How to Use TP4056: Examples, Pinouts, and Specs

The TP4056, manufactured by Makers (Part ID: TP4036), is a lithium-ion battery charger IC designed for single-cell lithium-ion batteries. It provides a constant current/constant voltage (CC/CV) charging profile, ensuring safe and efficient charging. The IC integrates features such as thermal regulation, over-voltage protection, and automatic charge termination, making it a reliable choice for battery-powered applications.

• Charging single-cell lithium-ion or lithium-polymer batteries
• Power banks and portable chargers
• Wearable devices and IoT gadgets
• Battery management systems
• DIY electronics projects

The TP4056 is a compact and efficient charging IC with the following key specifications:

The TP4056 IC has 8 pins, each serving a specific function. Below is the pin configuration:

1. Power Supply: Connect a DC power source (e.g., USB 5V) to the VCC pin. Ensure the input voltage is within the range of 4.0V to 8.0V.
2. Battery Connection: Connect the positive terminal of the lithium-ion battery to the BAT pin and the negative terminal to GND.
3. Programming Charging Current: Use a resistor (RPROG) between the PROG pin and GND to set the charging current. The charging current can be calculated using the formula: [ I_{CHG} = \frac{1200}{R_{PROG}} ] For example, a 1.2kΩ resistor sets the charging current to 1A.
4. Temperature Monitoring: Connect an NTC thermistor to the TEMP pin for battery temperature monitoring. If not used, connect TEMP to GND.
5. Status Indicators: Use LEDs with pull-up resistors on the CHRG and STDBY pins to indicate charging status.

• Ensure proper heat dissipation, as the IC may heat up during operation. Use a heat sink or proper PCB layout for thermal management.
• Do not exceed the maximum input voltage of 8.0V to avoid damaging the IC.
• Use a high-quality lithium-ion battery with built-in protection circuitry for safety.
• If using the TP4056 with an Arduino UNO or other microcontroller, ensure the battery voltage is monitored to prevent over-discharge.

The following code demonstrates how to monitor the battery voltage using an Arduino UNO:

// Define the analog pin connected to the battery voltage divider
const int batteryPin = A0;

// Voltage divider resistor values (in ohms)
const float R1 = 10000.0; // Resistor connected to battery positive terminal
const float R2 = 10000.0; // Resistor connected to ground

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int rawValue = analogRead(batteryPin); // Read the analog value
  float voltage = (rawValue / 1023.0) * 5.0; // Convert to voltage (Arduino 5V reference)
  
  // Calculate the actual battery voltage using the voltage divider formula
  float batteryVoltage = voltage * ((R1 + R2) / R2);
  
  Serial.print("Battery Voltage: ");
  Serial.print(batteryVoltage);
  Serial.println(" V");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. IC Overheating

   • Cause: Excessive charging current or insufficient heat dissipation.
   • Solution: Reduce the charging current by increasing the RPROG resistor value. Ensure proper PCB layout for heat dissipation.

2. Battery Not Charging

   • Cause: Incorrect wiring or damaged battery.
   • Solution: Verify all connections. Ensure the battery is functional and within the supported voltage range.

3. Status LEDs Not Working

   • Cause: Missing pull-up resistors or incorrect LED connections.
   • Solution: Add pull-up resistors (e.g., 10kΩ) to the CHRG and STDBY pins. Check LED polarity.

4. Input Voltage Out of Range

   • Cause: Using a power source outside the 4.0V to 8.0V range.
   • Solution: Use a regulated DC power source within the specified range.

Q1: Can the TP4056 charge multiple batteries in series?
A1: No, the TP4056 is designed for single-cell lithium-ion batteries only. Charging multiple cells in series requires a specialized battery management system.

Q2: What happens if the battery temperature exceeds the safe range?
A2: If a thermistor is connected to the TEMP pin, the TP4056 will stop charging when the temperature is outside the safe range.

Q3: Can I use the TP4056 with a solar panel?
A3: Yes, but ensure the solar panel output voltage is within the 4.0V to 8.0V range and use a capacitor to stabilize the input voltage.

Q4: How do I adjust the charging voltage?
A4: The charging voltage is fixed at 4.2V and cannot be adjusted. For other voltages, consider using a different IC.