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TPS51200-EP: calculating current stress and power dissipation

Michael T Schneider
Expert 3780 points
Part Number: TPS51200-EP

Team, 

I have questions on calculating current stress and power dissipation using TPS51200MDRCTEP on a DDR3 application and hope you can help me.

 If VLDOIN = +1.5V, REFIN = VO = +0.75V, VIN = +2.5V, and current out on VO = 375mA, would the power dissipation on the device be PD=0.375*0.75=.0281W and the input current at VLDOIN also be 0.375A since this is an LDO supply ?

 

What is the contribution through VIN? 

Does it supply current to Vtt? 

Would it be the Iin supply current 1 mA from the datasheet?

Thank you! 

  • 0
    TI__Genius 13870 points

    Michael, 

    Michael T Schneider said:
     If VLDOIN = +1.5V, REFIN = VO = +0.75V, VIN = +2.5V, and current out on VO = 375mA, would the power dissipation on the device be PD=0.375*0.75=.0281W and the input current at VLDOIN also be 0.375A since this is an LDO supply ?

    That is correct.

    Michael T Schneider said:

    What is the contribution through VIN? 

    Does it supply current to Vtt? 

    Would it be the Iin supply current 1 mA from the datasheet?

    VIN is only an input for the internal UVLO comparator; this is shown below as well as on Page 11 of the datasheet:

    The current from the VIN source Iin in the datasheet, 1mA, is for a no load condition. For a load of 0.375mA, Iin increases to 10mA.

    Thanks,

    Kadeem