TPS745-Q1: If floating the EN pin, what will happen?

Bruce Zhang

Part Number: TPS745-Q1
Other Parts Discussed in Thread: TPS745

Hi TI expert,

We connect the TPS74501 EN pin to IOC IO without pull-up or pull-down, is it ok? If EN pin floating, what will happen? Thanks.

over 1 year ago

0 Edgar Acosta1 over 1 year ago

TI__Genius 12345 points

Hi Bruce,

Thank you for reaching out.

The TPS745-Q1 has an internal pull down when the EN signal is disabled. The EN can be connected to another signal when EN is required. If the EN is not needed, then tie this to VIN of the LDO.

Best,

Edgar Acosta

0 Bruce Zhang over 1 year ago in reply to Edgar Acosta1

Prodigy 50 points

Hi Edgar,

Thanks for your feedback.

As you say, TPS745 has an internal pull down. Refer to below screenshot, we don't need to add external pull down, right?

Best Regards

Bruce

0 Edgar Acosta1 over 1 year ago in reply to Bruce Zhang

TI__Genius 12345 points

Hi Bruce,

it is not needed, but there is no harm in placing one either. This is just design preference. Also, I noticed the capacitor installed on the EN. Our EN do not require a capacitor to be installed. We see RC to create an RC delay on the EN signal, but it is not required.

Best,

Edgar Acosta

0 Bruce Zhang over 1 year ago in reply to Edgar Acosta1

Prodigy 50 points

Got it. Thanks a lot.

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TPS745-Q1: If floating the EN pin, what will happen?