MP2733 & MP2702A Battery reverse polarity protection

[User01701]

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.

[Saquib.FAE]

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.

[User01701]

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?

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

Thanks.