Voltage division without affecting current
Do you mean something like this:-



where U1 is an op amp in the typical voltage follower configuration.  This might be good enough for 30 - 60 mA with common op amp types.  If you actually want to have the same current out as in, whilst reducing the voltage (through division) you're looking at a much more complicated current mirror affair.

You'll have to be careful of getting close to the power rails if R1 /R2 is extreme relative to the power supply, in which case you'll need to use rail to rail op amp types.