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BQ25606: BQ25606 work abnormal

user5350137
Intellectual 520 points
Part Number: BQ25606

Hi Expert, 

I am using BQ25606, but it seems to work abnormal.

When I only connect battery to BQ25606 but no external VBUS input, VREGN has no voltage output, and the system has no output;

When I connect external VBUS input to BQ25606 first, then connect battery, VREGN has a voltage of 5V output, and the system output is normal. However, at this time, if I remove VBUS, the system output is still there. Is this a normal behavior for BQ25606? 

If it is a normal behavior for BQ25606, why the system can still get output without VBUS? 

If not, what can cause to this issue?

Thank you!

Rachel

  • 0
    TI__Genius 10385 points

    Rachel,

    This is a duplicate post. I have replied on your other thread below:

    I hope this resolves your issue,

    Ricardo

  • 0 in reply to Ricardo
    Intellectual 520 points

    Hi Ricardo,

    Thanks for your reply.

    However, my TVS pin is configured as section 8.3.6.4 and still find this issue, see below. Can you pls. help check what is wrong in my design? Thank you.

    Rachel

  • 0 in reply to user5350137
    TI__Expert 5590 points

    Rachel:

    Please see my comments below:

    I am using BQ25606, but it seems to work abnormal.

    When I only connect battery to BQ25606 but no external VBUS input, VREGN has no voltage output, and the system has no output;

    [HM] for this case, REGN has no output. But SYS should have output. Can you move any load at SYS before connect your battery.

    When I connect external VBUS input to BQ25606 first, then connect battery, VREGN has a voltage of 5V output, and the system output is normal. However, at this time, if I remove VBUS, the system output is still there. Is this a normal behavior for BQ25606? 

    [HM] This is normal. SYS is supplied from either VBUS or battery. When VBUS is removed, battery supplies SYS.

    If it is a normal behavior for BQ25606, why the system can still get output without VBUS? 

    If not, what can cause to this issue?

    [HM] This is normal. SYS is supplied from either VBUS or battery. When VBUS is removed, battery supplies SYS. That's how battery powered system works.