component
LM27403SQ
Public Made by Adomby adom
Texas Instruments DC-DC Controllers, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "lm27403sq",
"title": "LM27403SQ",
"brief": "Texas Instruments DC-DC Controllers, QFN-24-EP(4x4). 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 ics",
"lm27403sq",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "LM27403SQ",
"manufacturer": "Texas Instruments",
"package": "QFN-24-EP(4x4)",
"pin_count": 25,
"category": "Power Management ICs",
"subcategory": "DC-DC Controllers",
"datasheet": "https://www.ti.com/lit/ds/symlink/lm27403sq.pdf",
"parts": {
"symbol": "lm27403sq.kicad_sym",
"footprint": "lm27403sq.kicad_mod",
"model_3d": "lm27403sq-hero.glb",
"model_3d_plain": "lm27403sq-etched.glb",
"model_3d_step": "lm27403sq-etched.step",
"model_3d_step_plain": "lm27403sq.step",
"lbr": "lm27403sq.lbr"
},
"distributor_links": {
"lcsc": "C2650249"
},
"distributor_check": {
"checked_at": "2026-10-30T16:11:51Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "SS/TRACK",
"type": "bidirectional",
"description": "Soft-start or tracking input: a capacitor to GND sets the startup rate, a 3-µA source charges it until the reference reaches 0.6 V, and it can be driven externally from 0 V to VDD for tracking."
},
{
"number": "2",
"name": "RS",
"type": "input",
"description": "Negative remote sense input that removes the ground drop between GND and the local load ground, with RS limited to -0.1 V to 0.1 V and tied to GND at the IC if unused."
},
{
"number": "3",
"name": "FB",
"type": "input",
"description": "Voltage-mode error amplifier inverting input that sets the output voltage, held at 0.6 V ±1% in closed-loop regulation."
},
{
"number": "4",
"name": "COMP",
"type": "output",
"description": "Error amplifier output that is connected to FB through a compensation network to ensure loop stability."
},
{
"number": "5",
"name": "FADJ",
"type": "input",
"description": "Frequency adjust input whose connected resistor to GND sets the switching frequency, programmable from 200 kHz to 1.2 MHz."
},
{
"number": "6",
"name": "SYNC",
"type": "input",
"description": "Synchronization input for PLL locking to an external clock, limited to 0 V to 5.5 V, defaulting to the FADJ frequency when no clock is present and to be tied to GND if unused."
},
{
"number": "7",
"name": "UVLO/EN",
"type": "input",
"description": "Precision UVLO/enable input with a 1.15-V rising enable threshold, 0.985-V falling threshold, 165-mV voltage hysteresis, and a pin range of 0 V to min(VIN, 5.5 V)."
},
{
"number": "8",
"name": "OTP",
"type": "input",
"description": "Overtemperature protection setpoint pin where a resistor and 0.1-µF capacitor to GND set the OTP threshold from the remote thermal diode, and it is connected to GND if system OTP is not required."
},
{
"number": "9",
"name": "D+",
"type": "input",
"description": "External temperature sense input for a 2N3904-type NPN remote thermal diode (base and collector shorted) used to compensate inductor DCR drift and provide system thermal shutdown."
},
{
"number": "10",
"name": "D-",
"type": "input",
"description": "Return path for the external NPN thermal diode, to be routed as a differential pair with D+ and connected to GND."
},
{
"number": "11",
"name": "PGOOD",
"type": "output",
"description": "Open-drain power-good output that goes low during fault or unregulated conditions, requires an external pullup, includes a 20-µs deglitch filter, and must not exceed 5.5 V."
},
{
"number": "12",
"name": "VIN",
"type": "power_in",
"description": "Input voltage rail operating from 3.0 V to 20 V that provides feedforward and internal bias generation, to be decoupled locally with a 1-µF ceramic capacitor."
},
{
"number": "13",
"name": "GND",
"type": "power_in",
"description": "Common ground for power and signal return, including low-side gate return, soft-start capacitor, OTP resistor, and frequency adjust resistor."
},
{
"number": "14",
"name": "VDD",
"type": "power_out",
"description": "Subregulated 4.7-V bias supply rail (VDD range 2.6 V to 5.5 V) for internal and gate drive circuits, to be decoupled with a 10-µF ceramic capacitor and not used to drive auxiliary loads."
},
{
"number": "15",
"name": "LG",
"type": "output",
"description": "Low-side MOSFET gate drive output that connects to the low-side N-FET gate."
},
{
"number": "16",
"name": "SW",
"type": "power_out",
"description": "Power stage switch-node connection that also serves as the high-side N-FET gate driver return, tolerating negative spikes to -10 V and positive spikes to 30 V for up to 10 ns."
},
{
"number": "17",
"name": "HG",
"type": "output",
"description": "High-side MOSFET gate drive output that connects to the high-side N-FET gate."
},
{
"number": "18",
"name": "CBOOT",
"type": "power_in",
"description": "High-side bootstrap connection supplying the high-side N-FET gate driver, with a 100-nF ceramic capacitor between CBOOT and SW and spikes up to 35 V tolerated for 10 ns."
},
{
"number": "19",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet says to connect this pin directly to GND."
},
{
"number": "20",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet says to connect this pin directly to GND."
},
{
"number": "21",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet says to connect this pin directly to GND."
},
{
"number": "22",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet says to connect this pin directly to GND."
},
{
"number": "23",
"name": "CS+",
"type": "input",
"description": "Noninverting input to the current-sense comparator for DCR-based overcurrent sensing, with CS+ to CS- limited to ±1 V."
},
{
"number": "24",
"name": "CS-",
"type": "input",
"description": "Inverting input to the current-sense comparator, with 9.9 µA of nominal offset current at room temperature used to adjust the current-limit setpoint."
},
{
"number": "25",
"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 lists these as NC and says to connect them directly to GND. I used KiCad 'unconnected'; The exposed pad is labelled 'EP' in the datasheet, not given a numeric pin. Its type is set to power; The datasheet marks SW and VDD as type P without a direction. I assigned power_out, since SW is the ",
"exposed pad 25 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint",
"1/25 pins cited to the wrong page (name found elsewhere): ['21:NC@p4']"
],
"pages_sent": 8,
"cost_usd": 0.0675,
"at": "2026-10-30T16:11:33"
},
"datasheet": {
"url": "https://www.ti.com/lit/ds/symlink/lm27403sq.pdf",
"pages": 56,
"sha256": "b9d9b331b0096516",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 25,
"described": 25,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "lm27403sq.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
4,
4,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "096fc110543e6d324c5120c2d38e3dca87a389da9b6fac234f1fe40856295ef4",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "lm27403sq-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
4,
4,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "fbc345db935ccb62078e9b3f5115ff476d5084c13d0fed395ec8f1cd972a587f",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
],
"package_dims": {
"package_code": "RTW0024A (WQFN-24)",
"source_page": 53,
"D": {
"nom_mm": 4,
"range_mm": [
3.9,
4.1
]
},
"E1": {
"nom_mm": 4,
"range_mm": [
3.9,
4.1
]
},
"e": {
"nom_mm": 0.5,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 0.8,
"range_mm": [
null,
0.8
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "lm27403sq.step",
"verdict": "PASS",
"reasons": [
"height within the datasheet's package drawing"
],
"by": "factory/package_fit.py"
}
}
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "QFN-24-EP(4x4)",
"Category": "Power Management ICs",
"Pins": "25"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "b9d9b331b0096516a5ed9efbdd55cb48dc1af50e9400e71d3ed73d0962f28783",
"rows": [
{
"name": "FB pin voltage accuracy",
"symbol": "VFB",
"kind": "tolerance",
"unit": "mV",
"min": 594,
"typ": 600,
"max": 606,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FB pin bias current",
"symbol": "IFB",
"kind": "electrical",
"unit": "nA",
"min": -165,
"typ": 0,
"max": 165,
"conditions": "VFB = 0.65 V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input undervoltage lockout",
"symbol": "UVLO",
"kind": "electrical",
"unit": "V",
"min": 2.6,
"typ": 2.7,
"max": 2.8,
"conditions": "VVIN rising, VVDD rising",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switching frequency",
"symbol": "FSW",
"kind": "electrical",
"unit": "kHz",
"min": 925,
"typ": 1050,
"max": 1150,
"conditions": "RFADJ = 4.12 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switching frequency",
"symbol": "FSW",
"kind": "electrical",
"unit": "kHz",
"min": 435,
"typ": 500,
"max": 555,
"conditions": "RFADJ = 20 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switching frequency",
"symbol": "FSW",
"kind": "electrical",
"unit": "kHz",
"min": 185,
"typ": 215,
"max": 250,
"conditions": "RFADJ = 95.3 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Minimum off-time",
"symbol": "TOFF-MIN",
"kind": "electrical",
"unit": "ns",
"min": 110,
"typ": 150,
"max": 190,
"conditions": "VFB = 0.5 V, FSW = 500 kHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VDD subregulator output voltage",
"symbol": "VDD",
"kind": "electrical",
"unit": "V",
"min": 4.2,
"typ": 4.7,
"max": 5.3,
"conditions": "IVDD = 25 mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Current limit comparator offset voltage",
"symbol": "VCS_OFFSET",
"kind": "electrical",
"unit": "mV",
"min": -3.5,
"typ": 0,
"max": 3.5,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Current limit offset current",
"symbol": "ICS",
"kind": "electrical",
"unit": "µA",
"min": 9.3,
"typ": 9.9,
"max": 10.5,
"conditions": "VCS– = 3 V, ΔVBE = 59.4 mV, TJ = 25°C",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Current limit offset current (D+ shorted to D–)",
"symbol": "ICS",
"kind": "electrical",
"unit": "µA",
"min": 3.4,
"typ": 5,
"max": 6.6,
"conditions": "VCS– = 3 V, D+ shorted to D–",
"source_page": 7,
"source": "datasheet"
},
{
"name": "ICS temperature coefficient",
"symbol": "ICS-TC",
"kind": "temperature_coefficient",
"unit": "nA/mV",
"min": 160,
"typ": 187,
"max": 212,
"conditions": "Referenced to ΔVBE",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Soft-start source current",
"symbol": "ISS",
"kind": "electrical",
"unit": "µA",
"min": 1,
"typ": 3,
"max": 5,
"conditions": "VSS/TRACK = 0 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Overvoltage threshold",
"symbol": "OVT",
"kind": "electrical",
"unit": "%",
"min": 111,
"typ": 116.5,
"max": 123,
"conditions": "VFB rising, RS tied to GND",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Undervoltage threshold",
"symbol": "UVT",
"kind": "electrical",
"unit": "%",
"min": 86,
"typ": 91,
"max": 97,
"conditions": "VFB rising, RS tied to GND",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO/EN logic low threshold",
"symbol": "VUVLO1",
"kind": "electrical",
"unit": "V",
"min": 0.94,
"typ": 0.985,
"max": 1.03,
"conditions": "VUVLO/EN falling",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO/EN logic high threshold",
"symbol": "VUVLO2",
"kind": "electrical",
"unit": "V",
"min": 1.11,
"typ": 1.15,
"max": 1.18,
"conditions": "VUVLO/EN rising",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO/EN voltage hysteresis",
"symbol": "VUVLO-HYS",
"kind": "electrical",
"unit": "mV",
"min": 139,
"typ": 165,
"max": 190,
"conditions": "VUVLO/EN falling",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO/EN pullup current, disabled",
"symbol": "IUVLO1",
"kind": "electrical",
"unit": "µA",
"min": 0.8,
"typ": 1.8,
"max": 2.7,
"conditions": "VUVLO/EN = 0 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO/EN pullup current, enabled",
"symbol": "IUVLO2",
"kind": "electrical",
"unit": "µA",
"min": 5.5,
"typ": 10.5,
"max": 15.5,
"conditions": "VUVLO/EN = 1.25 V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Remote thermal current",
"symbol": "IOTP",
"kind": "electrical",
"unit": "µA",
"min": 13.5,
"typ": 14.6,
"max": 15.5,
"conditions": "ΔVBE = 79.3 mV",
"source_page": 8,
"source": "datasheet"
},
{
"name": "IOTP temperature coefficient",
"symbol": "IOTP-TC",
"kind": "temperature_coefficient",
"unit": "nA/mV",
"min": 158,
"typ": 187,
"max": 213,
"conditions": "Referenced to ΔVBE",
"source_page": 8,
"source": "datasheet"
},
{
"name": "OTP resistance, thermal shutdown",
"symbol": "ROTP",
"kind": "tolerance",
"unit": "%",
"min": -5,
"typ": null,
"max": 5,
"conditions": "ROTP(nom) = 80.7 kΩ, ΔVBE = 79.3 mV, TJ = 125°C",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Voltage on VIN, CS+, CS–, SW",
"symbol": "VIN, CS+, CS–, SW",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 22,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage on VDD, PGOOD",
"symbol": "VDD, PGOOD",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage on SS/TRACK, SYNC, FADJ, COMP, FB, RS",
"symbol": "SS/TRACK, SYNC, FADJ, COMP, FB, RS",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage on UVLO/EN",
"symbol": "UVLO/EN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage on CBOOT",
"symbol": "CBOOT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 24,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage CBOOT to SW",
"symbol": "CBOOT to SW",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage CS+ to CS–",
"symbol": "CS+ to CS–",
"kind": "absolute_maximum",
"unit": "V",
"min": -1,
"typ": null,
"max": 1,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage on OTP, D+, D–",
"symbol": "OTP, D+, D–",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Operating junction temperature",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Input voltage (VIN tied to VDD)",
"symbol": "VIN",
"kind": "recommended_operating",
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