How to Use IRLZ44N: Examples, Pinouts, and Specs

The IRLZ44N is an N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) manufactured by Infineon. It is designed for high-speed switching applications and features a low on-resistance, enabling it to handle high currents efficiently. This makes it ideal for use in power management, motor control, and other high-current electronic circuits.

• DC motor control in robotics and automation
• Power switching in power supplies and converters
• LED dimming and control circuits
• Battery management systems
• High-speed switching in logic-level circuits

The IRLZ44N is available in a TO-220 package with three pins. The pin configuration is as follows:

1. Power Supply: Ensure the drain-source voltage (V_DS) does not exceed 55V and the gate-source voltage (V_GS) stays within ±16V.
2. Gate Drive: The IRLZ44N is a logic-level MOSFET, meaning it can be driven directly by microcontrollers like the Arduino UNO. Apply a gate voltage of at least 5V for optimal performance.
3. Load Connection: Connect the load (e.g., motor, LED, or resistor) between the drain and the positive supply voltage. The source is typically connected to ground.
4. Gate Resistor: Use a resistor (e.g., 220Ω to 1kΩ) between the microcontroller pin and the gate to limit inrush current and protect the microcontroller.
5. Flyback Diode: For inductive loads (e.g., motors or relays), connect a flyback diode across the load to protect the MOSFET from voltage spikes.

Below is an example of using the IRLZ44N to control a DC motor with an Arduino UNO:

• Gate: Connect to Arduino digital pin (e.g., D9) through a 220Ω resistor.
• Drain: Connect to one terminal of the motor.
• Source: Connect to ground.
• Motor: Connect the other terminal to the positive supply voltage.
• Flyback Diode: Place a diode (e.g., 1N4007) across the motor terminals, with the cathode connected to the positive supply.

// Example code to control a DC motor using IRLZ44N and Arduino UNO

const int motorPin = 9; // Pin connected to the MOSFET gate

void setup() {
  pinMode(motorPin, OUTPUT); // Set motorPin as an output
}

void loop() {
  analogWrite(motorPin, 128); // Set motor speed (0-255, 128 = ~50% duty cycle)
  delay(2000);               // Run motor for 2 seconds

  analogWrite(motorPin, 0);  // Turn off motor
  delay(2000);               // Wait for 2 seconds
}

• Heat Dissipation: At high currents, the MOSFET may generate significant heat. Use a heatsink to prevent overheating.
• Gate Voltage: Ensure the gate voltage is sufficient to fully turn on the MOSFET (logic-level operation requires at least 5V).
• Current Rating: Do not exceed the maximum continuous drain current (47A) to avoid damaging the MOSFET.

1. Can the IRLZ44N be used with 3.3V logic?

   • Yes, but performance may be suboptimal. A gate voltage of 5V or higher is recommended for full switching.

2. What is the maximum PWM frequency for the IRLZ44N?

   • The IRLZ44N can handle PWM frequencies up to several kHz, depending on the gate drive strength and load characteristics.

3. Do I need a heatsink for low-current applications?

   • No, a heatsink is typically unnecessary for currents below 10A, as the MOSFET's on-resistance is very low.

4. Can I use the IRLZ44N for AC loads?

   • No, the IRLZ44N is designed for DC applications only. For AC loads, consider using a TRIAC or other suitable component.

By following this documentation, you can effectively integrate the IRLZ44N into your electronic projects for reliable and efficient performance.