LP3891ESX-1.5

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The LP3891ESX-1.5 is a ultra low dropout linear regulator from Texas Instruments (TI). It is specifically designed for mobile applications where its fast transient response, low specified quiescent current and low dropout voltage are important considerations. The LP3891ESX-1.5 is part of TI’s family of low-dropout voltage regulators for portable electronics. It is classified as a PMIC (Power Management IC) voltage regulator and is considered a linear voltage regulator.

The LP3891ESX-1.5 is designed to provide accurate output voltage regulation at inputs down to 1.2 V while dissipating very low quiescent power. The ultralow-dropout regulator provides a well-controlled power-fail warning level at its enable pin, and the internal thermal protection circuitry ensures robust failure mode protection. This linear regulator operates over a temperature range of -40°C to +125°C.

The LP3891ESX-1.5 features an adjustable output voltage from 1.2 V to 5.5 V and can source up to 0.5 A of current with a dropout voltage of only 1.5 V. It contains a high-performance disabled-state ground low-side MOSFET (metal-oxide semiconductor field-effect transistor) and a dropout voltage control loop, both of which contribute to the regulator\'s ultra low quiescent current and low dropout voltage performance. The dropout voltage control loop limits the drain current of internal MOSFET, ensuring low quiescent current over the entire output voltage range. The performance of the LP3891ESX-1.5 enables a significant level of power savings when compared to conventional linear regulators.

The LP3891ESX-1.5 linear regulator can be used in a wide range of applications such as cell phones, PDAs (Personal Data Assistants), portable media players, navigation systems and camera modules. It is also suitable for single-cell Li-ion/Li-polymer battery-powered applications, allowing designers to take advantage of its fast transient response and exceptional battery life characteristics. The device is highly efficient across the entire load range, helping to reduce the amount of power lost during conversion and aid in system power savings.

The LP3891ESX-1.5 is a simple and easy-to-use solution for voltage regulation in portable consumer electronics. The control loop operates by comparing the output voltage with a reference voltage and then amplifying the resulting error signal. This signal is then used to regulate the output voltage by controlling the gate of the internal MOSFET. It also features over-current protection, over-voltage protection and thermal shutdown circuitry to prevent damage to the device.

The LP3891ESX-1.5 is an ideal solution for supporting multiple applications in portable consumer electronics. It offers low dropout voltage, excellent power savings performance and fast transient response, making it well-suited for use in applications where power saving is a priority. Its wide temperature range allows it to be used in a variety of application environments, and its low-cost makes it an attractive solution for a wide range of cost-sensitive applications.

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