Datasheet

TPS78825, TPS78833
SLVS382A – JUNE 2001 – REVISED JULY 2001
4
www.ti.com
TYPICAL CHARACTERISTICS
Figure 1
3.285
3.29
3.295
3.3
3.305
3.31
3.315
0 15 30 45 60 75 90 105 120 135 150
V
CC
= 4.3 V
T
J
= 25°C
– Output Voltage – V
OUTPUT VOLTAGE
vs
LOAD CURRENT
V
O
I
L
– Load Current – mA
Figure 2
3.27
3.275
3.28
3.285
3.29
3.295
3.3
3.305
3.31
3.315
3.2
–40 –25 –10 5 20 35 50 65 80 95 110 125
I
O
= 1 mA
I
O
= 150 mA
– Output Voltage – V
V
O
OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
T
A
– Free-Air Temperature – °C
V
CC
= 4.3 V
Figure 3
0
5
10
15
20
25
–40 –25 –10 5 20 35 50 65 80 95 110 125
I
O
= 1 mA
V
CC
= 4.3 V
T
A
– Free-Air Temperature – °C
Quiescent Current –
QUIESCENT CURRENT
vs
FREE-AIR TEMPERATURE
Aµ
I
O
= 150 mA
Figure 4
f – Frequency – Hz
1 k 10 k 100 k
I
O
= 1 mA
V
I
= 4.3 V
C
o
= 4.7 µF
C
(SR)
= 0.47 µF
100
I
O
= 150 mA
nV/
Hz
Output Spectral Noise Density –
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
0
100
200
300
400
Figure 5
20
40
60
80
100
0.001 0.01 0.1 1
RMS – Root Mean Squared Output Noise –
ROOT MEAN SQUARED OUTPUT NOIS
E
vs
SLEW RATE CAPACITANCE
(RMS)
Vµ
C
(sr)
– Slew Rate Capacitance – µF
V
I
= 4.3 V
V
O
= 3.3 V
I
O
= 150 mA
C
o
= 10 µF
BW = 200Hz to 100 kHz
Figure 6
V
I
= 4.3 V
C
o
= 4.7 µF
100 1 M10 1 k
f – Frequency – Hz
10 k
– Output Impedance –Z
o
Ω
OUTPUT IMPEDANCE
vs
FREQUENCY
0
1.6
1
2
0.2
1.4
0.4
1.8
0.6
1.2
0.8
100 k
I
O
= 150 mA
I
O
= 1 mA
Figure 7
0
50
100
150
200
–40 –25 –10 5 20 35 50 65 80 95 110 125
I
O
= 1 mA
I
O
= 150 mA
T
A
– Free-Air Temperature – °C
V
CC
= 3.2 V
– Dropout Voltage – V
DROPOUT VOLTAGE
vs
FREE-AIR TEMPERATURE
V
DO
Figure 8
1 M100 k10 k1 k100
Ripple Rejection – dB
f – Frequency – Hz
RIPPLE REJECTION
vs
FREQUENCY
90
80
70
60
50
40
30
20
10
V
I
= 4.3 V
V
O
= 3.3 V
C
o
= 10 µF
C
(SR)
= 0.47 µF
100
110
120
I
O
= 150 mA
I
O
= 1 mA
Figure 9
3
OUTPUT VOLTAGE, ENABLE VOLTAG
E
vs
TIME (START-UP)
V
O
t – Time – ms
0 300200100 400 500 700600 800 900 1000
– Output Voltage – V
V
I
= 4.3 V
V
O
= 3.3 V
I
O
= 150 mA
C
(SR)
= 0.47 µF
C
o
= 10 µF
T
J
= 25°C
Enable Voltage – V
1
5
0
0
2