LP38501-ADJ_15 Datasheet, PDF (19/27 Pages) Texas Instruments – LP3850x-ADJ, LP3850xA-ADJ 3-A FlexCap Low Dropout Linear Regulator for 2.7-V to 5.5-V Inputs

www.ti.com
10 Layout
LP38501-ADJ, LP38503-ADJ
SNVS522I – AUGUST 2007 – REVISED AUGUST 2015
10.1 Layout Guidelines
Good layout practices minimize voltage error and prevent instability which can result from ground loops. The
input and output capacitors must be directly connected to the device pins with short traces that have no other
current flowing in them (Kelvin connect).
The best way to do this is to place the capacitors very near the device and make connections directly to the
device pins via short traces on the top layer of the PCB. The regulator ground pin must be connected through
vias to the internal or backside ground plane so that the regulator has a single point ground.
The external resistors which set the output voltage must also be located very near the device with all connections
directly tied via short traces to the pins of the device (Kelvin connect). Do not connect the resistive divider to the
load point or DC error could be induced.
10.2 Layout Examples
EN
Pull-up
Resistor
IN
Input
Capacitor
R2
ADJ
R1
OUT
Output
Capacitor
Ground
Figure 29. LP38501-ADJ TO-263 Layout
N/C
IN
Input
Capacitor
R2
ADJ
R1
OUT
Output
Capacitor
Ground
Figure 30. LP38503-ADJ TO-263 Layout
Copyright © 2007–2015, Texas Instruments Incorporated
Submit Documentation Feedback
19
Product Folder Links: LP38501-ADJ LP38503-ADJ