EUP7981-285NIR1 datasheet(9/10 Pages) EUTECH

Part #	EUP7981-285NIR1

Description	150mA Low-Noise LDO in SC-70

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Manufacturer	EUTECH [Eutech Microelectronics Inc]

Direct Link	http://www.eutechmicro.com

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9 / 10 page

EUP7981

DS7981 Ver1.0 Jan. 2008

9

On/Off Input Operation

The EUP7981 is turned off by pulling the VEN pin low,

and turned on by pulling it high. If this feature is not

used, the VEN pin should be tied to VIN to keep the

regulator output on at all time. To assure proper

operation, the signal source used to drive the VEN

input must be able to swing above and below the

specified turn-on/off voltage thresholds listed in the

Electrical Characteristics section under VIL and VIH.

Fast Start up

The EUP7981 output starts up after Vref voltage

reaches its final value (1.2V nomial). The start-up time

is determined by the time constant of the bypass

capacitor. The smaller the capacitor value., the shorter

the start-up time, but less noise gets reduced. As a

result, start-up time and noise reduction need to be

taken into design consideration when choosing the

value of the bypass capacitor.

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