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TPS62737 peaks currents observed at the input during sleep mode (low current consumption)

Vijay Talikoti
Prodigy 40 points
Other Parts Discussed in Thread: TPS62737

Hi,

The final product is for battery operated device where in the part TPS62737 is used for converting 3V to 2.1V. During current measurements we found that there are peaks of 10mA duration 100us for every 1ms in sleep mode(typical current is around 200uA to 500uA). But these peaks go away during wake-up mode (typical current is 20mA to 30mA). This is affecting the total average current consumed and hence the battery life. All the components selected are as per datasheet recommendation. Request to let us know about this abnormal behavior of the IC. In previous project we had used TPS62056DGSR and did not see any issues of this kind.

  • 0
    TI__Genius 13700 points
    Hello Vijay,

    I am curious about a few things.

    What does the output voltage look like at the same time when these current pulses appear?
    What happens if you reduce the output capacitance from 200uF down to ~30uF? (Overall I am not entirely sure why you have so much capacitance on both your input and your output)

    The reason why I ask these questions is that I am wondering if that what what is being observed on the input in the form of these current pulses in the converters efforts to recharge such a large bulk capacitance that might be self discharging on the output.

    Outside of that being a possible cause I will have to keep thinking.