LM2621

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SNVS033C – MAY 2004 – REVISED MARCH 2005

Table 1. Suggested Manufacturers List

Inductors

Capacitors

Diodes

Coilcraft

Sprague/ Vishay

Motorola

Tel: (800) 322-2645

Tel: (207) 324-4140

Tel: (800) 521-6274

Fax: (708) 639-1469

Fax: (207) 324-7223

Fax: (602) 244-6609

Coiltronics

Kemet

International Rectifier (IR)

Tel: (407) 241-7876

Tel: (864) 963-6300

Tel: (310) 322-3331

Fax: (407) 241-9339

Fax: (864) 963-6521

Fax: (310) 322-3332

Pulse Engineering

Nichicon

General Semiconductor

Tel: (619) 674-8100

Tel: (847) 843-7500

Tel: (516) 847-3222

Fax: (619) 674-8262

Fax: (847) 843-2798

Fax: (516) 847-3150

PC BOARD LAYOUT

High switching frequencies and high peak currents make a proper layout of the PC board an important part of

design. Poor design can cause excessive EMI and ground-bounce, both of which can cause malfunction and loss

of regulation by corrupting voltage feedback signal and injecting noise into the control section.

Power components - such as the inductor, input and output filter capacitors, and output diode - should be placed

as close to the regulator IC as possible, and their traces should be kept short, direct and wide. The ground pins

of the input and output filter capacitors and the PGND and SGND pins of LM2621 should be connected using

copper area to dissipate the heat due to power loss in the circuitry and prevent the thermal protection circuitry in

the IC from shutting the IC down.

Copyright © 2004–2005, Texas Instruments Incorporated

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Product Folder Links: LM2621