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Negative Input to Negative Output Buck Converter


We have the requirements as below,

Input : -15V

Output : -5V /500mA

Eff > 85-90% 

Topology : Non-Isolated Buck or eq.

Request to suggest the Analog /LT part to meet the above specs.

It will be appreciated if, parts are also available at LT spice for simulation.

Kind Regards,