lm2619atl National Semiconductor Corporation, lm2619atl Datasheet - Page 14

• Manufacturer Part Number: lm2619atl
• Description: 500ma Sub-miniature Step-down Dc-dc Converter
• Manufacturer: National Semiconductor Corporation

www.national.com
Application Information
7. Place noise sensitive circuitry, such as radio IF blocks,
In mobile phones, for example, a common practice is to
place the DC-DC converter on one corner of the board,
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.
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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.