LM2671 datasheet(10/31 Pages) TI

10 / 31 page

LM2671

SNVS008K – SEPTEMBER 1998 – REVISED APRIL 2013

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TEST CIRCUIT AND LAYOUT GUIDELINES

CIN - 22 μF, 50V Tantalum, Sprague “199D Series”

COUT - 47 μF, 25V Tantalum, Sprague “595D Series”

D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F

L1 - 68

μH Sumida #RCR110D-680L

CB - 0.01 μF, 50V Ceramic

Figure 22. Standard Test Circuits and Layout Guides

Fixed Output Voltage Versions

CIN - 22 μF, 50V Tantalum, Sprague “199D Series”

COUT - 47 μF, 25V Tantalum, Sprague “595D Series”

D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F

L1 - 68

μH Sumida #RCR110D-680L

R1 - 1.5 k

Ω, 1%

CB - 0.01 μF, 50V Ceramic

For a 5V output, select R2 to be 4.75 k

Ω, 1%

where VREF = 1.21V

Use a 1% resistor for best stability.

Figure 23. Standard Test Circuits and Layout Guides

Adjustable Output Voltage Versions

Application Hints

The LM2671 provides all of the active functions required for a step-down (buck) switching regulator. The internal

power switch is a DMOS power MOSFET to provide power supply designs with high current capability, up to

0.5A, and highly efficient operation.

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LM2671 Datasheet(PDF) 10 Page - Texas Instruments