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0 50 100 150 200 250
0.1
10
1
V
O
=3.3V
C =6.8 F
T =+25 C
O
J
m
°
ESR EquivalentSeriesResistance- - W
REGIONOFINSTABILITY
REGIONOFINSTABILITY
I
O
- -OutputCurrent mA
250mW
0.1
0.01
0 50 100 150 200 250
10
1
REGIONOF INSTABILITY
V
O
=3.3V
C =10 F
T =+25 C
O
J
m
°
50mW
ESR EquivalentSeriesResistance
- - W
I
O
- -OutputCurrent mA
REGIONOFINSTABILITY
0 25 50 75 100 125
REGIONOF INSTABILITY
0.1
1
10
V
O
=1.8V
C =6,8 F
T =+25 C
O
J
m
°
ESR EquivalentSeriesResistance
- - W
REGIONOFINSTABILITY
I
O
- -OutputCurrent mA
250mW
0.1
0.01
0 25 50 75 100 125
10
1
REGIONOF INSTABILITY
V
O
=1.8V
C =10 F
T =+25 C
O
J
m
°
ESR EquivalentSeriesResistance- - W
REGIONOFINSTABILITY
I
O
- -OutputCurrent mA
50mW
TPS70845, TPS70848
TPS70851, TPS70858
TPS70802
SLVS301D – JUNE 2000 – REVISED DECEMBER 2007
TYPICAL REGION OF STABILITY TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
(1)
EQUIVALENT SERIES RESISTANCE
(1)
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 30. Figure 31.
TYPICAL REGION OF STABILITY TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
(1)
EQUIVALENT SERIES RESISTANCE
(1)
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 32. Figure 33.
(1)
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
.
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