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Demonstration circuit 1442A is a step-down converter, using the LTC3603EUF monolithic synchronous buck regulator in the 4 × 4 QFN package. The DC1442A has an input voltage range of 4.5V to 15V, and is capable of delivering up to 2.5A of output current. The output voltage of the DC1442A can be set as low as 0.6V, the reference voltage of the LTC3603EUF. At low load currents, the DC1442A can operate in either noise sensitive applications, due to the capability of the LTC3603EUF to operate in pulse-skipping mode, or in high efficiency applications, because the LTC3603EUF can also operate in Burst-Mode®. Because of the high switching frequency of the LTC3603EUF, which is programmable up to 3 MHz, the DC1442A uses low profile surface mount components.