May LM22670/LM22676 can use in 12Vin -15V/1Aout applivation?

Hello,

Both the parts have a max switch voltage of 42V and switch current of 3A. For your design the max switch voltage would be 27V and possible peak current based on a 30% ripple current through the inductor would be 2.6A. Therefore I do believe that you could use those two parts for your design requirements. 

Regards,
Akshay