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TPS72301DVBR with chip mark of T02I and T36 do not work. With a proper GND working plate and solder gun, I have successfully built a negative power supply of -2.75V with external resistors of 57.6K and 43.2K with T08I.

Jinlin Huang
Prodigy 10 points
Other Parts Discussed in Thread: TPS723

Why the negative power regulator TPS72301DBVR with chip marks of T02I or T36 do not work? With a proper GND working plate and solder gun, I have successfully built a negative power supply of -2.75V with external resistors of 57.6K and 43.2K for devices with marked as T08I. Does anybody have the similar problem? 

  • 0
    TI__Expert 3910 points

    Hello Jinlin,

    We do not have a TPS72301DVBR part, are you referring to TPS72301DBVR?

    Also, could you provide us with a bit more information to help debug? (e.g. partial layout, schematic, scope shots of VEN, VIN and VOUT, etc).

    Regards,
    Victor

  • 0 in reply to Victor Salomon
    TI__Expert 3910 points

    Jinlin,

    I looked up the part by the top side marking on TI's Part Look-Up Site and I noticed you mentioned three markings: and T08I, T02I and T36. Note that while T08I does refer to TPS72301DBVR, T02I and T36 do not. 

    T02I refers to the fixed 2.5 V version of TPS723 and T36 refers to the fixed 2.5 V version of TPS732.

    Regards,
    Victor

  • 0
    Prodigy 10 points

    We had a simliar problem, with the TPS72301DVBR with chip mark of T02I. Once we added the 57.6K and 43.2K we got the same result -2.75V.


    Is it possible the chip was labelled incorrectly?

    Was there maybe a batch that went through with the wrong marking?

    Thanks

    Joe

  • 0 in reply to Joseph Chehade
    TI__Guru 55940 points
    Hi Joe,

    We have not received any returns of mismarked TPS723 devices to date. It is recommended that you contact the authorized distributor that sold you the devices and initiate a return for the devices. Please note that they will request information such as the Date Code, picture of the reel label, etc.

    Very Respectfully,
    Ryan