LP2981A-50DBVR

LP2981A-50DBVR is a low-dropout (LDO) linear voltage regulator with wide input voltage range. It provides fixed output voltage of 5.0V and is designed to support up to 150mA load. This device is typically used in applications requiring a low quiescent current value and an extended voltage range.

Application Field

LP2981A-50DBVR can be applied to a wide range of applications including portable electronics, battery-powered devices, Personal Digital Assistants (PDAs), mobile phones, tablet PCs, and digital cameras. It can also be used as a regulator for a variety of Li-ion, Li-Po, and other battery-based power supplies. It is specifically designed to provide a high level of accuracy and stability when powering digital processors and mixed-signal integrated circuits that require low noise levels.

The device has features that allow it to supply the operating voltage with a minimum of dropout under varying conditions. This ensures that it will supply the required voltage with minimal supplemental current. The device also has low quiescent current, so it can be used in applications that require minimal power consumption.

The device is designed to be used in parallel configurations to ensure low voltage output and high loading capability. This allows the device to be used in applications that require more current than the device can supply. The device also has a thermal shutdown feature that protects against temperature extremes.

Working Principle

The LP2981A-50DBVR operates on a principle of linear voltage regulation. It utilizes a series pass transistor and a feedback network of resistors and capacitors. The resistors in the feedback network set the output voltage by diverting some of the output current back to the input side. This current is called the feedback current.

The feedback current creates a feedback voltage that opposes the input voltage, resulting in a reduced voltage across the series pass transistor. This causes the transistor to switch on and off, thereby regulating the output voltage. The capacitors help to smooth the output voltage and reduce noise.

The LP2981A-50DBVR utilizes a current limiting feature that helps protect the device from excessive loading. When the load current rises above the set limit, the device will shut off the output and activate the shut-down pin. This prevents the device from being damaged by overloading.

The LP2981A-50DBVR provides improved transient responsecond accuracy, which helps ensure that the output voltage remains within a specified range over a wide range of input voltages. It also has a wide input voltage range and low quiescent current, making it ideal for applications that require low power consumption.