Datasheet

TPS7201Q, TPS7225Q, TPS7230Q
TPS7233Q, TPS7248Q, TPS7250Q, TPS72xxY
MICROPOWER LOW-DROPOUT (LDO) VOLTAGE REGULATORS
SLVS102G – MARCH 1995 – REVISED JUNE 2000
25
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 27
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 28
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
= 250 mA
C
O
= 4.7 µF
No Input Capacitor Added
Region of Instability
Region of
Instability
CSR – Compensation Series Resistance – Ω
Figure 29
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
1
Region of Instability
T
A
= 25°C
V
I
= V
O
+ 1 V
C
O
= 10 µF
No Added Ceramic Capacitance
No Input Capacitor Added
Region of Instability
CSR – Compensation Series Resistance – Ω
Figure 30
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
1
0.6 0.7 0.8 0.9 1
Region of Instability
T
A
= 25°C
V
I
= V
O
+ 1 V
I
O
= 250 mA
C
O
= 10 µF
No Input Capacitor Added
Region of
Instability
CSR – Compensation Series Resistance – Ω
†
CSR refers to the total series resistance, including the ESR of the capacitor, any series resistance added externally, and PWB trace resistance
to C
O
.