LP38691-ADJ_16 Datasheet, PDF (13/27 Pages) Texas Instruments – 500-mA Low-Dropout CMOS Linear Regulators Stable

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LP38691-ADJ, LP38693-ADJ, LP38691-ADJ-Q1, LP38693-ADJ-Q1
SNVS324K – JANUARY 2005 – REVISED JANUARY 2016
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LP3869x-ADJ can provide 500 mA output current with 2.7 V to 10 V input. Adjustable output voltage in the
range of 1.25 V to 9 V. LP3869x-ADJ is stable with a 1-μF ceramic output capacitor. Typical output noise is
0.7 μV_RMS at frequencies from 10 Hz to 10 kHz. Typical PSSR is 55 dB at 1 kHz.
8.2 Typical Applications
V_IN
1 PF *
IN
OUT
LP38691
-ADJ
ADJ
GND
R2
V_OUT
R1
1 PF *
* Minimum value required for stability
Figure 28. LP38691-ADJ Typical Application
V_IN
V_EN
1 PF *
IN
OUT
LP38693
EN _-ADJ
ADJ
GND
R2
V_OUT
R1
1 PF *
* Minimum value required for stability
Figure 29. LP38693-ADJ Typical Application
8.2.1 Design Requirements
For typical LDO CMOS linear regulators , use the parameters listed in Table 1.
DESIGN PARAMETERS
Input voltage range
Output range
Output current
Output capacitor range
Table 1. Design Parameters
EXAMPLE VALUE
2.7 V to 10 V
Adjustable
500 mA (maximum)
1 µF
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