Radiated emission and ESD issue with MP2760GVT

Battery Management
1

Hi,
I use MP2760GVT-000A-Z in a design with USB-C PD, 15V, 3A input, and 2cell in series, 8.4V output. We fail radiated emission at 80MHz and 200MHz and have ESD issue when connector ground shield on our device. Do I need external protection to meet EMC requirements? Such as filter on input and/or output of the charger IC or maybe a common mode choke to solve the radiated emission issue?
I also wonder if it’s suggested to connect shield ground directly to GND or via a ferrite or 1Mohm and xnF in parallel to GND to solve the ESD issue?
I notised that the datasheet and the Eval schematics are different, the eval schematics show 100nF not only differential but also one on IAP/IAN to GND and SRP/SRN to GND, do they have any regulation function to reduce glitch on the output?

Thanks in advance.
Best Regards
Jörgen Eriksson

2

Hello @jes,

Welcome to MPS forums. The ESD issue could be a result of bad layout, improper placement of components on the board, ground connections. It is recommended to connect the shield ground directly to the negative terminal of the battery(single point) to avoid interference with ground loops, leading to more noise. Please refer to the EMC interference management below

The input and battery current sense pins (IAP/IAN & SRP/SRN) ensures short-circuit protection(SCP) by limiting the current and improving the loop stability. I would recommend following the Eval board design as it ensures the optimal performance of the IC.