🔋 Li-Ion Battery Charging Module with MCP73831

This project is a compact and reliable single-cell Li-Ion/Li-Po battery charging board using the MCP73831T-2ACI/OT linear charger IC. Designed for prototyping, IoT devices, and embedded systems requiring safe and simple battery charging from a 5V USB or adapter input.

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📦 Features

• ✅ Input overvoltage and surge protection (TVS diode + fuse)
• ✅ Single-cell Li-Ion/Li-Po battery charging (4.2V, 500 mA)
• ✅ Charging status LED indicator (ON during charging, OFF when fully charged)
• ✅ Clean and simple 2-layer PCB design
• ✅ Output connector for system power
• ✅ Mounting holes and large battery cutout for easy integration

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⚙️ Technical Specifications

Parameter	Value
Charging IC	MCP73831T-2ACI/OT
Input Voltage	5V DC
Charging Current	500 mA (set via 2 kΩ resistor)
Battery Voltage	3.7V Nominal (4.2V max)
Capacitors	10µF & 4.7µF Ceramic
Protections	Fuse, TVS Diode

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🧩 Schematic & PCB

The design is created using KiCad and includes:

• Complete schematic (.sch)
• PCB layout (.kicad_pcb)
• Gerber files for fabrication
• Bill of Materials (BOM)

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🛡️ Battery Protection

⚠️ Note: This board does not include battery protection circuitry.
Use protected Li-Ion cells or add an external battery protection module (e.g., DW01 + FS8205A) to ensure safe operation.

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🖼️ Preview

📷 PCB Layout (Top View)

📄 Schematic PDF

View Schematic PDF

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📁 License

This project is licensed under the MIT License.
Feel free to use, modify, and distribute with attribution.

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🤝 Contributions

Pull requests and suggestions are welcome!
Feel free to open issues for improvements or bugs.

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📧 Contact

Created by Nishanth Kiruthivasan
📬 [email protected] | [email protected]

🔗 Website