TPS63700: finding negative input and negative output solution

Dear team,

Do we have the solution about negative input and negative output?

Customer have 2 requirements:

1. Vin= -18V, Vout= -12V or -15V, Iout=2A 

2. Vin= -60V, Vout= -15V~ -50V (output tunable by digital interface, like I2C), Iout=1.5A

Thank you.

Best Regards,

Cindy