TPSM5D1806: EN1 and EN2 internal pull up resister

Akihisa Tamazaki

Part Number: TPSM5D1806

Hello team,

I believe that there is an internal pull up resister in EN1 and EN2 pins.
My customer would like to set EN pins to low when TPSM5D1806 power up. so they would like to use using pulll-sown resister.
In this situation, they have questions. Would l you please advise?

1) What is the resister value of internal pull up resister in EN1 and EN2?

2) Do the pull-up resisters connect to VIN?

Your advice is appreciated.

Best Regards,
Akihisa Tamazaki

over 2 years ago

+1 David_Daniels over 2 years ago

TI__Mastermind 19970 points

There is an internal current source on each EN pin. The current source is typically 1.4uA. The absolute maximum voltage rating of the EN pin is 6V

The voltage on the EN pin should be less than 6V. The current source uses an internal supply rail. If the EN is open, the pin is pulled up and will regulate.

Most hardware developers would used a n channel mosfet and connect the drain to the enable pin to disable the device during power up.

0 Akihisa Tamazaki over 2 years ago in reply to David_Daniels

TI__Genius 11485 points

David-san,

Thank you for your comment.
I understood.

Best Regards,
Akihisa Tamazaki

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TPSM5D1806: EN1 and EN2 internal pull up resister