LP3891EMRX-1.2

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LP3891EMRX-1.2 is a low dropout linear voltage regulator. It is designed to provide and maintain accurate and stable output voltages. This versatile device is ideal for a wide range of applications including microprocessor/micro-controller voltage regulation, power supplies, and low-voltage DC-DC converters. The LP3891EMRX-1.2, when operated in its standby mode, is capable of supplying microprocessors and micro-controllers with low-dropout voltages without degrading the system\'s performance.

The device comes in an 8-pin micro-DFN package, with 1.2V-5.5V input voltage range, and 0.8V to 5.5V adjustable output voltage range. It also features short-circuit protection , thermal shutdown protection, reverse current protection, and ESD protection.

The device uses a wide input voltage range from 1.2V to 5.5V, allowing it to be used in a variety of applications. Due to its low dropout voltage, it is particularly suited for low-voltage applications where output stability is critical. The device is capable of providing optimised thermal dissipation, allowing it to operate at higher temperatures without compromising performance. The device also offers a wide operating temperature range of -40℃ to 85℃.

The LP3891EMRX-1.2\'s working principle is based on a PNP pass-transistor, which is controlled by an internal error amplifier. The error amplifier monitors the output voltage and determines whether the PNP pass-transistor needs to be open, closed, or a combination of both, to maintain the output voltage. This operation provides the correct output voltage, even when the input voltage values fluctuate or decrease. The internal error amplifier, in conjunction with the PNP transistor, also provides fast transient response to input voltage variations.

The LP3891EMRX-1.2 is optimized for low- noise performance, with a low dropout (LDO) voltage of 120mV at a full load of 120mA. The device also features low quiescent current of only 8uA, minimizing the amount of power consumed. It can also operate over a wide range of temperatures from -40C to 85C. The LP3891EMRX-1.2 is fully protected against reverse battery , over-voltage, and current limiting conditions, as well as thermal shutdown.

Overall, the LP3891EMRX-1.2 is an ideal voltage regulator for applications requiring low dropout, low noise performance and ease of implementation. Its small package size, low operating current, stable output, and wide temperature range make it a good choice for portable electronics, industrial power supplies and other battery-operated products. Its low dropout voltage and low quiescent current make it an ideal choice for applications where space is at a premium and high power efficiency is required.

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