Analog Devices Inc. DC2855A Demo Circuit for LTC7818

Analog Devices DC2855A Demo Circuit for LTC7818 is a triple output synchronous step-up/dual step-down supply featuring the LTC7818. The demonstration circuit is designed for two buck outputs 5V/10A, 3.3V/10A, supplied by a boosted 10V output. Benefiting from this feature, the buck outputs can maintain regulation over a wide input voltage range of 4.5V to 36V, which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout whereas the main buck circuit components fit in an area of 3/4” by 1-1/2”, while the main boost circuit area is 3/4” by 1-3/4”. The package style for the Analog Devices LTC7818 is a 40-pin exposed pad QFN.

The main features of the board include rail tracking (Buck channels only), an internal 5V linear regulator for bias, separated RUN pins for each output, and a PGOOD signal (CH1 only). It also includes an overvoltage indicator for CH3 and a Mode selector that allow the converter to run in CCM, Pulseskipping, or Burst Mode operation. Spread Spectrum Mode is available for EMI improvement. Synchronization to an external clock is also possible.