I am currently looking at the LTC4444 MOSFET driver.
It states that the rise and fall time of the gate driver for 1nF load. Is this 1nF load the Ciss value or Qg/Vgs of the MOSFET?
The data sheet will list the gate capacitance of a MOSFET. This is also one of the prime parameters in most parametric search engines online (for example, Digi-Key search.)
The symbol for gate capacitance is typically "Cgate" or "Cg" or "Ciss" (for "input capacitance.")
If you look at a typical MOSFET data sheet, you will see the gate capacitance listed. For small-signal discrete MOSFETs, it can be as low as 10 pF; for large power MOSFETs, it can be as high as 13000 pF (which is 13 nF.)
For example, the BUK9515-60E has an input capacitance of 2651 pF at 25V. The parametric search for this component can be found here: http://www.digikey.com/scripts/DkSearch/dksus.dll?WT.z_header=search_go&lang=en&keywords=BUK9515-60E
The data sheet for this component can be found here: http://www.nxp.com/documents/data_sheet/BUK9515-60E.pdf
The Ciss is listed on page 6/13 of that data sheet.