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Choosing the right chips

JD Peiffer
Prodigy 130 points
Other Parts Discussed in Thread: TPS54627, BQ25883, BQ25882, BQ25886, BQ25887

My team and I are designing a PCB for a robotic prosthetic hand. We want to be able to plug in a USB and have the PCB charge a LiPo 7.4V 2S, 1300mAh battery pack. We would like the components of the PCB to balance the cells and protect them from over and under voltage. 

Essentially, we want the cells to be well monitored and stable as they will be in the prosthetic and attached to someone. We do not require any interface with a microcontroller, although this could be nice in the future--same goes for temperature monitoring.

The battery will output directly to a voltage regulator (TPS54627) as all of our servos and sensors run on 5V. Any suggestions would be helpful, but I will try and look more into options. Just unsure of what features to include on which chip, how many we need, etc.


Thanks,

JD

  • 0
    TI__Intellectual 1640 points

    Hi JD,

    You can consider looking at our latest BQ2588x (5V USB input to charge 2S LiPo) family of chargers. We have 4 different chargers in the BQ2588x family.

    1. BQ25882/3: I2C controlled boost charger to charge 2S LiPo battery configuration from 5V USB input. Some other functionalities include Power path, D+/D- USB BC 1.2 Detection, integrated ADC to monitor battery. BQ25882 is a CSP package, where as BQ25883 is a QFN package

    2. BQ25886: Standalone boost charger to charge 2S LiPo battery configuration from 5V USB input. This also has power path and D+/D-, and comes in QFN package

    3. BQ25887: I2C controlled boost charger to charge 2S LiPo battery configuration from 5V USB input. This part comes with cell balancing functionality, and also has integrated ADC to monitor battery. BQ25887 comes in QFN package. 

    Let us know if you have any further questions.