TPS27S100: About the recommend diode for reverse current ...

Hi Kengo,

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By reverse current protection at Vin, do you mean a diode from Vin to the device?

TI does not spec this protection diode as it heavily depends on the system that your customer is running. In this case, all the application current will flow through the diode causing it to heat up. Sufficient heat sinking should also be used.

I suggest using a high current rated shottkey diode with the smallest forward voltage drop. It is also possible to use an "ideal diode" device like LM and get a very small voltage drop.

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A Schottky diode is still going to drop 3V or more, and at 6 amps it will get warm.  A better choice is a mosfet mounted in reverse orientation, which will drop almost no voltage at all.  Here's an excellent video on this option:

Edit: I meant 0.3V of course.



I should add that while you typically see this on the high side with a P-channel mosfet, you can do exactly the same thing on the low side with an N-channel mosfet, and N-channels typically have lower on-resistance than P-channels.  However, the low-side option can be the wrong choice if you have other devices on other supplies sharing a common ground.

Edit:  I should have mentioned that the mosfet is likely to be smaller and cheaper than a 6A Schottky diode.

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