LM5143QRHARQ1

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm5143qrharq1",
  "title": "LM5143QRHARQ1",
  "brief": "Texas Instruments DC-DC Converters, VQFN-40(6x6). 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)",
    "lm5143qrharq1",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "LM5143QRHARQ1",
    "manufacturer": "Texas Instruments",
    "package": "VQFN-40(6x6)",
    "pin_count": 41,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm5143a-q1",
    "parts": {
      "symbol": "lm5143qrharq1.kicad_sym",
      "footprint": "lm5143qrharq1.kicad_mod",
      "model_3d": "lm5143qrharq1-hero.glb",
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      "lbr": "lm5143qrharq1.lbr"
    },
    "distributor_links": {
      "lcsc": "C5219258",
      "digikey": "296-LM5143QRHARQ1TR-ND",
      "mouser": "595-LM5143QRHARQ1"
    },
    "distributor_check": {
      "checked_at": "2026-10-05T21:06:18Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-LM5143QRHARQ1TR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-LM5143QRHARQ1",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SS2",
        "type": "input",
        "description": "Channel 2 soft start programming pin; external capacitor and 20μA current source set soft start ramp duration; pulling below 150mV disables channel 2 gate drivers."
      },
      {
        "number": "2",
        "name": "COMP2",
        "type": "output",
        "description": "Channel 2 transconductance error amplifier output for external loop compensation network."
      },
      {
        "number": "3",
        "name": "FB2",
        "type": "input",
        "description": "Channel 2 feedback input; connect to VDDA for 3.3V fixed output, AGND for 5V fixed output, or external voltage divider for 0.6V to 55V adjustable with 0.6V regulation threshold."
      },
      {
        "number": "4",
        "name": "CS2",
        "type": "input",
        "description": "Channel 2 current sense amplifier input; connect via low-current Kelvin connection to external current sense resistor or DCR sensing network."
      },
      {
        "number": "5",
        "name": "VOUT2",
        "type": "input",
        "description": "Channel 2 output voltage sense and current sense amplifier input; connect to current sense resistor output side or DCR sensing capacitor terminal."
      },
      {
        "number": "6",
        "name": "VCCX",
        "type": "power_in",
        "description": "Optional external bias supply input; when VCCX exceeds 4.3V, internal VCC regulator disables and VCCX connects internally to VCC; do not exceed 6.5V or go below -0.3V."
      },
      {
        "number": "7",
        "name": "PG2",
        "type": "output",
        "description": "Open-drain power-good output that goes low when VOUT2 falls below 92% or rises above 110% of regulation point; 25μs glitch filter prevents false trips."
      },
      {
        "number": "8",
        "name": "HOL2",
        "type": "output",
        "description": "Channel 2 high-side gate driver turn-off output; drives high to disable high-side MOSFET."
      },
      {
        "number": "9",
        "name": "HO2",
        "type": "output",
        "description": "Channel 2 high-side gate driver turn-on output with 3.25A peak pull current and self-adaptive dead-time control; voltage swing HB to SW relative to SW."
      },
      {
        "number": "10",
        "name": "SW2",
        "type": "power_in",
        "description": "Channel 2 buck regulator switch node connecting high-side MOSFET source, low-side MOSFET drain, and bootstrap capacitor; operating range -0.3V to 65V nominal, -5V to 70V absolute maximum."
      },
      {
        "number": "11",
        "name": "HB2",
        "type": "power_in",
        "description": "Channel 2 bootstrap gate driver power supply; operating range -0.3V to 5.25V relative to SW2 node; connect 0.1μF ceramic capacitor between HB2 and SW2."
      },
      {
        "number": "12",
        "name": "LOL2",
        "type": "output",
        "description": "Channel 2 low-side gate driver turn-off output; drives high to disable low-side MOSFET."
      },
      {
        "number": "13",
        "name": "LO2",
        "type": "output",
        "description": "Channel 2 low-side gate driver turn-on output with 4.25A peak sink current and self-adaptive dead-time control relative to PGND2."
      },
      {
        "number": "14",
        "name": "PGND2",
        "type": "power_in",
        "description": "Power ground return for channel 2 low-side NMOS gate driver; must connect to system ground plane and PCB return path."
      },
      {
        "number": "15",
        "name": "VCC",
        "type": "power_in",
        "description": "VCC bias supply pins (pins 15 and 16 must be connected together on PCB); internal 5V regulator with 4.7V to 5.3V output, 3.3V UVLO threshold, and 170mA current limit."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "VCC bias supply pins (pins 15 and 16 must be connected together on PCB); internal 5V regulator with 4.7V to 5.3V output, 3.3V UVLO threshold, and 170mA current limit."
      },
      {
        "number": "17",
        "name": "PGND1",
        "type": "power_in",
        "description": "Power ground return for channel 1 low-side NMOS gate driver; must connect to system ground plane and PCB return path."
      },
      {
        "number": "18",
        "name": "LO1",
        "type": "output",
        "description": "Channel 1 low-side gate driver turn-on output with 4.25A peak sink current and self-adaptive dead-time control relative to PGND1."
      },
      {
        "number": "19",
        "name": "LOL1",
        "type": "output",
        "description": "Channel 1 low-side gate driver turn-off output; drives high to disable low-side MOSFET."
      },
      {
        "number": "20",
        "name": "HB1",
        "type": "power_in",
        "description": "Channel 1 bootstrap gate driver power supply; operating range -0.3V to 5.25V relative to SW1 node; connect 0.1μF ceramic capacitor between HB1 and SW1."
      },
      {
        "number": "21",
        "name": "SW1",
        "type": "power_in",
        "description": "Channel 1 buck regulator switch node connecting high-side MOSFET source, low-side MOSFET drain, and bootstrap capacitor; operating range -0.3V to 65V nominal, -5V to 70V absolute maximum."
      },
      {
        "number": "22",
        "name": "HO1",
        "type": "output",
        "description": "Channel 1 high-side gate driver turn-on output with 3.25A peak pull current and self-adaptive dead-time control; voltage swing HB to SW relative to SW."
      },
      {
        "number": "23",
        "name": "HOL1",
        "type": "output",
        "description": "Channel 1 high-side gate driver turn-off output; drives high to disable high-side MOSFET."
      },
      {
        "number": "24",
        "name": "PG1",
        "type": "output",
        "description": "Open-drain power-good output that goes low when VOUT1 falls below 92% or rises above 110% of regulation point; 25μs glitch filter prevents false trips."
      },
      {
        "number": "25",
        "name": "VIN",
        "type": "power_in",
        "description": "Power supply voltage input source for internal VCC regulator; operating range 3.5V to 65V recommended, -0.3V to 70V absolute maximum; VCC regulator reduces input when VIN < 5V."
      },
      {
        "number": "26",
        "name": "VOUT1",
        "type": "input",
        "description": "Channel 1 output voltage sense and current sense amplifier input; connect to current sense resistor output side or DCR sensing capacitor terminal."
      },
      {
        "number": "27",
        "name": "CS1",
        "type": "input",
        "description": "Channel 1 current sense amplifier input; connect via low-current Kelvin connection to external current sense resistor or DCR sensing network."
      },
      {
        "number": "28",
        "name": "FB1",
        "type": "input",
        "description": "Channel 1 feedback input; connect to VDDA for 3.3V fixed output, AGND for 5V fixed output, or external voltage divider for 0.6V to 55V adjustable with 0.6V regulation threshold."
      },
      {
        "number": "29",
        "name": "COMP1",
        "type": "output",
        "description": "Channel 1 transconductance error amplifier output for external loop compensation; gm = 1200μS in normal mode or gm = 60μS in ultra-low IQ mode."
      },
      {
        "number": "30",
        "name": "SS1",
        "type": "input",
        "description": "Channel 1 soft start programming pin; external capacitor and 20μA current source set soft start ramp duration; pulling below 150mV disables channel 1 gate drivers."
      },
      {
        "number": "31",
        "name": "EN1",
        "type": "input",
        "description": "Active-high enable input for channel 1; threshold >2V enables output, <0.4V disables output; can accept input voltage up to 70V; do not leave floating."
      },
      {
        "number": "32",
        "name": "RES",
        "type": "output",
        "description": "Restart timer pin for hiccup mode configuration; external capacitor sets hiccup protection delay time using 20μA charging current; pulled low when 512 consecutive cycle limit events detected."
      },
      {
        "number": "33",
        "name": "DEMB",
        "type": "input",
        "description": "Diode emulation/synchronization input pin; connect to AGND for DCM diode emulation mode, VDDA for FPWM mode, or apply external clock (up to 2.5MHz) for frequency synchronization."
      },
      {
        "number": "34",
        "name": "MODE",
        "type": "input",
        "description": "Mode selection pin; connect to AGND for dual output 1200μS transconductance operation, or 10kΩ resistor to AGND for ultra-low IQ 60μS operation."
      },
      {
        "number": "35",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground connection for internal voltage reference and analog circuits; must establish single-point connection to system ground at exposed pad location."
      },
      {
        "number": "36",
        "name": "VDDA",
        "type": "power_out",
        "description": "Internal analog bias regulator output providing 4.75V to 5.25V; connect 470nF ceramic decoupling capacitor between VDDA and AGND for low-noise bias rail."
      },
      {
        "number": "37",
        "name": "RT",
        "type": "input",
        "description": "Frequency programming pin; external resistor to AGND sets oscillator frequency using equation fSW(MHz) = 22/RRT(kΩ) for range 100kHz to 2.2MHz."
      },
      {
        "number": "38",
        "name": "DITH",
        "type": "input",
        "description": "Dither control pin; external capacitor with 20μA charging current enables frequency dither modulation at ±5% around programmed frequency; connect to VDDA during power-up to disable dither."
      },
      {
        "number": "39",
        "name": "SYNCOUT",
        "type": "output",
        "description": "Synchronization output providing 90° phase-lagging logic-level signal relative to HO2; use for cascading multiple LM5143A-Q1 controllers or external phase distribution."
      },
      {
        "number": "40",
        "name": "EN2",
        "type": "input",
        "description": "Active-high enable input for channel 2; threshold >2V enables output, <0.4V disables output; can accept input voltage up to 70V; do not leave floating."
      },
      {
        "number": "41",
        "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: SW1 and SW2 are high-voltage switch nodes that conduct power and can swing significantly in voltage ; VCC pins 15 and 16 must be connected together on the PCB per datasheet requirement. Separation could; VOUT1 and VOUT2 are feedback sense inputs (not the actual regulator outputs); they monitor external ",
          "exposed pad 41 added from the footprint"
        ],
        "pages_sent": 33,
        "cost_usd": 0.3211,
        "at": "2026-10-05T21:06:00"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm5143a-q1",
        "pages": 73,
        "sha256": "2815ac02b2daae78",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 41,
        "described": 41,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "VQFN-40(6x6)",
      "Category": "Power Management (PMIC)",
      "Pins": "41"
    }
  },
  "variants": [],
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  "discovery_triggers": [
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  "discovery_pitch": "LM5143QRHARQ1 (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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