Datasheet

TPS7301Q, TPS7325Q, TPS7330Q, TPS7333Q, TPS7348Q, TPS7350Q
LOW-DROPOUT VOLTAGE REGULATORS
WITH INTEGRATED DELAYED RESET FUNCTION
SLVS124F – JUNE 1995 – REVISED JANUARY 1999
30
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 32
30
10
0
Ripple Rejection – dB
40
50
f – Frequency – Hz
RIPPLE REJECTION
vs
FREQUENCY
60
20
10 100 1 K 10 K 100 K 1 M 10 M
T
A
= 25°C
No Input
Capacitance Added
V
I
= V
O
+ 1 V
I
O
= 100 mA
C
o
= 4.7 µF (CSR = 1)
TPS7333
TPS7301 With
V
O
Programmed
to 2.5 V
TPS7348/
TPS7350
Figure 33
10 100 1 k 10 k 100 k
C
o
= 10 µF (CSR = 1 Ω)
C
o
= 4.7 µF (CSR = 1 Ω)
C
o
= 100 µF (CSR = 1 Ω)
f – Frequency – Hz
OUTPUT SPECTRAL-NOISE DENSITY
vs
FREQUENCY
10
1
0.1
0.01
T
A
= 25°C
No Input Capacitance Added
V
I
= V
O
+ 1 V
Output Spectral-Noise Density –
V/
Hzµ
Figure 34
0.1
0.01
0 50 100 150 200 250
TYPICAL REGIONS OF STABILITY
COMPENSATION SERIES RESISTANCE (CSR)
†
vs
OUTPUT CURRENT
10
100
I
O
– Output Current – mA
CSR – Compensation Series Resistance – Ω
Region of Instability
1
T
A
= 25°C
V
I
= V
O
+ 1 V
C
o
= 4.7 µF
No Added Ceramic Capacitance
No Input Capacitance Added
Region of Instability
Figure 35
0.1
0.01
0 0.1 0.2 0.3 0.4 0.5
TYPICAL REGIONS OF STABILITY
COMPENSATION SERIES RESISTANCE (CSR)
†
vs
ADDED CERAMIC CAPACITANCE
10
100
Added Ceramic Capacitance – µF
0.6 0.7 0.8 0.9 1
1
T
A
= 25°C
V
I
= V
O
+ 1 V
I
O
= 500 mA
C
o
= 4.7 µF
No Input Capacitor Added
Region of Instability
Region of
Instability
CSR – Compensation Series Resistance – Ω