LP8863-Q1: About Start-Up Sequence of VDD and VIN

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Guru 21045 points

Part Number: LP8863-Q1

Hi Team,

Does LP8863-Q1 have a start-up sequence of VDD and VIN?

I understand that LP8863-Q1 don’t have the limit of a start-up sequence.

So, case1 and case2 are good sequence.

-case1: VDD is applied after VIN is applied.

-case2: VIN is applied after VDD is applied.

Is my understanding correct?

If no, could you please let us know a recommended sequence?

Regards,

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over 5 years ago

0 Frank Qiu over 5 years ago

TI__Genius 15776 points

I think the sequence is case1, because when VDD is applied and Vin is no supply, LP8863 will trigger UVLO fault.

0 Hide over 5 years ago in reply to Frank Qiu

Guru 21045 points

Hi Frank-san,

Thank you for your prompt reply.

I have one more question.

Does LP8863 have a recommended wait time form VIN to VDD?

Regards,

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0 Frank Qiu over 5 years ago in reply to Hide

TI__Genius 15776 points

I think that based on the supply feature and the actual circuit.

Accturally speaking, Vin should up to UVLO therhold before EN pin enable, if the desgin satisfy that , i think there will be no problem with the vin and vdd sequence.

0 Hide over 5 years ago in reply to Frank Qiu

Guru 21045 points

Hi Frank-san,

Thank you for the information.

I understand that this device don't have a limit of sequence.

(So, there isn't wate time.)

Regards,

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0 Frank Qiu over 5 years ago in reply to Hide

TI__Genius 15776 points

OK if my answer has any help to you,please press this solve my issue button.

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LP8863-Q1: About Start-Up Sequence of VDD and VIN