What is the role of power management unit in a mobile system?

Q. What is the role of power management unit in a mobile system?

Answer :-

This subsystem is responsible for providing power to a mobile system. The mobile systems work on limited power provided through an attached battery unit. This subsystem has a battery management system that works with a battery charger and a battery unit, and provides power to the mobile system in required form.

In other words, it contains a collection of different functions that include battery charging, monitoring and supplying many different voltages these systems require. It also contains software controlled turn-on and turn-off feature to optimize the power consumption and battery life of the whole box.