TP4056 use precautions

Chip Ceramic Capacitor

6035 18.432 Ceramic

Probe Current Voltage Pin 420*4450 Head Diameter 5.0 Over Current and Voltage Pin

MOS Power IC Full Range

1. TP4056 is packaged in SOP8-PP. When using, the bottom heat sink and PCB board must be soldered properly. The heat dissipation area on the bottom should have holes filled and use a large copper foil for better thermal performance. Multi-layer PCBs with sufficient vias also improve heat dissipation. Poor heat management can lead to reduced charging current due to temperature protection. Adding proper vias on the back of the SOP8 package helps with manual soldering by allowing solder to flow through the vias for a stronger connection.

2. For high-current charging (700mA or more), it's essential to increase the heat dissipation resistance, ideally between 0.2Ω and 0.5Ω. The customer should choose the right resistor size based on their specific application.

3. In the TP4056 design, the 10uF capacitor at the BAT terminal should be placed as close as possible to the chip’s BAT pin to ensure stable operation.

4. During testing, the BAT terminal should be directly connected to the battery. Avoid connecting an ammeter in series; instead, connect it to the VCC terminal for accurate readings.

5. To prevent damage from voltage spikes or glitches, it's recommended to place a 0.1uF ceramic capacitor near both the BAT terminal and the power input, as close to the TP4056 chip as possible during wiring.

6. TP4056 is not designed for reverse battery connections. Reversing the battery may damage the device. However, there is an anti-reverse protection circuit built-in to prevent such issues.

Please use a power supply between 4.4V and 5V. The 4.2k–10k ohm resistor is typically used, but it could be 4.2k, 5.1k, or 10k. It works fine. The Rx resistor is a voltage-regulating component. Initially, you can short it with a wire and then replace it with the correct resistance based on the cutoff voltage.

1. For optimal performance, use a power supply between 4.7V and 12V with constant current. This ensures stability during charging.

2. If you plan to add a thermistor to the thermal port, remove the corresponding resistor to avoid false readings from the MAX1879.

3. Choose the appropriate pad for 3.6V or 4.2V, and make sure to flush the pad for lithium batteries.

Make sure to follow the instructions when connecting the battery. If connected in reverse, the LED will turn blue.

1. For MAX1879, use an input voltage between 5V and 13.2V. Keep the input voltage above 5V throughout the process, as lower voltages may cause the chip to malfunction or reduce the charging current. A 5.2V or higher power supply with at least 2A of current is recommended. Due to voltage drop under high current, many power supplies might not maintain the required 5V, so a higher voltage is advised.

2. For driving MCE or P7 LEDs, the input voltage range is 4.1V to 13.2V, which is compatible with both 2-cell and 3-cell Li batteries.

3. For chargers like MAX1879, the output current range is 0.5A to 3A. While I’ve tested up to 5A, it’s not recommended due to limited testing beyond that point.

4. When driving MCE or P7 LEDs, the output current can go up to 6A (with two units in parallel, for example).

5. The current adjustment interface was set to 1.5A before shipping. If you need a different current, you can remove the current-setting resistor and replace it with another value. (The resistor isn’t soldered on the PCB in the image to show all pads.) You can also use an external potentiometer for adjustment, but it’s not recommended due to reliability issues. Instead, adjust to the desired current and replace the resistor with a fixed one. Since the pad is part of a high-gain amplifier circuit, long wires can cause interference. Below are the common resistance values for typical currents.