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5v step-up/step-down with -19 negative voltage rail?

#1

Hi there - I’m rather new to voltage regulators, being a hobbyist who repairs and modifies hand-held gaming consoles like the Game Boy.

I’m running into failing DC-DC converter boards and would like to explore modern replacements, but I can’t seem to find data sheets on the regulators from Pololu. I’ve been using Pololu regulators for other modifications, and this is my first look into the stock DC-board replacement.

Are there any Pololu 5v step-up/step-down regulators that would meet these specs?
• -19v on the negative voltage rail
• Output: 1.5A (preferably more)
• Input voltage between ~2v and 7v (at least)

Most notably I can’t find negative voltage information which is key in this effort.

The S18V20F5 looks perhaps close, if I knew the negative voltage capability.

Thanks for any tips!

#2

Hello.

None of our regulators are designed to output negative voltages. If that is not what you mean, could you describe more about what you are trying to do?

-Tony

#3

Hi Tony - I asked in the forums since I didn’t expect the emailed support to get into details, sorry for the confusion.

The stock DC-board of an original Game Boy is really just a DC-DC convertor that outputs 5v to power the system but also uses a -19v negative voltage rail as the LCD display bias. Why it does this, I’m not sure, but I know that as the negative rail goes from -19v and starts getting to -15v, some very odd display things occur.

I’ve since writing earlier heard that some hobbyists might create a board that does it.

In short it sounds like this isn’t a typical behavior that I’ll just be able to buy and replace the stock one.

Thanks, still, for the support and great products. I exclusively use Pololu regulators in all my customized consoles.

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