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FM350-GL Hardware Guide Page 22 of 67
Power Supply
The FM350 module should be powered through the +3.3V pins, and the power supply design is shown in
Figure 3-2:
Figure 3-2 Power supply design
The filter capacitor design for power supply as shown in the following table:
Voltage-stabilizing capacitors
Reduce power fluctuations of the module in
operation, requiring capacitors with low ESR.
LDO or DC/DC power supply requires the
capacitor of no less than 440uF
The capacitor for battery power supply
can be reduced to 100~200uF
Filter out the interference generated from the
clock and digital signals
700/800, 850/900 MHz frequency
band
Filter out low frequency band RF interference
18pF, 10pF,
8.2pF, 6.8pF,
3.9pF
1500/1800, 2100/2300,
2600MHz, 3500/3600/3700MHz,
5GHz
Filter out medium/high frequency band RF
interference
The stable power supply can ensure the normal operation of FM350 module; and the ripple of the power
supply should be less than 300mV in design. Module supports 5G NR Sub-6 download, when module
operates with the maximum data transfer throughput, the peak current can reach to upper 3500mA. It
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