6v source + 250 mA / 3.3V drain

Hello folks,

1) I'm intending to power my mini via a 6V battery power. Any problems ?
From what I saw the regulators can handle that easily, but my concern is
related to the LCD (mine is a T35).

2) I'm also intending to run a custom board (from my last project's
incarnation) that needs about 250 mA / 3.3V - so, albeit the 3.3 regulator
can source 800 mA, andahammer's faq states that at peak mini2440 uses 600
mA, and that puts me a little over the edge. I'm biased towards an external
regulator, but if I can avoid an extra hw...

Thanks for your time  :)

Max voltage rating on LCD 5.5 or 5.6V.  The datasheet is on the front page.
I wouldn't put 6V on mine as I don't want to take the chance of blowing it
up, but for you . . .

Does that quoted 600mA for the 3.3 or the 5V?  I think you will find a fair
chunk of the input current goes to the LCD.  I would measure how much
current is really drawn off the 3V3 reg and then make an informed decision.
 Those regulators probably are current and temperature protected, if not
the cost of replacing one of those is small compared to the CPU or LCD.

I'd use a separate supply and not muck about with the dev board.

you  can drop  the 6  vlt  battery  down  by placing    2  silicon  diodes 
in  series  with  the    supply  line    2  diodes  in series  will  drop
about  1.2  vlts

You  might be OK with this, if the battery voltage was a constant 6V.  I
found my board dropped out at about 4.7 Volts.

The other problem is that a 6Volt (Lithium?) battery when fully charged
will put out more then 6Volts. Diodes may not help in this case.

Look at the nominal discharge voltage rating for your pack. Maybe, a 1Amp
5V LDO could do the job if your battery voltage doesn't go below about
5.5Volts.