Datasheet

40
50
60
70
80
90
100
Efficiency - %
V = 1.8 V
O
V = 2.5 V
O
V = 3.3 V
O
1 2 3
4
5
I - Output Current - A
O
0
1 ms/div
EN (10 V/div)
VREG5 (5 V/div)
Vout (0.5 V/div)
1.04
1.05
1.06
1.07
1.08
0
5
10 15 20
V - Input Voltage - V
I
V - Output Voltage - V
O
I = 10 mA
O
I = 1 A
O
100 s/divm
Vout (50 mV/div)
Iout (2 A/div)
1
1.025
1.05
1.075
1.1
0 1 2 3 4
I - Output Current - A
O
V - Output Voltage - V
O
V = 18 V
I
V = 5 V
I
V = 12 V
I
0
5
10 15 20
EN Input Voltage - V
V = 18 V
I
0
5
10
15
20
25
30
35
40
45
50
EN Input Current - Am
TPS54428
SLVSB42B –NOVEMBER 2011–REVISED MARCH 2013 www.ti.com
TYPICAL CHARACTERISTICS (continued)
VIN = 12 V, TA = 25°C (unless otherwise noted)
Figure 3. EN CURRENT vs EN VOLTAGE Figure 4. 1.05V OUTPUT VOLTAGE vs OUTPUT CURRENT
Figure 5. 1.05V OUTPUT VOLTAGE vs VIN VOLTAGE Figure 6. 1.05V LOAD TRANSIENT RESPONSE
Figure 7. START UP WAVEFORM Figure 8. EFFICIENCY vs OUTPUT CURRENT
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