REG101UA-2.85

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The REG101UA-2.85 linear voltage regulator is part of STMicroelectronics\' extensive range of voltage regulators. This device is a three-terminal fixed-output low-dropout (LDO) voltage regulator, capable of providing an output voltage of 2.85 volts from a wide input voltage range. The device is particularly suitable for applications requiring low dropout voltage at high output current.

This device is designed to provide a low-noise power supply when used with a low output capacitance and a high quality input filter capacitor. It features low quiescent current (150mA maximum) and excellent line and load regulation. It is also capable of providing short circuit protection, thermal overload protection and input reverse polarity protection.

The REG101UA-2.85 is ideal for use in a wide range of applications. One such example is in industrial control, where the regulator is used to power low-voltage logic components such as microcontrollers or digital signal processors. The regulator can also be used in a portable device, where it provides a stable output voltage in the presence of varying environmental conditions and dynamic loading.

The working principle of the REG101UA-2.85 is relatively simple to understand. Its basic circuit consists of an amplifier and a pass transistor. The amplifier compares the output voltage to a reference voltage, and then adjusts the gate voltage of the pass transistor to maintain the desired output voltage.

The pass transistor is operated in a weak inversion region where its output conductance is largely dependent on its gate voltage. This ensures linear regulation of the output voltage even at extremely low input voltages. This type of regulator operates with a very low dropout voltage and excellent line and load regulation.

In summary, the REG101UA-2.85 linear voltage regulator is an excellent choice for low-voltage logic circuits in industrial control and portable applications. It features low dropout voltage and excellent regulation characteristics. The weak inversion region operation of its pass transistor ensures linear regulation of the output voltage even at low input voltages.

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