Datasheet

TPS71025
LOW-DROPOUT VOLTAGE REGULATOR
SLVS162A – MAY 1997 – REVISED MAY 1998
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1
0.1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
10
100
Added Ceramic Capacitance – µF
Region of Instability
Region of Instability
TYPICAL REGIONS OF STABILITY
COMPENSATION SERIES RESISTANCE
vs
ADDED CERAMIC CAPACITANCE
V
I
= 3.5 V
No Input Capacitance
I
O
= 500 mA
C
o
= 4.7 µF
T
A
= 25°C
Compensation Series Resistance – ΩCSR –
Figure 10
1
0.1
0 50 100 150 200 250 300
TYPICAL REGIONS OF STABILITY
†
COMPENSATION SERIES RESISTANCE
vs
OUTPUT CURRENT
350 400 450 500
10
100
I
O
– Output Current – mA
Region of Instability
V
I
= 3.5 V
No Input Capacitance
C
o
= 10 µF
No Ceramic Capacitance
T
A
= 25°C
Compensation Series Resistance – ΩCSR –
Figure 11
1
0.1
0 50 100 150 200 250 300
TYPICAL REGIONS OF STABILITY
†
COMPENSATION SERIES RESISTANCE
vs
OUTPUT CURRENT
350 400 450 500
10
100
I
O
– Output Current – mA
Region of Instability
V
I
= 3.5 V
No Input Capacitance
C
o
= 10 µF + 0.5 µF of
Added Ceramic Capacitance
T
A
= 25°C
Compensation Series Resistance – ΩCSR –
Figure 12
1
0.1
0 0.1 0.2 0.3 0.4 0.5 0.6
TYPICAL REGIONS OF STABILITY
†
COMPENSATION SERIES RESISTANCE
vs
ADDED CERAMIC CAPACITANCE
0.7 0.8 0.9 1
10
100
Added Ceramic Capacitance – µF
Region of Instability
V
I
= 3.5 V
No Input Capacitance
C
o
= 10 µF
I
O
= 100 mA
T
A
= 25°C
Compensation Series Resistance – ΩCSR –
Figure 13
†
CSR values below 0.1 Ω are not recommended.