How to Use MT3608: Examples, Pinouts, and Specs

The MT3608 is a high-efficiency step-up (boost) DC-DC converter designed to increase an input voltage to a higher output voltage. It is widely used in applications where a stable, higher voltage is required from a lower voltage source, such as in battery-powered devices. The MT3608 is compact, cost-effective, and highly efficient, making it a popular choice for portable electronics, LED drivers, and charging circuits.

• Powering devices requiring higher voltage from a low-voltage battery source
• LED lighting systems
• Portable electronics
• USB power banks
• Solar-powered devices
• Charging circuits for lithium-ion batteries

The MT3608 is available as a module or as an IC. Below are the key technical details:

1. Connect Input Voltage: Connect the positive terminal of your power source to the VIN pin and the negative terminal to the GND pin.
2. Connect Output Load: Connect the positive terminal of your load to the VOUT pin and the negative terminal to the GND pin.
3. Adjust Output Voltage: Use the onboard potentiometer to adjust the output voltage. Turn clockwise to increase the voltage and counterclockwise to decrease it.
4. Verify Output Voltage: Use a multimeter to measure the output voltage before connecting your load to ensure it matches your requirements.

• Input Voltage: Ensure the input voltage is within the 2V to 24V range.
• Output Voltage: Do not exceed the maximum output voltage of 28V.
• Current Limitations: The maximum output current is 2A, but this depends on the input voltage and load. Exceeding this limit may damage the module.
• Heat Dissipation: At high currents, the module may heat up. Consider adding a heatsink or improving ventilation if necessary.
• Capacitors: Use appropriate input and output capacitors to stabilize the voltage and reduce noise.

The MT3608 can be used to power an Arduino UNO from a low-voltage source, such as a 3.7V lithium-ion battery. Below is an example circuit and code:

1. Connect the battery's positive terminal to the VIN pin of the MT3608 module and the negative terminal to GND.
2. Adjust the MT3608 output voltage to 5V using the potentiometer.
3. Connect the VOUT pin of the MT3608 to the 5V pin of the Arduino UNO and GND to GND.

// Example code to blink an LED using Arduino UNO powered by MT3608
// Ensure the MT3608 output is set to 5V before connecting to Arduino

const int ledPin = 13; // Built-in LED pin on Arduino UNO

void setup() {
  pinMode(ledPin, OUTPUT); // Set LED pin as output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn LED on
  delay(1000);               // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn LED off
  delay(1000);               // Wait for 1 second
}

1. No Output Voltage

   • Cause: Input voltage is too low or not connected properly.
   • Solution: Verify the input voltage is within the 2V to 24V range and check connections.

2. Output Voltage Not Adjustable

   • Cause: Faulty potentiometer or incorrect adjustment.
   • Solution: Turn the potentiometer slowly and ensure it is not damaged.

3. Overheating

   • Cause: Excessive current draw or poor ventilation.
   • Solution: Reduce the load current or add a heatsink to the module.

4. Output Voltage Drops Under Load

   • Cause: Input voltage is insufficient or load exceeds module capacity.
   • Solution: Increase the input voltage or reduce the load current.

1. Can the MT3608 be used to charge batteries?

   • Yes, but ensure the output voltage is set to the appropriate charging voltage for the battery type.

2. What is the maximum efficiency of the MT3608?

   • The MT3608 can achieve up to 93% efficiency under optimal conditions.

3. Can I use the MT3608 to power a Raspberry Pi?

   • Yes, but ensure the output voltage is set to 5V and the current requirements of the Raspberry Pi are met.

4. Is the MT3608 protected against short circuits?

   • No, the MT3608 does not have built-in short-circuit protection. Use external protection if needed.