Reference Design For Power Supply - Quectel SC200R Series Hardware Design

VBAT
+
D1
C1
C2
4.7 μF
100 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 SC200R series module should be able to provide sufficient current
of at least 3 A. If the voltage drop between the input and output is not too high, 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. The typical output voltage is
3.8 V and the maximum load current is 5.0 A.
DC_IN
C2
C1
100 nF
470 μF
SC200R&SC262R_Series_Hardware_Design
C4 C5
C3
100 nF 33 pF 10 pF
Figure 3: Star Structure of the Power Supply
U1
2
IN
R1
51K
Figure 4: Reference Circuit of Power Supply
+
D2
C9
C 6 C7
100 μF
33 pF 10 pF
100 nF
4
OUT
R2
100K
1%
R4
470R
R3
47K
1%
Smart Module Series
VBAT_RF
VBAT_BB
C8
GND
Module
C3
C4
470 μF
100 nF
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VBAT