Demonstration circuit 1749A is a 42V, 2.5A micropower synchronous step-down regulator featuring the LT®8610. The LT8610 is a compact, high efficiency, high speed synchronousmonolithic step-down switching regulator that consumes only 2.5μA of quiescent current when output is regulated at 3.3V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8610 to minimize external components and simplify design.