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Original question:

TPS65220: TPS6522053 with VSYS=5V/PVIN_LDO1=5V/VSEL_SD=pulldown

TPS65220: TPS6522053 VSYSpor_rising & VSYSuvlo_falling

Thierry HAUSER
Intellectual 420 points
Part Number: TPS65220


Hello ,

I'm checking the behaviour of TPS6522053, especially related to VSYS rising & falling.

Into the datasheet are mentionned :

VSYSpor_rising [2.2V.... 2.5V]

VSYSuvlo_falling[2.175....2.25V]

So according the below state machine, the PMIC start on VSYS > VSYSpor_rising, and goes to OFF state when VSYS < VSYSpor_falling (I guess it means "uvlo_falling").

So my concern is the following, the lowest value of VSYSpor_rising (2.2V) is lower than the higher VSYSuvlo_falling (2.25V). This doesn't respect the hysteresis diagram.

Capture d'écran 2025-10-23 142350.png

Is it a datasheet errata ?

Should I understand : 

VSYSpor_rising [2.25V.... 2.5V]

VSYSuvlo_falling[2.175....2.2V]

And how to understand the value of hysteresis of 130mV?
Thanks for your help

 

 

  • 0
    TI__Genius 11537 points

    Hello Thierry, 

    Thank you for your inquiry, 

    Yes, this should say that it transitions to OFF state when VSYS < VSYSuvlo_falling , not "por_falling"

    The following diagram illustrates the relationship between POR and UVLO ranges:
     

    The 130 mV hysteresis value is given as a typical value, based upon our own measurements of the hysteresis between the actual POR and UVLO values. 
    Hysteresis will not be negative, and can generally vary between 10 mV and 250 mV. 

    Hope this helps to clarify

     Best Regards, 
    Sarah