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The following figure shows a reference design for +5V input power source which adopts an LDO
(MIC29502WU) from MICROCHIP. The typical output voltage is 4.0V and the maximum rated current is
5.0A.
DC_IN
R1
C2
C1
51K
100nF
470uF
Figure 5: Referfence Circuit of Power Supply
NOTES
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 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.
3.
When the battery power is reduced to 0%, the system will trigger automatic shutdown, so the design
of power supply should be consistent with the configuration of fuel gauge driver.
SC66_Hardware_Design
MIC29502WU
U1
2
4
IN
OUT
R2
220K
1%
R4
470R
R3
100k
1%
Smart LTE Module Series
SC66 Hardware Design
VBAT
C3
C4
470uF
100nF
44 / 139
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