MPQ4480 - RGND Usage

Applications
1

Hello,

This feels like a dumb question BUT what is the point of the RGND pin on MPQ4480? Is it strictly to reverse battery protect external devices (USB devices)?

Basically, I am wondering if I can just connect all ICs and modules on the 5V rail to the standard ground or if all loads need to be connected to RGND.

My application will have a couple of USB ports (at a max of 500mA), and I assume I should use RGND for them? If I don’t care about reverse battery protection, I should be fine to connect all loads to the standard GND, correct?

My application:

12v VIN → 5VOUT

Typical load = 2A

Thanks!

-Ted

2

Hello Ted,

There are no dumb questions here if other people can benefit from them being asked!

RGND is the remote power ground where this is mainly used for USB_GND short to battery protection. There is an integrated 4mOhm current sensor between PGND and RGND in order to sense current between these two points. Do you have any questions given the following explanation in the datasheet:

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3

Generally, most power connections should be connected to PGND. If you don’t care about this protection feature, then feel free to stick to PGND.

Best,

Krishan