LM5155: LM5155 low input

Part Number: LM5155

Hi team,

i would like to know whether LM5155 can be used in below applicaiton? If not, any more suggessed solution? Thanks. 

1. input 2.8V-4.4V(1s battery)
2. output 50W (Vout>=6V), can be 10V5A or 8V6A or 7V7A