3.3mF 100V Capacitor charging circuit?
Connect the '+' side of your input voltage to the '+' side of the cap.  Connect the '-' or GND side of your input voltage to the '-' side of the cap.  That's it!

Honestly, this cap isn't large enough to be consider a "supercap".   And for most circuits this cap isn't big enough to require any special charging circuits.  

If there is a reason for having a charging circuit, then you didn't say why in the question.  We would also need to know more information about the 60-80v input power (max current?) and what/how you want the cap charged.  Without that information, all I can recommend is just connecting up the cap with some wire.

Update:

To limit the charge current to 250 mA then there are a couple of ways to approach this.  The easiest way would be to put a 320 ohm 20.0 watt resistor between the power supply and the cap.  This is going to limit the charge speed by quite a bit, so beware.  With a 80 v input, the cap will charge to about 49v in 1 second, 68v in 2 seconds, and 78v in 4 seconds.  

Somebody is going to comment/complain that a 20 watt resistor is overkill, but it is not!  Peak power will be 20 watts, but average power could be much less depending on the use.  If you don't use a resistor able to handle to 20 watt peaks then it could get damaged.  The easiest way to get that is to just buy a 20 watt resistor.  Since the 20 watt peak is for a short period of time you might get by with a smaller resistor that is rated for 20 watt pulses but that means that you have to read the datasheet for the resistor carefully.  Since nobody wants to read datasheets for resistors, just use a 20 watt resistor.  You probably don't need a heat-sink on this resistor.

If you need the cap to charge more quickly than 2-4 seconds then your best option is to make a constant current switching power supply.  These types of circuits resemble a "buck converter" but are somewhat modified to regulate current instead of voltage.  Normally a switching regulator/converter is tricky, but you have the added problem of having an 80v input, which is high for such a device.  I did a little searching on some chip manufactures web sites and couldn't find anything easy to use.  It probably doesn't matter, however, since I doubt that you want to tackle a project of this difficulty.

Another option is to have several resistors, 320 ohm, 220 ohm, 110 ohm, etc., and use MOSFET's to turn each of them on as the cap charge voltage goes up.  Voltage comparators or even a microcontroller with ADC inputs could be used to control this.  This works for something relatively quick and easy, although I would consider it a bit of a hack.

In my opinion, if the single 20 watt resistor doesn't work for you then you might be better off simply getting a different power supply that can provide more current without blowing a fuse.  Seriously!