Hi,
There is no option to down load 3 info obejcts data at once.
You can directly download respective data from their P tables(3 times).
Below your info objects.
0MATERIAL
0MAT_PLANT
0MAT_SALES.
for info object, P master table name will be like /BI0/P<info objectname>.
By using Se11/16, you can enter P table names, download output data into excel or CSV using menu options.
You can take abap expert help to download data from tables to excel/csv.
Thanks