LP2985_15 Datasheet, PDF (8/29 Pages) Texas Instruments – 150-mA Low-noise Low-dropout Regulator With Shutdown

LP2985
SLVS522O – JULY 2004 – REVISED JANUARY 2015
www.ti.com
Typical 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)
1200
1100
1000
V_O = 3.3 V
C_byp = 10 nF
900
800
100
90
V_I = 5 V
V_O = 3.3 V
80
C_o = 10 mF
C_byp = 0 nF
70
1 mA
50 mA
700
60
600
50
500
400
300
200
100
0
0 20 40 60 80 100 120 140 160
Load Current − mA
Figure 7. Ground Pin Current vs Load Current
40
150 mA
30
20
10
0
10
100
1k
10k
100k
1M
Frequency − (Hz)
Figure 8. Ripple Rejection vs Frequency
100
V_I = 3.7 V
90 _{VO = 3.3 V}
80
C_o = 10 mF
C_byp = 0 nF
70
1 mA
60
100
90
V_I = 5 V
V_O = 3.3 V
80
C_o = 4.7 mF
C_byp = 10 nF
70
60 ^{1 mA}
50 ^{50 mA}
50
40
30
150 mA
20
10
40 _{50 mA}
30
20
150 mA
10
0
10
100
1k
10k
100k
1M
Frequency − (Hz)
Figure 9. Ripple Rejection vs Frequency
100
90
V_I = 5 V
V_O = 3.3 V
80
C_o = 4.7 mF
C_byp = 10 nF
70
1 mA
60
10 mA
50
0
10
100
1k
10k
100k
1M
Frequency − (Hz)
Figure 10. Ripple Rejection vs Frequency
10
C_i = 1 mF
C_o = 10 mF
V_O = 3.3 V
1
1 mA
10 mA
100 mA
0.1
40 _{100 mA}
30
0.01
20
10
0
10
100
1k
10k
100k
1M
Frequency − (Hz)
Figure 11. Ripple Rejection vs Frequency
0.001
10
100
1k
10k
100k
1M
Frequency − (Hz)
Figure 12. Output Impedance vs Frequency
8
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