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TPS4H160-Q1: Open load detection

PY (Pengyu) Song
Expert 5860 points
Part Number: TPS4H160-Q1

Hi team,

Q1 - in below table, -75uA means current going out of the pin (for negative current, most of TI datasheet defines this way), or current going into the pin? 

Q2 - in below table, the threshold is between 1.6V and 2.6V ==> I suppose the max pull-up resistor Rup,max = Vth,min/Isink,max = 1.6V/75uA =  21.3kohm ==> is this correct? i find it's a bit confusing to define V(ol,off) between 1.6V and 2.6V, i.e. which should be the worst case to calculate the maximum Rup customer need to choose to guarantee open load detection. 

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    TI__Mastermind 34925 points

    PengYu,

    For Q1 this is the current going into the output pin as it is specifically referring to the system in an off-state open load condition. Figure 29 in the datasheet might make this a bit more clear illustratively:

    For Q2 the V(ol,off) parameter that refers to the internal voltage reference that is used by the internal circuitry to detect the relevant off-state open load condition. It can be a range depending on various factors of the device, however you do not have to go to the extent of calculating worst case values here. In 8.3.6.2.2 of the datasheet we recommend using a pull-up resistance value of 20kΩ.