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TMS570 Power Supply withTPS65381 in 5 Volt operation

Daniel Flueckiger
Prodigy 40 points

Other Parts Discussed in Thread: TPS65381-Q1

Hi

I would like to use the Multi-Rail Power Supply IC TPS65381 to supply the TMS570xx MCU .

In the Datasheet the input voltage range of the TPS65381 is specified as:
- 5.8V to 36 V (CAN, IO, MCU core and Sensor Supply regulators functional)
- 4.5V to 5.8V (3.3V IO and MCU core voltage functional)

Where can I find setup informations (application note) for the  TPS65381 in case of single 4.5V to 5.8V input voltage operation?

Thank's

Regards

Daniel

  • 0
    TI__Mastermind 22715 points

    Danial,

    You can find a detailed data sheet from the following link.

    http://www.ti.com/lit/ds/symlink/tps65381-q1.pdf

    This is all the information I can find.

    Thanks and regards,

    Zhaohong

  • 0 in reply to Zhaohong Zhang
    TI__Guru 59540 points

    Hello Daniel:

    Did the link to the datasheet help resolve your question? If so, please mark the answer as verified so we can close the thread and that others with similar questions can be confident in this answer.

  • 0 in reply to Chuck Davenport
    TI__Genius 13810 points

    The startup supply voltage must be higher than 5.8v, otherwise, it will not work.

    After the TPS65381 start working, you can drop down the supply voltage to 4.5v.

  • 0
    TI__Intellectual 1215 points

    Daniel,

    The TPS65381 needs at least 5.8V on VBATP pin for initial power-up. This is specified in parameter R1.1 in the datasheet.

    Due to internal device implementation, there is no way to work around this. The internal biasing of the device needs this initial 5.8V in order to start-up. Once this 5.8V has been applied once to VBATP, the voltage on VBATP is allowed to go down to 4.5V to keep VDD3 and VDD1 up and running. For automotive, this is no issue since even a weak battery is at least 7V. Only during engine-crank, the battery voltage could fall down to below 7V, but then the TPS65381 is already powered-up.

    So parameter R1.3 can only be met once parameter R1.1 has been satisfied. We will make this more clear in the next datasheet revision.

    One further remark, the TPS65381 is still in development, with RTM being scheduled for December this year. We do have EVMs and customer samples available at the moment. Application information/EVM manual will be provided by then.

    Best regards.

    Jacco van Oevelen

     

    System Engineer
    MixedSignalAutomotive

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