LP2981-33DBVT

LP2981-33DBVT is a linear three-terminal adjustable low dropout regulator with an output voltage range of 1.25 V to 33 V. It is designed with a low quiescent current of only 10 µA max, and provides both over-voltage and over-current protection features. The device also utilizes Intersil’s proprietary Pulse Skipping Technology, which allows for a significantly reduced output voltage ripple.

LP2981-33DBVT is often used in industrial, telecommunication and network systems, as well as point-of-load, embedded and automotive systems.

Working Principle

LP2981-33DBVT works with a voltage reference source that provides a stable reference voltage. The output voltage is adjusted by the resistor divider on the reference or feedback input. The internal regulation circuitry senses the voltage at the feedback input and adjusts the output voltage to maintain a constant ratio in the same way that an op amp would.

The quiescent current in LP2981-33DBVT is kept low because of its low current PNP and NPN transistors, which sink the current while the output remains in regulation. This helps reduce power dissipation and improves efficiency.

The device provides a PGOOD signal output signal, which indicates when the output voltage is in regulation and within a predetermined tolerance of the setpoint. The output voltage will stay in regulation even if the input voltage is adjusted.

LP2981-33DBVT also includes a current limit circuit that monitors the output current and shuts down the output if the current exceeds the limit. This helps protect the device from over-current conditions and allows the device to be used in physically demanding environments.

The integrated logic controlled enable input can be used to disable the device or reduce the output current with a logic signal. This helps reduce power consumption if the output is not needed.

Applications

The LP2981-33DBVT is well suited for a variety of applications, including industrial, telecommunication, network systems, point-of-load, embedded and automotive systems.

It can be used to provide reliable supply voltage to microcontrollers, logic ICs, memory ICs, and other digital circuits, as well as a variety of analog and RF circuits.

The device can also be used to replace standard linear voltage regulators that have bulky heatsinks due to their large quiescent currents.

Conclusion

The LP2981-33DBVT is a high performance three-terminal linear low dropout regulator, which offers both over-voltage and over-current protection. It is also able to provide a stable output voltage even when the input voltage is adjusted, and offers a low quiescent current for improved efficiency and reduced power dissipation.

The device is suitable for a variety of applications, including industrial, telecommunication, and automotive systems, as well as a variety of other systems requiring reliable power supplies.