What is the maximum current the VDD_SOC rail should be designed for? There is conflicting information at different places. The Hardware Design Guide (Rev. 2.3) and the datasheet (Rev. 6.1) both state a current of 2700 mA.
On the other hand, in the reference schematics (SCH-51943 PDF: SPF-51943), a table on page 10 states a required current of 1500 mA. The PMIC itself is configured in dual-phase mode, which could deliver up to 6A.
What is the correct maximum VDD_SOC current the PMIC needs to be designed for?
The PF9453 seems to be an option for powering the i.MX 93. This PMIC features only single-phase mode for the VDD_SOC with up to 2700 mA output current. Are there any limitations to using the PF9453 PMIC instead of the PCA9451 for powering the VDD_SOC rail? Can the i.MX 93 run with full performance and temperature range with the PF9453?
We know that the PF9453 does not support the extra buck converter for the VDDQ_DDR rail, and therefore, only LPDDR4 is supported. Are there any other known drawbacks to using the PF9453 instead of PCA9451?
Hello,
Is the PCA9451 older than the PF9453?
Yes, that is correct.
What is the reason you still see most i.MX 93 designs are equipped with the PCA9451, and not the PF9453?
Because PCA9451 was designed for i.MX93 and was released at the same time. PF9453 is focused for for Industrial, IoT, smart appliance, and portable applications where size and
efficiency are critical.
Best regards.
Hi @JorgeCas
Thank you for the quick response. Is the PCA9451 older than the PF9453? In other words, what is the reason you still see most i.MX 93 designs are equipped with the PCA9451, and not the PF9453?
Hello,
What is the maximum current the VDD_SOC rail should be designed for?
The maximum current of VDD_SOC in i.MX93 is 2700 mA.
On the other hand, in the reference schematics (SCH-51943 PDF: SPF-51943), a table on page 10 states a required current of 1500 mA. The PMIC itself is configured in dual-phase mode, which could deliver up to 6A.
This table shows the max output current of BUCK1/BUCK3 in dual-phase configuration (4000 mA), this is the output current from PMIC that is connected to VDD_SOC power rail of i.MX93.
What is the correct maximum VDD_SOC current the PMIC needs to be designed for?
It is 2700 mA, the dual phase configuration of BUCK1/BUCK3 in PCA9450 is enough to provide the current for this power rail since is able to provide up to 4000mA.
Are there any limitations to using the PF9453 PMIC instead of the PCA9451 for powering the VDD_SOC rail?
There are no limitations when using PF9453 instead of PCA9451 for powering the VDD_SOC rail.
The only limitation that I can see is use LPDDR4x, it will be more difficult since you do not have an additional BUCK regulator to provide 0.6V of VDDQ, you may need to add an additional regulator, this issue does not occur in PCA9451.
Can the i.MX 93 run with full performance and temperature range with the PF9453?
Yes, you can.
Are there any other known drawbacks to using the PF9453 instead of PCA9451?
No, there are no any other known drawbacks to using the PF9453 instead of PCA9451.
Best regards.