PMIC MMPF0100 with 3.3V supply voltage

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

PMIC MMPF0100 with 3.3V supply voltage

Jump to solution
1,504 Views
martin-schad
Contributor I

In our new iMX6 design we want to use the MMPF0100 to control DDR3 supply voltage and CPU/SOC core voltage only,

e.g. we want to use it to generate output voltages below 2.8V only.

3.3V and 5V power rails are generated from a standard power supply because we need much higher output current then the

MMPF0100 can deliver. We will only use SW1A/B, SW1C, SW3, VGEN4 (1.8V) and VGEN5 (2.8V). Other switching regulators

and LDOs will be disabled in our software.


Is it possible to supply the MMPF0100 from 3.3V input voltage rail instead of 4.2V input voltage rail if it is only used to generate

output voltages up to around 1.5V (on switching regulators) and up to 2.8V (on LDOs, e.g. VGEN5) ?

Are their any known issues when using 3.3V input voltage (e.g. output load capability or efficiency) ?

Can we use the MMPF0100F0 version, if we disable unused regulators within boot loader/OS software?

Can you help me with this please?

Labels (1)
Tags (1)
0 Kudos
1 Solution
690 Views
reyes
NXP TechSupport
NXP TechSupport

Hi Martin Schad,

You should not have any problem using the MMPF0100 at 3.3V, just make sure that it is always more than 3.1V (UVDET threshold on rising) during the power-up and the complete device should work properly giving output voltages at 3.2V or less (the SWBST can still give you the 5.0 output voltage if enabled).

Yes, you can use the F0 version of the device, just be advice that after the first power up, the device outputs would be as mentioned on table 10 of the datasheet.


Have a great day,
Jose Reyes

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

View solution in original post

0 Kudos
2 Replies
691 Views
reyes
NXP TechSupport
NXP TechSupport

Hi Martin Schad,

You should not have any problem using the MMPF0100 at 3.3V, just make sure that it is always more than 3.1V (UVDET threshold on rising) during the power-up and the complete device should work properly giving output voltages at 3.2V or less (the SWBST can still give you the 5.0 output voltage if enabled).

Yes, you can use the F0 version of the device, just be advice that after the first power up, the device outputs would be as mentioned on table 10 of the datasheet.


Have a great day,
Jose Reyes

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

0 Kudos
690 Views
martin-schad
Contributor I

Thank you for the information. We'll try it.

Here is my short summary:

1. We make sure that the supply voltage of the PMIC is above 3.1V. Lets call is SYS_3V3.

2. We will connect unused switching regulators as Freescale recommends (VIN pins of the switching regulators to 3.3V with 100nF bulk cap to GND)

3. RESETBMCU will be configured as RESET (not POR) - but that is standard configuration for NP/F0 version

4. We'll check that all power rails are stable before RESETBMCU is deasserted.

5. VDDHIGH input of iMX6 is connected to SYS_3V3 (the same as PMIC input voltage)

6. iMX6 3.3V IO voltage is supplied by "switched" SYS_3V3 rail. Lets call it GEN_3V3.

7. The highside switch enables GEN_3V3 when VDD_SOC or VDD_DDR is stable (to meet power on sequencing reqs)

8. We control the rise time of the highside switch to be compatible with PMIC timing.

Best Regards,

Martin.

0 Kudos