LM5123QRGRRQ1

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm5123qrgrrq1",
  "title": "LM5123QRGRRQ1",
  "brief": "Texas Instruments DC-DC Converters, VQFN-20(3.5x3.5). 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)",
    "lm5123qrgrrq1",
    "factory-2.0.0",
    "extractor-text"
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  "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": "2026-10-01T18:22:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-LM5123QRGRRQ1TR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-LM5123QRGRRQ1",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CSP",
        "type": "input",
        "description": "Current sensing amplifier positive input pin for inductor current feedback with 0.8V to 42V operating range."
      },
      {
        "number": "2",
        "name": "CSN",
        "type": "input",
        "description": "Current sensing amplifier negative input pin with 60mV peak current limiting threshold and 0.8V to 42V maximum rating."
      },
      {
        "number": "3",
        "name": "VOUT/SENSE",
        "type": "input",
        "description": "Output voltage sensing pin for internal feedback divider requiring 0.1µF bypass capacitor with 5V to 57V operating range."
      },
      {
        "number": "4",
        "name": "PGOOD",
        "type": "tri_state",
        "description": "Open-drain power good indicator output pin with 5kΩ to 100kΩ external pull-up resistor transitioning on output voltage under-voltage threshold."
      },
      {
        "number": "5",
        "name": "HO",
        "type": "output",
        "description": "High side gate driver output sourcing 2.2A peak and sinking 3.3A peak current directly to high-side N-channel MOSFET gate."
      },
      {
        "number": "6",
        "name": "SW",
        "type": "passive",
        "description": "Synchronous boost switch node connection between high and low-side MOSFETs providing dynamic switching operation and voltage sensing."
      },
      {
        "number": "7",
        "name": "HB",
        "type": "passive",
        "description": "Bootstrap driver supply pin charged from VCC through internal bootstrap diode requiring 0.1µF capacitor between HB and SW."
      },
      {
        "number": "8",
        "name": "BIAS",
        "type": "power_in",
        "description": "VCC regulator power supply input accepting 3.8V to 42V range with 1µF bypass capacitor supporting 0.8V minimum boost input when BIAS ≥ 3.8V."
      },
      {
        "number": "9",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal regulated 5V power supply output (4.75V to 5.25V) requiring 4.7µF bypass capacitor and 100mA minimum pull current during device configuration."
      },
      {
        "number": "10",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground pin for low-side N-channel MOSFET source requiring short low-impedance path to ground plane."
      },
      {
        "number": "11",
        "name": "LO",
        "type": "output",
        "description": "Low side gate driver output sourcing 2.2A peak and sinking 3.3A peak current with adaptive dead-time control to low-side MOSFET gate."
      },
      {
        "number": "12",
        "name": "MODE",
        "type": "input",
        "description": "Switching mode selection pin configured at startup for skip mode (open or >500kΩ to AGND), diode emulation mode (<0.4V), or FPWM mode (>2.0V/VCC) with dynamic mode switching."
      },
      {
        "number": "13",
        "name": "UVLO/EN",
        "type": "input",
        "description": "Enable pin requiring 0.65V minimum for device enable with 0.55V typical threshold, 90mV hysteresis, and programmable under-voltage lockout via external resistor divider to AGND."
      },
      {
        "number": "14",
        "name": "SYNC/DITHER/VH/CP",
        "type": "bidirectional",
        "description": "Multiplex pin functioning as external synchronous clock input (0.75×fRT to 1.5×fRT), spread spectrum dither capacitor pin (±6% to +5% modulation), VCC hold pin when >2.0V, and charge pump enable pin when >2.0V."
      },
      {
        "number": "15",
        "name": "RT",
        "type": "input",
        "description": "Switching frequency programming pin regulated at 0.5V for 100kHz to 2.2MHz operation via external resistor with dynamic frequency programming during operation."
      },
      {
        "number": "16",
        "name": "VREF/RANGE",
        "type": "power_in",
        "description": "1.0V internal reference voltage output with 330pF to 1nF bypass capacitor requirement and VOUT range selection pin configured at startup with 75kΩ to 100kΩ (5V-20V) or 20kΩ to 35kΩ (15V-57V)."
      },
      {
        "number": "17",
        "name": "SS",
        "type": "bidirectional",
        "description": "Soft start capacitor pin charged by 20µA internal current source providing 120µs ramp with forced diode emulation below 1.5V and SS-FB clamp at 55mV above feedback voltage."
      },
      {
        "number": "18",
        "name": "TRK",
        "type": "input",
        "description": "Output regulation target programming pin accepting 0.25V to 0.95V input voltage for dynamic output voltage control from external DAC or resistor divider to VREF."
      },
      {
        "number": "19",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground pin for low-level signal reference requiring connection to analog ground plane via short wide path."
      },
      {
        "number": "20",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output pin providing compensation network interface with 10MΩ output impedance and 3MHz bandwidth for loop filter design."
      },
      {
        "number": "21",
        "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-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Exposed pad (EP) specifications provided from datasheet but not assigned a pin number in standard nu"
        ],
        "pages_sent": 31,
        "cost_usd": 0.3094,
        "at": "2026-10-01T18:22:05"
      },
      "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"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "VQFN-20(3.5x3.5)",
      "Category": "Power Management (PMIC)",
      "Pins": "21"
    }
  },
  "variants": [],
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  "discovery_triggers": [
    "lm5123qrgrrq1"
  ],
  "discovery_pitch": "LM5123QRGRRQ1 (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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  "visibility": {
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}