Datasheet

Functional description L7981
14/44 Doc ID 15182 Rev 3
Figure 8. Over current protection strategy
5.5 Enable function
The enable feature allows to put in stand-by mode the device.With EN pin lower than 0.3 V
the device is disabled and the power consumption is reduced to less than 30 µA. With EN
pin lower than 1.2 V, the device is enabled. If the EN pin is left floating, an internal pull down
ensures that the voltage at the pin reaches the inhibit threshold and the device is disabled.
The pin is also V
CC
compatible.
5.6 Hysteretic thermal shutdown
The thermal shutdown block generates a signal that turns off the power stage if the junction
temperature goes above 150°C. Once the junction temperature goes back to about 130°C,
the device restarts in normal operation. The sensing element is very close to the PDMOS
area, so ensuring an accurate and fast temperature detection.