UC1843A-SP: Application note or example layout for LCCC-20

Hey Aki,

I don't have anything specific to the LCCC package for you, but I can comment on some guidelines.

The GND pin will be for the analog circuitry and thus its important to isolate this ground from noise caused by switching when possible.

The PWRGND can be a bit noisier since it will be for the outputs.

I do suggest for PWRGND adding a schottky diode between the output and PWRGND to help prevent noise from interuppting the system.

The same can be added between Vc and Output for similar benefits.

Thanks,

Daniel

Hi Daniel,

The Schottky diodes that you've mentioned have already been implemented in the circuit.

My inquiry was more related to the layout itself; again, I was looking for recommendations on the PWRGND and GND pins as they are next to each other (and needless to say, quite close in distance).

Thanks again,

Aki

Hey Aki,

A common method for separating PWRGND and GND is not connecting them on the top layer and connecting them on other layers.

This allows for some isolation from noise for GND while not having a large resistance in-between the two.

Thanks,

Daniel

Hi Daniel,

Just to follow up: the only layout recommendations that you have are for the dual pack, but not the quad pack (LCCC), for this or a similar function part?

Thanks,

Aki