LTC4013 confusions

Good day,

          We are desing 36v vin to 28.7v 7cell li-ion battery charger with LTC4013. We use one  DC load to simulate the batterey to test, but the SW just output 0v. INTVCC =5v, seems no calculation faults with external RC. Can you help to advice

1) Does LTC4013 only work with real battery?

2) Float INFET is OK?  We do not need MTTP function, only one pure battery charger.