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 hobbyists and professionals alike.

• Powering LEDs, sensors, and microcontrollers from low-voltage batteries
• Portable electronics and battery-powered devices
• Solar-powered systems
• DIY electronics projects requiring voltage conversion

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

• Input Voltage Range: 2V to 24V
• Output Voltage Range: 2V to 28V (adjustable via a potentiometer on the module)
• Maximum Output Current: 2A (depending on input voltage and load conditions)
• Efficiency: Up to 93%
• Switching Frequency: 1.2 MHz
• Quiescent Current: 20 µA (typical)
• Operating Temperature: -40°C to +85°C

The MT3608 IC has 6 pins, as described in the table below:

The MT3608 module typically has 4 pins:

1. Connect the Input Voltage:
   • Connect the positive terminal of your power source to the VIN pin.
   • Connect the negative terminal of your power source to the GND pin.
2. Connect the Output Voltage:
   • Connect the VOUT pin to the positive terminal of your load.
   • Connect the GND pin to the negative terminal of your load.
3. Adjust the Output Voltage:
   • Use the onboard potentiometer (on the module) to adjust the output voltage.
   • Turn the potentiometer clockwise to increase the output voltage and counterclockwise to decrease it.
4. Enable the Module:
   • Ensure the EN pin is connected to a high logic level (or left floating, as it is internally pulled up).

• Input Voltage: Ensure the input voltage is within the 2V to 24V range.
• Output Voltage: Do not exceed the maximum output voltage of 28V.
• Load Current: The maximum output current is 2A, but this depends on the input voltage and load conditions. Exceeding this limit may damage the module.
• Heat Dissipation: For high current loads, ensure proper heat dissipation to prevent overheating.
• 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 battery. Below is an example circuit and code:

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

// Example code to blink an LED using Arduino UNO powered by MT3608

const 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:

   • Ensure the input voltage is within the specified range (2V to 24V).
   • Check the EN pin. It should be high or left floating to enable the module.
   • Verify all connections are secure and correct.

2. Output Voltage is Incorrect:

   • Adjust the potentiometer to set the desired output voltage.
   • Ensure the feedback resistor network (if using the standalone IC) is configured correctly.

3. Overheating:

   • Check if the load current exceeds the module's maximum rating (2A).
   • Ensure proper heat dissipation, such as adding a heatsink or improving airflow.

4. Noise or Voltage Instability:

   • Add appropriate input and output capacitors to stabilize the voltage.
   • Ensure the inductor and capacitors meet the recommended specifications.

Q1: Can the MT3608 step down voltage?
No, the MT3608 is a step-up (boost) converter and cannot step down voltage. For step-down applications, use a buck converter.

Q2: What is the efficiency of the MT3608?
The MT3608 has an efficiency of up to 93%, depending on the input voltage, output voltage, and load conditions.

Q3: Can I use the MT3608 to power a Raspberry Pi?
While the MT3608 can provide 5V output, it may not supply sufficient current for a Raspberry Pi under heavy load. Use a more robust power supply for such applications.

Q4: How do I calculate the output voltage?
For the standalone IC, the output voltage is determined by the feedback resistor network connected to the FB pin. Use the formula:
[ V_{OUT} = V_{REF} \times \left(1 + \frac{R1}{R2}\right) ]
where ( V_{REF} ) is typically 0.6V.