David Duffy (AVD) wrote:
> We've always programmed (DIP) PIC chips using our PicStart+
> programmers, but this can be a real pain when debugging code and
> precludes the use of SMD packages. So, I'm wanting to implement ICSP
> on all new boards where possible.

Take a look at my ICSP discussion at http://www.embedinc.com/picprg/icsp.ht=
m
early in the design.

> My first thought is to use a 5V regulator (SOIC-8 or SOT-23) that
> doesn't mind having the 5V from the ICSP connection being applied to
> its output.  How do other people approach this problem?

You can also put a reverse diode around the regulator if you use something
like a 7805 that doesn't have a FET as the pass element.

5V and 50mA out with 8-12V in sounds like a good application for a 7805.  A=
t
350mW max, you can use a surface mount version without additional cooling
considerations.  I would not want a SOT23 to handle sustained 350mW.


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