ML7436N LSI Hardware Design Manual
FEXL7436NDG-01
25
9.2.
Switching regulator
Switching regulator operation causes large pulse current alternately, whose lines are blue/orange. Take the following
items into account.
⚫
Draw current lines to minimize the large current loop.
⚫
Mount inductor and capacitor close to IC and connect them with low impedance.
⚫
Mount the inductor L1 of the switching regulator and the transmission choke inductor L4 at an angle of 90°. It
influences the transmission spurious emission.
⚫
Implement the branching of GND and lines close to capacitors.
Figure 9.2
Current lines of switching regulator operation
DCDC_OUT(#24)
RF_GND(#22)
VDDIO(#25)
10uF
3.3uH
22uF
