Reference Design For Power Supply - Quectel EC25-V User Manual

VBAT
+
C1
D1
100uF
5.1V

3.6.3. 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 is capable of providing sufficient current up to 2A at least. If the
voltage drop between the input and output is not too high, it is suggested that you should use a LDO to
supply power for 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 a power supply.
The following figure shows a reference design for +5V input power source. The designed output for the
power supply is about 3.8V and the maximum load current is 3A.
DC_IN
470uF 100nF
EC25-V_User_Manual
69
C4
C2 C3
100nF 10pF
33pF
Figure 8: Star Structure of the Power Supply
MIC29302WU
2
IN
51K
4.7K
VBAT_EN
47K
Figure 9: Reference Circuit of Power Supply
Confidential / Released
+
C5
C6 C7
100uF 100nF 33pF
4
OUT
100K
1%
47K
1%
LTE Module Series
EC25-V User Manual
VBAT_RF
VBAT_BB
C8
10pF
Module
470R
470uF
VBAT
100nF
27 /