LM25018SDX/NOPB

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LM25018SDX/NOPB Application Field and Working Principle

The LM25018SDX/NOPB voltage regulator from Texas Instruments is a synchronous step-down DC-DC regulator, part of their wide range of PMIC (Power Management IC) solutions. It is designed to provide power efficiency, small size and up to 5A of output current with current limiting and thermal shutdown.

The device is targeted at a variety of applications such as smartphones and tablets, laptops, and servers. Its qualities provide the advantages of both synchronous and linear regulators for a wide range of design needs and applications. This device can provide up to 96% efficiency over much wider current ranges than linear regulators and will allow for better power consumption and longer battery life.

LM25018SDX/NOPB Features

• Input voltage range from 4.5V to 32V, maximum output is 20V.
• Suitable for voltage pre-regulated applications and can also be used in buck topology.
• Uses synchronous rectification and adjustable current limit control.
• Allows for the use of small inductors, which reduces the size, improves efficiency, and lowers cost.
• Input and output are short-circuit protected and the device is immune to double-pulsing.
• Incorporates an internal cascode switch to extend the output voltage range beyond the output voltage rating.
• Integrates an optimal slew rate control system.

LM25018SDX/NOPB Working Principle

The LM25018SDX/NOPB is a synchronous step-down voltage regulator which works by first drawing current from the input and then regulating the output voltage by consuming control current. This current is then combined with the input current to form a "buck" type current waveform. By regulating the output voltage, the LM25018SDX/NOPB is able to maintain constant voltage and current at the output.

The device features an adjustable current limit control that allows current limiting in the flex mode, thus protecting sensitive components from excessive current. The internal cascode switch allows for operation in the buck topology, while the synchronous rectification allows for higher efficiency than linear regulators.

The device also features an optimal slew rate control system which helps to minimize any inrush current by keeping the output voltage within the specified range. This feature is also beneficial in applications which require minimal ripple. The device is designed to reduce the amount of stored energy and power dissipation to a minimum, which makes it more suited for energy efficient applications.

LM25018SDX/NOPB Applications

The LM25018SDX/NOPB is primarily aimed at voltage pre-regulated systems, such as in smartphones and tablets, laptops, server systems and other wireless applications. It can be used as a main regulator or an auxiliary regulator, in order to reduce the ripple or provide load current sharing. The device is suitable for automotive and industrial applications due to its extended temperature range and low operating voltage.

The LM25018SDX/NOPB is also well suited for applications which require constant and smooth output current, such as LED lighting and other low power lighting systems. It is also suitable for applications which require fast current limit response times and high efficiency, such as solar powered energy systems.

Conclusion

The LM25018SDX/NOPB voltage regulator is a power management solution designed to provide high efficiency, small size, and current limiting and thermal shutdown. It is suitable for voltage pre-regulated systems, energy efficient applications, automotive and industrial applications and low power lighting systems. The device is also immune to double-pulsing, allows for operation in the buck topology, and features an optimal slew rate control system. It is a versatile PMIC solution which is suitable for a wide range of design needs.

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