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-Q1
SLUS739E –SEPTEMBER 2006–REVISED JULY 2013 www.ti.com
EXAMPLE APPLICATIONS
Application 1: Buck Regulator, 8-V to 12-V Input, 3.3-V or 5-V Output at 2.5 A
Overview
The buck regulator design shown in Figure 35 shows 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 for this application is given in Table 2. The efficiency from boards built from this design is
shown in Figure 36 and Figure 37. Gerber files and additional application information are available.
Figure 35. 8-V to 16-V V
IN
Step-Down Buck Converter
Figure 36. Full-Load Efficiency at 5-V V
OUT
Figure 37. Full-Load Efficiency at 3.3-V V
OUT
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