I = 1 A
O
0 2 4 6 8 10 12 14 16 18 20
V - Input Voltage - V
I
400
450
500
550
600
650
700
750
800
fsw - Switching Frequency - kHz
0.01 0.1 1 10
I - Output Current - A
O
0
100
200
300
400
500
600
700
800
fsw - Switching Frequency - kHz
V = 12 V
IN
0 2 4 6 8 10 12 14 16 18 20
V - Input Voltage - V
I
400
450
500
550
600
650
700
750
800
fsw - Switching Frequency - kHz
I = 1 A
O
0
10
20
30
40
50
60
70
80
90
100
Efficiency - %
0.001 0.1 10
I - Output Current - A
O
0.01 1
V = 6 V
IN
V = 12 V
IN
V = 18 V
IN
0
10
20
30
40
50
60
70
80
90
100
Efficiency - %
0.001 0.1 10
I - Output Current - A
O
V = 6 V
IN
V = 12 V
IN
V = 18 V
IN
0.01 1
40
50
60
70
80
90
100
Efficiency - %
0 0.5 1 1.5 2 2.5 3
I - Output Current - A
O
V = 5 V
IN
V = 12 V
IN
V = 18 V
IN
TPS54394
www.ti.com
SLVSBE6 –JUNE 2012
TYPICAL CHARACTERISTICS (continued)
One output is enabled unless otherwise noted. V
I
= VIN1 or VIN2. VIN = 12 V, T
A
= 25°C (unless otherwise noted).
Figure 13. VO1=3.3V, Efficiency vs Output Current Figure 14. VO2=1.5V, Efficiency vs Output Current
Figure 15. VO2=1.5V, Efficiency vs Output Current Figure 16. VO1=3.3V, SW-frequency vs Input Voltage
Figure 17. VO2=1.5V, SW-frequency vs Input Voltage Figure 18. VO1=3.3V, SW-frequency vs Output Current
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