LP2985 Datasheet, PDF (7/24 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
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)
3.345
3.335
OUTPUT VOLTAGE
vs
TEMPERATURE
V_I = 4.3 V
V_O = 3.3 V
C_i = 1 µF
C_o = 4.7 µF
I_O = 1 mA
3.325
3.315
3.305
3.295
−50 −25 _{0 25 50 75 100 125 150}
Temperature − °C
Figure 1.
DROPOUT VOLTAGE
vs
TEMPERATURE
0.45
0.4
V_O = 3.3 V
C_byp = 10 nF
150 mA
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
−50 −25
50 mA
0 25 50 75
Temperature − °C
10 mA
1 mA
100 125 150
Figure 2.
SHORT-CIRCUIT CURRENT
vs
TIME
0.5
0.45
0.4
V_I = 6 V
V_O = 3.3 V
C_i = 1 µF
C_byp = 0.01 µF
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
−500
0
500
1000
Time − ms
Figure 3.
1500
2000
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
−100
SHORT-CIRCUIT CURRENT
vs
TIME
V_I = 16 V
V_O = 3.3 V
C_i = 1 µF
C_byp = 0.01 µF
100
300
500
700
Time − ms
Figure 4.
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