LM5642MHX

{
  "slug": "lm5642mhx",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments DC-DC Converters, HTSSOP-28-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "lm5642mhx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
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    "README.md",
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    "lm5642mhx.glb",
    "lm5642mhx.step",
    "lm5642mhx.lbr",
    "docs/hero.png",
    "docs/lm5642mhx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm5642mhx-hero.glb",
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  "component": {
    "mpn": "LM5642MHX",
    "manufacturer": "Texas Instruments",
    "package": "HTSSOP-28-EP",
    "pin_count": 29,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm5642x",
    "parts": {
      "symbol": "lm5642mhx.kicad_sym",
      "footprint": "lm5642mhx.kicad_mod",
      "model_3d": "lm5642mhx-hero.glb",
      "model_3d_plain": "lm5642mhx.glb",
      "model_3d_step": "lm5642mhx-etched.step",
      "model_3d_step_plain": "lm5642mhx.step",
      "lbr": "lm5642mhx.lbr"
    },
    "distributor_links": {
      "lcsc": "C2879320"
    },
    "distributor_check": {
      "checked_at": "2026-10-12T11:02:09Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "KS1",
        "type": "input",
        "description": "Positive Kelvin sense input for the Channel 1 current-sense amplifier, which must be routed on a separate trace and connected to VIN as close as possible to the current-sense resistor (or to the upper MOSFET drain when no sense resistor is used)."
      },
      {
        "number": "2",
        "name": "ILIM1",
        "type": "passive",
        "description": "Channel 1 current-limit threshold pin that sinks a constant 9.9 µA through a resistor connected to VIN, and the resulting voltage is compared with the top MOSFET VDS or the sense-resistor voltage to detect overcurrent."
      },
      {
        "number": "3",
        "name": "COMP1",
        "type": "passive",
        "description": "Output of the internal transconductance error amplifier for Channel 1, with the loop compensation network connected between this pin and SGND (pin 8)."
      },
      {
        "number": "4",
        "name": "FB1",
        "type": "input",
        "description": "Channel 1 feedback input, connected to VOUT through a voltage divider to set the output voltage adjustable from 1.3V to 90% of Vin."
      },
      {
        "number": "5",
        "name": "SYNC",
        "type": "input",
        "description": "Switching-frequency synchronization input: LOW free-runs at 200 kHz (LM5642) or 375 kHz (LM5642X) with channels 180° out of phase, HIGH waits for an external clock, and a falling edge starts Channel 1 HDRV with Channel 2 HDRV 2.5 µs later, requiring a SYNC pulse width greater than 100 ns; LOW operation requires a 220 kΩ resistor to signal ground."
      },
      {
        "number": "6",
        "name": "UV_DELAY",
        "type": "passive",
        "description": "A capacitor from this pin to ground sets the output under-voltage protection delay, charged from a 5 µA source, with the system latching off when the pin reaches 2.3V (typical); connecting this pin to ground disables output under-voltage protection."
      },
      {
        "number": "7",
        "name": "VLIN5",
        "type": "power_out",
        "description": "Output of the internal 5V LDO derived from VIN that biases the chip and powers the bootstrap gate-drive circuitry, and it must be bypassed to SGND with a minimum of 4.7 µF ceramic capacitor."
      },
      {
        "number": "8",
        "name": "SGND",
        "type": "power_in",
        "description": "Signal-level ground connection, which should be connected to the ground rail of the system."
      },
      {
        "number": "9",
        "name": "ON/SS1",
        "type": "input",
        "description": "Channel 1 enable pin, internally pulled up to one diode drop above VLIN5 and open-collector type, where pulling it below 1.2V turns off Channel 1 and pulling both ON/SS1 and ON/SS2 below 1.2V shuts down the whole chip, with an optional capacitor providing soft-start."
      },
      {
        "number": "10",
        "name": "ON/SS2",
        "type": "input",
        "description": "Channel 2 enable pin with the same behavior as ON/SS1 (pin 9), pulled below 1.2V to turn off Channel 2, and it may be connected to ON/SS1 for simultaneous startup or parallel operation."
      },
      {
        "number": "11",
        "name": "FB2",
        "type": "input",
        "description": "Channel 2 feedback input, connected to VOUT through a voltage divider to set the Channel 2 output voltage."
      },
      {
        "number": "12",
        "name": "COMP2",
        "type": "passive",
        "description": "Output of the internal transconductance error amplifier for Channel 2, with the loop compensation network connected between this pin and SGND (pin 8)."
      },
      {
        "number": "13",
        "name": "ILIM2",
        "type": "passive",
        "description": "Channel 2 current-limit threshold setting with the same function as ILIM1 (pin 2)."
      },
      {
        "number": "14",
        "name": "KS2",
        "type": "input",
        "description": "Positive Kelvin sense input for the Channel 2 current-sense amplifier, with the same function as KS1 (pin 1)."
      },
      {
        "number": "15",
        "name": "RSNS2",
        "type": "input",
        "description": "Negative Kelvin sense input for Channel 2, connected to the low side of the current-sense resistor between VIN and the top MOSFET drain, or to the top MOSFET source when its RDS(on) is used for sensing, with a separate Kelvin trace."
      },
      {
        "number": "16",
        "name": "SW2",
        "type": "passive",
        "description": "Switch-node connection for Channel 2 to the source of the top MOSFET, which serves as the negative supply rail for the top-side gate driver HDRV2."
      },
      {
        "number": "17",
        "name": "HDRV2",
        "type": "output",
        "description": "Floating top-side gate-drive output for Channel 2 that rides on the SW2 switching-node voltage."
      },
      {
        "number": "18",
        "name": "CBOOT2",
        "type": "passive",
        "description": "Bootstrap capacitor connection that provides the positive supply rail for the Channel 2 top-side gate drive, connected to VDD2 through a diode with the bootstrap capacitor low side tied to SW2."
      },
      {
        "number": "19",
        "name": "VDD2",
        "type": "power_in",
        "description": "Supply rail for the Channel 2 low-side gate drive, connected to VLIN5 through a 4.7Ω resistor, bypassed to power ground with a ceramic capacitor of at least 1 µF, and tied to VDD1 (pin 24)."
      },
      {
        "number": "20",
        "name": "LDRV2",
        "type": "output",
        "description": "Low-side gate-drive output for Channel 2."
      },
      {
        "number": "21",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground connection for both channels, which should be connected to the ground rail of the system."
      },
      {
        "number": "22",
        "name": "VIN",
        "type": "power_in",
        "description": "Power input for the chip that must be connected to the positive input rail and to the same voltage rail as the top FET drain (or the current-sense resistor when used)."
      },
      {
        "number": "23",
        "name": "LDRV1",
        "type": "output",
        "description": "Low-side gate-drive output for Channel 1."
      },
      {
        "number": "24",
        "name": "VDD1",
        "type": "power_in",
        "description": "Supply rail for the Channel 1 low-side gate drive, which must be tied to VDD2 (pin 19)."
      },
      {
        "number": "25",
        "name": "CBOOT1",
        "type": "passive",
        "description": "Bootstrap capacitor connection that provides the positive supply rail for the Channel 1 top-side gate drive, with the same connection rules as CBOOT2 (pin 18)."
      },
      {
        "number": "26",
        "name": "HDRV1",
        "type": "output",
        "description": "Top-side gate-drive output for Channel 1, floating on the SW1 switching-node voltage with the same behavior as HDRV2 (pin 17)."
      },
      {
        "number": "27",
        "name": "SW1",
        "type": "passive",
        "description": "Switch-node connection for Channel 1 to the source of the top MOSFET, serving as the negative supply rail for the top-side gate driver HDRV1, with the same connection rules as SW2 (pin 16)."
      },
      {
        "number": "28",
        "name": "RSNS1",
        "type": "input",
        "description": "Negative Kelvin sense input for the Channel 1 current-sense amplifier, with the same connection rules as RSNS2 (pin 15)."
      },
      {
        "number": "29",
        "name": "DAP",
        "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 exposed pad is labeled DAP on the datasheet, not a numbered pin, so it is listed with number 'DA; The pinout is taken from the pin lists and connection diagrams on pages 2-3, which cover both the TS; Pin types are assigned from the functional descriptions because the datasheet does not give KiCad ER",
          "exposed pad 29 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 8,
        "cost_usd": 0.0694,
        "at": "2026-10-12T11:01:55"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm5642x",
        "pages": 44,
        "sha256": "08d8cf8715d650c6",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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        "seat": "z = 0",
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        "checked": "2026-10-12",
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      {
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        "checked": "2026-10-12",
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  }
}