TPS51211
SLUSAA7 –NOVEMBER 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
1.1-V EFFICIENCY
vs
OUTPUT CURRENT
100
V
I
= 12 V
= 20 A
IN
EN (5 V/div)
V
= 1.1 V
OUT
90
80
OUT
70
60
50
40
30
20
10
0
V
(0.5 V/div)
OUT
PGOOD (5 V/div)
V
(V)
IN
8
12
20
t – Time – 500 µs/div
0.001
0.01
0.1
1
10
100
IOUT – Output Current – A
Figure 9.
Figure 10. 1.1-V Start-Up Waveform
X
X
X
V
I
= 12 V
= 0 A
IN
EN (5 V/div)
EN (5 V/div)
OUT
V
= 12 V
IN
I
= 0 A
0.5-V pre-biased
OUT
V
(0.5 V/div)
OUT
V
(0.5 V/div)
OUT
PGOOD (5 V/div)
PGOOD (5 V/div)
DRVL (5 V/div)
t – Time – 500 µs/div
t – Time – 10 µs/div
Figure 11. Pre-Biased Start-Up Waveform
Figure 12. 1.1-V Soft-Stop Waveform
X
X
X
X
X
X
10
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