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3.5
3.7
3.9
4.1
4.3
4.5
−50 −25 0 25 50 75 100 125 150
V
I
− Input Voltage − V
T
A
− Free-Air Temperature − 5C
T
J
= 25°C
Start
Stop
0.9
1.0
1.1
1.2
1.3
0 5 10 15 20 25
Disabled Supply Current − mA
V
I
− Input Voltage − V
T
J
= 25°C
0
2
4
6
8
10
0 5 10 15 20 25
V -InputVoltage-V
I
I
-SupplyCurrent-mA
CC
Switching
NonSwitching
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
250 350 450 550 650 750
Switching Frequency − kHz
Power Good Delay − ms
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
0 5 10 15 20 25
V
BIAS
− Bias Voltage − V
V
I
− Input Voltage − V
T
J
= 25°C
96.0
96.5
97.0
97.5
98.0
−50 −25 0 25 50 75 100 125 150
PWRGD − Power Good Threshold − %
T
J
− Junction Temperature − 5C
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 10 20 30 40 50 60 70 80
t − Time − ms
SlowStartCapacitance
−
Fm
Switching Frequency − kHz
1
1.5
2
2.5
3
3.5
4
4.5
5
250 350 450 550 650 750
Slow Start Time − ms
1
1.25
1.50
1.75
2
100 150 200 250 300
PH Voltage − V
I
CC
− Supply Current − mA
V
I
= 4.5 V
V
I
= 12 V
TPS54550
SLVS623A–MARCH2006–REVISEDAPRIL2006
TYPICALCHARACTERISTICS(continued)
VIN(UVLO)STARTANDSTOPENABLEDSUPPLYCURRENTDISABLEDSUPPLYCURRENT
vsvsvs
FREE-AIRTEMPERATUREINPUTVOLTAGEINPUTVOLTAGE
Figure14.Figure15.Figure16.
BIASVOLTAGEPOWERGOODTHRESHOLDPOWERGOODDELAY
vsvsvs
INPUTVOLTAGEJUNCTIONTEMPERATURESWITCHINGFREQUENCY
Figure17.Figure18.Figure19.
PHVOLTAGESLOWSTARTCAPACITANCEINTERNALSLOWSTARTTIME
vsvsvs
PHSINKCURRENTTIMESWITCHINGFREQUENCY
Figure20.Figure21.Figure22.
14
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