Features and Benefits

  • Power Line Communication (PLC) Interface
    • 100kpbs System Throughput
    • 167.7kpbs Bit Rate
    • 200mA Dual-Slave and 400mA Mono-Slave Output Charging Current
    • Automatic Earbud Insertion/Removal Detection
    • 4Mbaud, Half-Duplex, Data Only UART Mode
    • PLC Controllable GPIOs, Reset and Shipping Mode
  • High-Efficiency Autonomous Charging System
    • 90% End-to-End Charging Efficiency from Master to Slave Battery
    • 400mA Integrated Linear Charger
    • Optimized Charging Efficiency by Automatic DVS Negotiation between Master and Slave
  • Robust PLC Output Protection Features
    • Highly Flexible Moisture Detection Block
    • Input Current Limiting
    • 8kV Contact ESD Protection
  • Small Solution Size
    • Low External Component Count
    • 2.69mm x 2.69mm 36-bump, 0.4mm pitch WLP Package

Product Details

The MAX20357 is a Power Line Communication (PLC) slave with ModelGauge m5 EZ fuel gauge and charger. The MAX20357 and MAX20355 provide a complete system solution for charging and data transfer between a charging case and battery powered device over a single contact.

The PLC interface is capable of 100kpbs throughput while simultaneously providing 200mA of charging/system current per channel. A 4Mbaud halfduplex data only UART mode provides an easy and fast method for firmware updates, debugging interface, and factory modes.

The charger on slave device MAX20357 controls the output of the 3.3W buck-boost converter in the MAX20355 with dynamic voltage scaling (DVS).

The MAX20357 integrates an ultra-low power fuelgauge which implements the Maxim ModelGauge m5 algorithm. The IC monitors a single-cell battery pack and supports internal current sensing.

Additional features include comprehensive master device insertion and removal notifications, moisture detection, overcurrent protection, and 8kV contact rated ESD protection on the PLC output.


  • True Wireless Stereo Headphones
  • Augmented Reality Glasses
  • Wearable Devices

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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