I have a PRS 600, but I assume that supply requirement for the 300 is the same.
I was given a version 1 TomTom unit recently and the mains charger and car charger both give out 5.2V (less a few 10's of mV, as I checked it before plugging it in!) and the contact is correct for the 600.
I hope that this may be of assistance to others.
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