Demonstration circuit 828 is a step-down converter, using the LTC3409 monolithic synchronous buck regulator. The DC828 has an input voltage range of 1.6V to 5.5V, and is capable of delivering up to 600mA of output current at a minimum input voltage of 1.8V. The output voltage of the DC828 can be set as low as 0.6V, the reference voltage of the LTC3409. The DC828 can operate in noise sensitive applications, due to the LTC3409 operating in pulse-skipping mode at low load currents. The DC828 is a high efficiency circuit - over 90%, and during shutdown, the DC828 consumes less than 1uA typically. In Burst-ModeTM operation, it consumes only 65uA of quiescent current. Because of the frequencyselect capability of the LTC3409, the DC828 can operate pability of the LTC3409, the DC828 can operate at fixed frequencies of 2.25 MHz or 1.5 MHz, allowing the exclusive use of low profile surface-mount components. The DC828 can also be clocked by an external oscillator, due to a phase-lock loop circuit in the LTC3409. These features, plus the availability of a low profile 8-Lead DFN package, make the DC828 an ideal circuit for use in battery- powered, hand-held applications.