LM5045SQX

{
  "slug": "lm5045sqx",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments AC-DC Controllers And Regulators, WQFN-28-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "lm5045sqx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm5045sqx.kicad_sym",
    "lm5045sqx.kicad_mod",
    "lm5045sqx.glb",
    "lm5045sqx.step",
    "lm5045sqx.lbr",
    "docs/hero.png",
    "docs/lm5045sqx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm5045sqx-hero.glb",
    "lm5045sqx-hero.overlay.json",
    "lm5045sqx-etched.glb"
  ],
  "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": [
      {
        "file": "lm5045sqx.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.92
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "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": [
          5.0,
          5.0,
          0.92
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "cccb12bc237c4684d129a07e46745493c85dba77e65d1fd397ddbca4c3481271",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}