Low Dropout Regulators (LDOs) are linear voltage regulators designed to provide a stable output voltage from an input voltage that is only slightly higher than the desired output. They regulate and smooth power supplies, helping protect sensitive electronic components from voltage fluctuations.

LDOs are available with features such as fixed or adjustable output voltages, low quiescent current, high power-supply rejection, thermal protection, and short-circuit protection.
Applications

Battery-powered devices
Consumer electronics
Embedded systems
Microcontrollers and processors
Communication equipment
Industrial and automotive electronics
Power management circuits

Key advantages: simple implementation, low noise, compact size, fast transient response, and efficient regulation when the input-to-output voltage difference is small.