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TPS61201: About UVLO pin@TPS61201

teritama
Expert 2155 points
Part Number: TPS61201

Hi team

i have a question.

In Pin Function table, It's said ''Must be connected to VAUX if not used''.

On the other hand, in the datasheet p1, UVLO pin is connected to Vin pin.

Why they are difference?

Best regards.

teritama

  • 0
    TI__Mastermind 46905 points

    Hi Teritama,

    connecting this pin to VIN means the UVLO is set to 0.25V. connecting it VAUX could lead to lower UVLO.

  • 0 in reply to Jasper Li
    Expert 2155 points

    Hi Li,

    Thank you for quick reply.

    We use this device in follow condition.

    Vin : 1.5V x 3 (use battery)

    Vout : 3.3V

    Iout : max50mA

    UVLO connected to Vin (not use UVLO)

    Connection between battery and Vin is controled by switch.

    In this condition, circuit short occurred at Vin to GND.

    I think this problem is caused by connect UVLO to Vin.

    Because, this short doesn't occurre when I set UVLO by divider resister.

    But, I think this connect is no problem from your answer.

    Do you have some information about cause of this problem?

    best regards,

    teritama

  • 0 in reply to teritama
    TI__Mastermind 46905 points

    Hi Teritama

    i think you should select a buck-boost converter, instead of boost converter for your application. as the VIN could higher or lower than VOUT depending of the battery status. a buck-boost could improve the efficiency a lot and the life time of the battery.

    could you share the VIN and VOUT waveform when the switch between the battery and the VIN turn on? 

    why do you add such a switch between the battery and the VIN.

  • 0 in reply to Jasper Li
    Expert 2155 points

    Hi Li,

    Thank you I understood.

    I will suggest back-boost converter to the customer.

    >could you share the VIN and VOUT waveform when the switch between the battery and the VIN turn on? 

    ⇒Sorry, we were only  asked a question by customer about this issue, so there is no waveform data.

    　I want you to share information only if there are some case like this.

    　

    >why do you add such a switch between the battery and the VIN.

    ⇒The purpose is to switch application ON/OFF.

    　

    best regards,

    teritama