LM4128: LM4128 EN pin input impedance or input leakage current

Hello,

Thanks for your question!

The LM4128's enable pin input leakage current is about 2uA.

The LM4128 is an older device, and my recommendation would be to consider the newer REF4132:

https://www.ti.com/product/REF4132

Please find its enable pin characteristics below:

I hope this helps!

Best Regards,

Andrew Li

Hello,

Thanks for the update!

For 20mA output current, please consider the REF20xx device which has an enable pin and can supply this output current. The xx will denote your desired output voltage as shown in the datasheet below:

https://www.ti.com/lit/ds/symlink/ref2025.pdf

I hope this helps!

Best Regards,

Andrew Li

Hello sir Andrew

Thank you for your suggestion.

My circuit needs 3.3V. 

I try to design on REF2033.

Your advice helped my circuit design.
Thank you very much.

Best Regards,

Hello,

I'm very glad to hear!

If you have no further questions, I will close this thread. To reopen this thread, simply reply to this message.

Best Regards,

Andrew Li

Hello,

To close this thread, you can simply stop responding.

Have a great week!

Best Regards,

Andrew Li