Power connections for MCXN547VNLT1A

[KumarG]

Hi,

I am working on a project using MCXN547VNLT1A (LQFP Package)

I could not find any reference for power connections, for using LDO (with   LQFP Package)

All evaluation boards are using BGA package which has different pinout configuration for power section.

Based on datasheet I have designed below connections.

Request to evaluate if it ok.

Thanks & Regards

Kumar

[KumarG]

I have designed the board with the proposed power section and it did not work.

following were the observations

 1) No core voltage was detected.

2) RESET pin was always at LOW (0V)

3) Debug/SWD port was not working. 

I have modified circuit (as shown below) to use DC-DC mode (instead of LDO/Low cost mode)

now everything is working fine.

Regards

Kumar

[ZhangJennie]

Hi KumarG,

I suggest you checking MCXNx4x HW Design guide.

https://docs.nxp.com/bundle/UG10092/page/topics/power_configurations.html

Check Chapter of "Power configurations"

If using the core LDO, VDD_LDO_CORE must be powered. In packages with independent VDD_DCDC pin (BGA package), the pins VDD_DCDC and DCDC_LX should be grounded through a 10 KΩ resistor.

Hope this helps,

Jun Zhang

[KumarG]

Hi Jun Zhang,

as per document

• For packages where VDD_DCDC and VDD_LDO_SYS share a package pin (HLQFP100), to disable DCDC,
DCDC_LX must be floating, and your software must disable DCDC.

Is there any block diagram for LQFP package configuration, Image you have shared is for BGA.

Regards

Kumar

[ZhangJennie]

Hello KumarG,

Unfortunately, we don't have diagram for HLQFP100

Thanks,

Jun Zhang