Hello,
Typically if I had a buck converter IC passing +5V to an outward facing port, I would not include an ESD diode on the +5V line. (I'm thinking the LC filter sufficiently protects the IC from any ESD strikes that happen on the port?)
However, if I put an IC like the TPS25221 between the buck IC and the port, it seems like the TPS25221 is now vulnerable. All the EVMs I checked don't have an ESD device on the output of the USB switch IC, but there is the 150uF capacitor for USB compliance.
- Is the 150uF enough to absorb ESD strikes and protect the IC?
- We don't need USB compliance for our application. If we remove the 150uF capacitor, is it necessary to now add discrete ESD protection?
- Is the native ESD protection built into the IC enough to protect it under normal circumstances?
Thank you!
