LM3490IM5-12 Datasheet, PDF (9/17 Pages) Texas Instruments – LM3490 100 mA, SOT-23, Quasi Low-Dropout Linear Voltage Regulator with Logic-

LM3490
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APPLICATIONS INFORMATION
SNVS012E – JUNE 1999 – REVISED APRIL 2013
ON/OFF Pin
The LM3490 features a logic controlled ON/OFF pin that will allow the output voltage to be disabled, or enabled,
as needed. The defined operating voltage range for this pin is 0.0V to 5.0V. The ON/OFF pin can not be left
floating, as the output status cannot be ensured. Additionally, the ON/OFF pin should not be biased below
ground potential as unpredictable device behavior may occur.
Pulling the ON/OFF pin voltage to a value between the V_IH threshold and 5.0V will enable the output voltage.
Pulling the ON/OFF pin voltage to a value between the V_IL threshold and Ground potential will disable the output
voltage. Although the ON/OFF threshold is typically 725mV, and has no hysteresis, the ON/OFF signal must rise
and fall, cleanly and promptly, from voltage levels that are below the V_IL threshold and above the V_IH threshold.
The ON/OFF pin has no internal pull-up or pull-down to establish a default condition and, as a result, this pin
must be terminated, either actively or passively, to an appropriate voltage level.
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