>Hello,
>    I've seen on the LT1073 datasheet (from www.linear-tech.com or
>www.linear.com) the term "bootstrap". What's this?
>    Regards,
>    Brusque

This is where the LT1073 prints "C:>"  (Snide joke aimed at the
naive who think "booting" means "application prompt".

As for the LT part, look at the diagram and note that the
chip is being powered from its own output!  The 1.5 volt
input is boosted to something a little higher, which is
dumped through the inductor again to raise the voltage
some more until it gets to 5V.  The bootstrap term comes
from the curious idea that you can pick yourself up by
your own boot straps   :)

Barry

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