SLVSFZ1 December 2020 TPS27SA08-Q1
The device monitors the supply voltage VBB to prevent unpredicted behaviors in the event that the supply voltage is too low. When the supply voltage falls down to VUVLOF, the output stage is shut down automatically. When the supply rises up to VUVLOR, the device turns back on.
During an initial ramp of VBB from 0 V at a ramp rate slower than 1 V/ms, VEN pin will have to be held low until VBB is above UVLO threshold (with respect to board ground) and the supply voltage to the device has reliably reached above the UVLO condition. For best operation, ensure that VBB has risen above UVLO before setting the VEN pin to high.