Datasheet

Thermal Performance
2-3
Test Setup and Results
Figure 2–2. Measured Efficiency
75
80
85
90
95
100
0 0.5 1 1.5 2 2.5 3
Efficiency – %
I
L
– Load Current – A
5 V
I
3.3 V
I
T
A
= 25°C
Figure 2–3. Measured Board Losses
0
0.2
0.4
0.6
0.8
1
1.2
0 0.5 1 1.5 2 2.5 3
Losses – W
I
L
– Load Current – A
5 V
I
3.3 V
I
T
A
= 25°C
2.3 Thermal Performance
The junction temperature is plotted versus the load current with a 25°C
ambient temperature in Figure 2–4. The low junction-to-case thermal
resistance of the PWP package, along with a good board layout, helps to keep
the junction temperature low at high output currents. With a 5-V input source
and a 3-A load, the junction temperature is approximately 45°C.