PJ4054B

{
  "schema_version": 1,
  "type": "component",
  "slug": "pj4054b",
  "title": "PJ4054B",
  "brief": "PJSEMI Battery Management, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "pj4054b"
  ],
  "component": {
    "mpn": "PJ4054B",
    "manufacturer": "PJSEMI",
    "package": "SOT-23-5",
    "pin_count": 5,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2110272230_PJSEMI-PJ4054B_C2911335.pdf",
    "parts": {
      "symbol": "pj4054b.kicad_sym",
      "footprint": "pj4054b.kicad_mod",
      "model_3d": "pj4054b-etched.glb",
      "model_3d_plain": "pj4054b.glb",
      "model_3d_step": "pj4054b-etched.step",
      "model_3d_step_plain": "pj4054b.step",
      "lbr": "pj4054b.lbr"
    },
    "distributor_links": {
      "lcsc": "C2911335"
    },
    "pins": [
      {
        "number": "1",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain charge-status output. Pulled low by an internal N-channel MOSFET while battery charging is in progress (VCHRG(low) <= 0.6V at ICHRG = 5mA). Goes high-impedance when the charge cycle terminates or when VCC is in undervoltage lockout. Typically drives an indicator LED to VIN through a series resistor (e.g. 1k)."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference."
      },
      {
        "number": "3",
        "name": "BAT",
        "type": "power_out",
        "description": "Charging current output to the lithium-ion battery. Regulates the final float voltage to 4.2V (typ, 4.158-4.242V) via a precise internal resistor divider that is disconnected in shutdown. Sourcing capability up to 500mA (typical) set by RPROG. Bypass with ~10uF ceramic capacitor to ground."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive input supply to the charger. Operating range 4.25V to 6.5V (absolute max VSS+7V); bypass with at least 1uF (typically 4.7uF) to GND. When VCC falls to within ~30mV of VBAT, or below the UVLO threshold (~3.8V), the part enters standby/stop mode and IBAT drops below ~2uA."
      },
      {
        "number": "5",
        "name": "PROG",
        "type": "bidirectional",
        "description": "Charge current programming, monitor, and manual-shutdown pin. Connect a 1% resistor RPROG from PROG to GND: IBAT = (VPROG/RPROG) * 1000 (e.g. 2kOhm -> 500mA, 10kOhm -> 100mA). Pin regulates to 1V (typ) in constant-current mode and can be measured as a current-monitor output. Leaving the resistor floating pulls the pin above the 1.21V (typ) shutdown threshold via an internal ~2.5uA (2uA typ) pull-up, forcing the charger into stop mode (ICC ~= 25uA)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2110272230_PJSEMI-PJ4054B_C2911335.pdf",
        "pages": 6,
        "sha256": "71f5fc869da0b682",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-5@sha256:455a3f7c3e5eb5b8",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "pj4054b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "pj4054b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "41ad64638a3b476b790fcb538591c37d9f3a0852efb6c24e40838484d7b3418b",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "PJSEMI",
      "Package": "SOT-23-5",
      "Category": "PMIC",
      "Pins": "5"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "pj4054b"
  ],
  "discovery_pitch": "PJ4054B (PJSEMI) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "pj4054b.kicad_sym",
    "pj4054b.kicad_mod",
    "pj4054b.glb",
    "pj4054b.step",
    "pj4054b-etched.step",
    "pj4054b.lbr",
    "docs/hero.png",
    "docs/pj4054b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T04:23:46.010Z"
}