LM2674N-3.3 National Semiconductor, LM2674N-3.3 Datasheet - Page 22

• 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

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Application Information
TYPICAL SURFACE MOUNT PC BOARD LAYOUT,
FIXED OUTPUT (4X SIZE)
C
C
D1 - 1A, 40V Schottky Rectifier, Surface Mount
L1 - 47 µH, L13, Coilcraft DO3308
C
TYPICAL SURFACE MOUNT PC BOARD LAYOUT,
ADJUSTABLE OUTPUT (4X SIZE)
C
C
D1 - 1A, 40V Schottky Rectifier, Surface Mount
L1 - 100 µH, L20, Coilcraft DO3316
C
R1 - 1k, 1%
R2 - Use formula in Design Procedure
IN
OUT
B
IN
OUT
B
- 0.01 µF, 50V, Ceramic
- 0.01 µF, 50V, Ceramic
- 15 µF, 25V, Solid Tantalum Sprague, “594D series”
- 15 µF, 50V, Solid Tantalum Sprague, “594D series”
- 68 µF, 10V, Solid Tantalum Sprague, “594D series”
- 33 µF, 25V, Solid Tantalum Sprague, “594D series”
FIGURE 18. PC Board Layout
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22
10004136