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MSP430F5310: MSP430F5310 LDO-PWR derating

Cruijff
Expert 2760 points
Part Number: MSP430F5310
Other Parts Discussed in Thread: MSP430F5510

Hi community member,

I received questions from my customers about maximum external current (ILDOO) of MSP430F5310 LDO-PWR.

Please let me confirm the following a question.

[Question]

Do you know the temperature range that ILDOO = 20mA(Max) is acceptable?

Is the maximum value of ILDO guaranteed in high temperature environment (maximum 85 ° C)considering Heat generation of junction-to-ambient thermal resistance?


Best regards.
Cruijff

  • 0
    TI__Guru 60361 points

    Hello Cruijff - thank you for reaching out with your question regarding the MSP430F5510.

    Based on the datasheet SLAS645J, section 5.44, looking at the USB LDO current overload detection, it should be possible to operate the LDO at the upper recommended operating temperature of 85C with an external current = 20mA.  This would also include the elevated junction temperature that may be generated at that load current.

  • 0 in reply to Dennis Lehman
    Expert 2760 points
    Hi James

    Thank you for your reply!
    It was a very good resource.

    Thanks and best regards,
    Cruijff
  • 0 in reply to Cruijff
    TI__Guru 60361 points
    Hi Cruijff,

    I wanted to inform you that my earlier response was incorrect. Specifically in regards to the maximum current the internal LDO can provide.
    If you refer to the previous post with the datasheet table, "IUSB_ext" is limited to only 12mA. So attempting to draw more than than will operate the device outside of its specification. However, if consuming less than the maximum 12mA, the LDO will work across the recommended operating range of -40C to +85C

    I apologize for any confusion this causes your customer.

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