Can MMPF0100F0AEP VGEN6 supplies to VIN1?

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Can MMPF0100F0AEP VGEN6 supplies to VIN1?

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satoshishimoda
Senior Contributor I

Hi community,

I have a question about MMPF100F0AEP.

Actually, our partner consider using MMPF0100F0AEP VGEN6 (3.3V) for VGEN1 supply.

I think VGEN6 output voltage accuracy (+-3%) is good to supply VGEN1 (up to 3.40V input) since 3.3V * 103% = 3.399V.

And I think there is no timing issue since VGEN6 turn-on time is up to 500 us, it is sufficient to supply VGEN1 (SEQ=9) from VGEN6 (SEQ=8).

However, I have concern about start-up overshoot.

VGEN6's start-up overshoot(max) is 2.0%, so in worst case, VGEN6 voltage will be 3.3V * 103%(voltage accuracy) * 102% (start-up overshoot) = 3.47V.

It exceeds VIN1 input voltage (up to 3.4V).

On the other hand, in the case of SW4 which is used for VIN1 supply on SABRE-SD, it also exceeds VIN1 input voltage in worst case as following.

3.15V * 106% (in PWM mode) + 66mV (start-up overshoot) = 3.405V

So I'm confused by these calculation.

[Question]

Can we use VGEN6 to supply VIN1?

How should we judge whether each MMPF0100F0AEP output can supply to VIN1 or not?

Best Regards,

Satoshi Shimoda

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igorpadykov
NXP TechSupport
NXP TechSupport

HI Satoshi

one can use VGEN6 to supply VIN1, since

VIN1 is rated up to 3.6V, 3.40V is specified data for permanent

operation.

MMPF0100  p.8.jpg

Best regards

igor

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igorpadykov
NXP TechSupport
NXP TechSupport

HI Satoshi

one can use VGEN6 to supply VIN1, since

VIN1 is rated up to 3.6V, 3.40V is specified data for permanent

operation.

MMPF0100  p.8.jpg

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

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satoshishimoda
Senior Contributor I

Hi Igor,

Thank you for your reply.

OK, I understood it is no problem even though the input voltage exceed 3.40V momentarily.

Best Regards,

Satoshi Shimoda

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