In one application, I have a control signal (0-5VDC) that I'd like to use to directly drive EN. There are times when VBAT may be floating, however (no battery connected), so the TPS61072 would see an open VBAT and up to 5VDC on EN for long periods of time.
Is that safe for the part?
Hi Steve,
I have tested the case you mentioned above. Please kindly check below waveforms. I used TPS61070 instead because there is no TPS61072 in the lab. The EN structure internally should be same.
Channel 1 is Vin, 3.3V, Channel 2 is Vout, 5.38V, Channel 4 is EN, 5.5V.
No load
40mA load default
As you can see, the part is able to start up with EN pulled above 5V while VBAT is 0V.
Would you mine share your Vin, Vo and output current parameters? I think the part is ok to operate under your cases.
-Wenhao
