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why is TPS6598x EN3V3SW's threshold only 1.2V?

Marvin Feng
Intellectual 1340 points

there is a concern: why EN3V3SW pin’s threshold is 1.2V. however, from the below block diagram: its threshold should be 3.3V+Vgsth.

How to understand the below architecture?

 

 

  • 0
    TI__Genius 16870 points

    Hi Marvin,

    There is the input TTL buffer that is not shown here in this diagram. The logic signal will then go to so kind of gate driver circuit that actually drives the load switch. The important thing here is that the EN3V3SW controls the load switch and there is no i2c override for it like there is for the regulators.