LPC MicrocontrollersのトピックRe: LDO_ENABLE to omit VDDCORE supply?

LDO_ENABLE to omit VDDCORE supply?

__marvin__ — Fri, 23 Apr 2021 16:39:39 GMT

Hi,

I'm currently designing a PCB utilizing the MIMXRT633SFVKB IC.
Because there are a lot of space restrictions on that PCB, I don't want to use a PMIC and further would like to leave VDDCORE unrouted. Instead I would like to make use of the internal LDO.

I'm wondering, if I understood the LDO_ENABLE pin correctly though.
Here's the description from the datasheet:

Does this mean that LDO_ENABLE will --once pulled up-- supply the needed voltage of 1v2 to the core unit? (Under the precondition that all other supplies are correctly provided)

Just for completeness sake, here's the relevant part of my schematic:

Hope to hear from you.

All the best,
marvin

Re: LDO_ENABLE to omit VDDCORE supply?

FelipeGarcia — Tue, 27 Apr 2021 18:25:05 GMT

Hi Marvin,

You are correct, however, you must place a 4.7 uF in the VDDCORE pin. Please check section 1.3 Power Sequencing of the datasheet. First section describes power sequence when using internal LDO instead of PMIC.

Best regards,

Felipe

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Re: LDO_ENABLE to omit VDDCORE supply?

__marvin__ — Wed, 28 Apr 2021 04:36:14 GMT

Hi Felipe,

thank you so much for your help!