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TPS61022: Big Consumption Peak

Deco
Prodigy 140 points
Part Number: TPS61022


Tool/software:

Hi,

We have a device that is powered by a LiFePO4 battery. The device uses a modem, which means that we need 3.8V. Therefore, we decided to use a step-up from Vbat to 5V, and step-downs for the MCU (3.3V) and modem. The modem block is disconnected during these tests.

We are facing an issue of a large current pulse caused by MCU consumption change. It happens when the MCU is returning from Standby mode -> consumption on 3.3V rises from 0.5-2 µA to hundreds of mA. This causes an extreme current peak on Vbat, which is "un-welding" the cables from the battery.

What can we do?

Thanks in advance,
Vladislav

  • 0
    TI__Genius 12995 points

    Hi Vladislav,

    May I know what is the peak current value on Vbat?

    Generally there is a short inrush inductor current when load transient, will this current cause any problem in your application?

    The schematic and the layout looks ok.

    Regards,

    Nathan