DC2543B

Demonstration circuit 2543B is a high efficiency, high density, open loop charge pump (inductorless) DC/DC converter. This demo board is a voltage divider which achieves a 2:1 step-down ratio from an input voltage from 36V to 60V. The output voltage is a fixed ratio of half of the input voltage (V IN /2) and can supply a 10A load current. This demo board has the option to deliver a 20A maximum load with the addition of 15 chip capacitors.

The DC2543B provides a very high efficiency solution of 98.7% when converting 48V IN to 24V OUT at 10A. When configured for a 20A output, an efficiency of up to 98.4% is achievable for a 48V IN to 24V OUT at 20A.

The demo board features the LTC7820, a fixed ratio high voltage high power switched capacitor/charge pump controller in a 4mm × 5mm QFN package. Please see LTC7820 data sheet for more detailed information.