Datasheet

2.2 Efficiency
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0 1 2 3 4
OutputCurrent- A
3.3Vin,1.8Vout
5Vin,1.8Vout
Efficiency-%
0
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0.001 0.01 0.1 1 10
OutputCurrent- A
3.3Vin,1.8Vout
5Vin,1.8Vout
Efficiency-%
www.ti.com Test Setup and Results
The efficiency of this EVM peaks at a load current of about 0.5 A – 1 A and then decreases as the load
current increases towards full load. Figure 1 shows the efficiency for the TPS54418EVM-375 at an
ambient temperature of 25 ° C.
Figure 1. TPS54418EVM-375 Efficiency
Figure 2 shows the efficiency for the TPS54418EVM-375 at lower output currents between 0.02 A and
0.20 A at an ambient temperature of 25 ° C.
Figure 2. TPS54418EVM-375 Low Current Efficiency
The efficiency may be lower at higher ambient temperatures, due to temperature variation in the
drain-to-source resistance of the internal MOSFET.
SLVU280 – May 2009 TPS54418EVM-375 4-A, SWIFT™ Regulator Evaluation Module 5
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