LP2985 Datasheet, PDF (8/24 Pages) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

LP2985
150-mA LOW-NOISE LOW-DROPOUT REGULATOR
WITH SHUTDOWN
SLVS522F – JULY 2004 – REVISED AUGUST 2005
www.ti.com
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)
SHORT-CIRCUIT CURRENT
vs
OUTPUT VOLTAGE
320
V_O = 3.3 V
300
280
260
240
220
200
0
0.5
1 1.5
2
2.5
3 3.5
Output Voltage − V
Figure 5.
1200
1100
1000
GROUND-PIN CURRENT
vs
LOAD CURRENT
V_O = 3.3 V
C_byp = 10 nF
900
800
700
600
500
400
300
200
100
0
0 20 40 60 80 100 120 140 160
Load Current − mA
Figure 6.
RIPPLE REJECTION
vs
FREQUENCY
100
V_I = 5 V
90 _{VO = 3.3 V}
80
C_o = 10 µF
C_byp = 0 nF
70
1 mA
60
50 mA
50
40
150 mA
30
20
10
0
10
100
1k
10k
Frequency − Hz
Figure 7.
100k
RIPPLE REJECTION
vs
FREQUENCY
100
V_I = 3.7 V
90 _{VO = 3.3 V}
80
C_o = 10 µF
C_byp = 0 nF
70
1 mA
60
50 ^{50 mA}
40
30
150 mA
20
10
0
1M
10
100
1k
10k
100k
1M
Frequency − Hz
Figure 8.
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