Regulator HELP! NOW! PLEASE!

[JonathanMC]

If I wanted to bring 7.5V up to 12V for an N64P, would this work?
http://focus.ti.com/docs/prod/folders/p ... 61175.html" onclick="window.open(this.href);return false;
It says that it will take 5V up to 12V, but if that doesn't work, then what will???
(I need 12V for the screen.)

Edit: I dont want to try that one because
1. it steps 5V up to 12V, so it would step 7.5V up too much. And it is too sophisticated. Someone help!

[evilteddy]

Seems like overkill but it should work providing you can solder htssop packages.

[unicycler17]

What screen are you using that requires 12v? Have you tried running the screen off a lower voltage?

[JonathanMC]

I haven't tried soldering htssop packages, and i would really prefer the simplest regulator possible. The 8" screen i'm using doesnt run on lower voltages.
If anyone has a link to a simple 7.5V to 12V step up regulator, please tell me!!!

[spinout]

You're screen probably just takes the 12V and steps it down with a 7805. More information, perhaps pictures, of the screen you are using would help the issue.

[JonathanMC]

I don't think so, but what if I added a 3.7V battery. 7.5+3.7 equals about 11V which should be enough.
If I had 11V what resistor would I need for the pth08080 (he resistor affects the voltage output.)

[spinout]

I think you can only add up individual cells that way, not entire battery packs.

[JonathanMC]

That didn't make much sense to me...

[evilteddy]

Its very simple. If the new cells you add to the battery are of different capacity or chemistry then they will discharge at a different rate. You will eventually get to a point where the smallest cell is empty and the other cells are not. I believe that in this case the other batteries can still drive some current through the discharged cell for a while, all the time doing it damage. You can add a cell to a battery as long as its the same as the cells already in the battery. Just add it when they're all at full charge.

Which screen are you using?

[JonathanMC]

Ok, but what if the 3.7V ones had a protection circuit?
The screen i'm using was bought from another modder, but they aren't sure what kind it is.