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LM2619 Datasheet(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM2619
Description  500mA Sub-Miniature Step-Down DC-DC Converter
PDF  15 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2619 Datasheet(HTML) 14 Page - National Semiconductor (TI)

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Application Information (Continued)
7.
Place noise sensitive circuitry, such as radio IF blocks,
away from the DC-DC converter, CMOS digital blocks
and
other
noisy
circuitry.
Interference
with
noise-sensitive circuitry in the system can be reduced
through distance.
In mobile phones, for example, a common practice is to
place the DC-DC converter on one corner of the board,
arrange the CMOS digital circuitry around it (since this also
generates noise), and then place sensitive preamplifiers and
IF stages on the diagonally opposing corner. Often, the
sensitive circuitry is shielded with a metal pan and power to
it is post-regulated to reduce conducted noise, using
low-dropout linear regulators.
www.national.com
14



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