Other Parts Discussed in Thread: TPS65218, AM4376
Hi,
I'm currently designing a custom board using AM4376 processor. I'm thinking about using the TPS65218 PMIC to power every component on my board.
But I saw in the AM437x datasheet that there is a POWER SUPPLY sequencing. My configuration looks a lot like the one described page 127 : RTC disabled, I/Os voltage configured as 1.8V.
But as I need to power my board components, I am not using the default values for DCDC3, DCDC4 & LDO1. The 400mA that LDO1 provides are not enough. I need more power that's why I'm using DCDC4 as my main 1.8V power supply.
My custom configuration is the following one :
DCDC3 -> 1.2V (well, it's just like the default configuration)
DCDC4 -> 1.8V (the default one is 3.3V)
LDO1 -> 3.3V (the default one is 1.8V)
As you can see, the power supply sequencing is not the same anymore. The default first sequencing steps are :
LDO1 (1.8V) -> DCDC3 (1.2V) -> DCDC4 (3.3V).
Now, it is : LDO1 (3.3V) -> DCDC3 (1.2V) -> DCDC4 (1.8V).
I could change the sequence, but only once my board is up and running. I'm afraid of what could happen the first time I'm gonna boot my board. Is the processor going to work properly despite having a "wrong power supply sequence" ?
Thanks for any feedback you could provide !
