Low ESR ceramic capacitors such as X7R or X5R is preferred for input decoupling capacitors and should be places as close as possible to the supply and ground pins fo the IC. Due to the voltage derating of the capacitors it is recommended at 25-V rated capacitors are used for IN and PMID pins which can normally operate at 5 V. After derating the minimum capacitance must be higher than 1 µF.