Datasheet

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Example 2. A 2.5-V to 1.2-V DC-to-DC Converter Using a TPS40041
0.0 2.5 3.5
1.210
1.208
1.206
1.198
0.5 2.0 3.0
1.202
1.0
1.200
1.204
2.25 2.5 2.75
1.5
I
OUT
− Load Current − A
V
OUT
− Output Voltage − V
0.0 2.0 3.5
100%
90%
80%
60%
0.5 1.5 3.01.0
50%
70%
2.5
I
OUT
− Load Current − A
η − Efficiency − %
2.25 2.5 2.75
TPS40040 , TPS40041
SLUS700D – MARCH 2006 – REVISED DECEMBER 2007
This example illustrates a 2.5-V to 1.2-V at 3-A synchronous buck application using the TPS40041. A diode has
been added to increase the bootstrap capacitor charging current at low input voltage. The highest current limit
threshold has been selected due to the increased R
DS(on)
at low input voltages.
Figure 28. Schematic for 2.5-V to 1.2-V at 3-A Converter Using the TPS40041
Figure 29. Typical Efficency for 2.5-V to 1.2-V at 3-A Figure 30. Typical Line/Load Regulation for 2.5-V to 1.2-V
Converter Using TPS40041 at 3-A Converter Using TPS40041
30 Copyright © 2006 – 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS40040 TPS40041