LP38841_16 Datasheet, PDF (5/17 Pages) Texas Instruments – 0.8A Ultra Low Dropout Linear Regulators Stable

LP38841
www.ti.com
SNVS289C – DECEMBER 2004 – REVISED APRIL 2013
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified: T_J = 25°C, C_IN = 10 µF CER, C_OUT = 22 µF CER, C_BIAS = 1 µF CER,S/D Pin is tied to V_BIAS, V_OUT
= 1.2V, I_L = 10mA, V_BIAS = 5V, V_IN = V_OUT + 1V.
V_BIAS Transient Response
6
V_BIAS
Dropout Voltage Over Temperature
0.12
125^oC
0.10
V_BIAS = 5V
5
0.08
4
10
0.06
V_OUT
0
0.04
25^oC
-40^oC
I_L = 10 mA
-10
V_OUT = 1.2V
V_IN = 1.7V
20 Ps/DIV
Figure 3.
0.02
0
0
0.2
0.4
0.6
0.8
I_LOAD (A)
Figure 4.
1.55
V_OUT vs Temperature
1.54
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
-40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (^oC)
Figure 5.
100
90
80
70
60
50
40
30
20
10
0
1000
V_BIAS PSRR
C_OUT = 4.7 PF Tantalum
I_LOAD = 10 mA
10000
100000
FREQUENCY (Hz)
Figure 6.
1000000
100
90
80
70
60
50
40
30
20
10
0
100
V_BIAS PSRR
C_BIAS = 1 PF Tantalum
I_L = 0
V_OUT = 1.2V
1000 10000 100000 1000000
FREQUENCY (Hz)
Figure 7.
80
70
60
50
40
30
20
10
0
1000
V_IN PSRR
C_OUT = 4.7 PF Tantalum
C_BIAS = 1 PF Tantalum
I_L = 10 mA
10000
100000
FREQUENCY (Hz)
Figure 8.
1000000
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