ground plane."
      },
      {
        "number": "35",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "36",
        "name": "FREQ",
        "type": "input",
        "description": "Switching-frequency select: low = 500kHz, high = 1MHz."
      },
      {
        "number": "37",
        "name": "ITEC",
        "type": "output",
        "description": "TEC current monitor output; VITEC = 1.50V + (VOS1 - VCS) × 8."
      },
      {
        "number": "38",
        "name": "COMP",
        "type": "passive",
        "description": "Current-control loop compensation; for most designs connect a 10nF capacitor from COMP to GND."
      },
      {
        "number": "39",
        "name": "MAXIP",
        "type": "input",
        "description": "Maximum positive TEC current; connect to REF to set the default positive current limit of +150mV/RSENSE."
      },
      {
        "number": "40",
        "name": "MAXIN",
        "type": "input",
        "description": "Maximum negative TEC current; connect to REF to set the default negative current limit of -150mV/RSENSE, and connect to MAXIP when using the MAX1979."
      },
      {
        "number": "41",
        "name": "MAXV",
        "type": "input",
        "description": "Maximum bipolar TEC voltage; connect an external resistive divider from REF to GND to set it, with maximum TEC voltage equal to 4 × VMAXV."
      },
      {
        "number": "42",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground; connect all GND pins to the analog ground plane."
      },
      {
        "number": "43",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground; connect all GND pins to the analog ground plane."
      },
      {
        "number": "44",
        "name": "VDD",
        "type": "power_in",
        "description": "Analog supply voltage input (3.0V to 5.5V); bypass to GND with a 10µF ceramic capacitor."
      },
      {
        "number": "45",
        "name": "CTLI",
        "type": "input",
        "description": "TEC current-control input that sets differential current into the TEC, with center point at 1.50V (no TEC current); connect to INTOUT when using the thermal control loop."
      },
      {
        "number": "46",
        "name": "REF",
        "type": "power_out",
        "description": "1.5V reference voltage output; bypass REF to GND with a 1µF ceramic capacitor."
      },
      {
        "number": "47",
        "name": "CS",
        "type": "input",
        "description": "Current-sense input; TEC current is monitored between CS and OS1, with maximum TEC current given by 150mV/RSENSE and bipolar for the MAX1978."
      },
      {
        "number": "48",
        "name": "OS1",
        "type": "input",
        "description": "Output Sense 1 senses one side of the differential TEC voltage and is a sense point, not a power output."
      },
      {
        "number": "49",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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 datasheet orders this part as MAX1978ETM+ (48 Thin QFN-EP). The requested MPN MAX1978ETM+T adds ; The TQFN-48-EP (7x7) dimension in the package hint does not appear in the provided datasheet text. T; The exposed pad (EP) is not a numbered pin. The datasheet says it is connected to GND and should be ",
          "exposed pad 49 added from the footprint"
        ],
        "pages_sent": 8,
        "cost_usd": 0.0958,
        "at": "2026-10-13T19:43:19"
      },
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        "pages": 20,
        "sha256": "5d018f9866db0f80",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 49,
        "described": 49,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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}