REG102UA-2.8

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Introduction to REG102UA-2.8

The REG102UA-2.8 is a low-dropout linear voltage regulator from Diodes Incorporated’s portfolio of power management IC products. This voltage regulator is designed for battery-operated systems, providing an adjustable output voltage ranging from 2.8V to 36V with very low dropout of 0.38V typically at 1A output current. Its low quiescent current of typically 10 μA and shutdown current of typically 0.1 μA make the IC suitable for battery-operated equipment as it saves critical battery life. Other features include over-temperature protection, current limit protection, over voltage protection and reverse current protection.

REG102UA-2.8 Application Fields and Working Principle

The REG102UA-2.8 can be used in a wide range of applications including modems and other industrial grade equipment, cellular phones, datacom and telecom equipment and automotive devices. Its low dropout characteristics makes it well suited for use in applications such as those in which the input voltage is much higher than that of the output voltage. It can also be used in applications in which very low quiescent and shutdown current is necessary such as where a battery supplies the power to the system.

REG102UA-2.8 is a three-terminal voltage regulator which operates in linear mode. The input voltage is applied to the input pin (Vin) and a regulated output voltage is generated at the output pin (Vout) based on the input voltage. The output voltage is externally adjustable via an external resistor. This voltage regulator works by allowing the input voltage to pass through a series transistor and current source connected to the output pin. The voltage drop across the series transistor is adjusted to provide a stable output voltage. The output voltage is also regulated against load, line and temperature variations by further controlling the current through the current source and series transistor.

The REG102UA-2.8 is designed to provide protection from excessive input voltages or output shorts. When the current drawn from the output terminal exceeds the rated current, the IC will shut down to prevent overloading the series connection. An over voltage protection circuit is also incorporated to prevent the output voltage from exceeding the rated value. The IC has a reverse-current protection circuit that is enabled when an excessive reverse voltage is applied, protecting the IC and the system.

Conclusion

The REG102UA-2.8 is a low-dropout linear voltage regulator with a wide range of applications in battery powered devices and systems. It features a low dropout voltage of 0.38V typically at 1A output current and a very low quiescent current of 10 μA typically and shutdown current of typically 0.1 μA, making it ideal for use in battery operated equipment. The REG102UA-2.8 also provides protection from excessive input voltages, output shorts and reverse currents. Thus, the REG102UA-2.8 is an ideal solution for low-power circuits that require an adjustable output voltage.

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