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MOSFET load switch PCB with temp measurement

Posted: 03 Jul 2013 ?? ?Print Version ?Bookmark and Share

Keywords:electronic systems? MOSFETs? DFN2020? DFN3333? SO-8?

Modern electronic systems are made up of separate functional blocks, which can be activated and deactivated independently. Many systems need a specific turn-on and turn-off sequence for a proper system start and shutdown. In order to save energy and to extend battery life time, some blocks can be activated only if necessary. MOSFETs are used as load path switching element in so-called load switch applications to support this function.

In line with the industry trend towards smaller electronic devices like tablet PCs, ultralight PCs and smartphones, MOSFETs in smaller packages are used in the designs. Modern MOSFETs can combine a low turn-on resistance with small space requirements paving the road towards a higher power density, measured in Watts per mm2.

This document describes a demonstration PCB with identical MOSFET crystals in a DFN2020, a DFN3333 and an SO-8 package which can be compared depending on their thermal performance. A sensor measures the temperature of each drain pad. A microcontroller calculates a solder point temperature from this measurement result. Finally this value is displayed on an LCD display.

View the PDF document for more information.

Originally published by NXP Semiconductors at as "MOSFET load switch PCB with thermal measurement".

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