TPS22918: Why the pin of ON is always keeping low?

Lian Wu

Part Number: TPS22918
Other Parts Discussed in Thread: TPS22917

Dears:

Pls. kindly help to check the below schematic, and we let the TPS22918's on pin to connect GND signal for a moment, then disconnect GND signal for testing the performance.

And the pin of ON is always keeping low after the test.

And I find the Von can be -0.3V, why the pin of ON is always keeping low?

Pls. kindly help us!

Thanks a lot!

Best regards

Luck Wu

over 5 years ago

0 Aleksandras_Kaknevicius over 5 years ago

TI__Genius 15710 points

Hi Luck,

The TPS22918 does not have any pull up or pull down circuitry integrated into the ON pin. If the pin is left floating, then we do not guarantee high or low operation. From what you mentioned, you pulled the ON pin low to GND and left it floating. In this case, it is likely that the device will remain off, as you have observed. The ratings in the datasheet are the minimum and maximum ratings for the pin, not the voltage output expected.

Thanks,

Alek Kaknevicius

0 Lian Wu over 5 years ago in reply to Aleksandras_Kaknevicius

Genius 5250 points

Hi Alek:
Thanks for you support, I got it.
Btw, is there any PN about the solution has pull up or pull down circuitry integrated into the ON pin?
Thanks a lot!

Best regards
Luck Wu

0 Aleksandras_Kaknevicius over 5 years ago in reply to Lian Wu

TI__Genius 15710 points

Hi Luck,

The TPS22917 device has a smart ON pulldown resistance integrated into the ON pin of the device. You can read more about this feature in 8.3.1 of the datasheet.

Thanks,

Alek Kaknevicius

0 Lian Wu over 5 years ago in reply to Aleksandras_Kaknevicius

Genius 5250 points

Hi Alek：
Thank you very much, and we will evaluate it ASAP.
Thanks!

Best regards
Luck Wu

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TPS22918: Why the pin of ON is always keeping low?