Datasheet

 
 
SLVS325C − MARCH 2001 − REVISED MAY 2002
www.ti.com
8
TYPICAL CHARACTERISTICS
Figure 19
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
= 1 µF
C
(byp)
= 0.01 µF
I
O
= 100 mA
I
O
= 10 mA
Figure 20
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
= 1 µF
C
(byp)
= 0.1 µF
I
O
= 100 mA
I
O
= 10 mA
Figure 21
60
50
30
20
10 100 1 k 10 k
70
90
100
100 k 1 M 10 M
40
80
Ripple Rejection − dB
f − Frequency − Hz
TPS79133
RIPPLE REJECTION
vs
FREQUENCY
V
I
= 4.3 V
C
o
= 10 µF
C
(byp)
= 0.01 µF
I
O
= 10 mA
I
O
= 100 mA
Figure 22
60
50
30
20
10 100 1 k 10 k
70
90
100
100 k 1 M 10 M
40
80
Ripple Rejection − dB
f − Frequency − Hz
TPS79133
RIPPLE REJECTION
vs
FREQUENCY
V
I
= 4.3 V
C
O
= 1 µF
C
(byp)
= 0.01 µF
I
O
= 10 mA
I
O
= 100 mA
Figure 23
TPS79133
RIPPLE REJECTION
vs
FREQUENCY
V
I
= 4.3 V
C
o
= 1 µF
C
(byp)
= 0.1 µF
I
O
= 10 mA
I
O
= 100 mA
60
50
30
20
10 100 1 k 10 k
70
90
100
100 k 1 M 10 M
40
80
Ripple Rejection − dB
f − Frequency − Hz
Figure 24
3
TPS79133
OUTPUT VOLTAGE, ENABLE VOLTAG
E
vs
TIME (START-UP)
V
O
t − Time − µs
0604020 80 100 140120 160 180 200
− Output Voltage − V
V
I
= 4.3 V
V
O
= 3.3 V
I
O
= 100 mA
C
o
= 1 µF
T
J
= 25°C
Enable Voltage − V
1
2
0
0
2
C
(byp)
= 0.001 µF
C
(byp)
= 0.01 µF
1
3
C
(byp)
= 0.0047 µF
Figure 25
3.8
TPS79118
LINE TRANSIENT RESPONSE
t − Time − µs
0302010 40 50 7060 80 90 100
2.8
10
0
V
O
− Output Voltage − mVV
I
− Input Voltage − V
−10
I
O
= 100 mA
C
o
= 1 µF
C
(byp)
= 0.01 µF
Figure 26
12 k600 800
V
O
Output Voltage − mV
∆
− Change In
t − Time − µs
TPS79118
LOAD TRANSIENT RESPONSE
−20
100
0 400200 1 k 14 k 16 k 18 k 2 k
Current Load − mA
20
V
I
= 2.8 V
C
o
= 10 µF
0
0
−40
Figure 27
20
TPS79133
LINE TRANSIENT RESPONSE
V
O
t − Time − µs
01510520253530 40 45 50
− Output Voltage − mV
I
O
= 100 mA
C
o
= 1 µF
C
(byp)
= 0.01 µF
V
I
− Input Voltage − V
0
5.3
4.3
−20
dv
dt
+
0.4 V
µs