LP2985 Datasheet, PDF (9/24 Pages) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

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LP2985
150-mA LOW-NOISE LOW-DROPOUT REGULATOR
WITH SHUTDOWN
SLVS522F – JULY 2004 – REVISED AUGUST 2005
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
C_IN = 1 µF, C_OUT = 4.7 µF, V_IN = V_OUT(NOM) +1 V, T_A = 25°C, ON/OFF Pin Tied to V_IN (unless otherwise specified)
RIPPLE REJECTION
vs
FREQUENCY
100
V_I = 5 V
90 _{VO = 3.3 V}
80
C_o = 4.7 µF
C_byp = 10 nF
70
60 ^{1 mA}
50
40 _{50 mA}
30
20
150 mA
10
0
10
100
1k
10k
Frequency − Hz
Figure 9.
100k
RIPPLE REJECTION
vs
FREQUENCY
100
90
V_I = 5 V
V_O = 3.3 V
80
C_o = 4.7 µF
C_byp = 10 nF
70
1 mA
60
10 mA
50
40 _{100 mA}
30
20
10
0
1M
10
100
1k
10k
100k
1M
Frequency − Hz
Figure 10.
OUTPUT IMPEDANCE
vs
FREQUENCY
10
C_i = 1 µF
C_o = 10 µF
V_O = 3.3 V
1
1 mA
10 mA
100 mA
0.1
OUTPUT IMPEDANCE
vs
FREQUENCY
10
C_i = 1 µF
C_o = 4.7 µF
V_O = 3.3 V
1
1 mA
10 mA
100 mA
0.1
0.01
0.01
0.001
10
100
1k
10k
100k
1M
Frequency − Hz
Figure 11.
0.001
10
100
1k
10k
Frequency − Hz
Figure 12.
100k
1M
9