low voltage reverse battery protection

[perts]

I have 3 strings of lithium batteries. 4S3P. I need to protect each string from reverse protection and charging. What is good method to this that has a very low voltage drop, less than 100mV at 2 amps.

I look at schotkey diodes, their forward voltage drop is too high. Using an O-ring controller seems too complicated and too leaky. Any other suggestions?

 

[btrueblood]

Use a FET. See

http://www.ti.com/lit/an/slva139/slva139.pdf

 

[itsmoked]

btrue has a nice app there, used that many times with great results.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[perts]

Thanks for the app note. Would this work if I have 3 strings of 4 cells and each string has a pmos on it with the source of each pmos connected together (diode-or).