I need to save space on PCB and have to convert voltage from +48 to +9, -9 and virtual ground. Is there a single IC that could do that?
You could do it, for just a few milliamps, with two zeners and a resistor.
If you did it this way you could probably get away with a 1206 SMD resistor (0.5W) and a dual series SOT23 zener, in total smaller than most linear regulator packages. Here is a possible circuit (output is 9.1V per rail):
____ 48V -|10k_|-+-- 9V | |__|__ / \ | 9.1V /___\ | | +-- GND | |__|__ / \ | 9.1V /___\ | Source COM -+-- -9V