LP3988: Can Power Good (PG) really not go above VDD?

awseg464ytgaw4gawv

Part Number: LP3988

When I look at the Absolute Maximums section, it says that PD must be the lesser of VIN + 0.3 V or 6 V.

Is actually this correct? This seems unusual for an open-drain power-good output, that it can't go above the input rail.

over 2 years ago

+1 Nick Butts over 2 years ago

TI__Mastermind 46425 points

Hi,

It does seem an odd requirement, but it could be due to an ESD diode on the PG pin or something like that. If you can allow me a couple business days I will see if I have the parts to test on the bench.

Regards,

Nick

0 Nick Butts over 2 years ago

TI__Mastermind 46425 points

Hi,

We don't have any of these devices in the office. Are you willing to wait 3-5 business days for parts to be delivered to me if I place an order for them?

Regards,

Nick

0 awseg464ytgaw4gawv over 2 years ago in reply to Nick Butts

Prodigy 120 points

Thanks so much for the offer to do that. I was able to make it work within the bounds of the limits so no need to test anymore!

I looked at some parts from various vendors, and this seemed to actually be a fairly common requirement (but not all).

0 Nick Butts over 2 years ago in reply to awseg464ytgaw4gawv

TI__Mastermind 46425 points

Great! Glad it worked out for you.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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LP3988: Can Power Good (PG) really not go above VDD?