We are trying to use the CSD25402Q3A as bipolar switch (please see http://cds.linear.com/docs/en/datasheet/4417f.pdf, Fig1, M5, M6).
The input voltage is between 3 and 3.5V, gate drive is solid 0V. The current is between 0 and, say, 4A
It looks like M5 behaves very differently from M6. The combined (two MOSFETs) resistance is between 90 and 250mOhms (depending on input voltage). The lion share (~80-90%) of the voltage drop is across M5 (reverse biased part).
Do you have any information about MOSFET behavior when it is reverse biased?
Thank you.
Michael Kogan