How to Use mp2307: Examples, Pinouts, and Specs

The MP2307, manufactured by GK, is a high-efficiency step-down (buck) voltage regulator designed to convert a higher input voltage to a lower output voltage. It is compact, reliable, and widely used in applications requiring efficient power conversion. The MP2307 features a wide input voltage range, adjustable output voltage, and integrated protection mechanisms such as overcurrent and thermal shutdown, making it suitable for a variety of electronic projects.

• Power supply modules for microcontrollers and development boards (e.g., Arduino, Raspberry Pi)
• Battery-powered devices
• LED drivers
• Industrial control systems
• Consumer electronics

1. Input Voltage: Connect the input voltage (4.75V to 23V) to the VIN pin. Ensure the input voltage is within the specified range.
2. Output Voltage Adjustment: Use a resistor divider network connected to the FB pin to set the desired output voltage. The formula for the output voltage is: [ V_{OUT} = 0.92 \times \left(1 + \frac{R1}{R2}\right) ] where ( R1 ) and ( R2 ) are the resistors in the divider.
3. Inductor Selection: Choose an inductor with a suitable current rating (greater than the output current) and low DC resistance for optimal efficiency.
4. Capacitors: Add input and output capacitors to stabilize the circuit. Typical values are:
   • Input capacitor: 10µF to 22µF
   • Output capacitor: 22µF to 47µF
5. Bootstrap Capacitor: Connect a 0.1µF ceramic capacitor between the BST and SW pins.
6. Enable Pin: Pull the EN pin high (above 1.5V) to enable the regulator. Pull it low to disable it.

• Ensure proper heat dissipation by using a PCB with a good thermal design, especially for high-current applications.
• Use low-ESR capacitors for better performance and stability.
• Keep the feedback resistor divider and other sensitive components close to the IC to minimize noise.
• Avoid exceeding the maximum input voltage (23V) or output current (3A) to prevent damage.

The MP2307 can be used to power an Arduino UNO by stepping down a 12V input to 5V. Below is an example circuit and Arduino code to demonstrate its use.

• Connect a 12V power source to the VIN pin of the MP2307.
• Set the output voltage to 5V using a resistor divider (e.g., ( R1 = 6.8k\Omega ), ( R2 = 1.2k\Omega )).
• Connect the output of the MP2307 to the 5V pin of the Arduino UNO.
• Connect the GND pin of the MP2307 to the Arduino GND.

// Example code to blink an LED using Arduino UNO powered by MP2307
// Ensure the MP2307 output is set to 5V before connecting to the 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 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: The EN pin is not pulled high.
   • Solution: Ensure the EN pin is connected to a voltage above 1.5V to enable the regulator.

2. Output Voltage is Incorrect

   • Cause: Incorrect resistor values in the feedback network.
   • Solution: Verify the resistor values and recalculate using the output voltage formula.

3. Overheating

   • Cause: Excessive current draw or poor thermal dissipation.
   • Solution: Ensure the load current does not exceed 3A and improve PCB thermal design.

4. High Output Ripple

   • Cause: Insufficient or poor-quality capacitors.
   • Solution: Use low-ESR capacitors with appropriate values for input and output.

1. Can the MP2307 be used with a 24V input?

   • No, the maximum input voltage is 23V. Exceeding this limit may damage the component.

2. What is the minimum output voltage of the MP2307?

   • The minimum output voltage is 0.92V, which is determined by the internal reference voltage.

3. Can I use the MP2307 without a heatsink?

   • Yes, for low-current applications. However, for higher currents, ensure proper heat dissipation through PCB design.

4. Is the MP2307 suitable for battery-powered devices?

   • Yes, its high efficiency makes it ideal for battery-powered applications.

By following this documentation, you can effectively integrate the MP2307 into your projects for efficient and reliable power conversion.