Russell McMahon wrote:
>
> Peak FET switch current is about double for the 1640.
>
> ...
>
> The 1640 has variants which are not available in the 1623/24 which
> instead of turning off the PFEt in disable mode, turn it hard on. This
> allows the battery to be connected to the output in shutdown. If Vin
> is high enough this is most useful.
>   
I've ordered 3 free samples of the 1640B as I was looking for something 
similar. There is a Linear Technology part I was going to try.

the 1640 seems to come in plain, B, C, D etc, and my understanding is 
you either order an turn off  OR hard on version of FET?
I think I have ordered the version that turns off.

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