• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Subscribers 78 subscribers
  • Views 244 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F5326: 3.3-V LDO

MichRFT
Expert 2110 points
Part Number: MSP430F5326

Hello,

What is the quiescent current of the integrated 3.3-V LDO inside the MSP430F5326?

What is the current when no load?

Why is it ON at power on?

Best regards

Mich

  • 0
    TI__Guru 60361 points

    Hi MichRFT,

    There isn't a spec in the datasheet, which tells me it is not tested/measured in production so not sure.  I'll have to reach out to our product team in Asia to see if that information is available.

    I believe it is enabled by default for a scenario where 5v is the system power and the LDO output powers the MSP430.  You want the LDO on by default so the MSP will power up.  If you are providing a separate 3.3v from another source, then the LDO should be disabled.

  • 0 in reply to Dennis Lehman
    TI__Guru 60361 points

    Hi MichRFT,

    It's been a few days since I have heard from you so I’m assuming your question has been answered.
    If this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information.
    If this thread locks, please click the "Ask a related question" button and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

  • 0
    Expert 2110 points

    "I'll have to reach out to our product team in Asia to see if that information is available."

    I am still waiting for your answer

    Mich

  • 0 in reply to MichRFT
    TI__Guru 60361 points

    Hi MichRFT,

    60uA.

    See pg 51 of the MSP430F5529 datasheet.

  • 0 in reply to Dennis Lehman
    Expert 2110 points

    Hi Dennis,

    What about the MSP430F5326? There is nothing in its datasheet.

    60µA is not possible for the MSP430F5326, when this LDO is ON, the full current consumption is less.

  • 0 in reply to MichRFT
    TI__Guru 60361 points

    Hi MichRFT,

    I have reached out to our designers to get you an answer.

  • +1 in reply to Dennis Lehman
    TI__Guru 60361 points

    Hi MichRFT,

    Sorry it has taken a while to get this information.

    Ok, the spec is 60uA.  The F5326 is a non-USB derivative with the same internal 3.3v LDO as shown here.

    If you have the power system configured as shown in the NON-USB illustration and measuring the input current on the LDOin pin, then if the CPU is in a LPM3 mode (CPU, MCLK, SMCLK off) you should measure around 60uA.  What exactly do you measure?

    Can you provide details on your power system and how you are measuring your currents.  What is the application?

**Attention** This is a public forum