The device turns on when all the following conditions are true:

• The supply voltage is greater than the positive-going undervoltage lockout (UVLO) threshold.
• The EN pin is high.

The device turns off when at least one of the following conditions is true:

• The supply voltage is less than the negative-going UVLO threshold.
• The EN pin is low.

A complete state diagram is shown in Figure 7-13.

After the device turns on, the internal reference system starts, then the trimming information and the CFG pins are read out. The device ignores any further changes to the CFG pins during device operation.

Figure 7-5 shows the internal start-up sequence.

Figure 7-5 Internal Start-Up Sequence