LP38691-ADJ_16 Datasheet, PDF (11/27 Pages) Texas Instruments – 500-mA Low-Dropout CMOS Linear Regulators Stable

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7 Detailed Description
LP38691-ADJ, LP38693-ADJ, LP38691-ADJ-Q1, LP38693-ADJ-Q1
SNVS324K – JANUARY 2005 – REVISED JANUARY 2016
7.1 Overview
The LP3869x-ADJ devices are designed to meet the requirements of portable, battery-powered digital systems
providing an accurate output voltage with fast start-up. When disabled via a low logic signal at the enable pin
(EN), the power consumption is reduced to virtually zero (LP38693-ADJ only).
These LP3869x-ADJ devices perform well with a single 1-μF input capacitor and a single 1-μF ceramic output
capacitor.
7.2 Functional Block Diagrams
IN
P-FET
N/C
GND
-
ENABLE
+
LOGIC
THERMAL
SHUTDOWN
1.25-V
REFERENCE
MOSFET
DRIVER
FOLDBACK
CURRENT
LIMITING
P-FET
OUT
ADJ
Figure 26. LP38691 Functional Diagram (WSON)
IN
P-FET
-
EN
ENABLE
LOGIC
+
THERMAL
SHUTDOWN
1.25-V
REFERENCE
MOSFET
DRIVER
FOLDBACK
CURRENT
LIMITING
P-FET
OUT
ADJ
GND
Figure 27. LP38693 Functional Diagram (SOT-223, WSON)
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