AAT3215IGV-2.8-T1 AAT [Advanced Analog Technology, Inc.], AAT3215IGV-2.8-T1 Datasheet - Page 14

• Manufacturer Part Number: AAT3215IGV-2.8-T1
• Description: 150mA CMOS High Performance LDO
• Manufacturer: AAT [Advanced Analog Technology, Inc.]

Figure 2 shows the preferred method for the bypass
and output capacitor connections. For low output
noise and highest possible power supply ripple
rejection performance, it is critical to connect the
bypass and output capacitor directly to the LDO reg-
ulator ground pin. This method will eliminate any
load noise or ripple current feedback through the
LDO regulator.
14
DC INPUT
GND
DC INPUT
V
IN
GND
Figure 1: Common LDO Regulator Layout with C
V
IN
I
IN
I
IN
Figure 2: Recommended LDO Regulator Layout.
C
IN
C
I
RIPPLE
IN
R
TRACE
I
LOAD
V
EN
R
IN
I
I
RIPPLE
LOAD
TRACE
return + noise and ripple
V
EN
Regulator
IN
I
GND
return + noise and ripple
LDO
GND
Regulator
I
GND
I
LDO
BYP
GND
+ noise
150mA CMOS High Performance LDO
I
V
BYP
BYP
R
OUT
TRACE
only
V
BYP
R
Evaluation Board Layout
The AAT3215 evaluation layout follows the recom-
mend printed circuit board layout procedures and
can be used as an example for good application
layouts (see Figures 3, 4, and 5).
Note: Board layout shown is not to scale.
OUT
TRACE
I
LOAD
C
LOOP
GND
BYP
I
LOAD
BYP
C
R
C
Ripple Feedback Loop.
BYP
TRACE
BYP
R
TRACE
C
R
OUT
TRACE
C
R
OUT
TRACE
AAT3215
R
3215.2006.05.1.6
LOAD
R
LOAD