Reference Design For Power Supply - Quectel 5G Module Series Hardware Design

VCC (3.7 V Typ.)
+
+
D1
5.1 V

3.3.2. Reference Design for Power Supply

Power design is critical as the module's performance largely depends on its power source. If the voltage
difference between the input and output is not too big, it is suggested that an LDO is used when 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 for +5.0 V input power source based on a DC-DC
converter. The typical output of the power supply is about 3.7 V and the maximum load current is 3.0 A.
PWR_IN
+
D1
C1 C2 C3
470 μF
TVS
100 nF 33 pF
R7
4.7k
PWR_EN
R8
47k
RM500Q-AE&RM502Q-AE_Hardware_Design
C2
C4 C6
220 μF
1 μF
100 nF
C1
C3 C5
220 μF
1 μF
100 nF
Figure 6: Reference Circuit for VCC
VIN
VIN
R1
VIN
205k
EN
R2 VFB VSNS
COMP
80.6k
RT/CLK
SS
R3 R4
10k 182k
Q1
NPN
C4
C5 C7
10 nF
NM 10 nF
Figure 7: Reference Circuit for Power Supply
RM500Q-AE&RM502Q-AE Hardware Design
VCC 2, 4
C8 C10
33 pF 10 pF
GND
3, 5, 11
VCC 70, 72, 74
C7 C9
33 pF 10 pF
27, 33, 39,
GND
45, 51, 57,
71, 73
L1
U1
μ
1.5
PH
PH
C6
PH
100 nF
BOOT
PWRGD
PWRGD
GND
GND
AGND
EP
VFB
5G Module Series
Module
ET
PMU
H
+
C8
C9 C10 C11
220 μF
100 nF 33 pF 10 pF
PWR_OUT
R5
374k 1%
R6
100k 1%
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