Datasheet

TPS77301/315/316/318/327/328/333/350 WITH RESET OUTPUT
TPS77401/415/418/427/428/433/450 WITH POWER GOOD OUTPUT
250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING
SLVS281E – FEBRUARY 2000 – REVISED JULY 2001
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 18
0.1
0 50 100 150 200 250
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
†
vs
OUTPUT CURRENT
10
I
O
– Output Current – mA
ESR – Equivalent Series Resistance – Ω
1
V
O
= 3.3 V
C
O
= 1 µF
V
I
= 4.3 V
T
J
= 25°C
Region of Stability
Region of Instability
Region of Instability
Figure 19
0.1
0 50 100 150 200 250
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
†
vs
OUTPUT CURRENT
10
I
O
– Output Current – mA
ESR – Equivalent Series Resistance – Ω
1
Region of Stability
Region of Instability
Region of Instability
V
O
= 3.3 V
C
O
= 10 µF
V
I
= 4.3 V
T
J
= 25°C
0.01
Figure 20
0.1
0 50 100 150 200 250
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
†
vs
OUTPUT CURRENT
10
I
O
– Output Current – mA
ESR – Equivalent Series Resistance – Ω
1
V
O
= 3.3 V
C
O
= 1 µF
V
I
= 4.3 V
T
J
= 125 °C
Region of Stability
Region of Instability
Region of Instability
Figure 21
0.1
0 50 100 150 200 250
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
†
vs
OUTPUT CURRENT
10
I
O
– Output Current – mA
ESR – Equivalent Series Resistance – Ω
1
Region of Stability
Region of Instability
0.01
Region of Instability
V
O
= 3.3 V
C
O
= 10 µF
V
I
= 4.3 V
T
J
= 125°C
†
Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any series resistance added
externally, and PWB trace resistance to C
O
.