Reference Design Of USB BC 1.2 Compliant Charger

This Reference Design from Maxim Integrated is optimum for both charging and monitoring the status of a Li-Ion cell. The reference design employs a MAX14746 IC which is a USB charger that integrates a charger detector, linear regulator, and smart power selector to provide up to 2A of charging current. The reference design is compliant with USB Battery charging  Rev1.2*. The charger is capable of detecting different batter charging methods including Standard Downstream Port (SDP), Charging Downstream Port (CDP), and Dedicated Charging Port (DCP). The reference design can also detect common proprietary charge adapters, including those from Apple1.

This reference design employs the ModelGauge m5 algorithm which offers high estimation accuracy and has a low power consumption. The reference design can be used for various applications which include portable consumer devices, digital imaging (DSC, DVC), portable industrial devices, USB 1-cell pack equipment, etc.

Block Diagram of Reference Design is shown in the figure below:

Block diagram of Reference Design.

The MAXREFDES1219 can be configured quickly and easily by using the GUI software provided by the company, it requires a dedicated breakout board for connecting it with the PC. The GUI’s demo view window displays the status and enables the control of both the charger and the fuel gauge monitor. The software is easy to use and automatically detects the hardware on making the connection.

Features of Reference Design

  • USB Battery Charging Rev. 1.2 compliant
  • Simple GUI for monitoring and controlling the parameters
  • Max current 2A
  • Windows 10 Compatible Software
  • I2C Serial Interface
  • State of Charge (SoC) measurement

Safety Features

  • Charger detection
  • JEITA Charge Protection
  • Thermal Protection
  • Battery cell monitor
  • Open Circuit Voltage (OCV)
  • Temperature monitoring
  • Current monitoring


The company has provided all the essential resources including the BoM, Gerber files, Schematics, test results, etc. But to view the resources you first need to register on the Analog Devices Website.

You can get more details about the reference design and download the additional resources by visiting this link.

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