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TPS7H2201-SP: Level shift to negative GND reference

Anthony Cataldo
Prodigy 40 points
Part Number: TPS7H2201-SP

Can this device be configured so that the GND reference is between -3V and -5V, while Vin is 0V?

The current would flow from Vin (0V), through the device's back-to-back transistors, through the load and return through -3V (or -5V).

If so what, if any, special considerations should be made for level-shifting?

Thanks.

  • 0
    TI__Expert 7085 points

    Hi Anthony,

    What you're describing is feasible for this device. The IC only sees the difference between VIN and GND, so as long as the maximum differential of 7V between VIN in GND is not exceeded then it would be ok to lower VIN to 0V and have GND at a negative voltage. The EN, OVP, timer pins, and other inputs would all need to be referenced to the GND voltage instead of 0V. The maximum voltage differential between these pins and GND should also not be exceeded for these pins. In the case of the EN and OVP pins the threshold voltages would also need to be referenced to GND, which would impact which external voltages would be able to drive these pins.

    Would you be able to share a simple schematic showing how you would plan to configure the device? This would make it easier to review any additional considerations that may arise for this application.

    Thanks,

    Sarah