TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
TYPICAL CHARACTERISTICS
TPS76933
TYPICAL REGIONS OF STABILITY
TPS76933
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
†
vs
OUTPUT CURRENT
100
ESR – Equivalent Series Resistance –
Ω
ESR – Equivalent Series Resistance –
Ω
VIN = 4.3 V
CO = 4.7
µF
3.3 V LDO
Region of Instability
100
EQUIVALENT SERIES RESISTANCE (ESR)
vs
ADDED CERAMIC CAPACITANCE
VIN = 4.3 V
CO = 4.7
µF
IL = 100 mA
10
Region of Instability
10
1
Region of Stability
Region of Stability
0.1
1
0
25
50
75
100
0
0.1
0.2 0.3 0.4 0.5
0.6 0.7 0.8
0.9
1
IO – Output Current – mA
Added Ceramic Capacitance –
µF
Figure 17
TPS76933
TYPICAL REGIONS OF STABILITY
Figure 18
TPS76933
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE (ESR)
†
vs
OUTPUT CURRENT
100
ESR – Equivalent Series Resistance –
Ω
ESR – Equivalent Series Resistance –
Ω
VIN = 4.3 V
CO = 10
µF
3.3 V LDO
Region of Instability
10
100
EQUIVALENT SERIES RESISTANCE (ESR)
vs
ADDED CERAMIC CAPACITANCE
VIN = 4.3 V
CO = 10
µF
IL = 100 mA
Region of Instability
10
1
Region of Stability
Region of Stability
0.1
0
25
50
75
100
IO – Output Current – mA
1
0
0.1
0.2 0.3 0.4 0.5
0.6 0.7 0.8
0.9
1
Added Ceramic Capacitance –
µF
Figure 19
Figure 20
10
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