component
MAX1978ETM+T
Public Made by Adomby adom
Analog Devices Inc Maxim Integrated Battery Management, TQFN-48-EP(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "max1978etm-t",
"title": "MAX1978ETM+T",
"brief": "Analog Devices Inc Maxim Integrated Battery Management, TQFN-48-EP(7x7). 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)",
"max1978etm+t",
"factory-2.0.0",
"extractor-text"
],
"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": {
"symbol": "max1978etm-t.kicad_sym",
"footprint": "max1978etm-t.kicad_mod",
"model_3d": "max1978etm-t-hero.glb",
"model_3d_plain": "max1978etm-t-etched.glb",
"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"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893226870300672",
"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
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
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"file": "max1978etm-t.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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7,
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "f2b38b0b4bf967c77e683e8d4599608b9f0503055ec535b93c4ebb5d0163e916",
"checked": "2026-10-13",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "max1978etm-t-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
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"sha256": "ea44dd1b17ea5f50d2b82969725d04b05caa4ce1039cafbe8832a14ecc3cd6cc",
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]
},
"metadata": {
"specs": {
"Manufacturer": "Analog Devices Inc Maxim Integrated",
"Package": "TQFN-48-EP(7x7)",
"Category": "Power Management (PMIC)",
"Pins": "49"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "5d018f9866db0f801776bcc749925cba36b36fd90e0381b38fed7a9084e393c0",
"rows": [
{
"name": "Input Supply Range",
"symbol": "VDD",
"kind": "electrical",
"unit": "V",
"min": 3,
"typ": null,
"max": 5.5,
"conditions": "TA = -40°C to +85°C",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Output Voltage Range (MAX1978)",
"symbol": "VOUT",
"kind": "electrical",
"unit": "V",
"min": -4.3,
"typ": null,
"max": 4.3,
"conditions": "VDD=5V, ITEC=0 to ±3A, VOUT=VOS1-VOS2",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Output Voltage Range (MAX1978)",
"symbol": "VOUT",
"kind": "electrical",
"unit": "V",
"min": -2.3,
"typ": null,
"max": 2.3,
"conditions": "VDD=3V, ITEC=0 to ±3A, VOUT=VOS1-VOS2",
"source_page": 5,
"source": "datasheet"
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{
"name": "Output Voltage Range (MAX1979)",
"symbol": "VOUT",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 4.3,
"conditions": "VDD=5V, ITEC=0 to 6A, VOUT=VOS1",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Maximum TEC Current (MAX1978)",
"symbol": "ITEC(MAX)",
"kind": "electrical",
"unit": "A",
"min": -3,
"typ": null,
"max": 3,
"conditions": "Printed as ±3",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Maximum TEC Current (MAX1979)",
"symbol": "ITEC(MAX)",
"kind": "electrical",
"unit": "A",
"min": null,
"typ": null,
"max": 6,
"conditions": "Unipolar",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Reference Voltage",
"symbol": "VREF",
"kind": "electrical",
"unit": "V",
"min": 1.475,
"typ": null,
"max": 1.515,
"conditions": "VDD=3V to 5.5V, IREF=150µA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Reference Load Regulation",
"symbol": "ΔVREF",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": null,
"max": 5,
"conditions": "VDD=3V to 5.5V, IREF=10µA to -1mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Current-Sense Threshold",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 135,
"typ": null,
"max": 160,
"conditions": "VOS1 < VCS, VMAXI_ = VREF",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Current-Sense Threshold",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 40,
"typ": null,
"max": 60,
"conditions": "VOS1 < VCS, VMAXI_ = VREF/3",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Current-Sense Threshold",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 135,
"typ": null,
"max": 160,
"conditions": "VOS1 > VCS, VMAXI_ = VREF",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Current-Sense Threshold",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 40,
"typ": null,
"max": 60,
"conditions": "VOS1 > VCS, VMAXI_ = VREF/3",
"source_page": 5,
"source": "datasheet"
},
{
"name": "No-Load Supply Current",
"symbol": "IDD(NOLOAD)",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 50,
"conditions": "VDD=5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "No-Load Supply Current",
"symbol": "IDD(NOLOAD)",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 30,
"conditions": "VDD=3.3V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Shutdown Supply Current",
"symbol": "IDD-SD",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 3,
"conditions": "SHDN=GND, VDD=5V (Note 3)",
"source_page": 5,
"source": "datasheet"
},
{
"name": "UVLO Threshold (rising)",
"symbol": "VUVLO",
"kind": "electrical",
"unit": "V",
"min": 2.4,
"typ": null,
"max": 2.8,
"conditions": "VDD rising",
"source_page": 5,
"source": "datasheet"
},
{
"name": "UVLO Threshold (falling)",
"symbol": "VUVLO",
"kind": "electrical",
"unit": "V",
"min": 2.25,
"typ": null,
"max": 2.75,
"conditions": "VDD falling",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Switching Frequency Internal",
"symbol": "fSW-INT",
"kind": "electrical",
"unit": "kHz",
"min": 450,
"typ": null,
"max": 650,
"conditions": "FREQ = GND",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Switching Frequency Internal",
"symbol": "fSW-INT",
"kind": "electrical",
"unit": "kHz",
"min": 800,
"typ": null,
"max": 1200,
"conditions": "FREQ = VDD",
"source_page": 5,
"source": "datasheet"
},
{
"name": "OS1, OS2, CS Input Current",
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