LM3674_15 Datasheet, PDF (18/26 Pages) Texas Instruments – LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23

LM3674
SNVS405G – DECEMBER 2005 – REVISED APRIL 2015
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Layout Guidelines (continued)
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 (because 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 by using low-dropout linear regulators.
10.2 Layout Example
Figure 21. Board Layout Design Rules for the LM3674
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