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Original question:

TPS62160: Please help recommend that the function is similar to TPS62160, IQ needs less than 1uA

TPS62160: When the input voltage of TPS62160 is 3.53v, the current rises from 23uA to 2.5ma (no load). What is the problem?

user6229710
Prodigy 30 points
Part Number: TPS62160

  • 0
    TI__Guru**** 191445 points

    Yuanwei,

    With an input voltage of 3.54 A, the TPS62160 is enabled and switching.  The specification in the data sheet is for a non-switching condition.  When the TPS62160 is switching there are additional RMS switching currents even at no load.

  • 0 in reply to JohnTucker
    Prodigy 30 points

    HI

    That is to say, when the input voltage is 3.54v, the RMS switch will switch and generate additional current (even if no load). This is a normal phenomenon, right.

    Our smart door lock USES 4 AA dry batteries, which can work normally when the voltage is in the range of 3.5-6v. However, when the voltage is in the range of 3.5v, additional standby current (TPS62160 normally on mode) will be added, which will lead to the rapid depletion of the battery, which is unreasonable.

  • 0 in reply to user6229710
    TI__Guru**** 191445 points

    Yuanwei,

    If you are concerned about that you should set EN to low when Vin is 3.54 V.

  • 0 in reply to JohnTucker
    Prodigy 30 points

    John Tucker

                         Our input enablement is directly connected to the VCC, with no additional GPIO to control.Dc-dc step-down IC is normally open mode power supply (EN enables direct connection to VCC),Our application scenario is on the smart lock communication module.

  • 0 in reply to user6229710
    TI__Guru**** 191445 points

    Yuanwei,

    In your second waveform, you are operating in PWM mode.  That implies you are drawing significant load current.  Otherwise you would be in power saving skip mode.  I can check this further next week as we are on US holiday.