User's Manual

Application Note [Page 11
EMW3166_Guide For User Design
Figure 5 Recommended Package for SMT
DC power design 2.3
Peak current of EMW3166 is about 320mA. The DC/DC power chip MXCHIP recommended should be whose
maximum output current is over 600mA. DC/DC gets more superiority on power conversion than LDO.
When using DC/DC power chip, except for the requirements of output voltage (3.3V) and maximum current
(600mA), application designer should pay more attention on the arrangement of wires. For instance, device should
be compact enough, the ground of input and output should be well connected and the feedback signal should be far
away from the inductance and the Schottky diode. Please refer to the datasheet of DC/DC power chip for more
information.
When using LDO power chip, application designer need notice on the maximum current (600mA) and heat
dissipation.1.4 Recommended circuit design
Set the GND apart from power supply when designing layout to avoid the instantaneous peak current when power
on.