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How to use LTM8045 for getting +1.8V from -5V

Hello,

We received a question about a way for geeting +1.8V 4A from -5V from our customer. Following is one of the idea.

Can we use LTM8045 like this circuit?  

 If no, are there any idea for getting +1.8V 4A from -5V?

Best regards,

Akira