TD1688

{
  "schema_version": 1,
  "type": "component",
  "slug": "td1688",
  "title": "TD1688",
  "brief": "Techcode Semicon DC-DC Converters, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "td1688"
  ],
  "component": {
    "mpn": "TD1688",
    "manufacturer": "Techcode Semicon",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a4d5037d01ce7a1ad454f4a64f7a2df5.pdf",
    "parts": {
      "symbol": "td1688.kicad_sym",
      "footprint": "td1688.kicad_mod",
      "model_3d": "td1688-etched.glb",
      "model_3d_plain": "td1688.glb",
      "model_3d_step": "td1688-etched.step",
      "model_3d_step_plain": "td1688.step",
      "lbr": "td1688.lbr"
    },
    "distributor_links": {
      "lcsc": "C397880"
    },
    "pins": [
      {
        "number": "1",
        "name": "SW",
        "type": "output",
        "description": "Power switching output; drain of the internal N-channel power MOSFET (RDS(ON) ≈ 0.7Ω). Connects to the external inductor and Schottky freewheeling diode to supply the output LC filter. Switches between VIN and near-GND at 480 kHz."
      },
      {
        "number": "2",
        "name": "EN",
        "type": "input",
        "description": "On/Off enable input. Pull above VEN_R ≈ 1.35V (falling threshold ≈ 1.17V, hysteresis ≈ 180mV) to turn the device on. For automatic enable, connect to VIN through a 1MΩ resistor. Absolute max 6V."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected. Leave floating or tie to ground; no internal bond."
      },
      {
        "number": "4",
        "name": "FB",
        "type": "input",
        "description": "Feedback input to the internal error amplifier. Regulates to a 0.812V bandgap reference (0.792-0.832V). Connect to the tap of an external resistor divider from VOUT to GND. Frequency-foldback engages when FB < 300mV to limit short-circuit current."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Signal/analog ground and voltage reference for the regulated output. Isolate this node from the D1-to-C1 high-current ground path to prevent switching current spikes from being induced into the sensitive analog reference."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected. Leave floating or tie to ground; no internal bond."
      },
      {
        "number": "7",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply voltage input. Operates from 11V to 60V unregulated input (absolute max 60V). Requires a local bypass capacitor (C1, typ. 1µF ceramic X5R/X7R) to prevent large voltage spikes at the input."
      },
      {
        "number": "8",
        "name": "BST",
        "type": "passive",
        "description": "Bootstrap capacitor node for the high-side gate driver. Connect a 0.1µF capacitor between SW and BST to form a floating supply that drives the power switch gate above VIN. Absolute max VBST = VSW-0.3 to VSW+6V."
      },
      {
        "number": "9",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal pad. Electrically GND. Connect to the system ground plane with a large copper area for good thermal conductivity and low-impedance return; critical for maintaining junction temperature within limits (θJA ≈ 50°C/W)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/a4d5037d01ce7a1ad454f4a64f7a2df5.pdf",
        "pages": 8,
        "sha256": "4efdec95ca3aa43f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm@sha256:5848244c5e72002e",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "td1688.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "td1688-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "45ebf1ebb0134ea3d415f9bcc6c3064e07cd79f6dfd985f792a525a06c186b20",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Techcode Semicon",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "9"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "td1688"
  ],
  "discovery_pitch": "TD1688 (Techcode Semicon) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "td1688.kicad_sym",
    "td1688.kicad_mod",
    "td1688.glb",
    "td1688.step",
    "td1688-etched.step",
    "td1688.lbr",
    "docs/hero.png",
    "docs/td1688-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "TD1688M",
      "kind": "packaging"
    },
    {
      "mpn": "TD1688MR",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T09:33:43.713Z"
}