Datasheet

0
20
40
60
80
100
h – Efficiency – %
Current Mode
V
I
= 12 V
R
GV
= 18 kW
0.001 0.01 0.1 1 10
I
O1
– 5-V Output Current – A
Auto-Skip
OOA
CCM
V
I
= 8 V
Auto-Skip
Current Mode
R
GV
= 18 kW
50
60
70
80
90
100
h – Efficiency – %
0.001 0.01 0.1 1 10
I
O1
– 5-V Output Current – A
V
I
= 12 V
V
I
= 20 V
4.2
4.4
4.6
4.8
5.0
5.2
4.5 5.0 5.5 6.5 7.0
V
O1
– 5-V Output Voltage – V
4.5
4.7
4.9
5.1
4.3
Auto-Skip Mode
f
SW
= 330 kHz
V
I
– Input Voltage – V
6.0
0
4
8
I
O
(A)
3.20
3.25
3.40
4.5 5.0 5.5 6.5 7.0
V
O2
– 3.3-V Output Voltage – V
3.30
3.35
V
I
– Input Voltage – V
6.0
0
4
8
I
O
(A)
Auto-Skip Mode
f
SW
= 330 kHz
TPS51220A
SLUS897E –DECEMBER 2008–REVISED JANUARY 2013 www.ti.com
TYPICAL CHARACTERISTICS (continued)
5-V OUTPUT VOLTAGE 3.3-V OUTPUT VOLTAGE
vs vs
INPUT VOLTAGE INPUT VOLTAGE
Figure 17. Figure 18.
5-V EFFICIENCY 5-V EFFICIENCY
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 19. Figure 20.
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