Buck/boost controllers provide power for dual-battery automotive systems

Bi-directional buck/boost controllers for dual-battery automotive and industrial systems by Analog Deivces are now available from Mouser.

The LT8228 and LTC7871 bi-directional buck/boost controllers offer bi-directional voltage or current regulation and bi-directional reverse current protection.

The LT8228 is a single-phase controller that offers a stable power solution for 48 and 12V dual-battery systems in automobiles, in which the 12V bus powers the lighting, infotainment, and audio systems and the 48V bus powers systems such as active chassis systems and air conditioning compressors. The controller is a 100V constant voltage or constant current synchronous buck or boost controller, with the direction of power flow determined automatically by the LT8228 or controlled externally. The controller features input and output protection MOSFETs to control inrush currents, guard against negative voltages, and provide isolation between terminals under fault conditions. The controller can also be used for power interruption protection systems, high-power system backup and stabilisation, and N+1 redundant, high-reliability power supplies.

The second device, the LTC7871, is a six-phase bi-directional switching regulator controller that operates in either buck or boost mode on demand via control signal, for use in automotive 48 and 12V dual-battery systems. It allows both batteries to supply energy to the load simultaneously by driving energy from either battery to the other. A proprietary constant frequency current mode architecture enhances the signal-to-noise ratio for low-noise operation and current matching between phases. There is also an SPI-compliant serial interface, discontinuous or continuous mode of operation, over voltage and under voltage monitors, independent loop compensation for buck and boost operation, accurate inductor current monitoring, and over current protection.

The distributor also stocks the Analog Devices LT8228 demo circuit DC2351A, designed to have 36 to 54V on one side and 8.0 to 14V on the other side. The circuit can supply a 35A maximum output current in buck mode while delivering 7.0A of current in boost mode. The demo circuit can be paralleled with other DC2351A boards to increase output current with adequate airflow or heatsinking, adds Mouser.


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