MP2733 & MP2702A Battery reverse polarity protection

Battery Management
1

Hello,

Regarding the MP2733 and MP2720A devices:

  • Datasheet says nothing about battery reverse polarity protection. I’ll assume it is not supported by de devices it self - can you clarify this?

  • If reverse polarity protection must be implemented externally, will the P-Mosfet solution be compatible with charging / discharging and safety functionality of the devices?

  • Are there any other concerns in terms of proper BMS functioning moment external P-Mosfet is inserted between BATT pin and a positive terminal of the battery that I’ll have to be aware of? Will specified performance of the BMS be affected in any way?

  • If external P-Mosfet protection type is possible, are there any special requirements for the P-Mosfet beside sufficient Vgs & Vds? At the moment I’m considering SISS63DN for it’s low Rds_on.

Thanks.

2

Hello @User01701,

Welcome to MPS forums. The MP2733 does not support battery reverse polarity protection. The P-MOS solution can be made compatible with charging/discharging functionality of the devices if the configuration is implemented properly. How are you planning to use the P-Mosfets? Based on that, I’ll have a good understanding of your system.

3

Hello @Saquib.FAE , and thanks for you answer.

In essence I’m interested in simplest way of having RVP implemented.
on conceptual level, p-mos (SISS63DN for example) as depicted on the attached image. Would this be possible at all?

BMS_RVP
BMS_RVP1000×866 169 KB

If not,
feel free to propose any mods necessary for mentioned devices to operate properly with RVP on top of them.

Thanks.