Demonstration circuit 441 is a constant-frequency step-down converter, using the LTC3411 monolithic synchro-nous buck regulator. The DC441 has an input voltage range of 2.65V to 5.5V, and is capable of delivering up to 1.25A of output current. In Burst Mode operation, the DC supply current is typically only 240µA at no load, and less than 1µA in shutdown. In switching-noise sensitive applications, pulling the MODE pin to SGND inhibits Burst Mode operation. These features, plus the LTC3411 coming in a small 10-Pin MS package and having an operating frequency of 1MHz (allowing the exclusive use of low profile surface mount components), make the DC441 demo board an ideal circuit for use in battery-powered, hand-held applications.