Datasheet

 
 
SLVS325C − MARCH 2001 − REVISED MAY 2002
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7
TYPICAL CHARACTERISTICS
Figure 10
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
100 1 k 10 k 100 k
I
O
= 1 mA
V
I
= 4.3 V
C
o
= 10 µF
C
(byp)
= 0.1 µF
I
O
= 100 mA
f − Frequency − Hz
Output Spectral Noise Density −
TPS79133
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
V/ Hzµ
Figure 11
100 1 k 10 k 100
k
I
O
= 0.1 µF
V
I
= 4.3 V
I
O
= 100 mA
C
o
= 10 µF
I
O
= 0.01 µF
f − Frequency − Hz
TPS79133
OUTPUT SPECTRAL NOISE DENSIT
Y
vs
FREQUENCY
I
O
= 0.001 µF
I
O
= 0.0047 µF
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Output Spectral Noise Density −
V/ Hzµ
Figure 12
RMS − Root Mean Squared Output Noise −
ROOT MEAN SQUARED OUTPUT NOIS
E
vs
BYPASS CAPACITANCE
(RMS)
Vµ
C
(bypass)
− Bypass Capacitance − µF
V
O
= 3.3 V
V
O
= 1.8 V
0
10
20
30
40
50
60
70
0.001 0.01
0.1
BW = 100 Hz to 100
kHz
Figure 13
V
I
= 4.3 V
C
o
= 10 µF
T
J
= 25°C
100 10 M10 1 k
f − Frequency − Hz
10 k
− Output Impedance −Z
o
Ω
TPS79133
OUTPUT IMPEDANCE
vs
FREQUENCY
100 k
I
O
= 100 mA
I
O
= 1 mA
0
0.5
1
1.5
2
2.5
3
1 M
Figure 14
0
10
20
30
40
50
60
70
80
−40−25 −10 5 20 35 50 65 80 95 110 125
I
O
= 100 mA
I
O
= 10 mA
T
J
− Junction Temperature − °C
− Dropout Voltage − mV
V
DO
TPS79133
DROPOUT VOLTAGE
vs
JUNCTION TEMPERATURE
V
I
= 3.2 V,
C
o
= 10 µF
Figure 15
0
10
20
30
40
50
60
70
80
90
100
0 0.02 0.04 0.06 0.08 0.1
T
J
= 125°C
T
J
= 25°C
T
J
= −40°C
I
O
− Output Current − A
TPS792133
DROPOUT VOLTAGE
vs
OUTPUT CURRENT
− Dropout Voltage − mV
V
DO
V
I
= 3.2 V
C
O
= 10 µF
Figure 16
0
20
40
60
80
100
120
2.5 3 3.5 4 4.5 5
T
J
= 125°C
T
J
= 25°C
T
J
= −40°C
I
O
= 100 mA
V
I
− Input Voltage − V
TPS79101
DROPOUT VOLTAGE
vs
INPUT VOLTAGE
− Dropout Voltage − mV
V
DO
Figure 17
2.2
2.7
3.2
3.7
4.2
4.7
1.5 2 2.5 3 3.5 4 4.5 5
T
J
= 125°C
T
J
= −40°C
T
J
= 25°C
V
I
= 3.2 V
C
o
= 10 µF
V
O
− Output Voltage − V
Minimum Required Input Voltage − V
MINIMUM REQUIRED INPUT VOLTAGE
vs
OUTPUT VOLTAGE
5.2
Figure 18
0
10
20
30
40
50
60
70
80
90
100 1 k 10 k 100 k 1 M 10 M
Ripple Rejection − dB
f − Frequency − Hz
TPS79118
RIPPLE REJECTION
vs
FREQUENCY
V
I
= 2.8 V
C
o
= 10 µF
C
(byp)
= 0.01 µF
I
O
= 100 mA
I
O
= 1 mA