Product Info

LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 38 / 100
Module
VBAT_RF
VBAT_BB
VBAT
C1
100uF
C7
100nF
C8
33pF
C9
10pF
+
+
C2
100nF
C5
100
uF
C3
33pF
C4
10pF
D1
5.1V
+
C6
100uF
Figure 9: Star Structure of the 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 of EG12 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, 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
(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. In this design, output of the
power supply is about 3.8V and the maximum load current is 3A.
DC_IN
MIC29302WU
IN OUT
EN
GND
ADJ
2 4
1
3
5
VBAT
100nF
470uF
100nF
100K
47K
470uF
470R
51K
1%
1%
4.7K
47K
VBAT_EN
Figure 10: Reference Circuit of Power Supply