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Analog Devices Inc. DC3151A Demo Circuit for LTC7811 is a non-synchronous boost plus a dual synchronous buck power supply featuring the LTC7811. The demonstration circuit is designed for two buck outputs, 5V/10A, 3.3V/7A, which are supplied by a boosted 9.5V output. The buck outputs can maintain regulation over a wide input voltage range of 4.5V to 36V, 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 ¾” by 1½”, while the main boost circuit area is ¾” by 1¾”. The package style for the LTC7811 is a 40-pin exposed pad QFN.
The Analog Devices Inc. DC3151A main features include rail tracking (Buck channels only), an internal 5V linear regulator for bias, and separate RUN pins for each output. It also consists of a PGOOD signal (CH1 only), a battery monitor, and a Mode selector that allows the converter to run in CCM, Pulse-skipping, or Burst Mode operation. Spread Spectrum Mode is available for EMI improvement. Synchronization to an external clock is also possible.
