hi lanp,
My requirement is, input voltage 5v and two output voltages, positive 3.3 and negative 3.3. This kind of converter is not given that link. please help me in finding this partnumber.
Given your small input/output voltage differrential Vin = 5V plus line variations LDO's would probably be the simpliest to build.You dont have to find cores.
The LM2991 & LM2941 or a suitable dual output LDO.