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Four switch conversion in LM5118

Posted: 31 Oct 2011     Print Version  Bookmark and Share

Keywords:buck-boost controller  two-switch 

National Semiconductor's LM5118 buck-boost controller is a two-switch implementation which means there are two switching MOSFETs and two diodes in the power path. As we know, there are applications where even greater efficiency is required. By replacing the two diodes with MOSFETs, a fully synchronous 4 switch version is realised, with corresponding increase in efficiency and only requires a handful of readably available parts. This is shown in this application note, in its basic form. All of the mode transition capabilities of the LM5118 are preserved in the four switch version.

View the PDF document for more information.

Originally published by National Semiconductor at as "LM5118 Four Switch Conversion".

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