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Original question:

TPS7A02: 5.0V Output option

TPS7A02: Problem with desired output voltage

Jahongir Dodokhonov
Prodigy 130 points
Part Number: TPS7A02

Hi team, 

What could be the problem behind the fact that I can't get more than 5 volts at the LDO (TPS7A2050PDBVR)  output with 5,8 volts at its input. The capacitors used at the input and output are 22uf mlcc. 

I managed to get 5,2 volts output when applying it in one of the devises, but when I followed the same conditions in another one, I only get 4,9 volts. 

Could you please advise a solution to this LDO behavior. 

  • 0
    TI__Mastermind 29260 points

    Hi Jahongir,

    This device is a fixed output linear regulator.  Based on the part number, your version is fixed 5V output.  If you need something other than 5V, you will need to use an adjustable LDO.  If you need an alternate device, please let me know your requirements (Vin, Vout, Iout) and we can review some options.

    Thanks,

    Stephen

  • 0
    Prodigy 130 points

    Hi Stephen,

    I know that it is fixed 5 volts LDO, but what does the 5,5 volts maximum output given in the datasheet mean?

    Regard, 

  • +1 in reply to Jahongir Dodokhonov
    TI__Mastermind 29260 points

    Hi Jahongir,

    The device is rated for Vin + 0.3V or 5.5V, whichever is smaller.  This is to prevent reverse current from flowing through the body diode of the internal MOSFET, which can potentially damage the device.  If Vin + 0.3V > 5.5V, then the 5.5V is the absolute maximum this device can handle on the output without damaging it.  This would likely be a limitation of the ESD protection on the pin.

    Thanks,

    Stephen