5V to 12V with 750mAh

I have a battery backup system with 6V SLA(lead acid) battery,
But few ckts work on 12V which are used rarely. but they are important.
so how do i get it.

I know I need step-up DC-DC converter
I will be glad to know the chips and links to their datasheets.

I have gone through

h**p://www.electronics-lab.com/projects/power/030/

but i need more

Depending on your Output Current, Here is one Circuit on my website.

**broken link removed**

There is Also a TL1371, which will produce Twice that current.
Not yet shown on my site.

There are also Many other such devices available.

I have found some maxim IC to do my job
MAX608
MAX771
MAX772
MAX1771
I will view the datasheet of yours IC too