LM3880: Power Sequence Issue

Part Number: LM3880

Tool/software:

Team,

When LM3880MF-1AANOPB is used in below circuit, there is something wrong and doesn't work normally.

Could you help to check the schematic! is there any missing?

Sequence Device: LM3880MF-1AANOPB

Buck: TLV62569DBVR x3 

Failure waveform. Power sequence function doesn't work normally.

  • Hi

    The circuit seems ok. I would suggest to check the VCC(5V) and EN pin during the power up.

    The EN shall below ON threshold until VCC reaches 5V.

    I also suggest to probe FLAG1/2/3 when the problem occured.

    Regards

    Yihe