Li-ion 3s Battery Charger with Load Sharing

by Daniel Hazeley   Last Updated March 14, 2019 20:25 PM

I am requesting help to create a battery charger and load sharing circuit with the following specifications:

  • 3s Lithium Ion battery
  • 12 V at 2 Amps to power TPA3128D2 Class-D Amplifier (this is for max volume. Possible to lower the voltage/current to accommodate design constraints)
  • 2.7 V at 50 mA, low noise to power STM32F4 microcontroller as well as external DAC and analog circuitry
  • Charging done via USB Micro-B port with USB 2.0 (5 V at 500 mA or 1.5 A)

I am currently considering this design:

  • Power Circuit Module to handle battery charging and balancing.
  • BQ25713 to handle the load sharing/power path management as well as 12 V boost converter
  • TPS62125 to output the 2.7 V from the BQ25713 power path
  • BQ24392 to handle USB charge detection/enumeration

I would appreciate any help on confirming or denying the viability of this design as well as any suggestions on any improvements that can be made for simplicity.



Related Questions


Updated October 10, 2018 13:25 PM

Updated October 17, 2018 23:25 PM

Updated September 20, 2018 16:25 PM

Updated April 11, 2018 13:25 PM

Updated June 22, 2015 04:10 AM