LTE-A Module Series
EM160R-GL_Hardware_Design 25 / 73
The following figure shows a reference circuit of VCC.
Module
ET
2, 4
C2
220
μ
F
3, 5, 11
VCC (3.7 V Typ.)
VCC
GND
C10
10 pF
C8
33 pF
C6
100 nF
C4
1
μ
F
+
C1
220
μ
F
TVS
VCC
GND
C9
10 pF
C7
33 pF
C5
100 nF
C3
1
μ
F
+
27, 33, 39,
45, 51, 57,
71, 73
70, 72, 74
PMU
Figure 4: Reference Design of VCC
3.3.2. Reference Design for Power Supply
The power source is critical to the module's performance. The power supply of the module should be able
to provide a sufficient current of 2 A at least and the peak current should be 3 A at least.
The following figure shows a reference design for +5.0 V input power source. The typical output of the
power supply is about 3.7 V.
D1
TVS
PWR_IN
C8
220
μ
F
C11
10 pF
C10
33 pF
C9
100 nF
+
R1
205K
U1
Q1
NPN
R8
47K
R7
4.7K
PWR_EN
R4
182K
PWR_OUT
L1
1.5
μ
H
16
1
2
15
6
7
8
9
10
11
12
13
14
3
4
5
VIN
VIN
VIN
EN
VSNS
COMP
RT/CLK
SS
PH
PH
PH
BOOT
PWRGD
GND
GND
AGND
VFB
R5
330K 1%
R6
100K 1%
C6
100 nF
PWRGD
EP
17
R2
80.6K
C7
10 nF
R3
10K
C4
10 nF
C5
NM
VFB
C2
100 nF
C3
33 pF
C1
470
μ
F
+
Figure 5: Reference Design of Power Supply
To avoid corrupting the data in the internal flash, do not switch off the power supply when the module
works normally. Only after shutting down the module with FULL_CARD_POWER_OFF# or AT command,
can you cut off the power supply.
NOTE