LM5574MTX Integrated Circuits (ICs)

Introduction

LM5574MTX is a DC/DC switch mode voltage regulator designed for low voltage applications. It is a cost-effective and integrated power solution, with superior efficiency and a high current output. It is also an ideal choice for providing a steady, regulated source of power for critical systems such as consumer electronics, industrial, and mobile applications.

Features

The LM5574MTX has an input voltage range of 4.5 V to 23 V, and an output voltage range of 0.58 V to 5.5 V. It has a maximum switching frequency of 4 MHz. It has integrated operators with a low on-resistance of 7.2 ohms providing a low quiescent current (Iq) of 1.4mA to minimize power dissipation and maximize efficiency. The device offers under-voltage lockout protection and thermal shutdown protection with boost diodes for enhanced surge protection.

Application Fields

The LM5574MTX is suitable for a variety of DC/DC switching voltage regulator applications. It is widely used in consumer electronics, automotive, industrial applications, and telecommunication circuits. It is appropriate for DC/DC converters in Automotive Battery Monitor Systems and Battery Chargers.Other applications include LED drivers, low voltage DC/DC converters, power rails, power systems, frequency synthesizers, multiple power supply applications, automotive chargers, and battery management systems.

Working Principle

The LM5574MTX uses a synchronous rectified buck converter to regulate its output voltage. It operates in a continuous mode by comparing its internal reference to the output voltage. If the output voltage exceeds the reference, it will switch to a pulse-width modulation (PWM) mode and limit the current flow. If the output voltage is lower than the reference, it will switch to an analog (linear) mode, dependent on the current regulation loop, and pass more current to the load. The pulse-width modulation (PWM) mode sets the duty cycle for the switch mode circuit, and the analog (linear) mode sets the current limit and output voltage. The device will then continuously regulate the output voltage to the desired value.

Conclusion

In conclusion, the LM5574MTX is a DC/DC switch mode voltage regulator designed for low voltage applications. It has an input voltage range of 4.5 V to 23 V, and an output voltage range of 0.58 V to 5.5 V. It offers a low quiescent current (Iq) of 1.4mA and a maximum switching frequency of 4 MHz to minimize power dissipation and maximize efficiency. The LM5574MTX is ideally suited for a variety of applications in consumer electronics, automotive, industrial applications, and telecommunication circuits. It uses a synchronous rectified buck converter to regulate its output voltage and it operates in a continuous mode, setting the duty cycle for the switch mode circuit and the current limit and output voltage in a linear mode.