OOOOK.... Did this picture come directly from the data sheet of the MAX668 IC?
There are many IC's from many different manufacturers which provide equivalent boost converter functionality, and yet cost even less. AND a lot of them have integrated power switches as well, thus reducing the external component count.....
Do you have a particular need for a circuit like this and you are looking for other recommendations? Or is this post directed as an answer to some other question which was asked???
I don't get it.