Joel Koltner wrote:
"Joerg" wrote in message
t...
How much current do you need out of it? I suppose a few ten mA and there you
can afford a lower switching frequency.

I started with 150mA absolute maximum, and at this point 100mA looks like
plenty. I actually have tried this board at a lower frequency -- Linear has
the LTC1877 which is footprint-compatible with the LTC3404 and switches at
550kHz. Efficiency is noticeably better at 550kHz (up to 95%!), but the
larger inductor needed is too big for the PCB. It also jitters a bit, but
significantly less so than the '3404 (not too surprisingly).


Ok, not shielded and a bit tight on current but should be in the ballpark:

Digikey P/N 490-2521-1-ND

How large can it be?

If you wanted to really curb jitter in a test you could drill holes and
run the rework wires behind the ground plane.

--
Regards, Joerg

http://www.analogconsultants.com/