Datasheet

0 0.5 1 1.5 2 2.5 3
LoadCurrent- A
Efficiency-%
50
60
70
80
90
100
V =8V
V =12V
V =16V
IN
IN
IN
V =3.3V
OUT
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3
LoadCurrent- A
Efficiency-%
V =8V
V =12V
V =16V
IN
IN
IN
V =5V
OUT
Notes
R6=26.7kfor3.3Vout,R6=16.2kfor5.0Vout
+
+
D3:Donotpopulate.SOT23CommonCathodeDualSchottky
TPS40200-EP
www.ti.com SGLS371A –JANUARY 2007–REVISED JANUARY 2013
EXAMPLE APPLICATIONS
Application 1: Buck Regulator, 8-V to 12-V Input, 3.3 V or 5 V at 2.5-A Output
Overview
The buck regulator design shown in Figure 32 illustrates the use of the TPS40200. It delivers 2.5 A at either
3.3 V or 5 V as selected by a single feedback resistor. It achieves approximately 90% efficiency at 3.3 V and
94% at 5 V. A discussion of design tradeoffs and methodology is included to serve as a guide to the successful
design of forward converters using the TPS40200.
The Bill of Materials (BOM) for this application is given in Table 3. The efficiency and load regulation from boards
built from this design are shown in Figure 33 and Figure 34. Gerber files and additional application information
are available from the factory.
Figure 32. 8-V to 16-V V
IN
Step-Down Buck Converter
Figure 33. Full-Load Efficiency at 5-V V
OUT
Figure 34. Full-Load Efficiency at 3.3-V V
OUT
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