LM2674 Datasheet, PDF (21/32 Pages) National Semiconductor (TI) – SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator

LM2674
www.ti.com
SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013
APPLICATION INFORMATION
TYPICAL SURFACE MOUNT PC BOARD LAYOUT, FIXED OUTPUT (4X SIZE)
C_IN - 15 μF, 25V, Solid Tantalum Sprague, “594D series”
C_OUT - 68 μF, 10V, Solid Tantalum Sprague, “594D series”
D1 - 1A, 40V Schottky Rectifier, Surface Mount
L1 - 47 μH, L13, Coilcraft DO3308
C_B - 0.01 μF, 50V, Ceramic
TYPICAL SURFACE MOUNT PC BOARD LAYOUT, ADJUSTABLE OUTPUT (4X SIZE)
C_IN - 15 μF, 50V, Solid Tantalum Sprague, “594D series”
C_OUT - 33 μF, 25V, Solid Tantalum Sprague, “594D series”
D1 - 1A, 40V Schottky Rectifier, Surface Mount
L1 - 100 μH, L20, Coilcraft DO3316
C_B - 0.01 μF, 50V, Ceramic
R1 - 1k, 1%
R2 - Use formula in Design Procedure
Figure 29. PC Board Layout
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