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Review about schematics of TPS62237

Inho Jeon
Expert 1452 points
Other Parts Discussed in Thread: TPS63051

Hi, All!

I attach a schematics file using TPS62237.

Refer to below.

 

Please, Review and comment  that schematics, ASAP.

Best regards,

Inho Jeon.

  • 0
    TI__Guru**** 150690 points
    Yes, this is a good copy of the recommended circuit in the D/S.

    But note that you will not always get 3.3Vout from a single lithium battery, because the battery voltage decreases as it is discharged. You need a buck-boost converter like TPS63051 for this.
  • 0 in reply to Chris Glaser
    Expert 1452 points
    Hi, Chris!

    Thank you for your reply.

    You mean TPS62237 is not proper for input source of lithium battery 3.7V , is that right?
    Please , tell me that reason specifically.

    Best regards,
    Inho Jeon.
  • 0 in reply to Inho Jeon
    TI__Guru**** 150690 points
    A '3.7V' lithium battery usually has a voltage between 3V and 4.2V depending on its state of charge. Obviously, you cannot get 3.3V out of a buck (step-down) converter with a 3V input. This usually limits your ability to discharge the battery fully because the 3.3V will not be in regulation with lower battery voltages.
  • 0 in reply to Chris Glaser
    Expert 1452 points

    Hi Chris!
    Thank you for your reply.
    You mean buck conveter is not proper ; characteristic of lithium battery unstable level is influenced to 3.3V out level unstable problem, is that right?
    So, buck-boost converter is proper to lithium battery source input device, Is that right?
    And, plaese let me TEXAS INSTRUMENT suitable converter simple designed like TPS62237.

    Best Regards,
    Inho Jeon.

  • 0 in reply to Inho Jeon
    TI__Guru**** 150690 points
    I'm not sure that I understand your question.

    My point is that you cannot just assume you have a fixed 3.7V source voltage. You have a battery. Any battery's voltage varies with its state of charge. It changes based on how much energy is in the battery. This certainly affects your power supply design.

    To get 3.3Vout from a lithium battery, most customers would use a buck-boost converter like TPS63051.