LP3882EMRX-1.2

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The LP3882EMRX-1.2 (LP3882) is a voltage regulator designed for the Portable Power Applications (PPA) from Texas Instruments. It is a high-efficiency, ultra-low-noise and highly-flexible voltage regulator, part of the TXS family from Texas Instruments. It is specifically designed to provide consistent and reliable performance in a wide range of applications.

LP3882 is a two-terminal linear voltage regulator with a wide input voltage range of 0.9V to 5V, and output voltage range of 0.8V to 5V. It can be used as either a step-up or step-down regulator, and offers high efficiency and low output noise. It has a wide range of capabilities, such as low-dropout voltage, over-current protection, over-temperature protection, and output current limiting. It also includes an adjustable soft-start function, enabling it to precisely set the output voltage.

LP3882\'s primary application field is Portable Power Applications (PPA) such as Smartphones, Laptops, Tablets or Wearables. Its small form factor and high efficiency makes it a perfect choice for on-the-go devices, providing reliable voltage regulation and power saving for long battery life. It is also applicable for many other applications, such as audio amplifiers, small servers, and industrial control systems.

LP3882 has a wide selection of features to satisfy the most demanding applications. It has a high peak output current rating ranging from 2.5A to 10A depending on capacitor selection, and requires few external components, offering smaller footprint and lower cost. Additionally, its EN/FET auto-selection and Self-Bias feature eliminates the need for an external-bias and EN resistor Network, leading to lower noise and improved total system cost.

The working principle of the LP3882 voltage regulator is governed by the following aspects. It consists of a PNP control transistor and a P-channel pass device that maintain a constant output voltage. An external resistor divider provides the feedback voltage, and is used to adjust the output voltage. A current feedback loop ensures a fast transient response and minimizes output voltage deviations. The ripple rejection is a function of the voltage loop bandwidth and is above 90dB for most applications. The internal soft-start feature is used to reduce in-rush current, improving efficiency and stability.

In summary, the LP3882EMRX-1.2 (LP3882) is a low-dropout linear voltage regulator from Texas Instruments designed for Portable Power Applications (PPA). Its high peak output current rating, wide range of features, low noise and high efficiency makes it an ideal choice for powering on-the-go devices. Its working principle relies on a combination of a PNP control transistor, a P-channel pass device, external resistor divider and current feedback loop to provide a highly efficient and reliable voltage regulation solution.

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