There was about 1mA leakage current on VLOG pin in Shutdown condition.
My customer did the test which add 3.3V to VLOG pin in device shutdown condition.
I observed same result.
My customer fears that 1mA is large value.
Please teach me this reason through internal circuit, if it is possible.
Now my customer is connecting VLOG to VREG2.
VLOG is the logic power supply for the part. It is connected to either VREG1 or VREG2 for normal operation. Both regulators will be on during normal operation. When the part is shutdown, both regulators and VLOG fall.
If a voltage is forced on VLOG after the part is shutdown, it will be trying to supply normal operating current to the part, plus bias current for paths which are not intended to be biased, so current will likely be higher than in normal operation. In the situation noted with VLOG connected to VREG2, reverse bias is applied to the VREG2 regulator. The recommended maximum VLOG voltage of 1.2 x VREG1 may be exceeded. Operation in this manner is not recommended.