Datasheet

  
   
SLVS167C − SEPTEMBER 1998 − REVISED − MAY 1999
16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 19
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)
3.3-V Regulator
Adjustable With
V
O
Programmed
to 2.5 V
Figure 20
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 21
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 22
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