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These scredrivers may draw ≈6Amps from 3.6V battery, so you have to build a switching voltage regulator rated for that current ..
Try something like LM2678-ADJ .. **broken link removed**
The attached picture is in the link I provided in the previous post .. also, in this PDF file you will find full description of this IC and component selection ..
In case it is hard for you to make a switching power supply yourself, so consider an analog one, just use a LM317 and a power transistor. Circuit and explanation you can get from LM317 datasheet from National semiconductor website, datasheet from this manufacturer contains full set of applications.
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