Reference Design For Power Supply - Quectel LTE-A Module Series Hardware Design

circuit of VCC.
VCC
+
C1
D1
220 μF 1 μF
5.1 V

3.3.2. Reference Design for Power Supply

Power design for the module is very important, as the performance of the module largely depends on the
power source. The power supply can provide sufficient current (at least 2.5 A). If the voltage drop between
the input and output is not too high, an LDO is suggested to be used to supply power for the module. If
there is a big voltage difference between the input source and the desired output (VCC), a buck converter
is preferred to be used as the power supply.
The following figure shows a reference design for +5 V input power source. The typical output of the
power supply is about 3.7 V and the maximum load current is 3 A.
LDO_IN
2
R1
D1
C1
C2
TVS
470μF 100nF
R5
4.7K
MCU_POWER
R6
_ON/OFF
47K
Figure 5: Reference Design of Power Supply
EM120R-GL&EM160R-GL_Hardware_Design
EM120R-GL&EM160R-GL Hardware Design
C2
C4 C5
C3
100 nF 10 pF
33 pF
Figure 4: Reference Circuit of VCC
MIC29302WU
U1
4
IN OUT
R2
R3
LTE-A Module Series
Module
VCC
VCC
R4
C3
C4 C5 C6
100nF 33pF 10pF
470R 470μF
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