7.4 Device Functional Modes

7.4.1 Enable (EN)

The LP5910 may be switched to the ON or OFF state by logic input at the EN pin. A logic-high voltage on the EN

pin turns the device to the ON state. A logic-low voltage on the EN pin turns the device to the OFF state. If the

application does not require the shutdown feature, the EN pin must be tied to VIN to keep the regulator output

permanently in the ON state when power is applied

To ensure proper operation, the signal source used to drive the EN input must be able to swing above and below

the specified turnon or turnoff voltage thresholds listed in the Electrical Characteristics section under VIL and VIH.

A 1-MΩ pulldown resistor ties the EN input to ground. If the EN pin is left open, the internal 1-MΩ pulldown

resistor ensures that the device is turned into an OFF state by default.

When the EN pin is low, and the output is in an OFF state, the output activates an internal pulldown resistance to

discharge the output capacitance for fast turnoff.

LP5910

SNVSA91F – SEPTEMBER 2015 – REVISED APRIL 2021

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