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
ISNS
VDD
TPS40200-HT
SGLS400C –OCTOBER 2009–REVISED DECEMBER 2012 www.ti.com
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 33 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 5. The efficiency and load regulation from boards
built from this design are shown in Figure 34 and Figure 35. Gerber files and additional application information
are available from the factory.
Figure 33. 8-V to 16-V V
IN
Step-Down Buck Converter
Figure 34. Full-Load Efficiency at 5-V V
OUT
Figure 35. Full-Load Efficiency at 3.3-V V
OUT
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