TPS6593-Q1: PMIC operation with 5V input

Hello Kallikuppa,

Kallikuppa Sreenivasa said:

Q.1

I have a customer using 5V as the input to the PMIC DC/DCs and  LDO12 and LDO4.

Do you see some concerns using 5V input.

There is a requirement on the LDOs, depending on their configuration and input voltage relative to the VCCA.

From below, if the the LDO is used as a traditional LDO, it is has the upper limit of the VCCA and should not be exceeded.

So a configuration of 3V3 of VCCA is not recommended to have a 5V PVIN for LDO[1/2/3/4].

The bypass (load switch) mode allows upto VCCA (3V3), or upto 3V6 on the PVIN for LDO[1/2/3/4].

Special consideration for using it in bypass mode, resistance for a given current pull:

Kallikuppa Sreenivasa said:

Q.2

Customer is using a DC/DC that is not controlled by the PMIC IO to sequence for generating SOC 3.3V SYS voltage..

Is there a startup delay associated with the PMIC for the output supplies to start ramping after the input is applied.

Yes, please see the following below from the datasheet, the specifications are also listed in the section 7.

The power sequence is highly dependent of the programming of the device.

From section 6 Pin Configuration and Functions: If the devices aren't being used, they still must have the PVIN attached to VCCA in order to pass the BOOT_BIST.

If you have any additional questions, please do ask away, this is quite a lot of information, so I expect as much.

Either way, have a wonderful day!

Best Regards,

Nicholas

Hello Kallikuppa,

For the nINT it's an open drain like you've said, as long as the nINT is pulled up to the proper power source, like in the datasheet below, the net tied to while drive the signal in the appropriate & expected manner.

As to the net to be tied, please check with the AM62A team for reassurance, as their software/hardware setup is something unfamiliar to myself how they handle hardware interrupts.

BR,

Nicholas