LP2985 Datasheet, PDF (10/24 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)
OUTPUT NOISE DENSITY
vs
FREQUENCY
10
I_LOAD = 150 mA
OUTPUT NOISE DENSITY
vs
FREQUENCY
10
I_LOAD = 1 mA
1
C_byp = 100 nF
1
C_byp = 100 nF
C_byp = 1 nF
C_byp = 1 nF
0.1
C_byp = 10 nF
0.1
C_byp = 10 nF
0.01
100
1k
10k
Frequency − Hz
Figure 13.
INPUT CURRENT
vs
INPUT VOLTAGE
1.8
V_O = 3.3 V
1.6 ^Cbyp ^{= 10 nF}
R_L = 3.3 kΩ
1.4
1.2
1
0.8
0.6
R_L = Open
0.4
0.2
0
0
1
2
3
4
5
Input Voltage − V
Figure 15.
100k
6
0.01
100
1k
10k
Frequency − Hz
Figure 14.
1400
1200
GROUND-PIN CURRENT
vs
TEMPERATURE
V_O = 3.3 V
C_byp = 10 nF
150 mA
100k
1000
800
600
1 mA
400
0 mA
200
50 mA
10 mA
0
−50 −25 0
25 50 75 100 125 150
Temperature − °C
Figure 16.
10