TPS254900-Q1: IMON pin float if not used

Jared Becker

Genius 11505 points

Part Number: TPS254900-Q1

Hi Team,

It is acceptable for the IMON pin to be left floating if not used?

Thank you!

Jared

over 4 years ago

0 Michael Tan over 4 years ago

TI__Expert 8420 points

Hey Becker,

It suggest short this pin to ground if you don't use this pin.

0 Jared Becker over 4 years ago in reply to Michael Tan

TI__Genius 11505 points

Hi Michael,

Thank you for the quick reply. Should an resistor be placed between the pin and ground or is it acceptable to short the pin directly to ground with no resistance?

-Jared

0 Michael Tan over 4 years ago in reply to Jared Becker

TI__Expert 8420 points

Hi Jared,

You can short this pin directly to GND not need to add a resistor.

0 Jared Becker over 4 years ago in reply to Michael Tan

TI__Genius 11505 points

Hi Michael,

Thank you for your help on this! One more question for you.. tying the IMON pin directly to ground will increase current consumption in the device slightly. Therefore, are there any negative consequences from leaving the IMON pin floating if not used? What are the side effects of leaving the pin open?

Thank you,

Jared

0 Michael Tan over 4 years ago in reply to Jared Becker

TI__Expert 8420 points

Hi Jared,

This pin is use for internal feedback voltage sensing.

If you let this pin open, there will be noise sensitive. The pin current is very small less then 100uA. You should not consider the current consumption for this small current.

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TPS254900-Q1: IMON pin float if not used