DC2012A, Demo Board featuring LT8610AB 42V, 3.5A Micro-power Synchronous Step-Down Regulator. The LT8610AB is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5 uA of quiescent current when output is regulated at 5V. The efficiency of the circuit's greater than 90% at light load up to 1.5A