imx8ulp rtc ldo bypass

[Cécile]

Hello everyone,

I am currently designing a board based on a imx8ulp, and my PMIC (PCA9450B) provides a 1.8V always-on power rail.

According to the schematics in the reference manual page751,  the internal RTC LDO must be powered via the VDD_BVAT42 pin.

Is it possible to bypass this regulator, by  directly connect my external +1.8V always-on rail to the LDO output (VDD_VBAT18_CAP),  leaving the input disconnected ?

Thank you for your help !

Cécile

[joanxie]

refer to the data sheet, VDD_VBAT42 must be powered and stable before all other supplies begin to ramp up. for more detailed information, pls refer to the data sheet