Datasheet

TPS76425, TPS76427, TPS76428, TPS76430, TPS76433
LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS
SLVS180B – MARCH 1999 – REVISED MAY 2001
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 15
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
1
Region of Instability
C
O
= 4.7 µF
T
A
= 25°C
Region of Instability
Figure 16
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
Region of Instability
Region of Instability
CSR – Compensation Series Resistance – Ω
I = 150 mA
C
O
= 4.7 µF
T
A
= 25°C
Figure 17
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
CSR – Compensation Series Resistance – Ω
Region of Instability
C
O
= 10 µF
Figure 18
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
CSR – Compensation Series Resistance – Ω
C
O
= 10 µF
Region of Instability
Region of Instability
†
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
.