Datasheet

90
80
70
60
50
40
30
20
10
PSRR(dB)
0 0.5 1 1.5 2 2.5 3
V (V)
DO
3.5
f=1kHz
f=10kHz
f=100kHz
f=1MHz
I =100mA
OUT
NoC
IN
90
80
70
60
50
40
30
20
10
PSRR(dB)
0 0.5 1 1.5 2 2.5 3
V (V)
DO
3.5
f=1kHz
f=10kHz
f=100kHz
f=1MHz
I =750mA
OUT
IN
NoC
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency (Hz)
Output Spectral Noise Density (µV/ Hz)
C
NR
= C
BYPASS
= 100 nF
C
NR
= C
BYPASS
= 470 nF
RMS Noise (100 Hz to 100 kHz)
24.09 µV
RMS
(C
NR
= C
BYPASS
= 100 nF)
23.54 µV
RMS
(C
NR
= C
BYPASS
= 470 nF)
V
IN
− V
OUT
= 0.5 V
C
IN
= 10 µF
C
OUT
= 10 µF
G200
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency (Hz)
Output Spectral Noise Density (µV/ Hz)
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
RMS Noise (100 Hz to 100 kHz)
25.89 µV
RMS
(V
OUT
= 1.8 V)
23.54 µV
RMS
(V
OUT
= 2.5 V)
23.54 µV
RMS
(V
OUT
= 3.3 V)
V
IN
− V
OUT
= 0.5 V
C
IN
= 10 µF, C
OUT
= 10 µF
C
NR
= 470 nF, C
BYPASS
= 470 nF
G201
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency (Hz)
Output Spectral Noise Density (µV/ Hz)
I
OUT
= 100 mA
I
OUT
= 750 mA
I
OUT
= 1 A
RMS Noise (100 Hz to 100 kHz)
23.54 µV
RMS
(I
OUT
= 100 mA)
23.71 µV
RMS
(I
OUT
= 750 mA)
22.78 µV
RMS
(I
OUT
= 1 A)
V
IN
− V
OUT
= 0.5 V
C
IN
= 10 µF, C
OUT
= 10 µF
C
NR
= 470 nF, C
BYPASS
= 470 nF
G202
0.01
0.1
1
10
100
10 100 1k 10k 100k
Frequency (Hz)
Output Spectral Noise Density (µV/ Hz)
C
OUT
= 10 µF
C
OUT
= 22 µF
C
OUT
= 100 µF
RMS Noise (100 Hz to 100 kHz)
23.54 µV
RMS
(C
OUT
= 10 µF)
23.91 µV
RMS
(C
OUT
= 22 µF)
22.78 µV
RMS
(C
OUT
= 100 µF)
V
IN
− V
OUT
= 0.5 V
C
IN
= 10 µF, C
OUT
= 10 µF
C
NR
= 470 nF, C
BYPASS
= 470 nF
G203
TPS7A8101
SBVS179A –DECEMBER 2011–REVISED APRIL 2012 www.ti.com
TYPICAL CHARACTERISTICS: TPS7A8101 (continued)
At V
OUT(TYP)
= 3.3 V, V
IN
= V
OUT(TYP)
+ 0.5 V or 2.2 V (whichever is greater), I
OUT
= 100 mA, V
EN
= V
IN
, C
IN
= 1 μF,
C
OUT
= 4.7 μF, and C
NR
= 0.01 μF; all temperature values refer to T
J
, unless otherwise noted.
POWER-SUPPLY RIPPLE REJECTION POWER-SUPPLY RIPPLE REJECTION
vs DROPOUT VOLTAGE vs DROPOUT VOLTAGE
Figure 20. Figure 21.
OUTPUT SPECTRAL NOISE DENSITY OUTPUT SPECTRAL NOISE DENSITY
vs FREQUENCY vs FREQUENCY
Figure 22. Figure 23.
OUTPUT SPECTRAL NOISE DENSITY OUTPUT SPECTRAL NOISE DENSITY
vs FREQUENCY vs FREQUENCY
Figure 24. Figure 25.
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