Re: [EE] looking for negative 5V regulator or circuit

RussellMc <[email protected]>
Newsgroups gmane.comp.hardware.microcontrollers.pic
Message-ID <CACZQxzNcH4U8XES3RJuemh-kQt9-30N9ctBT4YNPEwfZYOJsmg@mail.gmail.com> 
On Wed, 11 Jun 2025 at 06:45, Dwayne Reid <[email protected]> wrote:

> I'm working on a project where I need a negative 5 Vdc rail relative to the
> incoming +12 Vdc rail.  My first thought was a bog-standard 7905B regulator
> (the "B" suffix denotes -40C operation) but this is a battery-powered
> system and the worst case bias current of 8mA is way too high.
>
> Please clarify how the negative voltage is provided.
Do you need to use the +12V rail to make -5V or is there a negative supply
already available ?


    Russell
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