LP39542 Datasheet, PDF (31/58 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

7V Shielding
To shield LP39542 from high input voltages 6…7.2V the use
of external 2.8V LDO is required. This 2.8V voltage protects
internally the device against high voltage condition. The rec-
ommended connection is as shown in the picture below.
Internally both logic and analog circuitry works at 2.8V supply
voltage. Both supply voltage pins should have separate filter-
ing capacitors.
In cases where high voltage is not an issue the connection is
as shown below
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