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TPS63060: tps63060

reza nouriyan
Prodigy 100 points
Part Number: TPS63060

Hi,

i am using TPS63060 regulator to provide 5v voltage as input of my 3.3v regulator (MIC5319). input voltage is coming from two Li-Ion batteries and have max value of 8.4v

everything works fine but some times output voltage drops less than 2 volts. as input voltage of MIC5319 drops, 3.3v voltage also drops and everything fails.

i am using schematic added in attachment.

when output voltage of TPS63060 drops (also PG is 0) if i disconnect batteries and connect them again or connect VAUX to VOUT for 500 ms everything goes well.

i think TPS63060 needs a shock to work properly but i can not find the reason of problem.

  • 0
    TI__Expert 5425 points
    Welcome to the forum.

    If the output voltage drops during operation this is most likely related to an overload condition. The device has a built in current limit function which protects the device and application. You can find more details for that in the datasheet, parameters are in section 7.5 and a description can be found in section 8.5.4.
    For further debugging it would be good to know input voltage, inductor current and output voltage measured with an oscilloscope at the time the output voltage goes low.

    Connecting VAUX to VOUT is not recommended. This may damage the device.
  • 0 in reply to Juergen
    Prodigy 100 points

    Dear Juergen

    Thanks you for your response. current consumption of my design is less than 10 mA in 99% of time and i have some Instantaneous current flow less than 500 mA.

    so i don't think that problem is related to current peaks.

    i also tested the over voltage and over current protectors by connecting Vout to GND for less than 500 ms but everything goes well (Regulator limited current to 100 mA and after i disconnected Vout from GND, TPS63060 regulated Vout properly)

  • 0 in reply to reza nouriyan
    TI__Expert 5425 points
    It is good to know that the circuit works as expected at nominal operating conditions. The way you describe the problem still indicates to me that the device gets into an overload condition. There can be several reasons for that. Unfortunately without measurement data I just can continue guessing.
    In addition to measurement data, I have some more questions:
    What type of batteries are you using during this test?
    Did you try to duplicate the problem with a power supply connected at the input?
    Did you check device temperature at the time the problem occurs?