  The ATLAS Insertable B-Layer (IBL) detector was installed into the ATLAS
experiment in 2014 and has been in operation since 2015. During the first year
of IBL data taking an increase of the low voltage currents associated with the
FE-I4 front-end chip was observed and this increase was traced back to the
radiation damage in the chip. The dependence of the current on the
total-ionising dose and temperature has been tested with X-ray and proton
irradiations and will be presented in this paper together with the detector
operation guidelines.
