4056D

{
  "slug": "4056d",
  "version": "0.2.1",
  "type": "component",
  "description": "HL Battery Management, ESOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "pmic",
    "4056d"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "4056d.kicad_sym",
    "4056d.kicad_mod",
    "4056d.glb",
    "4056d.step",
    "4056d-etched.step",
    "4056d.lbr",
    "docs/hero.png",
    "docs/4056d-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "pads.json",
    "4056d-hero.glb",
    "4056d-hero.overlay.json"
  ],
  "component": {
    "mpn": "4056D",
    "manufacturer": "HL",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2310121801_HL-4056D_C18164399.pdf",
    "parts": {
      "symbol": "4056d.kicad_sym",
      "footprint": "4056d.kicad_mod",
      "model_3d": "4056d-hero.glb",
      "model_3d_plain": "4056d.glb",
      "model_3d_step": "4056d-etched.step",
      "model_3d_step_plain": "4056d.step",
      "lbr": "4056d.lbr"
    },
    "distributor_links": {
      "lcsc": "C18164399"
    },
    "pins": [
      {
        "number": "1",
        "name": "TEMP",
        "type": "input",
        "description": "Battery temperature sense input. Tied to the midpoint of an external NTC/resistor divider from VCC; charging is suspended when V(TEMP) falls outside 45%*VCC..80%*VCC. Tie to GND to disable temperature monitoring."
      },
      {
        "number": "2",
        "name": "PROG",
        "type": "bidirectional",
        "description": "Constant-current program pin and charge-current monitor. A resistor R_PROG to GND sets I_BAT = 1100 / R_PROG (A) (e.g. 1kΩ → 1000mA). Pin regulates to ~1.0V in current mode; leaving it floating puts the device into shutdown."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Also connected to the exposed thermal pad on the bottom of the ESOP-8 package for heat dissipation."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive input supply, 4.2V to 9.0V (typ. 5V, absolute max 9V). Bypass with 10µF to GND. UVLO threshold ~3.6V; VCC-adaptive circuit engages at ~4.3V to reduce charge current if the source droops."
      },
      {
        "number": "5",
        "name": "BAT",
        "type": "power_out",
        "description": "Charge current output to the Li-ion battery positive terminal. Regulates to 4.2V float (±1%); delivers programmed CC current up to 1A, trickle current ~230mA below V_TRIKL (2.9V). Bypass with 10µF; reverse-battery protected (leakage <5mA)."
      },
      {
        "number": "6",
        "name": "STDBY",
        "type": "output",
        "description": "Open-drain charge-complete (standby) indicator, active-low. Pulled low (typ. 0.3V at 5mA) when the battery is fully charged; high-impedance otherwise. Typically drives a green LED to VCC."
      },
      {
        "number": "7",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain charge-in-progress indicator, active-low. Pulled low (typ. 0.3V at 5mA) while charging; high-impedance when done or in fault. Blinks ~1-2s period to signal 'no battery' when TEMP is tied to GND."
      },
      {
        "number": "8",
        "name": "CE",
        "type": "input",
        "description": "Chip enable input. Drive high to enable charging; drive low to place the device in shutdown (battery leakage <1µA, supply current <70µA). Absolute max range -0.3V to 10V."
      },
      {
        "number": "9",
        "name": "EXPOSED PAD",
        "type": "power_in",
        "description": "Exposed thermal pad. Present in the package land pattern; connect it per the manufacturer datasheet thermal recommendation. Added because the footprint carries this pad and the symbol had no pin for it.",
        "source": "derived-from-footprint"
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2310121801_HL-4056D_C18164399.pdf",
        "pages": 10,
        "sha256": "86254f07866bff7b",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "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": "4056d.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": "4056d-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": "c28723b9c4b2854cbefd7f0c837a8bee76fb410d33a74a5950aaf1ea84d31d50",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "title": "4056D",
  "brief": "HL Battery Management, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "metadata": {
    "specs": {
      "Manufacturer": "HL",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "discovery_triggers": [
    "4056d"
  ],
  "discovery_pitch": "4056D (HL) component page with datasheet-verified CAD.",
  "visibility": "public"
}