Datasheet

0.01
0.1
1
10
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Output Noise (uV/rtHz)
I
OUT
= 10 mA
I
OUT
= 100 mA
I
OUT
= 500 mA
I
OUT
= 1 A
RMS Noise (100 Hz to 100 kHz)
9.0 µV
RMS
(I
OUT
= 10 mA)
8.9 µV
RMS
(I
OUT
= 100 mA)
8.9 µV
RMS
(I
OUT
= 500 mA)
8.9 µV
RMS
(I
OUT
= 1 A)
G011
0.01
0.1
1
10
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Output Noise (uV/rtHz)
C
OUT
= 10 µF
C
OUT
= 47 µF
C
OUT
= 100 µF
RMS Noise (100 Hz to 100 kHz)
8.3 µV
RMS
(C
OUT
= 10 µF)
8.3 µV
RMS
(C
OUT
= 47 µF)
8.9 µV
RMS
(C
OUT
= 100 µF)
G012
800
1000
1200
1400
1600
1800
−40 −25 −10 5 20 35 50 65 80 95 110 125
Temperature (°C)
I
LIM
(mA)
V
LDOIN
= 2.2 V
V
LDOIN
= 3.8 V
V
LDOIN
= 5.5 V
V
LDOIN
= 6.5 V
G009
0.01
0.1
1
10
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
Output Noise (uV/rtHz)
C
NR
= 0.01 µF
C
NR
= 0.1 µF
C
NR
= 1 µF
RMS Noise (100 Hz to 100 kHz)
8.9 µV
RMS
(C
NR
= 0.01 µF)
8.9 µV
RMS
(C
NR
= 0.1 µF)
8.9 µV
RMS
(C
NR
= 1 µF)
G010
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3 3.5
V
DO
(V)
PSRR (dB)
f = 1 kHz
f = 100 kHz
f = 1 MHz
f = 10 MHz
I
OUT
= 1 A
G007
0
10
20
30
40
50
60
70
80
90
100
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
PSRR (dB)
I
OUT
= 100 mA
I
OUT
= 500 mA
I
OUT
= 1 A
G008
TPS54120
SBVS180C –JANUARY 2012–REVISED JUNE 2012 www.ti.com
TYPICAL CHARACTERISTICS (continued)
At V
(PVIN)
= V
(VIN)
= 12 V, V
(LDOIN)
= DC-DC_OUT = 4.1 V, V
(OUT)
= 3.3 V, I
(OUT)
= 10 mA, V
(EN)
= floating, C
OUT
= 100 μF, and
C
SS
= C
NR
= 0.01µF (see Figure 28), unless otherwise noted.
POWER-SUPPLY RIPPLE REJECTION POWER-SUPPLY RIPPLE REJECTION
vs LDO DROPOUT VOLTAGE vs FREQUENCY
Figure 7. Figure 8.
LDO OUTPUT CURRENT LIMIT OUTPUT SPECTRAL NOISE DENSITY
vs TEMPERATURE vs FREQUENCY
Figure 9. Figure 10.
OUTPUT SPECTRAL NOISE DENSITY OUTPUT SPECTRAL NOISE DENSITY
vs FREQUENCY vs FREQUENCY
Figure 11. Figure 12.
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