Reference Design For Power Supply - Quectel SC200L Series Hardware Design

VBAT
D1 C1 C2
+
100 μF 4.7 μF

3.4.3. Reference Design for Power Supply

The power design for the module is very important, as the performance of the module largely depends on
the power source. The power supply of the module should be able to provide sufficient current of at least
3 A. If the voltage difference between the input and output is not too big, it is suggested to use an LDO to
supply power for the module. If there is a big voltage difference between the input source and the desired
output (VBAT), a buck converter is recommended.
The following figure shows a reference design for +5 V input power source.
DC_IN
C2
C1
100 nF
470 μF
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design
C3 C4 C5
100 nF 33 pF 10 pF
Figure 4: Star Structure of Power Supply
MIC29502WU
2
IN
R1
51K
Figure 5: Reference Circuit of Power Supply
C6 C7 C8
μF
100 100 nF 33 pF
NM
U1
4
OUT
R2
100K
1%
R4
470R
R3
47K
1%
Smart Module Series
VBAT_RF
VBAT_BB
C9
10 pF
Module
C3
C4
470 μF
100 nF
VBAT
34 / 111