LDO (Low Drop Out) Voltage Regulators are power management devices that regulate voltage supplied to a system or sub-system, which keeps the voltage at the desired level regardless of varying input voltage from an external power source. LDOs offer a very low quiescent current and wide input voltage range, making them ideal for use in battery powered systems, where long life is required. LDOs also offer excellent line regulation, enabling them to maintain a steady output voltage as the input voltage changes. LDOs do not require any external components, making them very simple and cost-effective to implement. They are also very efficient, with high switch-on currents and low losses. LDO Voltage Regulators are becoming more popular as they provide improved system performance, while being cost-effective and simple to implement.