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 small power supply circuits.

• Powering microcontrollers and sensors from a single-cell battery
• LED lighting systems
• Portable power banks
• Charging circuits for devices requiring higher voltage
• DIY electronics projects requiring voltage conversion

The MT3608 is available as an integrated circuit (IC) or as a pre-assembled module. Below are its key technical details:

The MT3608 module typically has the following pins:

1. Connect the Input Voltage (VIN):

   • Attach the positive terminal of your power source (e.g., battery) to the VIN pin.
   • Connect the negative terminal to the GND pin.

2. Set the Output Voltage (VOUT):

   • For the module version, adjust the onboard potentiometer to set the desired output voltage.
   • Use a multimeter to measure the output voltage while adjusting the potentiometer.

3. Connect the Load:

   • Attach the positive terminal of your load to the VOUT pin.
   • Connect the negative terminal of your load to the GND pin.

4. Enable the Converter (if applicable):

   • For the IC version, ensure the EN pin is pulled high to enable the converter.
   • If unused, the EN pin can be tied to VIN.

• Input Voltage Range: Ensure the input voltage is within the specified range (2V to 24V). Exceeding this range may damage the component.
• Output Voltage Limit: Do not exceed the maximum output voltage of 28V.
• Current Limitations: The maximum output current depends on the input voltage, output voltage, and efficiency. Avoid overloading the module.
• Heat Dissipation: At high currents, the MT3608 may generate heat. Use proper heat management techniques, such as adding a heatsink or ensuring adequate ventilation.

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

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

int ledPin = 13; // Pin connected to the onboard LED

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

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);                // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the 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: Ensure the potentiometer is functional and adjust it slowly while monitoring the output voltage.

3. Overheating:

   • Cause: Excessive current draw or poor ventilation.
   • Solution: Reduce the load current or improve heat dissipation.

4. Output Voltage Drops Under Load:

   • Cause: Input power source cannot supply enough current.
   • Solution: Use a power source with sufficient current capacity.

Q: Can the MT3608 be used to power a Raspberry Pi?
A: Yes, but ensure the output voltage is set to 5V and the current demand of the Raspberry Pi does not exceed the MT3608's capacity.

Q: How do I calculate the output current?
A: The output current depends on the input voltage, output voltage, and efficiency. Use the formula:
[ I_{out} = I_{in} \times \frac{V_{in}}{V_{out}} \times \text{Efficiency} ]
Ensure the input current does not exceed the source's capacity.

Q: Can I use the MT3608 with a solar panel?
A: Yes, as long as the solar panel's output voltage is within the MT3608's input range and provides sufficient current.