LM3501

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SNVS230C – DECEMBER 2003 – REVISED MAY 2013

resistor, RLED, should be kept close to the FB pin to minimize copper trace connections that can inject noise into

the system. The ground connection for the current setting resistor should connect directly to the GND pin. The

AGND pin should connect directly to the GND pin. Not connecting the AGND pin directly, as close to the chip as

possible, may affect the performance of the LM3501 and limit its current driving capability. Trace connections

made to the inductor should be minimized to reduce power dissipation, EMI radiation and increase overall

efficiency. It is good practice to keep the VSW routing away from sensitive pins such as the FB pin. Failure to do

so may inject noise into the FB pin and affect the regulation of the device. See Figure 34 and Figure 35 for an

example of a good layout as used for the LM3501 evaluation board.

Figure 34. Evaluation Board Layout (2X Magnification)

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