LM3490 datasheet(9/17 Pages) TI

9 / 17 page

LM3490

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SNVS012E – JUNE 1999 – REVISED APRIL 2013

APPLICATIONS INFORMATION

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 VIH threshold and 5.0V will enable the output voltage.

Pulling the ON/OFF pin voltage to a value between the VIL 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 VIL threshold and above the VIH 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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LM3490 Datasheet(PDF) 9 Page - Texas Instruments