LM2574N-ADJ

The LM2574N-ADJ is a monolithic integrated circuit which is specifically designed to offer improved performance and cost reduction. It is a adjustable step-down switching regulator with a wide input voltage range, which features low operational current, fast current limit, and both line and load regulation. The LM2574N-ADJ can be used as anything from a simple switch and diode replacement to a complex current-regulated system. It offers the user a wide selection of features, such as: adjustable output voltage, auto-switching, separate-wind power and peak current-limit protection, and internal compensation.

Features of LM2574N-ADJ Regulator

• Wide input voltage range (5.5 to 40V)
• Adjustable output voltage range (1.23 to 37V)
• Maximum output current of 3A with 10% duty cycle operation
• Auto-switching with integrated power MOSFETs
• Peak current-limit protection and separate-wind power
• Internal compensation network with thermal shutdown
• Low quiescent current
• Surface mount package for easy PCB assembly

Applications of LM2574N-ADJ

The LM2574N-ADJ regulator is primarily used in applications requiring adjustable or step-down regulation functions. Commonly used applications include: DC-DC converters, battery-powered systems, motor control, lighting and power management systems, etc. Also, the device is ideal for those applications requiring low input voltage and a stable output voltage.

Working principle of LM2574N-ADJ

In a nutshell, the LM2574N-ADJ is a high efficiency, step-down switching regulator which uses a switching topology. When powered, the LM2574N-ADJ measures the input voltage and compares it to the desired output voltage. If the input voltage is higher than the desired output voltage, the regulator switches the connected MOSFETs in a timely fashion, to maintain a stable output voltage. The output voltage is adjustable by controlling the duty cycle via an external resistor, which adjusts the switching frequency. The LM2574N-ADJ usually works with a minimum duty cycle of 10%, to provide peak current-limit protection.

In addition to its adjustable output voltage function, the LM2574N-ADJ also provides peak current-limit protection and over-temperature protection, which are designed to protect the circuit from dangerous current or thermal overloads. The incorporated MOSFETs also allow for higher efficiency when the device is used with higher input voltages and lower output voltages. Finally, the device is also designed with a low current consumption, and minimal quiescent current, which allows it to be used in battery powered applications as well.

Conclusion

In conclusion, the LM2574N-ADJ is a highly efficient monolithic step-down switching regulator and provides adjustable output voltage, peak current-limit protection, and thermal over-temperature protection. It is suitable for a wide variety of applications and is especially suitable for applications requiring low input voltage and stable output voltage. In addition, its low quiescent current and low operational current at higher voltage make it ideal for battery-powered applications.