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TPS65930 - Minimum voltage to power ON - Switch On event

Leon Sae-Ung
Expert 5460 points
Other Parts Discussed in Thread: TPS65930

Hi,

in paragraph 3.3 page 24 are described the minimum voltage required at the input of TPS65930. 

In case there is no switch at PWRON the datasheet is guarantying that  3V3 is the required input voltage to start up TPS65930 in any case.

But in case PWRON has a switch and is this switch is the cause of the switch ON event then the guaranteed minimum voltage is 3V2. Am I correct? In case yes could you please explain how sticking a switch at PWRON can help to move from a 3V3 minimum input voltage to 3V2?

Thanks a lot for your help to clarify this. 

  • 0
    TI__Genius 15100 points

    Hi,

    With PWRON switch the switch-on event is the negative edge on PWRON. When there is no switch on PWRON then the switch-on event is based off battery insertion (VBAT). Since the two logic implementations are different internally there are two different comparators checking the voltage levels and edges.

    I hope this satisfies your query.

     

    Regards,

    Gandhar.

     

  • 0 in reply to Gandhar Dighe
    TI__Expert 5460 points

    Hi,

    Ok so two different thresholds depending the switch on event.

    Could you please give the min, typ values for the threshold in case of PWRON is the swtich ON event? I guess the 3V2 specified in the data sheet is the max value.

    I would have had one more question: can we think about any means to have the TPS65930 starting at 3V1?

    Thanks.

  • 0 in reply to Leon Sae-Ung
    TI__Genius 15100 points

    Hi,

    For switch on event with PWRON switch typical voltage is 3.2V. There isnt a min/max specified for this. It is recommended that this voltage is available.

    You cannot power-up the device below 3.2V (Remember that the device will stay ON up to a minimum volatge of 2.7V).

     

    Regards,

    Gandhar.