TPS82085: What is device statue when EN between 0.4V and 1V

Lin_Charles

Part Number: TPS82085
Other Parts Discussed in Thread: TPS54325,

Hi team,

It is nice to know you here. The customer is asking us what is device statue when EN between 0.4V and 1V? Will this EN value lock our device? Thanks.

BR,

Charles Lin

over 4 years ago

0 Chris Glaser over 4 years ago

TI__Guru*** 146410 points

Hi Charles,

Here is an app note which explains the EN pin spec: https://www.ti.com/lit/an/slyt730/slyt730.pdf

A voltage between the logic high and low levels will not lock the device and could be read as either a high or a low.

0 Lin_Charles over 4 years ago in reply to Chris Glaser

TI__Expert 4260 points

Hi Chris,

Thank you for your appnote here. If I decrease EV voltage from 1.5V to 0.8V and wait for about 400ms. Then increase EN from 0.8V to 1.5V, how will our device behave. Will it behave like this post? https://e2e.ti.com/support/power-management/f/196/p/918373/3395354#3395354

BR,

Charles Lin

0 Chris Glaser over 4 years ago in reply to Lin_Charles

TI__Guru*** 146410 points

Thank you for giving the background of your question. If you want, I can check your circuit to see if some small redesign is possible to avoid the case where EN drops so much.

The TPS82085 is very different internally from the TPS54325 in the other thread. That behavior should not happen.

If EN drops to 0.8V, the device may turn off. Or it may keep running.

Power management

Power management forum

TPS82085: What is device statue when EN between 0.4V and 1V