Answer:
Maxim does not have an IBIS model for the MAX2771 device. None is planned for the foreseeable future.
MAX2771
Production
The MAX2771 is a next-generation Global Navigation Satellite System (GNSS) receiver covering E5/L5, L2, E6, E1/L1 bands and GPS, GLONASS, Galileo, QZSS...
Datasheet
MAX2771 on Analog.com