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SLVS351I – SEPTEMBER 2002 – REVISED MAY 2006
TYPICAL CHARACTERISTICS (continued)
TPS79630
ROOT MEAN SQUARED OUTPUT
NOISE
vs
BYPASS CAPACITANCE
RMS − Root Mean Squared Output Noise −
µV
RMS
60
50
40
V
DO
(mV)
200
150
100
I
OUT
= 250 mA
C
OUT
= 10 µF
BW = 100 Hz to 100 kHz
0.0047 µF
0.01 µF
0.1 µF
50
I
OUT
= 250 mA
0
−40−25 −10
5
20 35 50 65 80 95 110 125
T
J
(_C)
30
20
10
350
300
250
V
IN
= 2.7 V
C
OUT
= 10
µF
I
OUT
= 1 A
Ripple Rejection − dB
TPS79628
DROPOUT VOLTAGE
vs
JUNCTION TEMPERATURE
80
70
60
50
40
30
20
10
0
1
10
TPS79630
RIPPLE REJECTION
vs
FREQUENCY
V
IN
= 4 V
C
OUT
= 10 µF
C
NR
= 0.01 µF
I
OUT
= 1 mA
I
OUT
= 1 A
0
0.001 µF
100
1k
10k 100k
1M
10M
C
NR
(µF)
Frequency (Hz)
Figure 7.
TPS79630
RIPPLE REJECTION
vs
FREQUENCY
80
70
Ripple Rejection − dB
60
50
40
30
20
10
0
1
10
100
1k
10k 100k
1M
10M
Frequency (Hz)
I
OUT
= 1 mA
V
IN
= 4 V
C
OUT
= 10 µF
C
NR
= 0.1 µF
Ripple Rejection − dB
80
70
60
50
40
30
20
10
0
1
10
100
Figure 8.
TPS79630
RIPPLE REJECTION
vs
FREQUENCY
3
V
IN
= 4 V
C
OUT
= 2.2 µF
C
NR
= 0.01 µF
2.75
2.50
2.25
2
V
OUT
(V)
I
OUT
= 1 A
1.75
1.50
1.25
1
0.75
0.50
0.25
0
1k
10k 100k
1M
10M
Frequency (Hz)
0
100
200
C
NR
=
0.001
µF
V
IN
= 4 V,
C
OUT
= 10
µF,
I
OUT
= 1.0 A
Figure 9.
START-UP TIME
C
NR
=
0.0047
µF
Enable
I
OUT
= 1 mA
I
OUT
= 1 A
C
NR
=
0.01
µF
300
t (ms)
400
500
600
Figure 10.
TPS79618
LINE TRANSIENT RESPONSE
5
V
IN
(V)
4
3
2
40
∆V
OUT
(mV)
20
0
−20
−40
0
20 40 60 80 100 120 140 160 180 200
t (µs)
I
OUT
= 1 A
C
OUT
= 10
µF
C
NR
= 0.01
µF
dv
1V
+
ms
dt
6
Figure 11.
TPS79630
LINE TRANSIENT RESPONSE
2
I
OUT
(A)
1
0
−1
150
∆V
OUT
(mV)
75
0
−75
V
IN
= 3.8 V
C
OUT
= 10
µF
C
NR
= 0.01
µF
Figure 12.
TPS79628
LOAD TRANSIENT RESPONSE
V
IN
(V)
5
4
3
40
I
OUT
= 1 A
C
OUT
= 10
µF
C
NR
= 0.01
µF
dv
1V
+
ms
dt
di
1A
+
ms
dt
∆V
OUT
(mV)
20
0
−20
−40
0
20 40 60 80 100 120 140 160 180 200
t (µs)
−150
0
100 200 300 400 500 600 700 800 900 1000
t (µs)
Figure 13.
Figure 14.
Figure 15.
6
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