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TPS3606-33: VOUT Operation when VBAT <1.5V

gautam jotkar
Expert 1165 points
Part Number: TPS3606-33

We are using the TPS3606-33 part. The input is the Aux supply which provides VDD = 3.3V & we have battery backup of VBAT = 3.6V.

What we have observed is that; if VBAT is low <1.5V, and if VDD of 3.3V is applied, sometimes VOUT does not provide output of 3.3V.

What is the reason for this erroneous behavior of TPS3606?

  • 0
    TI__Genius 9375 points

    Hi Gautam,

    The reason for this is Vbat(min), as defined in the recommended operating conditions as shown below. You need to keep Vbat above 1.5V for proper response.

    Thanks,

    Abhinav.

  • 0 in reply to Abhinav.Sharma
    Expert 1165 points

    Hi Abhinav,

        we tested the design for Vbat= 0V earlier and didn't find any issue while Vdd comes back.

       Presently also, the problem can't be reproduced 100%, sometime it switches Vdd and sometimes not. When it doesn't switch then it is always in problem mode but if we give a repeated power ON / OFF  on Vdd then it starts connecting back, while Vbat = 0V and device boots in the normal mode.

      Why would the TPS3606 behave differently ?

      Thanks,

          Vinayak

  • 0 in reply to gautam jotkar
    TI__Genius 9375 points

    Vinayak,

    The officially supported value for minimum Vdd is 1.5 V. Past this, it could work, but it cannot be well defined and thus guaranteed.

    Thanks,
    Abhinav.