Datasheet

LP3988
SNVS161D –OCTOBER 2001–REVISED MAY 2013 www.ti.com
On/Off Input Operation
The LP3988 is turned off by pulling the V
EN
pin low, and turned on by pulling it high. If this feature is not used,
the V
EN
pin should be tied to V
IN
to keep the regulator output on at all time. To assure proper operation, the
signal source used to drive the V
EN
input must be able to swing above and below the specified turn-on/off voltage
thresholds listed in the Electrical Characteristics section under V
IL
and V
IH
.
Fast On-Time
The LP3988 utilizes a speed up circuitry to ramp up the internal V
REF
voltage to its final value to achieve a fast
output turn on time.
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