TP 4056 LITHIUM BATTERY CHARGING MODULE

The **TP4056** is a linear Li-Ion battery charger module with onboard protection features. It’s commonly used to charge single-cell 3.7V Lithium-ion batteries through a micro-USB or external DC power supply.

Working

The TP4056 operates as a constant current/constant voltage linear charger. It uses internal transistors to limit the charge current and applies a precise 4.2V charging voltage to the battery. This ensures the battery is charged safely and efficiently.

The module includes overvoltage, overcurrent, and temperature protection for reliable operation. Additionally, its onboard LEDs indicate charging status:

• **Red LED (CHRG)**: Charging
• **Green LED (FULL)**: Fully charged

Pinout

Pin	Name	Description
1	BAT+	Positive terminal of the battery
2	BAT-	Negative terminal of the battery
3	IN+	Positive input voltage (4.5–6V)
4	IN-	Negative input voltage (GND)
5	OUT+	Output positive voltage (optional load)
6	OUT-	Output negative voltage (optional load)