component
LM5045SQX
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, WQFN-28-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "lm5045sqx",
"title": "LM5045SQX",
"brief": "Texas Instruments AC-DC Controllers And Regulators, WQFN-28-EP(5x5). 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)",
"lm5045sqx",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "LM5045SQX",
"manufacturer": "Texas Instruments",
"package": "WQFN-28-EP(5x5)",
"pin_count": 29,
"category": "Power Management (PMIC)",
"subcategory": "AC-DC Controllers And Regulators",
"datasheet": "https://www.ti.com/cn/lit/gpn/lm5045",
"parts": {
"symbol": "lm5045sqx.kicad_sym",
"footprint": "lm5045sqx.kicad_mod",
"model_3d": "lm5045sqx-hero.glb",
"model_3d_plain": "lm5045sqx-etched.glb",
"model_3d_step": "lm5045sqx-etched.step",
"model_3d_step_plain": "lm5045sqx.step",
"lbr": "lm5045sqx.lbr"
},
"distributor_links": {
"lcsc": "C2859960"
},
"distributor_check": {
"checked_at": "2026-10-21T00:34:48Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "SLOPE",
"type": "output",
"description": "Provides a slope-compensation ramp current source of 0 to 100 µA, and must be tied to AGND when slope compensation is not needed."
},
{
"number": "2",
"name": "COMP",
"type": "input",
"description": "PWM input where the optocoupler current is pulled into an internal NPN mirror; zero current gives maximum duty cycle, 1 mA reduces duty cycle to zero, and COMP input current is limited to 10 mA absolute maximum."
},
{
"number": "3",
"name": "REF",
"type": "power_out",
"description": "Provides a 5 V reference output limited to 15 mA, which must be locally decoupled with a ceramic capacitor."
},
{
"number": "4",
"name": "RT",
"type": "bidirectional",
"description": "A resistor to AGND sets the oscillator frequency (25 kΩ gives 185-215 kHz per phase), and the pin also accepts AC-coupled sync pulses, with the resistor required in both free-running and synchronized operation."
},
{
"number": "5",
"name": "AGND",
"type": "power_in",
"description": "Analog ground that must be connected directly to the power ground terminal and tied to PGND with a short direct connection under the IC."
},
{
"number": "6",
"name": "RD1",
"type": "input",
"description": "A resistor to AGND sets the synchronous rectifier front-edge delay T1 (20 kΩ gives 45-90 ns, 100 kΩ gives 232-388 ns) and limits the maximum duty cycle."
},
{
"number": "7",
"name": "RD2",
"type": "input",
"description": "A resistor to AGND sets the synchronous rectifier rear-edge delay T2 (20 kΩ gives 43-90 ns, 100 kΩ gives 227-384 ns)."
},
{
"number": "8",
"name": "RES",
"type": "input",
"description": "Restart timer pin where 30 µA charges the RES capacitor during current limit, and at 1.0 V the SS capacitor is discharged to disable outputs before the hiccup count of eight ramps between 2 V and 4 V completes."
},
{
"number": "9",
"name": "SS",
"type": "input",
"description": "Soft-start input charged by an internal 20 µA source, where pulling it below 200 mV stops the PWM pulses on HO1/HO2/LO1/LO2 and turns off the synchronous rectifiers."
},
{
"number": "10",
"name": "SSSR",
"type": "input",
"description": "Secondary-side soft-start pin that sets the synchronous rectifier ramp with a 20 µA charge source once SS exceeds 2 V and COMP current is below 800 µA."
},
{
"number": "11",
"name": "SSOFF",
"type": "input",
"description": "Soft-stop disable pin, where connecting it to AGND gives soft stop on VIN UVLO and hiccup faults and connecting it to REF gives hard stop on any fault, with a VIH(min) of 2.8 V and a 200 kΩ pull-down."
},
{
"number": "12",
"name": "HS2",
"type": "input",
"description": "Switching node common to the high-side FET source, low-side FET drain and transformer primary for the second phase, with HS voltage to GND rated from -5 V to 105 V and negative excursions not allowed below VCC - 16 V."
},
{
"number": "13",
"name": "HO2",
"type": "output",
"description": "High-side gate driver output for the bridge upper MOSFET, capable of 1.5 A peak source and 2 A peak sink."
},
{
"number": "14",
"name": "BST2",
"type": "power_in",
"description": "Bootstrap pin that, with an external capacitor to HS2, supplies the HO2 high-side driver from VCC through an external diode, with a recommended value of 0.1 µF or greater."
},
{
"number": "15",
"name": "SR2",
"type": "output",
"description": "Synchronous rectifier gate control output capable of 100 mA peak source and 400 mA peak sink, with a 5 V signal amplitude limit."
},
{
"number": "16",
"name": "LO2",
"type": "output",
"description": "Low-side gate driver output capable of 1.5 A peak source and 2 A peak sink."
},
{
"number": "17",
"name": "VCC",
"type": "power_in",
"description": "Startup regulator output initially regulated to 9.5 V (9.3-9.9 V) and reduced to 7.7 V after SSSR reaches 1 V, with recommended capacitor 0.47-10 µF and an external 10-14 V supply allowed to lower controller dissipation."
},
{
"number": "18",
"name": "PGND",
"type": "power_in",
"description": "Power ground that must be connected directly to AGND under the IC with a short direct connection to avoid ground-bounce jitter."
},
{
"number": "19",
"name": "LO1",
"type": "output",
"description": "Low-side gate driver output capable of 1.5 A peak source and 2 A peak sink."
},
{
"number": "20",
"name": "SR1",
"type": "output",
"description": "Synchronous rectifier gate control output capable of 100 mA peak source and 400 mA peak sink, with a 5 V signal amplitude limit."
},
{
"number": "21",
"name": "BST1",
"type": "power_in",
"description": "Bootstrap pin that, with an external capacitor to HS1, supplies the HO1 high-side driver from VCC through an external diode, with a recommended value of 0.1 µF or greater."
},
{
"number": "22",
"name": "HO1",
"type": "output",
"description": "High-side gate driver output for the bridge upper MOSFET, capable of 1.5 A peak source and 2 A peak sink."
},
{
"number": "23",
"name": "HS1",
"type": "input",
"description": "Switching node common to the high-side FET source, low-side FET drain and transformer primary for the first phase, with HS voltage to GND rated from -5 V to 105 V and negative excursions not allowed below VCC - 16 V."
},
{
"number": "24",
"name": "VIN",
"type": "power_in",
"description": "Input supply for the startup regulator with an operating range of 14 V to 100 V and transients up to 105 V, and it can be bypassed by an external regulator for inputs beyond that range."
},
{
"number": "25",
"name": "UVLO",
"type": "input",
"description": "Line undervoltage input with 0.4 V standby enable and 1.25 V run threshold (1.18-1.32 V) plus 20 µA hysteresis sink, not to exceed 7 V."
},
{
"number": "26",
"name": "OVP",
"type": "input",
"description": "Overvoltage/overtemperature shutdown input with a 1.25 V threshold (1.18-1.32 V), a 20 µA hysteresis current, and a maximum pin voltage of 7 V."
},
{
"number": "27",
"name": "RAMP",
"type": "input",
"description": "PWM comparator ramp input that can carry the primary-current sense signal or a VIN-proportional feedforward ramp, reset to GND at the end of each cycle through a 5.5 Ω MOSFET."
},
{
"number": "28",
"name": "CS",
"type": "input",
"description": "Current-sense input where the PWM pulse terminates when CS exceeds 750 mV (0.71-0.785 V), with a 40 ns internal blanking after switching."
},
{
"number": "29",
"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 package name says WQFN-28-EP, but the provided text never describes or numbers an exposed therma; Pin types were adjusted from the datasheet's printed I/O column to KiCad ERC classes: AGND and PGND ; RT/SYNC is printed as O in the datasheet but functions as a timing resistor and sync input, so it wa",
"exposed pad 29 added from the footprint"
],
"pages_sent": 37,
"cost_usd": 0.1842,
"at": "2026-10-21T00:32:10"
},
"datasheet": {
"url": "https://www.ti.com/cn/lit/gpn/lm5045",
"pages": 47,
"sha256": "47e7c49a68c6bd8e",
"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": "lm5045sqx.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "e9d6d740f505b03e5aa0ac826330f9e269344b84656d051f50eb07ac162749eb",
"checked": "2026-10-21",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "lm5045sqx-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,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "cccb12bc237c4684d129a07e46745493c85dba77e65d1fd397ddbca4c3481271",
"checked": "2026-10-21",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "WQFN-28-EP(5x5)",
"Category": "Power Management (PMIC)",
"Pins": "29"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "47e7c49a68c6bd8eb84ad59219325ca20216427d871ddb637502388860473fec",
"rows": [
{
"name": "VIN to GND",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 105,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "HS to GND",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -5,
"typ": null,
"max": 105,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "BST1/BST2 to GND",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 116,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "BST1/BST2 to HS1/HS2",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 16,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "HO1/HO2 to HS1/HS2",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "LO1/LO2/SR1/SR2 voltage",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VCC to GND",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 16,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "REF, SSOFF, RT, OVP, UVLO to GND",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Ramp (SLOPE pin)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "COMP",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "COMP input current",
"symbol": "",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "All other inputs to GND",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Junction temperature",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Storage temperature",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VIN voltage",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 14,
"typ": null,
"max": 100,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "External voltage applied to VCC",
"symbol": "",
"kind": "recommended_operating",
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"min": 10,
"typ": null,
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"conditions": "",
"source_page": 6,
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},
{
"name": "Junction temperature (operating)",
"symbol": "",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "SLOPE pin voltage",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 2,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VCC1 VCC voltage",
"symbol": "VCC1",
"kind": "electrical",
"unit": "V",
"min": 9.3,
"typ": 9.6,
"max": 9.9,
"conditions": "ICC= 10 mA (SSSR < 1 V)",
"source_page": 7,
"source": "datasheet"
},
{
"name": "VCC2 VCC voltage",
"symbol": "VCC2",
"kind": "electrical",
"unit": "V",
"min": 7.5,
"typ": 7.8,
"max": 8.1,
"conditions": "ICC= 10 mA (SSSR > 1 V)",
"source_page": 7,
"source": "datasheet"
},
{
"name": "VCC current limit",
"symbol": "ICC(Lim)",
"kind": "electrical",
"unit": "mA",
"min": 60,
"typ": null,
"max": 80,
"conditions": "VCC = 6V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "VCC undervoltage threshold, negative-going VCC",
"symbol": "VCC(UV)",
"kind": "electrical",
"unit": "V",
"min": 5.9,
"typ": 6.3,
"max": 6.7,
"conditions": "Negative-going VCC",
"source_page": 7,
"source": "datasheet"
},
{
"name": "VIN shutdown current",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": 300,
"typ": null,
"max": 520,
"conditions": "VIN = 20V, VUVLO = 0V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "VIN shutdown current",
"symbol": "",
"kind": "electrical",
"unit": "µA",
"min": 350,
"typ": null,
"max": 550,
"conditions": "VIN = 100V, VUVLO = 0V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "REF voltage",
"symbol": "VREF",
"kind": "electrical",
"unit": "V",
"min": 4.85,
"typ": 5,
"max": 5.15,
"conditions": "IREF = 0mA",
"source_page": 7,
"source": "datasheet"
},
{
"name": "REF voltage regulation",
"symbol": "",
"kind": "electrical",
"unit": "mV",
"min": 25,
"typ": null,
"max": 50,
"conditions": "IREF = 0 to 10mA",
"source_page": 7,
"source": "datasheet"
},
{
"name": "REF current limit",
"symbol": "IREF(Lim)",
"kind": "electrical",
"unit": "mA",
"min": 15,
"typ": null,
"max": 20,
"conditions": "VREF = 4.5V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "REF undervoltage threshold",
"symbol": "VREFUV",
"kind": "electrical",
"unit": "V",
"min": 4.3,
"typ": 4.5,
"max": 4.7,
"conditions": "Positive-going VREF",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO undervoltage threshold",
"symbol": "VUVLO",
"kind": "electrical",
"unit": "V",
"min": 1.18,
"typ": 1.25,
"max": 1.32,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO hysteresis current",
"symbol": "IUVLO",
"kind": "electrical",
"unit": "µA",
"min": 16,
"typ": 20,
"max": 24,
"conditions": "Sink current at UVLO pin when VUVLO < 1.25V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "UVLO standby enable threshold",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 0.32,
"typ": 0.4,
"max": 0.48,
"conditions": "UVLO voltage rising",
"source_page": 7,
"source": "datasheet"
},
{
"name": "OVP shutdown threshold",
"symbol": "VOVP",
"kind": "electrical",
"unit": "V",
"min": 1.18,
"typ": 1.25,
"max": 1.32,
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