LM3677TLX-ADJ National Semiconductor Corporation, LM3677TLX-ADJ Datasheet - Page 18

• Manufacturer Part Number: LM3677TLX-ADJ
• Description: 3mhz, 600ma Miniature Step-down Dc-dc Converter For Ultra Low Voltage Circuits
• Manufacturer: National Semiconductor Corporation

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7.
In mobile phones, for example, a common practice is to place
the DC-DC converter on one corner of the board, arrange the
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.
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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 cir-
cuitry is shielded with a metal pan and power to it is post-
regulated to reduce conducted noise, using low-dropout
linear regulators.