LM3202 datasheet(14/15 Pages) NSC

Part #	LM3202

Description	650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers

PDF	15 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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14 / 15 page

Application Information (Continued)

Connect the ground pins of the LM3202, and filter ca-

pacitors together using generous component-side cop-

per fill as a pseudo-ground plane. Then connect this to

the ground-plane (if one is used) with several vias. This

reduces ground-plane noise by preventing the switching

currents from circulating through the ground plane. It

also reduces ground bounce at the LM3202 by giving it

a low-impedance ground connection.

Use wide traces between the power components and for

power connections to the DC-DC converter circuit. This

reduces voltage errors caused by resistive losses across

the traces

Route noise sensitive traces, such as the voltage feed-

back path, away from noisy traces between the power

components. The voltage feedback trace must remain

close to the LM3202 circuit and should be routed directly

from FB to V

OUT at the output capacitor and should be

routed opposite to noise components. This reduces EMI

radiated onto the DC-DC converter’s own voltage feed-

back trace.

LM3202 Datasheet(PDF) 14 Page - National Semiconductor (TI)