LP2985 Datasheet, PDF (12/24 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)
LINE TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
3.41
5.5
3.41
5.5
3.39
3.37
3.35
3.33
V_O = 3.3 V
C_byp = 10 nF
I_O = 150 mA
5
V_I
4.5
4
3.5
3.39
3.37
3.35
3.33
V_O = 3.3 V
C_byp = 0 nF
I_O = 1 mA
5
V_I
4.5
4
3.5
3.31
3.29
3.27
3.41
3.39
3.37
V_O
20 µs/div"
Figure 21.
LINE TRANSIENT RESPONSE
V_IN
3.35
3.33
V_O = 3.3 V
C_byp = 10 nF
I_O = 1 mA
3.31
V_O
3.29
3.27
100 µs/div"
Figure 23.
3
2.5
2
5.5
5
4.5
4
3.5
3
2.5
2
3.31
3.29
3.27
4
3
2
1
0
−1 ^{VO = 3.3 V}
C_byp = 0
I_O = 150 mA
−2
−3
−4
V_O
20 µs/div"
Figure 22.
TURN-ON TIME
V_O
V_ON/OFF
100 µs/div"
Figure 24.
3
2.5
2
10
8
6
4
2
0
12