Smart Module Series
SC200L_Series(Dual-band Wi-Fi)_Hardware_Design 34 / 111
Module
VBAT_RF
VBAT_BB
VBAT
C1
100
μF
C7
100
C8
33 pF
C9
10 pF
+
C3
100 nF
C4
33 pF
C5
10 pF
D1
C6
μF
NM
C2
4.7
μF
100 nF
Figure 4: Star Structure of Power Supply
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
C1
C2
MIC29502WU
U1
IN
OUT
E
N
G
N
D
A
D
J
2
4
1
3
5
VBAT
100 nF
C3
470
μF
C4
100 nF
R2
100K
47K
R3
470
μF
470R
51K
R4
R1
1%
1%
Figure 5: Reference Circuit of Power Supply