TPS6521855: Power management forum

Kazuki Itoh

Part Number: TPS6521855
Other Parts Discussed in Thread: TPS65910A, , LP8733

Hi team,

AM335x PMIC (TPS65910A) has functionality which enables to start PMIC automatically when power-up without toggling soft switch (VMBHI_IT_MSK=0).

My customer would like to implement similar functionality to AM64x PMICs (TPS6521855+ LP873345).
Do you have any idea or solution to realize this functionality with AM64x PMICs?
My customer desires software configurable solution as well as TPS65910A.

Regards,
Itoh

over 2 years ago

0 Brenda Diaz over 2 years ago

TI__Mastermind 19756 points

Hi Itoh,

Thank You for using E2E! Just to make sure I understand the question in the previous message, the customer wants the PMIC to be automatically enabled when the supply is connected? If that is the case, then they can just connect the PWR_EN pin of the TPS6521855 to the power good of the pre-regulator that is supplying the PMIC.

I also wanted to highlight that our current 2-PMIC solution to power the AM64x processor includes TPS6521855 + LP873364. The technical documentation listed below have more details about the connections and device settings.

Using LP8733xx and TPS65218xx PMICs to Power AM64x and AM243x Sitara Processors

Powering the AM64xx With the LP8733xx PMIC

Thanks,

Brenda

0 Kazuki Itoh over 2 years ago in reply to Brenda Diaz

TI__Genius 9795 points

Hi Brenda-san,

Thank you for your suggestion.

But my customer persists to software configurable solution like TPS65910A.

Do you have any idea?

Regards,

Itoh

+1 Brenda Diaz over 2 years ago in reply to Kazuki Itoh

TI__Mastermind 19756 points

Hi Itoh,

TPS6521855 and TPS65910A are two different PMICs. For TPS6521855, it will require customers to toggle the enable pin. Once the PMIC is in active state, customers can use the ENABLE1 / ENABLE2 registers to manually enable or disable the rails.

Thanks,

Brenda

0 Kazuki Itoh over 2 years ago in reply to Brenda Diaz

TI__Genius 9795 points

Hi Brenda-san,

OK, understand.

My customer decided to add DIP switch to control PWR_EN.

My customer commented they could save the service and extra component cost if it has the software configurable automatic power-on enable.

Regards,

Itoh

0 Brenda Diaz over 2 years ago in reply to Kazuki Itoh

TI__Mastermind 19756 points

Hi Itoh,

Thanks for letting us know about the customer feedback regarding the enable/disable function of this PMIC. Just for your reference, more details about how the power-up sequence can be executed from different states can be found in the "Power-Up Sequencing" section of the datasheet. The "Mode of Operation Diagram" also shows the different conditions that can make the PMIC to transition from one state to the other.

Thanks,

Brenda