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TPS27081A: isolation between input and output

TS Yang
Genius 4800 points
Part Number: TPS27081A

Dear TI,

Below is the load switch circuit. (Please refer to the external pin reference because the IC internal circuit is wrong.)


The input is (4pin) 3.8V and the ON/OFF (5pin) is OFF state Low (0V). (6pin also 3.8V)
In this state, 1.15V is output as the output pin (2,3pin).
I am asking TI to confirm that the input and output are not completely blocked.

thanks,

TS

  • 0
    TI__Genius 15780 points

    Hi TS,

    The TPS27081 does not have any QOD (quick output discharge), so when the device is off, the output is left floating. The switch does have some minor leakage from VIN to VOUT, but this is due to MOSFET parasitics. Because of all of this, and because there is no pulldown on VOUT, C2 will not discharge down to 0V. If a load was added to VOUT, then the output would drop to 0V. This device does not have any isolation, but when the FET is off, VIN will not be able to power VOUT.

    Thanks,

    Alek Kaknevicius