DC2855A, Demo Board, LTC7818EUJ#PBF, Synchronous Buck & Boost Converter, Power Management

Demonstration circuit DC2855A is a triple output synchronous step-up/dual step-down supply featuring the LTC®7818. 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 are able to 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 ¾" by 1½", while the main boost circuit area is ¾" by 1¾". The package style for the 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, a PGOOD signal (CH1 only), an overvoltage indicator for CH3 and a mode selector that allow 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
• Switching frequency of 2200KHz
• Efficiency of 94.6% at VIN = 8V, VOUT3 = 10V, IOUT3 = 10A, RUN1, 2 = 0