USB port or charger detection chip

[Global_Apathy]

Though someone else could make use of this chip too.

http://www.fairchildsemi.com/ds/FA/FAN3988.pdf

you would be able to adjust current based on a decision.

 

[WillyB]

And what use have you made of it?

 

[Global_Apathy]

it would be used for detecting whether you are plugged in to a charger or computer. You could adjust charging current accordingly.