I am trying to build a portable project with some form of RGB LED (probably APA102) and a controller such as a Raspberry Pi. I am trying to figure out what is required to safely power both the LEDs and the controller, but based on my calculations (which are probably incorrect), I am having trouble coming up with a way to do so:
- ~200 APA102 LEDs (which, at most, should be drawing around 60 mA per RGB LED)
- Raspberry Pi (draws at the very most, 500-700 mA)
In total, this comes to ~12,000 mA maximum draw. Now, I am never going to have the Raspberry Pi or LEDs on full blast, so this figure is an absolute maximum. I can pretty easily add in software limits to prevent the LEDs from being completely lit at any one time.
But, even if this drops down to half (6A draw), this is way beyond what a standard AA/AAA battery pack can provide. So, the obvious choice is to use Lithium Ion.
Adafruit has a 6600 mAh battery pack (3 x 2200 mA: http://www.adafruit.com/products/353) with a stated max draw of ~13 A-- perfect for my situation, since I will rarely if ever be at that point. However, the voltage is only 3.7v when I need 5v.
So, then I would need a step up converter, correct? Is there a step up converter that even supports the 13 A peak draw (and probably around 3-4 A constant at very most)? Generally, I've only been able to find 500 mA to 1 A converters in my research.