LM5123QRGRRQ1

{
  "slug": "lm5123qrgrrq1",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments DC-DC Converters, VQFN-20(3.5x3.5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "lm5123qrgrrq1",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm5123qrgrrq1.kicad_sym",
    "lm5123qrgrrq1.kicad_mod",
    "lm5123qrgrrq1.glb",
    "lm5123qrgrrq1.step",
    "lm5123qrgrrq1.lbr",
    "docs/hero.png",
    "docs/lm5123qrgrrq1-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "component": {
    "mpn": "LM5123QRGRRQ1",
    "manufacturer": "Texas Instruments",
    "package": "VQFN-20(3.5x3.5)",
    "pin_count": 21,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm5123-q1",
    "parts": {
      "symbol": "lm5123qrgrrq1.kicad_sym",
      "footprint": "lm5123qrgrrq1.kicad_mod",
      "model_3d": "lm5123qrgrrq1-etched.glb",
      "model_3d_plain": "lm5123qrgrrq1.glb",
      "model_3d_step": "lm5123qrgrrq1-etched.step",
      "model_3d_step_plain": "lm5123qrgrrq1.step",
      "lbr": "lm5123qrgrrq1.lbr"
    },
    "distributor_links": {
      "lcsc": "C3188675",
      "digikey": "296-LM5123QRGRRQ1TR-ND",
      "mouser": "595-LM5123QRGRRQ1"
    },
    "distributor_check": {
      "checked_at": "2026-10-01T18:02:26Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-LM5123QRGRRQ1TR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-LM5123QRGRRQ1",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CSP",
        "type": "input",
        "description": "Current sensing amplifier positive input pin."
      },
      {
        "number": "2",
        "name": "CSN",
        "type": "input",
        "description": "Current sensing amplifier negative input pin."
      },
      {
        "number": "3",
        "name": "VOUT/SENSE",
        "type": "input",
        "description": "Output voltage sensing pin; high-side MOSFET drain voltage sensing pin connected to drain via short low-impedance path."
      },
      {
        "number": "4",
        "name": "PGOOD",
        "type": "output",
        "description": "Power good indicator with open-drain output stage; must be pulled to ground when output voltage is below threshold."
      },
      {
        "number": "5",
        "name": "HO",
        "type": "output",
        "description": "High-side gate driver output connected to high-side N-channel MOSFET gate via short low-impedance path."
      },
      {
        "number": "6",
        "name": "SW",
        "type": "passive",
        "description": "Switch node connection and high-side MOSFET source voltage sensing pin; connected to high-side MOSFET source and low-side MOSFET drain via short low-impedance path."
      },
      {
        "number": "7",
        "name": "HB",
        "type": "passive",
        "description": "High-side driver power supply with internal bootstrap diode connected from VCC; connect 0.1\u03bcF capacitor between this pin and SW."
      },
      {
        "number": "8",
        "name": "BIAS",
        "type": "power_in",
        "description": "Power supply input voltage for VCC regulator; accepts 3.8V to 42V; connect 1\u03bcF capacitor between pin and ground."
      },
      {
        "number": "9",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal VCC regulator output (5V nominal) and power supply for internal MOSFET drivers; connect 4.7\u03bcF capacitor between pin and PGND."
      },
      {
        "number": "10",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin connected directly to low-side N-channel MOSFET source via short low-impedance path."
      },
      {
        "number": "11",
        "name": "LO",
        "type": "output",
        "description": "Low-side gate driver output connected to low-side N-channel MOSFET gate via short low-impedance path."
      },
      {
        "number": "12",
        "name": "MODE",
        "type": "input",
        "description": "Device switching mode selection pin for FPWM, diode emulation, and skip modes; open or >500k\u03a9 to AGND selects skip mode, <0.4V selects DE mode, >2.0V selects FPWM mode."
      },
      {
        "number": "13",
        "name": "UVLO/EN",
        "type": "input",
        "description": "Enable pin and line under-voltage lockout programming pin; device turns off below 0.35V and enables above 0.65V; connect voltage divider to supply voltage and ground."
      },
      {
        "number": "14",
        "name": "SYNC/DITHER/VH/CP",
        "type": "bidirectional",
        "description": "Synchronization clock input, clock dither and spread spectrum modulation programming pin, VCC hold pin for fast restart, and charge pump enable pin for bypass operation."
      },
      {
        "number": "15",
        "name": "RT",
        "type": "input",
        "description": "Switching frequency setting pin; connect single resistor between pin and AGND to program frequency from 100kHz to 2.2MHz without external clock on SYNC pin."
      },
      {
        "number": "16",
        "name": "VREF/RANGE",
        "type": "power_in",
        "description": "1.0V internal reference voltage output and VOUT range selection pin; connect 470pF capacitor to AGND; output voltage range selected by resistor divider during configuration (75-100k\u03a9 for 5-20V, 20-35k\u03a9 for 15-57V)."
      },
      {
        "number": "17",
        "name": "SS",
        "type": "bidirectional",
        "description": "Soft start time programming pin; external capacitor and internal 20\u03bcA current source set soft start ramp rate of error amplifier reference during startup."
      },
      {
        "number": "18",
        "name": "TRK",
        "type": "input",
        "description": "Output regulation target programming pin; VOUT regulated voltage programmed by voltage divider to VREF or direct D/A control; recommended operating voltage 0.25V to 1.0V."
      },
      {
        "number": "19",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground pin connected to analog ground plane via wide short path."
      },
      {
        "number": "20",
        "name": "COMP",
        "type": "output",
        "description": "Transconductive error amplifier output; connect loop compensation network between pin and AGND."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin 6 (SW) is classified as 'passive' rather than bidirectional because it serves as both a switch n; Pin 14 (SYNC/DITHER/VH/CP) has multiple functions mixed (sync input, dither capacitor terminal, VCC ; Exposed pad (EP) is not included in the pin list as it is not a numbered pin but is specified to be "
        ],
        "pages_sent": 46,
        "cost_usd": 0.478,
        "at": "2026-10-01T18:02:04"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm5123-q1",
        "pages": 46,
        "sha256": "a525ddafaa5f90d0",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  }
}