Reference Design Of Power Supply - Quectel EM06 Series Manual

VCC

3.4.2. Reference Design of Power Supply

Power design is critical as the module's performance largely depends on its power source. The power
supply should be capable of providing a sufficient current of 2 A at least. If the voltage drop between the
input and output is not too big, it is suggested that an LDO is used while supplying power for the module;
If there is a big voltage difference between the input source and the desired output (VCC = 3.7 V Typ.), a
buck DC-DC converter is preferred.
The following figure shows a reference design of a +5 V input power source with the DC-DC TPS54319.
The typical output of the power supply is about 3.7 V and the maximum load current is 3 A.
PWR_IN
+
D1 C2 C3
C1
470 μF
TVS
100 nF 33 pF
R7
4.7k
PWR_EN
R8
47k
NOTE
In order to avoid damages to the internal flash, please do not switch off the power supply directly when
the module is working. It is suggested that the power supply be cut off after pulling down the
FULL_CARD_POWER_OFF# pin for about 100 ms.
EM06_Series_Hardware_Design
+
D1
C2
C1 C3
1 uF
220 uF 100 nF
5.1 V
Figure 4: Reference Design of VCC
16
VIN
1
VIN
R1
2
VIN
205k
15
EN
6
R2 VFB VSNS
7
COMP
80.6k
8
RT/CLK
9
SS
R3 R4
10k 182k
Q1
NPN
C4
C5 C7
10 nF 10 nF
NM
Figure 5: Reference Design of Power Supply
VCC
C4 C5
33 pF 10 pF
L1
U1
μ
1.5 H
10
PH
11
PH
12 C6
PH
13
100 nF
BOOT
14
PWRGD
PWRGD
3
GND
4
GND
5
AGND
EP
17
VFB
LTE-A Module Series
EM06 Series Hardware Design
Module
+
C8 C11
C9 C10
220 μF
100 nF 33 pF 10 pF
VCC
R5
150k 1%
R6
43k 1%
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