LP3872, LP3875

SNVS227H – FEBRUARY 2003 – REVISED JANUARY 2015

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7 Detailed Description

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.

8

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