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TPS62162: What happens when connecting the output to voltages > set value

Bernhard Ratte
Prodigy 10 points
Part Number: TPS62162


Tool/software:

I have a uC circuit powered with a fixed 3.3V voltage. However during programming i want to supply the circuit with the programming adapter, which might deliver output voltages with slightly more than 3.3V (up to 3.5V). How would the TPS62162 behave when I connect this voltage to its output pin?

When supplying an output voltage it will travel over the body diode of the FET connecting SW and VIN and switching on EN. However, when FB>3.3V the SW-VIN FET should turn off (however there is still the body diode conducting) and the FET connecting SW-PGND might turn on.

My concern is that when the FET is switched on it drives enough current to GND to destroy either my programming device or the TPS62162.

So my question: Will the FET connecting SW to PGND turn on when I connect an output Voltage to the regulator output which is higher than its set value.

  • 0
    TI__Expert 3680 points

    Hello Bernhard

    The SW to PGND FET will not turn ON since the body diode will be reverse biased. Since the output voltage is regulated to 3.3V and the programming adapter is at 3.5V, the effect of the difference in output voltage will be seen on the output LED.

    Regards

    Nikhil