How to Use Automatic Buck-Boost Module 3.3V 2A / 5V 1A Output Regulated Power Supply Board TPS63802 Chip Lithium Battery Buck-Boost Control: Examples, Pinouts, and Specs

The Automatic Buck-Boost Module HL802A-3.3V, manufactured by Shenzhen Zheng Yi Electronic Technology Co., Ltd, is a versatile power supply module designed to regulate voltage levels efficiently. It can step down (buck) or step up (boost) input voltages to provide a stable output of either 3.3V at 2A or 5V at 1A. This module is powered by the TPS63802 chip, which ensures high efficiency and reliable performance, even in demanding applications.

• Powering microcontrollers, sensors, and IoT devices from lithium-ion batteries.
• Providing a stable voltage supply for portable electronics.
• Applications requiring seamless transition between buck and boost modes.
• Battery-powered systems where input voltage fluctuates above and below the desired output voltage.

1. Connect the Input Voltage:

   • Attach the input voltage source (e.g., a lithium-ion battery) to the VIN pin.
   • Ensure the input voltage is within the range of 1.8V to 5.5V.

2. Set the Output Voltage:

   • Use the SEL pin to select the desired output voltage:
     • Pull SEL high (connect to VIN) for a 5V output.
     • Pull SEL low (connect to GND) for a 3.3V output.

3. Enable the Module:

   • Pull the EN pin high to enable the module.
   • To disable the output, pull the EN pin low.

4. Connect the Load:

   • Attach the load to the VOUT pin and ensure the current draw does not exceed the module's limits (2A for 3.3V or 1A for 5V).

5. Ground Connections:

   • Connect the GND pin to the ground of the input source and the load.

• Input Voltage Range: Ensure the input voltage remains within the specified range (1.8V to 5.5V) to avoid damage to the module.
• Heat Dissipation: For high current loads, ensure adequate ventilation or heat sinking to prevent overheating.
• Capacitor Placement: Place decoupling capacitors close to the input and output pins to minimize noise and improve stability.
• SEL Pin Configuration: Avoid leaving the SEL pin floating; always connect it to either VIN or GND.

The following example demonstrates how to use the module to power an Arduino UNO with a 5V output.

• Connect the module's VIN pin to a 3.7V lithium-ion battery.
• Connect the VOUT pin to the Arduino UNO's 5V pin.
• Connect the GND pin to the Arduino UNO's GND pin.
• Pull the SEL pin high to set the output voltage to 5V.
• Pull the EN pin high to enable the module.

// Example code to monitor the Arduino's input voltage using the Automatic Buck-Boost Module
// Ensure the module is set to 5V output mode (SEL pin high).

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
  pinMode(A0, INPUT); // Configure analog pin A0 to read input voltage
}

void loop() {
  int sensorValue = analogRead(A0); // Read the analog input
  float voltage = sensorValue * (5.0 / 1023.0); // Convert to voltage (5V reference)
  
  // Print the voltage to the Serial Monitor
  Serial.print("Input Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. Can this module be used with a 9V battery?

   • No, the input voltage range is limited to 1.8V to 5.5V. A 9V battery exceeds this range and may damage the module.

2. What happens if the load exceeds the current limit?

   • The module may enter thermal shutdown or reduce efficiency. Always ensure the load current is within the specified limits.

3. Is the module suitable for powering Raspberry Pi boards?

   • The module can power Raspberry Pi boards that require 5V, but ensure the current demand does not exceed 1A.

4. Can I leave the SEL pin floating?

   • No, the SEL pin must be explicitly connected to either VIN (for 5V) or GND (for 3.3V) to ensure proper operation.

By following this documentation, users can effectively integrate the HL802A-3.3V Automatic Buck-Boost Module into their projects for reliable and efficient power management.