Product Info

Smart Module Series
SC200R Series Hardware Design
SC200R_Series_Hardware_Design 37 / 125
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.
EN
GND
ADJ
1 3 5
Figure 4: Reference Circuit of Power Supply
1. It is recommended to switch off the power supply when the module is in abnormal state, and then
switch on the power to restart the module.
2. The module supports battery charging by default. If the above power supply design is adopted, make
sure the charging function is disabled by software, or connect VBAT to a Schottky diode in series to
avoid the reverse current to the power supply chip.
NOTES