My question is specifically regarding LTC4353 :
Product link: http://www.linear.com/product/LTC4353
Datasheet link: http://www.linear.com/docs/41582
Looking at the diagram on the product link, or the first page of the datasheet, I noticed that it is using an N-channel MOSFET, but the current direction is labelled as from Source to Drain.
I'm wondering what is the reasoning behind this implementation? Is it done to make use of the body diode of the MOSFET?
Best Answer
It is an application called ideal diode. When the IC detects that the body diode of the MOSFET is conducting, it turns on the MOSFET to lower the conduction losses and minimize forward voltage. MOSFETs are unipolar devices and they can conduct current both ways.