LP2982_15 Datasheet, PDF (13/21 Pages) Texas Instruments – LP2982 Micropower 50 mA Ultra Low-Dropout Regulator in SOT-23 Package

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SCHOTTKY DIODE
LP2982
V_IN
PNP
LP2982
SNVS128J – MARCH 2000 – REVISED APRIL 2013
V_OUT
GND
Figure 40. Adding External Schottky Diode Protection
ON/OFF INPUT OPERATION
The LP2982 is shut off by pulling the ON/OFF input low, and turned on by driving the input high. If this feature is
not to be used, the ON/OFF input should be tied to V_IN to keep the regulator on at all times (the ON/OFF input
must not be left floating).
To ensure proper operation, the signal source used to drive the ON/OFF input must be able to swing above and
below the specified turn-on/turn-off voltage thresholds which ensure an ON or OFF state (see Electrical
Characteristics).
The ON/OFF signal may come from either a totem-pole output, or an open-collector output with pull-up resistor to
the LP2982 input voltage or another logic supply. The high-level voltage may exceed the LP2982 input voltage,
but must remain within the Absolute Maximum Ratings for the ON/OFF pin.
It is also important that the turn-on/turn-off voltage signals applied to the ON/OFF input have a slew rate which is
greater than 40 mV/μs.
IMPORTANT: The regulator shutdown function will not operate correctly if a slow-moving signal is applied to the
ON/OFF input.
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