TPS54540
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SLVSBX7 –MAY 2013
TYPICAL CHARACTERISTICS (continued)
BOOT-SW UVLO vs JUNCTION TEMPERATURE
INPUT VOLTAGE UVLO vs JUNCTION TEMPERATURE
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
4.5
BOOT-PH UVLO Falling
BOOT-PH UVLO Rising
UVLO Start Switching
UVLO Stop Switching
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
œ50
œ25
0
25
50
75
100
125
150
œ50
œ25
0
25
50
75
100
125
150
C043
C044
TJ - Junction Temperature (°C)
TJ - Junction Temperature (°C)
Figure 19.
Figure 20.
SOFT-START TIME vs SWITCHING FREQUENCY
5 V START and STOP VOLTAGE
5.6
5.5
5.4
5.3
5.2
5.1
5
10
9
8
7
6
5
4
3
2
1
0
Start
Stop
12 V, 25°C
12 V, 25 C
Dropout
Voltage
4.9
4.8
4.7
4.6
Dropout
Voltage
0
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
100 300 500 700 900 11001300150017001900210023002500
100 300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500
C046
Output Current (A)
Switching Frequency (kHz)
C045
Figure 21.
Figure 22.
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