Reference Design For Power Supply - Quectel SC200L-EM Hardware Design

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 SC200L should be able to provide sufficient current up to 3A at
least. 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 +5V input power source.
DC_IN
C2
C1
100 nF
470 μF
NOTES
1. It is suggested that customers should switch off the power supply for the module in an abnormal
state, and then switch on the power to restart the module.
2. The module supports the battery charging function by default. If the above power supply design is
adopted, please make sure the charging function is disabled by software or connect VBAT to
Schottky diode in series to avoid the reverse current to the power supply chip.
SC200L_Hardware_Design
MIC29502WU
2
IN
R1
51K
Figure 4: Reference Circuit of Power Supply
U1
4
OUT
R2
100K
1%
R4
470R
R3
47K
1%
SC200L Hardware Design
VBAT
C3
C4
100 nF
470 μF
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