TPS54561: use bias voltage on boot pin

Given Ding

Part Number: TPS54561

Hi Team,

just want to check with you if adding a 5.4V bias voltage on Boot pin through a diode is OK for normal operation or not.

The 5.4V power up before Vin and shut down before Vin. Thanks.

BRs

Given

0 Arief Hernadi over 4 years ago

Hi,

I think that should be ok, but just be aware of the maximum boot voltage limit for the pin

I can see that there is an app note similar to what you are trying to do

I would say that you should power the 5.4V up after you power the VIN

Thanks

-Arief

0 Given Ding over 4 years ago in reply to Arief Hernadi

Hi Arief,

Thanks for your reply.

one more question, why does the 5.4V up after Vin? It seems no difference from my perspective. Thanks.

BRs

Given

0 Given Ding over 4 years ago in reply to Given Ding

Hi Arief,

Any feedback? Thanks.

BRs

Given

0 Arief Hernadi over 4 years ago in reply to Given Ding

Hi Given,

For me it is just a precaution so that the external bias does not interfere with normal startup sequence of the IC.

Thanks

-Arief

0 Marshall_Beck over 4 years ago in reply to Arief Hernadi

I believe Arief was able to help you out here.

Let us know if this design requires more help.

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