Charger Board

Charger-Board

TP4056 Lithium-Ion Battery Charger Board

📌 Project Overview

This project presents the design and implementation of a Lithium-Ion Battery Charger Board using the TP4056 IC. The TP4056 is a complete constant-current/constant-voltage linear charger designed for charging single-cell lithium-ion and lithium-polymer batteries.

The charger board accepts 5V input through a USB Type-C connector and safely charges a 3.7V Li-ion battery with charging status indication using LEDs.

The schematic and PCB are designed using KiCad.

🔧 Components Used Component Value TP4056-42-ESOP8 Battery Charging IC USB Type-C Connector Power Input Battery Connector JST-PH 2-Pin R1 1.2 kΩ R2 1 kΩ R3 1 kΩ C1 10 µF C2 10 µF D1 Charging LED D2 Fully Charged LED ⚡ Features USB Type-C input Supports single-cell 3.7V Li-ion/Li-Po batteries Constant Current / Constant Voltage charging Automatic charge termination Charging status indication Thermal regulation Battery protection compatibility Compact PCB design 🔌 Circuit Description

The TP4056 charger operates using the CC/CV charging method.

Stage 1: Constant Current Charging

The battery is charged with a fixed current determined by the resistor connected to the PROG pin.

Stage 2: Constant Voltage Charging

When the battery voltage reaches 4.2V, the TP4056 maintains a constant voltage and gradually reduces the charging current.

Charge Completion

Charging stops automatically when the charging current drops to approximately 10% of the programmed value.

Charging current:

Icharge ≈ 1000 mA 💡 LED Indication LED Status Meaning CHRG LED ON Charging STDBY LED ON Battery Fully Charged 🛠️ Software Used KiCad KiCad Schematic Editor KiCad PCB Editor ERC (Electrical Rules Check) DRC (Design Rule Check) 📁 Project Structure TP4056-Charger/ │ ├── README.md ├── TP4056.kicad_sch ├── TP4056.kicad_pcb ├── Gerber/ ├── Images/ │ ├── Schematic.png │ └── PCB.png └── Datasheet/ └── TP4056.pdf 📦 Recommended Footprints Component Footprint TP4056 SOIC-8-1EP_3.9x4.9mm Resistors R_0805 Capacitors C_0805 LEDs LED_0805 USB Type-C Depends on connector Battery Connector JST_PH_2Pin 🚀 Applications Power banks Portable electronics DIY battery packs IoT devices Wearable devices Rechargeable gadgets 📷 Circuit Diagram

Add your KiCad schematic image:

📚 References TP4056 Datasheet KiCad Documentation USB Type-C Specification 👨‍💻 Author

Manideep

Designed using KiCad for learning PCB design and battery charging circuits.