Mouser, ADI's LT8228 and LTC7871
Bidirectional buck/boost controller supplied
Suitable for 48V/12V dual battery systems


Mouser Electronics, Inc. today announced that it is now stocking the LT8228 and LTC7871 bidirectional buck/boost controllers from Analog Devices (ADI), which provide bidirectional voltage/current regulation and bidirectional reverse current protection.

The LT8228 is a single-phase controller that provides a stable power solution for 48V/12V dual-battery automotive systems. The 12V bus powers the lighting, infotainment, and audio systems, while the 48V bus powers the active chassis systems, air conditioning compressor, and other performance systems.

The LT8228, a 100V constant voltage/constant current synchronous buck/boost controller, can determine the direction of power flow internally or externally.

Additionally, it features input/output protection MOSFETs to protect the circuit from negative voltages, control inrush current, and provide terminal-to-terminal isolation under fault conditions. Therefore, it is suitable for power failure protection systems, high-power system backup and supply stabilization, N+1 redundancy, and high-reliability power supplies.

Mouser also offers the ADI DC2351A demonstration circuit, designed for evaluating the LT8228 with a 36-54 V output on one side and an 8-14 V output on the other. This circuit can deliver a maximum output current of 35 A in buck mode, 7 A in boost mode, and can be paralleled with another DC2351A board to increase total output current.

The LTC7871 is a 6-phase bidirectional switching regulator controller that operates in either buck or boost mode when required, making it ideal for 48V/12V automotive dual battery systems.

The LTC7871 transfers energy from one battery to the other, allowing both batteries to supply energy to the load simultaneously. Its unique constant-frequency current-mode architecture improves signal-to-noise ratio, enabling low-noise operation and providing excellent current matching between phases.

Additional features include an SPI-compatible serial interface, discontinuous/continuous operation modes, OV/UV monitors, independent loop compensation for buck/boost operation, accurate inductor current monitoring, and overcurrent protection.