Datasheet

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS210D – JUNE 1999 – REVISED MAY 2001
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 17
1
02550
100
I
O
– Output Current – mA
ESR – Equivalent Series Resistance – Ω
10
TPS77033
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
†
vs
OUTPUT CURRENT
V
IN
= 4.3 V
C
O
= 4.7 µF
ESR = 0.3 Ω
3.3 V LDO
5 1015 20 30354045
Region of Instability
Region of Stability
0.1
Figure 18
0 0.1 0.2 0.3 0.4 0.5
Added Ceramic Capacitance – µF
0.6 0.7 0.8 0.9 1
1
100
ESR – Equivalent Series Resistance – Ω
10
Region of Instability
Region of Stability
V
IN
= 4.3 V
C
O
= 4.7 µF
I
L
= 50 mA
TPS77033
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
vs
ADDED CERAMIC CAPACITANCE
Figure 19
I
O
– Output Current – mA
1
02550
100
ESR – Equivalent Series Resistance – Ω
10
TPS77033
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
†
vs
OUTPUT CURRENT
V
IN
= 4.3 V
C
O
= 10 µF
ESR = 0.3 Ω
3.3 V LDO
5101520 30354045
Region of Stability
Region of Instability
Figure 20
Added Ceramic Capacitance – µF
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
1
100
ESR – Equivalent Series Resistance – Ω
10
Region of Instability
Region of Stability
V
IN
= 4.3 V
C
O
= 10 µF
I
L
= 50 mA
TPS77033
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
vs
ADDED CERAMIC CAPACITANCE