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Original question:

LMZ21701: Converter failure

LMZ21701: Output not stable over time

Bryan Legnini
Prodigy 90 points
Part Number: LMZ21701

I am using the LMZ21701 regulator for 5V input with 3.3V output. When 5V input voltage is applied the regulator output voltage starts off at 3.3V but after about 1-5minutes the voltage fluctuates around 2.4-2.5V then eventually down to 0.7V. I can see my power indicator LED flickering on and off. I am using the circuit recommended by the Power Designer, see attached schematic.

Any ideas why it wont hold 3.3V with only 1 LED pulling about 15mA?

  • 0
    TI__Mastermind 48980 points

    Hi Byran,

    The schematic looks good. is the output current 15mA? Is there other load connecting to output? Did all the boards behavior same or just one board? Could you check the board's soldering and clean up the board with alcohol or water? If not working, please send me the layout file.

    Thanks,

    Nancy