In the datasheet on page 16 is mentioned:
All TPS6512x outputs are protected against a short circuit to ground. During steady-state operation, if the output
VMAIN, VGH or VGL falls below its fault detection threshold the device simultaneously turns off all three outputs.
Once VMAIN comes down to 700 mV typ, the GATE output is pulled to VIN, the auxiliary LDO (TPS65120/1/2) is
disabled and the device enters a shutdown state.
The auxiliary LDO present in TPS65120/1/2 has an integrated current foldback circuit for reliable short-circuit
protection.
The device can be enabled again by toggling the enable pins (RUN, EN) below 0.4 V or by cycling the input
voltage below the UVLO falling threshold (2.15 V typ).
But we cannot find what the value of this fault detection threshold is.
Can you give this value to me?
