How to Use TLV62569 3.3V Buck Converter Breakout: Examples, Pinouts, and Specs

The TLV62569 3.3V Buck Converter Breakout (Adafruit Part ID: 4711) is a compact, high-efficiency DC-DC step-down (buck) converter module designed to provide a stable 3.3V output from a higher input voltage. This breakout board is based on the Texas Instruments TLV62569 chip and is ideal for powering low-voltage devices such as microcontrollers, sensors, and other 3.3V logic components.

• Powering 3.3V microcontrollers (e.g., ESP32, Arduino-compatible boards)
• Supplying power to low-voltage sensors and modules
• Battery-powered projects requiring efficient voltage regulation
• General-purpose 3.3V power supply for prototyping and development

The following table outlines the key technical details of the TLV62569 3.3V Buck Converter Breakout:

The breakout board has 5 pins, as described in the table below:

1. Connect the Input Voltage (VIN):

   • Supply a DC voltage between 3.0V and 17.0V to the VIN pin.
   • Ensure the input voltage is within the specified range to avoid damaging the module.

2. Connect the Ground (GND):

   • Connect the GND pin to the ground of your circuit.

3. Connect the Output Voltage (VOUT):

   • Use the VOUT pin to power your 3.3V devices. Ensure the total current draw does not exceed 2A.

4. Enable the Converter (Optional):

   • By default, the EN pin is internally pulled HIGH, enabling the converter.
   • To disable the converter, connect the EN pin to GND.

5. Monitor Power Good (Optional):

   • Use the PG pin to monitor the output voltage status. It outputs HIGH when the output voltage is stable.

• Input Voltage Range: Always ensure the input voltage is within the 3.0V to 17.0V range.
• Heat Dissipation: While the module is highly efficient, ensure adequate ventilation if operating near the maximum load (2A).
• Capacitor Requirements: The breakout board includes onboard capacitors for stable operation. No additional capacitors are typically required.
• Avoid Overloading: Do not exceed the 2A maximum output current to prevent damage to the module.

The TLV62569 3.3V Buck Converter Breakout can be used to power 3.3V sensors or modules in an Arduino UNO project. Below is an example of connecting the breakout to an Arduino UNO and a 3.3V sensor:

1. Connect the VIN pin of the breakout to the 5V pin of the Arduino UNO.
2. Connect the GND pin of the breakout to the GND pin of the Arduino UNO.
3. Connect the VOUT pin of the breakout to the VCC pin of the 3.3V sensor.
4. Connect the GND pin of the sensor to the GND pin of the breakout.

// Example code for reading data from a 3.3V sensor powered by the TLV62569
// Buck Converter Breakout. This example assumes the sensor is connected
// to analog pin A0 of the Arduino UNO.

const int sensorPin = A0; // Analog pin connected to the sensor output

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
  pinMode(sensorPin, INPUT); // Set the sensor pin as an input
}

void loop() {
  int sensorValue = analogRead(sensorPin); // Read the sensor value
  float voltage = sensorValue * (3.3 / 1023.0); // Convert to voltage (3.3V reference)
  
  // Print the sensor value and voltage to the Serial Monitor
  Serial.print("Sensor Value: ");
  Serial.print(sensorValue);
  Serial.print(" | Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  
  delay(1000); // Wait for 1 second before the next reading
}

1. No Output Voltage:

   • Ensure the input voltage is within the 3.0V to 17.0V range.
   • Check that the EN pin is HIGH (or left unconnected, as it is internally pulled HIGH).
   • Verify all connections are secure and correct.

2. Output Voltage is Unstable:

   • Ensure the input power source can supply sufficient current.
   • Check for loose or poor connections in the circuit.
   • Avoid exceeding the maximum output current of 2A.

3. Module Overheating:

   • Ensure the load does not exceed 2A.
   • Provide adequate ventilation or cooling if operating near the maximum load.

4. PG Pin Not Outputting HIGH:

   • Verify that the output voltage is stable and within the expected range.
   • Check the wiring and ensure the PG pin is connected correctly.

Q: Can I use this module to power a 5V device?
A: No, the TLV62569 breakout provides a fixed 3.3V output. For 5V devices, consider using a different buck converter with a 5V output.

Q: Is it safe to leave the EN pin unconnected?
A: Yes, the EN pin is internally pulled HIGH, so the module will operate normally if the pin is left unconnected.

Q: Can I use this module with a LiPo battery?
A: Yes, the module can step down the voltage from a LiPo battery (e.g., 7.4V or 11.1V) to 3.3V, as long as the input voltage is within the 3.0V to 17.0V range.

Q: Do I need additional capacitors for stable operation?
A: No, the breakout board includes onboard capacitors for stable operation. Additional capacitors are not typically required.