L4940D2T5

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Introduction

The L4940D2T5 is a low dropout (LDO) linear voltage regulator intended for use in a wide range of applications. It provides a reliable and cost effective, fixed output voltage and tight line and load regulation from an input voltage of 2.5V to 24V. This regulator can also be used in fixed voltage applications, such as when building a supply for an LED lamp. The device also includes an integrated thermal diode protection feature that limits the device junction temperature and prevents malfunction of the device.

Applications

The L4940D2T5 is designed for use in a wide range of application areas, such as automotive, consumer, industrial and communications applications. With their small form-factor, low input voltage and current requirements, the device is well suited for portable and battery-powered applications. Industrial applications can benefit from the robustness of the device, as well as its wide input voltage range, high output accuracy, and low ground current.

In automotive applications, the L4940D2T5 provides superior transient response and an adjustable current limit. This can be used to protect the battery and other sensitive components from excessive current. The current limit can be easily set with an external resistor, or for simpler designs, the max sourced current can be set when programming the device.

The L4940D2T5 is also well suited for consumer applications such as gaming devices, set-top boxes, digital media devices and consumer electronics. With its wide input voltage and current requirements, it can easily handle the wide range of voltages often present in consumer electronics.

For communication systems and applications, such as satellite radios, radios, or cellular phones, the L4940D2T5 provides an efficient, adjustable current limit and low noise output. This feature helps reduce power consumption in communication systems.

In addition to these application areas, the L4940D2T5 is also suited for a wide range of other applications, such as portable media players, medical equipment, portable test and measurement systems, residential battery-powered systems, smart meters, and more.

Working principle

The L4940D2T5 is a low dropout (LDO) linear voltage regulator. It works by using an internal linear regulator to reduce an input voltage to the regulated output voltage. The output voltage is regulated by a feedback loop, which consists of a voltage reference and a control amplifier. The voltage reference determines the target output voltage, and the control amplifier adjusts the internal linear regulator to maintain the output voltage at the target level.

The internal linear regulator works by diverting some of the input current to ground, thus lowering the voltage at the output. The amount of current diverted is proportional to the amount of voltage difference between the input and the output. As the difference decreases, the amount of current diverted decreases, resulting in a regulation of the output voltage. Because some of the current is diverted to ground, the output voltage can never be higher than the input voltage.

The L4940D2T5 is designed with a low quiescent current to ensure efficient operation. This is especially important in battery-operated applications, as the device must be able to maintain the output voltage over the entire battery life. The device also has low output noise and high ripple rejection, making it an ideal choice for noise-sensitive applications.

In addition to the linear regulator, the device also includes integrated thermal diode protection. This feature prevents the device from overheating by limiting the power dissipated in the device. When the device junction temperature reaches a certain limit, the thermal diode triggers and shuts down the device, thus protecting it from damage.

The L4940D2T5 is the perfect choice for any application requiring low noise, low quiescent current, and accurate output voltage regulation. With its wide input voltage range, low current requirements, and integrated thermal diode protection, it is a reliable and cost effective solution for a variety of applications.

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