2. Power
PNT-SG3FS GNSS Module Hardware User Guide
12
Power Supply Design Reference
If power supply is undisturbed, no filtering is required. Nevertheless, it could be planned for a first
PCB wave to have soldering pads as shown in Figure 4 below for filtering. A 27nH inductor can
be 0 ohms and replace by a line for a second PCB.
If one wave is planned, use only capacitor footprint and not the inductor.
Figure 4: Power Supply Filtering
Current Consumption Optimization
Use of an SMPS at 1.8V to supply VCC is recommended to optimize current consumption.
Figure 5 is an application example with an external switching voltage regulator in order to achieve
an efficiency around 85%.
Figure 5: Example of SMPS to Improve Current Consumption
If VCC_IO is also supplied via an SMPS, this will enable the lowest current consumption.
1M
Ω
4.7µF
V
IN
2.3V – 5.5V
470nH
ST1S15J18R
MODE
A1
SW
B1
FB
C1
V
IN
A2
EN
B2
GND
C2
4.7µF
LQM21PNR47MC0D
