Reference Design For Power Supply - Quectel EC25 series User Manual

VBAT
+
D 1 C1
5.1 1V 100 uF
3.6.3. Re eference D Design for
The power d design for th
the power s source. The e power sup
voltage drop p between t
supply pow er for modu
output (VBA AT), a buck c
The followin ng figure sh
power supp ply is about 3
DC_IN
470uF 100nF
C2 C3 C4
100 nF 33 3pF 10pF
Figure e 8: Star St
r Power Su
he module is s very impor
pply is capa
the input an nd output is
ule. If there is a big volt
converter is preferred to
ows a refere ence design
3.8V and the e maximum
MIC
2
IN
51K
4.7 K
VBAT_EN
47K
Figure e 9: Referen
E EC25-A_Us ser_ManualC
+
C5 C6 C7
1 100 uF 10 00 nF 33pF
ructure of t the Power S
upply
rtant, asthe performanc
ble of provi ding sufficie
not too high h, it is sugge
tage differen nce betwee
o be used as s a power su
n for +5V inp put power s
load current t is 3A.
C29302WU
4
OU UT
100K
1%
47K
1%
nce Circuit of Power S
Confidentia al / Release
EC25-AU
VB BAT _RF
VB BAT_BB
C8
10pF
Modu
Supply
e of the mod dule largely
ent current u up to 2A at
ested that y you shouldus
n the input source and
upply.
source. The designed o
470R
470uF
Supply
d 27 / 6 69
LTE Module L e
ser Manua al
ule
depends on n
least. If the e
se a LDO to o
the desired d
utput for the e
VBAT
100nF