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TPS63020: TPS63020

Part Number: TPS63020
Other Parts Discussed in Thread: PMP9766
Hi, I utilized tps63020 with a supercapacitor in order to obtain a backup power supply. (see attached file: PMP9766 - Supercapacitor Backup Power Supply with Active Cell Balancing-).
I used more or less the same configuration visible in attached file  PMP9766 SCHEMATICS,  
It works but i don't understand why the tps63020 stop working when the capacitor  is still  3Volt charged.  i  hope The componet  should output 5 volt unless  capacitor  is 1.8 V (like datasheet say).
 it could be a problem of VTH? I tried changed  Vtrashold but the result is similar.
 if someone could help me i  would appreciate it!