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How to successfully apply low dropout regulators

Posted: 01 Jun 2010     Print Version  Bookmark and Share

Keywords:low dropout regulators  LDO topology  voltage regulators 

A low dropout (LDO) regulator is capable of maintaining its specified output voltage over a wide range of load currents and input voltages, down to a very small difference between input and output voltages. This difference, known as the dropout voltage or headroom requirement, can be as low as 80mV at 2A. The adjustable output, low dropout regulator first came to public attention in 1977. Current portable devices often require up to 20 low dropout linear regulators.

Many of the LDOs in today's portable devices are integrated into multi-function power management ICs (PMICs), highly integrated systems with many power domains for audio, battery charging, housekeeping, lighting, communications and other functions. This application note reviews the basic LDO topology, explains key specifications, and shows the application of low dropout voltage regulators in systems.

View the PDF document for more information.

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