The MAX20355 is a Power Line Communication (PLC) master with ModelGaugeTMm5 EZ fuel gauge and buckboost converter. The MAX20355 and MAX20357 provide a complete system solution for charging and data transfer between a charging case and a battery-powered device over a single contact.The PLC interface is capable of 100kpbs throughput while simultaneously providing 400mA of total charging/system current. A 4Mbaud half-duplex dataonly UART mode provides an easy and fast method for firmware updates, debugging interface, and factory modes.MAX20355 utilizes a 3.3W buck-boost converter with dynamic voltage scaling (DVS) to automatically manage the charging voltage based on the slave device MAX20357 control signal.Additional features include comprehensive slave device insertion and removal notifications, moisture detection, overcurrent protection, and 8kV contact rated ESD protection on the PLC outputs.APPLICATIONSTWS HeadphonesAugmented Reality GlassesWearable Devices