LF85CDT

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Linear voltage regulators are a type of electronic components that smoothly maintain a certain output voltage by removing any unexpected input voltage fluctuations. The LF85CDT is a series of low-dropout linear voltage regulators that are suitable for controlling microprocessor-based systems. It is designed to efficiently reduce the input voltage to whatever the system needs, and it can handle up to 3.5A of output current. It is also relatively small in size, making it a great option for applications where space is limited.

The LF85CDT is available in fixed output voltages of 3.0V, 3.3V, and 5.0V. It also has an adjustable output voltage that can be set between 1.235V and 21V using an external resistor divider network. With a low dropout voltage of typically 260mV at full load, it can maintain a low output voltage even at heavy loads. It also includes short-circuit and open-circuit protection to ensure its integrity in the case of input overload.

The LF85CDT is designed to operate with an input voltage that is higher than the regulated output voltage. It works by controlling the current flow between the input and the output, taming any voltage variations on the input side to maintain a predetermined output voltage. This is achieved through the use of a PMOS pass element that, when driven by the internal control circuit, can adjust the current flowing through it to provide a stable output.

The control circuit also features an error amplifier, sensed by an internal 1V reference voltage. Whenever the output voltage deviates from the desired level, the error amplifier reacts, providing feedback information to the PMOS pass element, which in turn adjusts its current accordingly in order to maintain the proper output voltage. This feedback loop ensures a stable output voltage and takes into account any input voltage fluctuations, ensuring the LF85CDT can work reliably in a wide variety of applications.

The LF85CDT is a reliable and power-efficient solution for providing a regulated voltage for applications with a limited mounting area. It offers protection against short circuits, overloads, and open circuits, and its low drop-out voltage makes it suitable for applications under heavy loads. Its integrated control circuitry and adjustable output voltage further expand its usefulness, providing users with a great choice for maintaining a steady and reliable voltage in even the most challenging applications.

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