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TPS1HB50-Q1: How to understand Vol-off of switch disabled

Meng Liu
Intellectual 1765 points
Part Number: TPS1HB50-Q1

Hi Expert

the Vol=3V, the describe of switch disabled protection as below:
 

I don't know why Vout exceed Vol when switch disabled. because Vol just 3v but Vout=vbat more than 3v.

also, how to enable 1Mohm? 

  • +1
    TI__Mastermind 21955 points

    Meng,

    For the HB series, the 1MΩ resistor is always present as it is internal. There is no way to disable it. The idea is that during the off-state with the 1MΩ internal pull-up there, if there is no open load or short to battery then the current actually going to the load through such a large resistance is negligible (in the microamp range). Most, if not all of the voltage will be dropped over the internal pull-up so you won't see a significant voltage on the output.

    If there is an open load or short-to-battery, essentially the only current path available is through the open-load detection circuit. In this case, the output voltage is going to be very close to the source voltage and the open load detection is going to trigger. 

    Timothy Logan
    Applications Manager - Power Switches