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LMG3410R070: LMG3410R070

Part Number: LMG3410R070
Other Parts Discussed in Thread: ISO722

While using the GanFET at Half- Bridge configuration, we started getting random Fault signals and FET Shuts down

After further investigation we found out that fault caused by the Half Bridge Lower FET 5V LDO under voltage condition  (picture below)

During fault we measured the 5V LDO sink about 10mA (2mA is normal current)

We could stop the fault condition by providing external regulated 5V into the LDO output.

This Half bridge topology is a standard design used in other circuit, it is only in this specific design were it happens in multiply boards. 

1. Any idea for the  reason of this behavior

2. Does using external Reg for 5V LDO acceptable solution 

3. Can we do a long term damage if we continue working with Ext 5V or 10mA sink current 

Appreciate your support

Ziv