Datasheet

Vo = 1.5 V
VIN (50 mV/div)
SW (5 V/div)
500 ns/div
Vo (10 mV/div)
V = 1.05 V
O
SW (5 V/div)
0.75
0.755
0.76
0.765
0.77
0.775
0.78
-50 0 50 100 150
T - Junction Temperature - °C
J
Vfb - Voltage - V
0
100
200
300
400
500
600
700
800
0 1 2 3 4
I - Output Current - A
O
V = 1.8 V
O
V = 1.05 V
O
f - Switching Frequency - kHz
sw
V = 3.3 V
O
400
450
500
550
600
650
700
750
800
850
900
0
5
10 15 20
V - Input Voltage - V
I
f
sw
- Switching Frequency - kHz
V = 5 V
O
V = 2.5 V
O
V = 1.8 V
O
V = 1.5 V
O
V = 1.2 V
O
V = 1.05 V
O
V = 3.3 V
O
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1
Efficiency - %
I - Output Current - A
O
V = 3.3 V
O
V = 2.5 V
O
V = 1.8 V
O
TPS54428
www.ti.com SLVSB42B –NOVEMBER 2011–REVISED MARCH 2013
TYPICAL CHARACTERISTICS (continued)
VIN = 12 V, TA = 25°C (unless otherwise noted)
Figure 9. LIGHT LOAD EFFICIENCY vs OUTPUT CURRENT Figure 10. SWITCHING FREQUENCY vs INPUT VOLTAGE
Figure 11. SWITCHING FREQUENCY vs OUTPUT CURRENT Figure 12. VFB VOLTAGE vs JUNCTION TEMPERATURE
Figure 13. VOLTAGE RIPPLE vs RIPPLE AT OUTPUT (I
O
= Figure 14. VOLTAGE RIPPLE vs RIPPLE AT INPUT (I
O
= 4A
4A
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