LP2985 Datasheet, PDF (11/24 Pages) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

www.ti.com
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)
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
3.4
200
3.4
200
3.38
150
3.38
150
3.36
100
3.36
100
3.34
I_L
3.32
V_O = 3.3 V
C_byp = 10 nF
∆I_L = 100 mA
3.3
V_O
3.28
3.26
3.24
3.22
20 µs/div"
Figure 17.
50
0
−50
−100
−150
−200
−250
3.34
3.32
3.3
3.28
3.26
3.24
3.22
I_L
V_O = 3.3 V
C_byp = 10 nF
∆I_L = 150 mA
V_O
20 µs/div"
Figure 18.
50
0
−50
−100
−150
−200
−250
LOAD TRANSIENT RESPONSE
3.4
200
3.38
150
3.36
100
3.34
3.32
3.3
3.28
V_O = 3.3 V
C_byp = 0 nF
∆I_L = 150 mA
I_L
50
0
−50
V_O
−100
3.26
−150
3.24
−200
3.22
−250
20 µs/div"
Figure 19.
LINE TRANSIENT RESPONSE
3.41
5.5
3.39
3.37
3.35
3.33
V_O = 3.3 V
C_byp = 0 nF
I_O = 150 mA
5
V_I
4.5
4
3.5
3.31
V_O
3
3.29
2.5
3.27
2
20 µs/div"
Figure 20.
11