L4995AJTR Integrated Circuits (ICs)

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L4995AJTR is a linear voltage regulator by STMicroelectronics, part of the L49x5A series of low dropout (LDO) regulators. It offers a wide range of voltages and current ranges, making it suitable for a wide range of applications. This article will discuss the application field and working principle of the L4995AJTR.

Application Field of L4995AJTR

The L4995AJTR is a popular choice for industrial, automotive and consumer electronics applications. Its low dropout voltage of only 1.5V and low quiescent current make it suitable for various power supply architectures including battery-operated systems. Its flexibility in output voltage ranges from 0.775V to 13.5V, with output current up to 1.5A makes it suitable for powering a variety of low power to moderately high power components. In addition, its thermal overload and short-circuit protection make it a highly reliable choice.

The L4995AJTR can also be used in other applications where input/output voltage and current requirements vary but is still not suitable for high current and high voltage applications. Applications include power sequencing, sequencing of multiple voltage rails, on/off switching, and hot swapping. The L4995AJTR is a popular choice for signal conditioning in systems measuring temperatures, pressure and other data.

Given its wide voltage range and its ability to handle short circuit and thermal overload conditions, the L4995AJTR is an excellent choice for reliability and cost efficiency. It is a great choice for performing power system functions in power sensitive and cost constrained applications.

Working Principle of L4995AJTR

The L4995AJTR is a linear voltage regulator. It works using a voltage reference, a series pass transistor and a feedback circuit. The voltage reference provides a reference voltage to the series pass transistor, which will be the output voltage for the regulator. The series pass transistor is then connected to the output and feedback pin on the device.

The feedback circuit is used to compare the output voltage to the reference voltage. If the two voltages differ, the feedback circuit will adjust the reference voltage until they match. This way, the regulator can maintain a constant output voltage no matter what the input voltage is. If the input voltage drops below the reference voltage, the pass transistor will provide the output voltage at a slightly lower value.

The L4995AJTR also features a current limit circuit which limits the amount of current that can flow through the device. This prevents the transistor from drawing excessive amounts of current and helps protect against overvoltage. The L4995AJTR can also shut off when the current limit is exceeded.

The L4995AJTR also has an integrated thermal overload protection circuit which helps protect the device from thermal damage. This circuit monitors the temperature of the device and will turn off the device if the temperature reaches an unsafe level.

In conclusion, the L4995AJTR is a linear voltage regulator with a wide range of voltages and current ranges, making it suitable for a wide variety of applications. It features short circuit and thermal overload protection, a current limit circuit, and an integrated thermal overload protection circuit. Its low dropout voltage, low quiescent current and flexibility make it an ideal choice for power supply architectures including battery-operated systems.

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