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LP3961 3,3V version output problems

tom hofacker
Prodigy 60 points
Other Parts Discussed in Thread: LP3961

I'm writing my master thesis in the field of electrical engineering and I've come across a small problem which is simply unclear to me.

I use a battery to power my microcontroller and I used a MCP1700 LDO to get a constant 3,3V supply ( data sheet pdf1.alldatasheet.com/.../MCP1700.html )

Because the current range didn't quite fit I have now switched to the LP3961 in the 3.3V version. Input and output are each connected with a 100uF capacitor as requested in the data sheet. ( Datenblatt www.ti.com/.../snvs056j.pdf

The problem:
the MCP makes clean 3.29V at the output everything as it should be...
The LP, however, gives me 3.59V and this not really clean, the LEDs on my microcontroller flicker and sometimes the whole thing hangs up.

What can be the solution here ? is the LP just broken ? I am really at the end of my knowledge, unfortunately I only have the one.

Hope someone has a tip

Translated with www.DeepL.com/Translator (free version)

  • 0
    TI__Mastermind 45070 points

    Hi Tom,

    Can you share your input voltage and peak load current for the LED? I do not have enough information to see what may be happening but as long as you are not violating the absolute maximum ratings of the device, you should not be able to damage the LDO. Without seeing the schematic, it is not easy to understand why you are seeing less than a perfectly regulated output voltage. Are you able to share your schematic? 

  • 0 in reply to JCHK
    Prodigy 60 points

    Thanks for the answere, i got help in another form.
    The problem was that the output capacitor was choosen wrong by me the ESR value was incorrect

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