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tps650250 unused LDO

burak balkuv
Intellectual 620 points
Other Parts Discussed in Thread: TPS650250

TPS650250 design we are only using LDO1, what is the recommendation for the unused LDO2 output and feedback pin?

thanks

  • 0
    TI__Genius 16870 points

    Hi Burak, 

    The TPS650250 does have a global ENABLE pin for LDO1 and LDO2. - You can not enable only LDO1 or LDO2

    So e.g. if you are only using LDO1 (LDO2 not needed in the application)  LDO2 will still be turned on with LDO1.

    In such a scenario I would recommend to connect a small ceramic output capacitor on the not used LDO output to make sure the output is stable.

    FB_LDOx can be directly connected to VLDOx - this way you save the external components for the feedback divider.

    In case both LDOs are not needed you can hardwire VIN_LDO, VLDO, FB_LDO and ENABLE_LDO to GND.