Negative input to negative output with LT8364

Question

Hi, ADI experts: 
 I want to convert a -12V input DC voltage to a -1.5V to -5.5V, Io=-3A output DC voltage by LT8364, is it possible? 
 my assumption is shown below. Any more detailed application circuits or notes could be given for LT8364, especially for the level shift circuit. thanks a lot!

Merry Christmas！

ron.p · Answer

Hi Shawn_Tao, 
 You can verify this design using LTSpice. You may also take a look at LT8302 ( LT8302 LT8302-3 Datasheet and Product Info | Analog Devices ) and check negative buck converter application on page 23. You can use it as reference in designing your circuit.