Hello!
I have a question regarding the TPS54x60 family of buck regulators that we are using. In almost all of our modules we have input circuits which are connected to various vehicle signals. These signals are clamped to the supply rail which is generated from the TPS54x60 device (e.g. 5V supply rail). In most applications to this point, our module is running (always-on) and there is plenty of current draw to offset the current injected as a result of the voltage clamps. I have a couple applications coming up where we need to enter into a low power mode but keep the 5V supply alive (i.e. 5V supply current draw is sub-milliamp). In these cases, will the TPS54x60 lose regulation if the clamped current injected into the rail is greater than the current drawn from the rail or is there something internal to the TPS54x60 that will sink that excess current? Since the TPS54x60 is asynchronous, there isn’t anything external that I see capable of sinking current other than the voltage divider for setting the output voltage level, but that obviously won’t sink much.
Any feedback or input is welcomed and appreciated! Thanks again!
Paul
