LP3872_15 Datasheet, PDF (8/28 Pages) Texas Instruments – LP387x 1.5-A Fast Ultra-Low-Dropout Linear Regulators

LP3872, LP3875
SNVS227H – FEBRUARY 2003 – REVISED JANUARY 2015
7 Detailed Description
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7.1 Overview
The LP387x linear regulators are designed to provide an ultra-low-dropout voltage with excellent transient
response and load/line regulation. For battery-powered always-on type applications, the very low quiescent
current of LP387x in shutdown mode helps reduce battery drain. For applications where load is not placed close
to the regulator, LP3875 incorporates a voltage sense circuit to improve voltage regulation at the point of load.
ERROR output pin of LP3872 can be used in the system to flag a low-voltage condition.
7.2 Functional Block Diagram
Figure 8. LP3872
Figure 9. LP3875
7.3 Feature Description
7.3.1 Shutdown (SD)
The LM387x devices have a shutdown feature that turns the device off and reduces the quiescent current to 10
nA, typical.
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