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TPS650250 Powered by Buck Converter

Matt Romney
Prodigy 140 points
Other Parts Discussed in Thread: TPS650250

In researching the PMIC's recommended for the AM335x MPU, the datasheet for the TPS650250 states that it is intended for use in Li-Ion powered systems. Is there any reason that it could not be connected directly to a buck converter with an output of 5VDC? The other two recommended PMIC's offer more features, at a higher cost, than is needed in our system so the TPS650250 is preferred. The only other concern I have would be, since the TPS650250 does not have a RTC, in case of power failure, would a cell battery be sufficient to keep the RTC on the AM335x running for an extended length of time. 

Thanks for the help.

  • 0
    TI__Genius 16870 points

    Hi Matt, 

    You can supply a 5VDC source to the VCC of the IC. The TPS650250 is the lowest cost option recommended by the processor team for the AM335x. However, it does not come with all of the functions that the other 2 options provide. Many customers don't need all of those functions like you and that is why the TPS650250 is such a good fit. I am not sure how long the RTC would run for until there is not enough power supplying it. What kind of time requirements are you looking for? I think you will probably have to get an EVM and test it out. 

  • 0 in reply to Michael Green
    Prodigy 140 points

    Michael,

    Thank you for the response. The system runs off of the mains and would need mains power to accomplish its primary function. So the only reason for the RTC is simply to keep time under complete power loss. The AM335x would never be put in the RTC-only mode. Power loss would happen whenever there is a mains outage. Could last for minutes to hours and very rarely days but it would obviously be infrequent. I would like to use a standard cell battery like the CR2032 which isn't rechargeable.

    Perhaps this question is better suited for the AM335x forum but I'm a little confused on how the AM335x RTC function would be connected to a cell battery. Do you know much about this?

    Thanks