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TLV70033 LDO Heating Problem

Pranay Gupta
Prodigy 10 points
Other Parts Discussed in Thread: TPS54260, TLV700

Hi, 

I am using TLV70033 LDO in on of my design, where this LDO is used for powering MCU.

I have noticed many times my LDO heats up due to shorting of MCU power line.

I don't understand the reason behind the MCU shorting. As per my understanding LDO's overshoots nature might harm MCU.

In front of LDO it is powered by TPS54260 with 12V to 5V conversion and its 5V is given to LDO. At input side of LDO we have used 10uF and 0.1uf ceramic caps and at output side 0.1uF, 10uF and 47uF caps are kept.

Please help me out in debugging this problem.

  • 0
    TI__Guru 55940 points
    Hi Pranay,

    Linear regulators will allow as much current to flow from IN to OUT as the load demands up until the regulator's current limit is reached. As such, when your MCU demands higher current, the TLV700 will allow this current to flow. This additional current will cause the TLV700 to heat as the power dissipation increases. Keep in mind that Pd = (Vin - Vout) x Iout.

    In order to help debug, please provide a multichannel scopeshot showing Vin, Vout, Ven, and if possible Iout. In order to help debug, we need to be able to see the relationship between these rails at the LDO.

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Guru 55940 points
    Hi Pranay,

    Since it has been a week without a reply, I assume that this thread is resolved. If this is not correct, please feel free to post again.

    Very Respectfully,
    Ryan