fast 5v High Side switch controlled bz 3.3v
Use a level-translator.  There are many available but a common part is a 74HCT541 (older) or SN74LVC4245A (newer).  Both of these have 8 channels.  In general, you could use almost any of the HCT parts - the "T" specifies that the gate / buffer input is TTL compatible: less than 0.8V for a logic LO, greater than 2.4V for a logic HI.