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Example 3: 5-V to 3.3V and 5-V to 1.2 V
1 k 10 k 100 k 300 k
-180
-90
-45
45
90
-135
0
180
135
f - Frequency -Hz
Phase - °
-80
-20
0
60
80
-60
20
Gain - dB
-40
40
V
OUT
= 1.2 V
Gain Phase
WIth Lead
Without Lead
1.0 1.5 2.0 2.50 0.5
I
OUT
- Load Current - A
10
40
70
0
90
100
50
h - Efficiency - %
30
20
60
80
V
IN
= 5.0 V
V
OUT
(V)
1.2
3.3
V
OUT
= 1.2 V
V
OUT
= 3.3 V
TPS54283 , , TPS54286
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
For a low input voltage application, the TPS54286 is selected for reduced size and all ceramic output capacitors
are used. 22- µ F input capacitors are selected to reduce input ripple and lead capacitors are placed in the
feedback to boost phase margin.
Figure 49. 5-V to 3.3V and 5-V to 1.2 V
Figure 50. Efficiency vs. Load Current Figure 51. Example 3 Loop Response
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Product Folder Link(s): TPS54283 TPS54286