TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299B – SEPTEMBER 2000 – REVISED MAY 2001
TYPICAL CHARACTERISTICS
TPS79030
TPS79030
OUTPUT SPECTRAL NOISE DENSITY
OUTPUT SPECTRAL NOISE DENSITY
vs
vs
FREQUENCY
FREQUENCY
1800
1600
1400
700
600
V = 4 V
I
V = 4 V
I
C
= 0.001 µF
I
= 50 mA
C
C
= 10 µF
(byp)
O
o
C
= 10 µF
= 0.1 µF
o
(byp)
C
= 0.01 µF
500
400
300
(byp)
1200
1000
800
C
= 0.1 µF
(byp)
I
O
= 1 mA
I
O
= 50 mA
600
400
200
100
0
200
0
100
1k
10k
100k
100
1k
10k
100k
f – Frequency – Hz
f – Frequency – Hz
Figure 9
Figure 10
ROOT MEAN SQUARED OUTPUT NOISE
OUTPUT IMPEDANCE
vs
vs
BYPASS CAPACITANCE
FREQUENCY
300
250
200
150
100
50
2
1.8
1.6
V = 4 V
I
C
= 10 µF
o
C
T
= 10 µF
= 25°C
o
J
1.4
1.2
1
0.8
V
= 3 V
O
I
O
= 1 mA
0.6
0.4
0.2
0
I
O
= 50 mA
1k
V
O
= 1.5 V
0
0.00001 0.0001
0.001
0.01
0.1
1
10
100
10k
100k
1M
C
– Bypass Capacitance – µF
(bypass)
f – Frequency – Hz
Figure 11
Figure 12
8
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