HT27403ARQZ

{
  "slug": "ht27403arqz",
  "version": "0.1.0",
  "type": "component",
  "description": "HTCSEMI DC-DC Converters, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "ht27403arqz",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ht27403arqz.kicad_sym",
    "ht27403arqz.kicad_mod",
    "ht27403arqz.glb",
    "ht27403arqz.step",
    "ht27403arqz.lbr",
    "docs/hero.png",
    "docs/ht27403arqz-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ht27403arqz-hero.glb",
    "ht27403arqz-hero.overlay.json",
    "ht27403arqz-etched.glb"
  ],
  "component": {
    "mpn": "HT27403ARQZ",
    "manufacturer": "HTCSEMI",
    "package": "QFN-24-EP(4x4)",
    "pin_count": 25,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/6f7cb78bdaec8985ca1d1fb4318ce6ea.pdf",
    "parts": {
      "symbol": "ht27403arqz.kicad_sym",
      "footprint": "ht27403arqz.kicad_mod",
      "model_3d": "ht27403arqz-hero.glb",
      "model_3d_plain": "ht27403arqz-etched.glb",
      "model_3d_step": "ht27403arqz-etched.step",
      "model_3d_step_plain": "ht27403arqz.step",
      "lbr": "ht27403arqz.lbr"
    },
    "distributor_links": {
      "lcsc": "C47326432"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T07:51:14Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SS/TRACK",
        "type": "bidirectional",
        "description": "Soft-start or tracking input: a 3-µA source charges the capacitor to GND until the reference reaches 0.6 V, and the pin can also be driven by an external voltage source for tracking."
      },
      {
        "number": "2",
        "name": "RS",
        "type": "input",
        "description": "Negative remote sense input that removes the voltage drop between GND and the local ground at the load, with an RC filter to GND in noisy environments and RS-to-GND connection at the IC if unused; RS pin voltage is limited to -0.1 V to 0.1 V."
      },
      {
        "number": "3",
        "name": "FB",
        "type": "input",
        "description": "Voltage-mode error-amplifier inverting input that sets the output voltage, held at 0.6 V ±1% in closed-loop regulation."
      },
      {
        "number": "4",
        "name": "COMP",
        "type": "output",
        "description": "Error-amplifier output that is connected to FB through a compensation network to ensure loop stability."
      },
      {
        "number": "5",
        "name": "FADJ",
        "type": "input",
        "description": "Frequency adjust input: a resistor between this pin and GND sets the switching frequency, programmable from 200 kHz to 1.2 MHz."
      },
      {
        "number": "6",
        "name": "SYNC",
        "type": "input",
        "description": "Synchronization input for PLL locking to an external clock; the frequency defaults to the FADJ setting when no SYNC signal is present, the pin voltage is rated 0 V to 5.5 V, and it should be tied to GND if not used."
      },
      {
        "number": "7",
        "name": "UVLO/EN",
        "type": "input",
        "description": "Precision UVLO/enable input with a 1.15 V rising enable threshold, a 0.985 V falling threshold, and a 1.8 µA initial pullup; the pin voltage is rated 0 V to min(VIN, 5.5 V)."
      },
      {
        "number": "8",
        "name": "OTP",
        "type": "input",
        "description": "Overtemperature protection setpoint pin: a resistor and 0.1-µF capacitor to GND set the OTP threshold, and it should be connected to GND if system-level OTP is not required."
      },
      {
        "number": "9",
        "name": "D+",
        "type": "input",
        "description": "External temperature sense input for a 2N3904-type NPN remote thermal diode (base and collector shorted), used for inductor DCR drift compensation and system thermal shutdown."
      },
      {
        "number": "10",
        "name": "D-",
        "type": "input",
        "description": "Return path for the external thermal diode, routed as a differential pair with D+ and connected to GND."
      },
      {
        "number": "11",
        "name": "PGOOD",
        "type": "output",
        "description": "Open-drain power-good output that goes low during fault or unregulated conditions and requires an external pullup to VDD or an external rail; it has a 20-µs deglitch filter and must not exceed 5.5 V."
      },
      {
        "number": "12",
        "name": "VIN",
        "type": "power_in",
        "description": "Input voltage rail (3.0 V to 20 V recommended) that provides PWM feedforward and the internal bias supply, to be decoupled locally with a 1-µF ceramic capacitor."
      },
      {
        "number": "13",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground for power and signal return, including the low-side MOSFET gate return, soft-start capacitor, OTP resistor, and frequency-adjust resistor."
      },
      {
        "number": "14",
        "name": "VDD",
        "type": "power_out",
        "description": "Subregulated 4.7 V internal bias rail (recommended 2.6 V to 5.5 V) for gate drive and CBOOT, to be decoupled with a 10-µF ceramic capacitor and not used to drive auxiliary loads."
      },
      {
        "number": "15",
        "name": "LG",
        "type": "output",
        "description": "Low-side N-FET gate drive output."
      },
      {
        "number": "16",
        "name": "SW",
        "type": "passive",
        "description": "Power-stage switch-node connection that also serves as the high-side gate driver return; recommended SW pin voltage is -0.3 V to 20 V."
      },
      {
        "number": "17",
        "name": "HG",
        "type": "output",
        "description": "High-side N-FET gate drive output."
      },
      {
        "number": "18",
        "name": "CBOOT",
        "type": "power_out",
        "description": "High-side bootstrap supply for the high-side gate driver, to be connected to SW through a 100-nF ceramic capacitor."
      },
      {
        "number": "19",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet specifies to connect this pin directly to GND."
      },
      {
        "number": "20",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet specifies to connect this pin directly to GND."
      },
      {
        "number": "21",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet specifies to connect this pin directly to GND."
      },
      {
        "number": "22",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet specifies to connect this pin directly to GND."
      },
      {
        "number": "23",
        "name": "CS+",
        "type": "input",
        "description": "Noninverting input to the current-sense comparator for DCR-based overcurrent sensing; the CS+ to CS- differential is limited to ±1 V."
      },
      {
        "number": "24",
        "name": "CS-",
        "type": "input",
        "description": "Inverting input to the current-sense comparator, providing 9.9 µA of nominal offset current at room temperature to adjust the current-limit setpoint."
      },
      {
        "number": "25",
        "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 exposed pad is not a numbered pin and the datasheet does not explicitly assign it to GND; it is ; Pins 19-22 are listed as NC in one table row. They are typed unconnected per KiCad, but the datashee; SW is listed as P (power) in the datasheet; typed passive here as a switch node. Adjust if your ERC ",
          "exposed pad 25 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint",
          "1/25 pins cited to the wrong page (name found elsewhere): ['21:NC@p3']"
        ],
        "pages_sent": 4,
        "cost_usd": 0.0546,
        "at": "2026-10-18T07:50:21"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/6f7cb78bdaec8985ca1d1fb4318ce6ea.pdf",
        "pages": 50,
        "sha256": "c1eb0b3a75c57ec6",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 25,
        "described": 25,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "096fc110543e6d324c5120c2d38e3dca87a389da9b6fac234f1fe40856295ef4",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ht27403arqz-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "footprint_binding": "identity",
        "sha256": "35016123ddcaf2d0eea1787210181273fe3fc9949489f733c6091a3605599f4b",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}