LP2981-28DBVT

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LP2981-28DBVT is a low dropout (LDO) voltage regulator designed to provide a regulated output voltage without requiring line regulation and reduced current consumption. It features an adjustable positive output voltage from 1.25V to 12V with a maximum output current of 200mA and an adjustable negative output voltage range from -7.5V to -12V. This device has a dropout voltage of 130mV, which is much lower than that of a regular low dropout voltage regulator, resulting in a high degree of regulation. In addition, it is protected against overcurrent and overtemperature conditions, making it a reliable and robust solution for factory automation, medical devices, and other applications requiring low voltage, stability, and high current.

The working principle of the LP2981-28DBVT is based on a reference voltage produced from the integrated internal bandgap circuit. This reference voltage is inverted to allow the entire control loop to run at the same polarity in order to balance the loop current. The signal produced from the bandgap circuit then goes through an amplifier, which is set at a fixed gain, to produce the regulated voltage. The output voltage is further regulated by an error amplifier that compares the output voltage to the reference voltage in order to keep the two at the same level. To ensure a stable output voltage, the loop response of the error amplifier is adjusted by means of a capacitor.

The LP2981-28DBVT is a low quiescent current voltage regulator device which is built with high PSRR and low dropout voltage, making it ideal for portable electronics and battery-powered applications. Its quiet operation and high efficiency also allow the device to be used in noise-sensitive applications. It can also be used in applications where the load current is in a low range, such as in consumer electronics and LCD monitors.

In summary, the LP2981-28DBVT is a low dropout voltage regulator that offers a wide range of output voltage options, excellent power saving features, and advanced protection features. Its low quiescent current, low dropout voltage, and high PSRR make it a suitable choice for applications requiring a regulated output voltage. Its adjustable output voltage provides flexibility and a wide range of applications, while its integrated protection features guarantee a safe and reliable operation.

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