Product Info

LTE Standard Module Series
EG95 Series Hardware Design
EG95_Series_Hardware_Design
37 / 99
+
33 pF
10 pF
1
EN
3
GND
5
ADJ
VBAT
VBAT_RF
+
D1
C1
C2 C3
C4
C5
C6 C7 C8
VBAT_BB
WS4.5D3HV
100 μF
100 nF 33 pF 10 pF 100 μF 100 nF
Module
Figure 8: Star Structure of Power Supply
3.6.3. 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 should be able to provide sufficient current up to 2A at least. If the voltage
drop between the input and output is not too high, it is suggested that an LDO should be used 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 preferred to be used as the power supply.
The following figure shows a reference design for +5V input power source. The typical output of the power
supply is about 3.8V and the maximum load current is 3.0A.
MIC29302WU
DC_IN
2
IN OUT
4
VBAT
100K
51K
1%
470 μF 100 nF
VBAT_EN
4.7K
47K
47K
1%
470R
470 μF 100 nF
Figure 9: Reference Circuit of Power Supply