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TPS63020 Problem with consumption in low power (Power save mode enabled)

Alexis VERHAEGHE
Prodigy 120 points
Other Parts Discussed in Thread: TPS63020

Hi,

I made my own board with TPS63020.

I am using a 3,7V battery to supply the board.
The TPS63020 keeps output voltage to 3,8V in order to supply another module and a microcontroller

When my module and my microcontroller enter in Low Power Mode, TPS63020 load is only a few µA. I pulled PS/SYNCH pin to GND to be in power save mode enabled.

Nevertheless, my board consumes 8 mA instead of being below 1 mA (which is too much with a small battery).

It seems that TPS63020 consumes a lot, is it possible ? What would I have missed ?

You can see schematic for TPS63020 on my board ...

I hope you can help me ...

Regards

Alexis

  • 0
    TI__Guru**** 150930 points
    You should measure the actual output current and input current and actual output voltage and input voltage per this app note: www.ti.com/.../slva236.pdf

    You should also look at Vin and Vout with a scope to make sure they are steady.

    Finally, you can compare to the EVM to see if/how your circuit differs in performance. This points to a layout or BOM difference as the culprit.