SNVS129E – MAY 2004 – REVISED JUNE 2005
Test Circuit and Layout Guidelines
C
IN
- 22
μF,
50V Tantalum, Sprague “199D Series”
C
OUT
- 47
μF,
25V Tantalum, Sprague “595D Series”
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
L1 - 68
μH
Sumida #RCR110D-680L
C
B
- 0.01
μF,
50V Ceramic
Figure 22. Standard Test Circuits and Layout Guides
Fixed Output Voltage Versions
C
IN
- 22
μF,
50V Tantalum, Sprague “199D Series”
C
OUT
- 47
μF,
25V Tantalum, Sprague “595D Series”
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
L1 - 68
μH
Sumida #RCR110D-680L
R1 - 1.5 kΩ, 1%
C
B
- 0.01
μF,
50V Ceramic
For a 5V output, select R2 to be 4.75 kΩ, 1%
where V
REF
= 1.21V
Use a 1% resistor for best stability.
Figure 23. Standard Test Circuits and Layout Guides
Adjustable Output Voltage Version
10
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