TD8655

{
  "slug": "td8655",
  "version": "0.1.0",
  "type": "component",
  "description": "Techcode Semicon DC-DC Converters, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "td8655",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "td8655.kicad_sym",
    "td8655.kicad_mod",
    "td8655.glb",
    "td8655.step",
    "td8655.lbr",
    "docs/hero.png",
    "docs/td8655-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "td8655-hero.glb",
    "td8655-hero.overlay.json",
    "td8655-etched.glb"
  ],
  "component": {
    "mpn": "TD8655",
    "manufacturer": "Techcode Semicon",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883841641955328",
    "parts": {
      "symbol": "td8655.kicad_sym",
      "footprint": "td8655.kicad_mod",
      "model_3d": "td8655-hero.glb",
      "model_3d_plain": "td8655-etched.glb",
      "model_3d_step": "td8655-etched.step",
      "model_3d_step_plain": "td8655.step",
      "lbr": "td8655.lbr"
    },
    "distributor_links": {
      "lcsc": "C232927"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T21:13:29Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BST",
        "type": "power_out",
        "description": "Internal high-side driver power bias, typically 5.4V above VIN, with a typical 0.1uF capacitor connected between BST and SW."
      },
      {
        "number": "2",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply input, recommended 9V to 40V with absolute maximum rating of -0.3 to +43V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Input current sense; absolute maximum rating ISENSE to VIN is -0.3 to +0.3 V."
      },
      {
        "number": "4",
        "name": "COMP",
        "type": "passive",
        "description": "Error amplifier output where the converter stability compensation network is placed; absolute maximum rating to GND is -0.3 to +6 V."
      },
      {
        "number": "5",
        "name": "FREQ",
        "type": "input",
        "description": "Switching frequency setting: a 120k to 30k ohm resistor to GND sets FSW=12000k/RF, and a floating pin gives 200kHz."
      },
      {
        "number": "6",
        "name": "FB",
        "type": "input",
        "description": "Feedback input referenced to 1.20V (VFB), set by a resistor divider between VOUT and GND; absolute maximum rating -0.3 to +6 V."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "On/off control pin; electrical characteristics are specified with EN=3V."
      },
      {
        "number": "8",
        "name": "ISET",
        "type": "input",
        "description": "Sets the output constant-current level, with VISET = 1.2V x (R18/(R18+R19)); absolute maximum rating -0.3 to +6 V."
      },
      {
        "number": "9",
        "name": "COUT1",
        "type": "input",
        "description": "Current limit of the 1st output; threshold voltage is 108mV across the sense resistor RCS1 (IOC = 108mV/RCS)."
      },
      {
        "number": "10",
        "name": "COUT2",
        "type": "input",
        "description": "Current limit of the 2nd output; threshold voltage is 108mV across the sense resistor RCS2 (IOC = 108mV/RCS)."
      },
      {
        "number": "11",
        "name": "COUT3",
        "type": "input",
        "description": "Current limit of the 3rd output; threshold voltage is 108mV across the sense resistor RCS3 (IOC = 108mV/RCS)."
      },
      {
        "number": "12",
        "name": "COUT4",
        "type": "input",
        "description": "Current limit of the 4th output; threshold voltage is 108mV across the sense resistor RCS4 (IOC = 108mV/RCS); absolute maximum rating to GND is -0.3 to +0.3 V."
      },
      {
        "number": "13",
        "name": "CS34",
        "type": "input",
        "description": "Pull low to disable the COUT3/COUT4 constant-current function, and high to enable it."
      },
      {
        "number": "14",
        "name": "SS",
        "type": "passive",
        "description": "Soft-start pin; a capacitor is connected between this pin and GND (typical soft-start time 10 ms with CSS = 0.1uF)."
      },
      {
        "number": "15",
        "name": "TS",
        "type": "passive",
        "description": "Test pin; the datasheet gives no functional description or connection requirement."
      },
      {
        "number": "16",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "17",
        "name": "LSD",
        "type": "output",
        "description": "Low-side driver output for the external low-side power NMOS in the synchronous configuration."
      },
      {
        "number": "18",
        "name": "VDD",
        "type": "power_out",
        "description": "Internal 5.4V power supply; a 1uF (or more) capacitor is connected between this pin and GND."
      },
      {
        "number": "19",
        "name": "SW",
        "type": "passive",
        "description": "Inductor terminal (switch node); absolute maximum rating SW to GND is -0.3 to VIN+0.6 V."
      },
      {
        "number": "20",
        "name": "HSD",
        "type": "output",
        "description": "High-side driver output for the external high-side power NMOS in the synchronous configuration."
      },
      {
        "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 package hint says QFN-20-EP(4x4), but the datasheet lists only pins 1-20 and gives no exposed-pa; Figure 1 (top-view pin configuration) is an image and its pin layout could not be verified from text; Pin types are inferred from the function descriptions because the datasheet does not state electrica",
          "exposed pad 21 added from the footprint"
        ],
        "pages_sent": 12,
        "cost_usd": 0.0514,
        "at": "2026-10-20T21:10:35"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883841641955328",
        "pages": 12,
        "sha256": "85d02fd146ba7500",
        "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"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.0,
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        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "td8655-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0.0,
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        "footprint_binding": "identity",
        "sha256": "3b94cad589ec122ef546a52015d15d17be20c757335e9fc181da1caf865af148",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}