LD3980PU08R Integrated Circuits (ICs)

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The LD3980PU08R is a low drop linear voltage regulator typically used where stable 5V output is required from 8V or higher input voltages. It is part of the Linear Fixed Voltage regulators, a class of regulators that offers consistent voltage regulation with a voltage drop between input and output of less than 2V. This makes these regulators ideal for providing power to audio systems, feedback circuitry, and a host of other applications.

Applications

The LD3980PU08R is designed for use with a variety of microcontrollers and other digital circuits. It is best suited for use in applications where a lower drop than 2.8V is needed, such as when powering digital circuits that require 5V for logic level conversion. It can also be used for lower drop-down applications such as providing the 8V required for the cores of some digital ICs. The LD3980PU08R is compatible with 4V-10V input and can be used in mobile device, USB portable devices, and any application that requires a regulated 5V with low dropout.

Working Principle

The LD3980PU08R is a linear regulator that uses a series of FETs, either P-Channel or N-Channel, in combination with a pass element to regulate the voltage output. The number of FETs used in a linear regulator depends on the input and output voltages. The FETs are connected in series, between the input terminal and the ground. When a signal is applied to the control pin, current flows through one of the FETs controlling the voltage line, which turns on and off depending on the signal applied. It is this series of alternating currents that regulate the voltage output.

The working principle behind the linear regulators also involves using a feedback loop. This is done using an error amplifier, which compares the output voltage from the regulator to its reference voltage. If the output voltage is lower than the reference voltage, the amplifier increases its output. This increases the current through the P-FETs and reduces the output voltage, and vice versa.

Linear regulators are usually used for providing power to digital systems, and for powering other systems requiring a constant voltage. The LD3980PU08R is well suited for these applications as its output voltage remains constant over a large range of input voltage. It also has a minimum load current of 1mA and a maximum output voltage of 5.5V.

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