LM5122QMH

{
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  "type": "component",
  "slug": "lm5122qmh",
  "title": "LM5122QMH",
  "brief": "Texas Instruments DC-DC Controllers, HTSSOP-20. 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 supply chip",
    "lm5122qmh",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "LM5122QMH",
    "manufacturer": "Texas Instruments",
    "package": "HTSSOP-20",
    "pin_count": 21,
    "category": "Power Supply Chip",
    "subcategory": "DC-DC Controllers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm5122-q1",
    "parts": {
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      "footprint": "lm5122qmh.kicad_mod",
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      "model_3d_plain": "lm5122qmh.glb",
      "model_3d_step": "lm5122qmh-etched.step",
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      "lbr": "lm5122qmh.lbr"
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    "distributor_links": {
      "lcsc": "C1529958"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T21:08:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SYNCOUT",
        "type": "output",
        "description": "Clock output providing a 180° shifted clock for interleaved operation, and it can be left floating when not used."
      },
      {
        "number": "2",
        "name": "OPT",
        "type": "input",
        "description": "Clock synchronization selection pin that also enables or disables SYNCOUT for master/slave configuration, and it should not be left floating."
      },
      {
        "number": "3",
        "name": "CSN",
        "type": "input",
        "description": "Inverting input of the current sense amplifier, connected to the negative side of the current sense resistor."
      },
      {
        "number": "4",
        "name": "CSP",
        "type": "input",
        "description": "Non-inverting input of the current sense amplifier, connected to the positive side of the current sense resistor."
      },
      {
        "number": "5",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply voltage input for the VCC regulator, connected to the input capacitor with short, low-impedance paths."
      },
      {
        "number": "6",
        "name": "UVLO",
        "type": "input",
        "description": "Undervoltage lockout programming pin: below 0.4 V the regulator shuts down, 0.4 V to 1.2 V gives standby, and above 1.2 V starts the start-up sequence; it should not be left floating."
      },
      {
        "number": "7",
        "name": "SS",
        "type": "input",
        "description": "Soft-start programming pin, where an external capacitor and an internal 10 µA current source set the ramp rate of the error amplifier reference."
      },
      {
        "number": "8",
        "name": "SYNCIN/RT",
        "type": "input",
        "description": "Oscillator frequency programming pin set by a single resistor to AGND, which also accepts a positive pulse for external synchronization; the recommended maximum master oscillator frequency is 2 MHz, giving 1 MHz maximum switching frequency."
      },
      {
        "number": "9",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground connection and return for the internal voltage reference and analog circuits."
      },
      {
        "number": "10",
        "name": "FB",
        "type": "input",
        "description": "Inverting input of the internal error amplifier with a 1.2 V regulation threshold, and the controller is configured as slave mode if FB is above 2.7 V at initial power-on."
      },
      {
        "number": "11",
        "name": "COMP",
        "type": "output",
        "description": "Output of the internal error amplifier, with the loop compensation network connected between this pin and FB."
      },
      {
        "number": "12",
        "name": "SLOPE",
        "type": "input",
        "description": "Slope compensation programmed by a single resistor between SLOPE and AGND."
      },
      {
        "number": "13",
        "name": "MODE",
        "type": "input",
        "description": "Switching mode selection pin, where a voltage above the 1.2 V threshold forces PWM mode and below 1.2 V selects diode emulation mode, with a 700 kΩ pullup and 100 kΩ pulldown holding it at 0.15 V by default."
      },
      {
        "number": "14",
        "name": "RES",
        "type": "output",
        "description": "Restart timer pin for an external capacitor that sets hiccup-mode off-time and restart delay during overload, and it should connect directly to AGND when hiccup mode is not required."
      },
      {
        "number": "15",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground connection for the low-side N-channel MOSFET gate driver, connected directly to the source of the low-side MOSFET."
      },
      {
        "number": "16",
        "name": "LO",
        "type": "output",
        "description": "Low-side N-channel MOSFET gate drive output, connected to the low-side MOSFET gate through a short, low-inductance path."
      },
      {
        "number": "17",
        "name": "VCC",
        "type": "power_out",
        "description": "VCC bias supply pin that must be locally decoupled to PGND with a low ESR/ESL capacitor placed as close as possible to the controller."
      },
      {
        "number": "18",
        "name": "SW",
        "type": "bidirectional",
        "description": "Switching node of the boost regulator, connected to the bootstrap capacitor, the high-side MOSFET source, and the low-side MOSFET drain through short, low-inductance paths."
      },
      {
        "number": "19",
        "name": "HO",
        "type": "output",
        "description": "High-side N-channel MOSFET gate drive output, connected to the high-side synchronous MOSFET gate through a short, low-inductance path."
      },
      {
        "number": "20",
        "name": "BST",
        "type": "power_out",
        "description": "High-side driver bootstrap supply, connected to the bootstrap diode cathode and bootstrap capacitor, with an internal charge pump supplying 200 µA for bypass operation."
      },
      {
        "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-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet provided is for the automotive LM5122-Q1. The ordering addendum (page 45) lists LM5122; The VCC pin is typed P/O/I in the datasheet, meaning it can be a regulator output or an external sup; BST is typed P (power) in the datasheet and is mapped to power_out because it is driven by the inter",
          "exposed pad 21 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0597,
        "at": "2026-10-11T21:07:48"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm5122-q1",
        "pages": 50,
        "sha256": "89895d7bdb8309ba",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "units": "mm",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "a8872cb0b62b93579312f88544e57df224168911d4c6e3502ba8fc2496c3585e",
        "checked": "2026-10-11",
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      },
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        "zmin_mm": 0.0,
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        "sha256": "8b8904ca0fc371923716a727c974ba975ee758ba88725e227a7f38cf46fe996a",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "HTSSOP-20",
      "Category": "Power Supply Chip",
      "Pins": "21"
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
    "lm5122qmh"
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  "discovery_pitch": "LM5122QMH (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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