Good day freaks,
I've got another general electronics question. So I've got this 11.1 volt, 3-cell Lithium Polymer battery:
I've used it to power some of my AVR and ARM boards, some are 3.3 volts and some are 5.0 volts. Each of these are using regulators that have a maximum input voltage of +15 volts.
With one specific board (my ATSAM dev. board I built recently), I've had problems with the power regulator shorting the output pin with the input voltage. With this specific board, I've been testing a 2.8 inch full color TFT LCD. So it draws significantly more current than some of my simpler boards.
I've noticed if I power the board with my Li-Po, the regulator will get extremely hot. If I power the board with a 9-volt battery, the regulator seems to be fine. Unfortunately, the specific 9-volt batteries I've used (non-rechargeable) doesn't last very long and discharges very quickly. I am using the required input and output capacitance for the voltage regulator and the CPU on my dev. board. I've got a 4.5 volt three AA battery pack that I can test with but I'll have to pick up some more AA batteries tomorrow.
So short question with a long explanation. But is this Li-Po too much or not stable enough for powering these low voltage, low current devices?