LM2674N-3.3 National Semiconductor, LM2674N-3.3 Datasheet - Page 9

• Manufacturer Part Number: LM2674N-3.3
• Description: DC/DC Converter IC
• Manufacturer: National Semiconductor

Specifications of LM2674N-3.3

• Input Voltage: 40V
• Output Current: 500mA
• Output Voltage: 3.3V
• No. Of Pins: 8
• Mounting Type: Through Hole
• Voltage Regulator Type: Switching
• Output Current Max: 500mA
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Test Circuit and Layout Guidelines
C
C
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
L1 - 68 µH Sumida #RCR110D-680L
C
C
C
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
L1 - 68 µH Sumida #RCR110D-680L
R1 - 1.5 kΩ, 1%
C
For a 5V output, select R2 to be 4.75 kΩ, 1%
where V
Use a 1% resistor for best stability.
IN
OUT
B
IN
OUT
B
- 0.01 µF, 50V Ceramic
- 0.01 µF, 50V Ceramic
- 22 µF, 50V Tantalum, Sprague “199D Series”
- 22 µF, 50V Tantalum, Sprague “199D Series”
- 47 µF, 25V Tantalum, Sprague “595D Series”
- 47 µF, 25V Tantalum, Sprague “595D Series”
REF
= 1.21V
FIGURE 2. Standard Test Circuits and Layout Guides
FIGURE 3. Standard Test Circuits and Layout Guides
Adjustable Output Voltage Versions
Fixed Output Voltage Versions
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10004122
10004123
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