LP2981A-28DBVRG4

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

LP2981A-28DBVRG4 Application Field and Working Principle

LP2981A-28DBVRG4 application is within the PMIC - Voltage Regulators - Linear category and it is an adjustable low dropout linear regulator with an output voltage adjustable up to 28V. It provides an adjustable regulated output voltage from 1.25 to 28 volts. This adjustable linear regulator integrates a Reference, Error Amplifier, series Pass Transistor, and current limit ideal diode. With very low input current requirements, this device achieves very high power supply design in extremely small size.

The LP2981A-28DBVRG4 allows accurate point-of-load regulation with an operating current of only 3.5µA, it provides fast transient response, low output noise and low quiescent current. This device is ideal for powering a wide variety of loads including modern processors, digital and analogue amplifiers, RF power amplifiers and other high current loads.

The LP2981A-28DBVRG4 has very simple analog architecture which combines low power sequential regulation and high power linear regulation for excellent device efficiency, high accuracy and quick response to load transients. The basic architecture of the voltage regulator consists of four main sections – Reference, Error Amplifier, Series Pass Transistor and Current Limiting Ideal Diode.

The Reference part of the design specifies the desired output voltage of the regulator. The reference output is then fed to the Error Amplifier. The error amplifier is a differential amplifier which compares the regulator output voltage to the Reference voltage. It then produces an output voltage proportional to the difference between the input and Reference voltage. This voltage is then fed to the Series Pass Transistor, which acts as the main switch through which the output current is regulated.

The current limit ideal diode ensures that the regulator is not exposed to excessive output currents, thereby preventing permanent damage to the device. The device also has an enable/disable control pin which allows the system designer to effectively turn off the regulator when not required.

LP2981A-28DBVRG4 is an adjustable linear regulator optimized for battery powered systems such as modern hand-held and wearable devices. Its low quiescent current and low dropout voltage makes it an ideal choice for modern applications where size, power, and efficiency are at the premium. It easily integrates with existing system power bus architectures and offers fast transient response and high line/load regulation with low output noise. Its flexible output voltage range, adjustable from 1.25 to 28 Volts, and fast enable/disable control makes it suitable for a variety of applications such as systems requiring multiple output voltages, dynamic voltage allocation for power gating, or for adding region specific output voltage adjustment.

The specific data is subject to PDF, and the above content is for reference