EMC improvement for LDO

[mswug]

Now I have a project to improve EMC immunity for a LDO, How can I to improve it?
A customer have a MCU chip want to use our IP( LDO). However, the application envirement has a motor that generates EMC. So they want us to improve EMC le immunity of our LDO ip, but for cost controlling they want only three metal for whole chip.

Thanks

 

[hung_wai_ming@hotmail.com]

Hi mswug,

EMC is a complex issue. MCU with LDO is more complex. First of all, you need to understand if LDO can really be used to solve your customer's EMC problem. Most of the time, EMC issue in MCU did not come from VDD noise or VSS noise. It mainly comes from IO pins either radiative or conductive EMI from outside world. Therefore, your LDO may not solve the issue.

I would first recommend you first check your customers' problem first.

To answer your question, LDO can only provide PSRR good to MCU chip, so it will not help much in EMC especially the EMI from outside is radiative

 

[leo_o2]

Hi mswug,

Did you solve LDO IP EMC problem?