Datasheet

100
90
80
70
60
50
40
30
20
0 100 200 300 400 500 600 700 800 900 1000
Efficiency - %
I - Output Current - mA
O
TPS54120EVM Efficiency
V = 10 V
in
V = 8 V
in
V =12 V
in
V =15 V
in
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4.5 Efficiency
Figure 7 shows the efficiency for the TPS54120 at an ambient temperature of 25°C for Vin= 8V, 10V, 12V,
and 15V. The switcher output voltage is set to 4.1V and the LDO is set to 3.3V.
Figure 7. TPS54120 Efficiency
4.6 Thermal Characteristic
This section shows a thermal image of the TPS54120 running at 12 V input and 1A load, 3.3V LDO OUT,
and 4.1V Switcher out. There is no air flow and the ambient temperature is 25°C. The peak temperature of
the IC (56.4°C) is well below the maximum recommended operating condition listed in the data sheet of
150°C.
8
TPS54120EVM, Low Noise 1A Power Supply Evaluation Module SLVU641– January 2012
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