Analog Devices Inc. LTC333x Nanopower Buck-Boost DC/DC Converters integrate a high voltage energy harvesting power supply. Each device also has a DC/DC converter powered by a primary cell battery to create a single output supply for alternative energy applications. The energy harvesting power supply consists of an integrated full-wave bridge rectifier and a high voltage buck converter. This power supply harvests energy from piezoelectric, solar or magnetic sources. The primary cell input powers a buck-boost converter capable of operation down to 1.8V at its input. Either DC/DC converter can deliver energy to a single output. The buck operates when harvested energy is available, reducing the quiescent current draw on the battery to essentially zero. This feature extends the life of the battery. The buck-boost powers VOUT only when harvested energy goes away.
