At 08:46 AM 02/09/2011, Kerry Wentworth wrote:
>
>Do you want to turn on the 'switch' and allow charge or discharge, or do
>you want to turn 1 FET on to allow charge or turn the other one on to
>allow discharge?
>
>If you tie the sources together, then the one with the drain to the
>battery needs a low gate voltage to turn on, and the one to the
>circuitry needs a high gate voltage to turn on.  Or you could just use 1
>FET from the battery - to ground, if you want to turn charge AND
>discharge on/off together.
>
>Kerry

Easiest way is to just use one of these:

http://pewa.panasonic.com/assets/pcsd/catalog/aqv-dip-high-capacity-catalog=
..pdf
http://www.toshiba.com/taec/components2/Datasheet_Sync//214/11172.pdf

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the rewar=
d"
speff@interlog.com             Info for manufacturers: http://www.trexon.co=
m
Embedded software/hardware/analog  Info for designers:  http://www.speff.co=
m



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