I built several LED bar graphs to display the voltage of each LiFePO4 cell in a series of 8. It is critical that the voltage does not drop below 2.5V for these batteries. The thread for that project is http://forum.allaboutcircuits.com/showthread.php?t=34266&highlight=lm3914.
I was going to use a common 12V power supply for each display but I just realized that won't work since all the grounds have to be common and with the cells all in series it would short out the batteries.
I need to use the 2.5V -3.5V cell to power each circuit but the voltage is too low for the LM3914 IC. I need to boost the 2.5V - 3.5V to greater than 6V to power the circuit. The MAX756 IC looked perfect but only goes to 5V and that is just a little too low.
Diagram explaining the situation is attached.
Any suggestions? Thanks for the help.
Thanks
I was going to use a common 12V power supply for each display but I just realized that won't work since all the grounds have to be common and with the cells all in series it would short out the batteries.
I need to use the 2.5V -3.5V cell to power each circuit but the voltage is too low for the LM3914 IC. I need to boost the 2.5V - 3.5V to greater than 6V to power the circuit. The MAX756 IC looked perfect but only goes to 5V and that is just a little too low.
Diagram explaining the situation is attached.
Any suggestions? Thanks for the help.
Thanks
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