Datasheet

Power Dissipation
2-4
2.3 Power Dissipation
The low junction-to-case thermal resistance of the PWP package, along with
a good board layout, allows the TPS54x72EVM−222 EVMs to output full rated
load current while maintaining safe junction temperatures. With a 3.3-V input
source and a 6-A load, the junction temperture is approximately 60°C, while
the case temperature is approximately 55°C. The total circuit losses at 25°C
are shown in Figure 2−3. The input voltage for the TPS54972 is 3.3 V and for
the TPS54672 and TPS54872, 5.0 V. Note that for a given output current the
TPS54972 dissipates less power due to the lower drain-to-source on
resistance of the MOSFETs. For additional information on the dissipation
ratings of the devices, see the individual product data sheets.
Figure 2−3. Power Dissipation
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
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10
TPS54872
TPS54672
TPS54972
POWER DISSIPATION
vs
OUTPUT CURRENT
I
O
− Output Current − A
− Power Dissipation − W
P
D