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TLV1117LV: Inrush current limiting resistor question

Part Number: TLV1117LV

Is it safe to install a 10 ohm current limiting resistor between the voltage source and the part's Vin? The goal is to limit the inrush current to a few hundred milliamps during power up.

The input source voltage is 3.3V and the output capacitance is 1400 uF.

My concern is that the inrush current spike will cause the input voltage to droop below 2V and cause the part to dither on/off as the 3.3V supply ramps up.

My DC load current is less than 20 mA so I am not so concerned about the ~0.2V drop across the resistor during steady state operation.


  • Hi Anthony,

    It is safe to do this from the perspective that the LDO should not be damaged, so long as abs max values would not be exceeded.  You will probably see some small effect on the output as you have mentioned, but more than likely it will be minimal.  You will have to assess if any nonmonotonic startup is acceptable in your application, however.  I would recommend obtaining a TLV1117LV EVM and running your tests on that with your actual capacitors installed to verify operation meets your expectations.