Reference Design For Power Supply - Quectel RM510Q-GL Hardware Design

In addition, to guarantee stability of the power supply, please use a zener diode with a reverse zener
voltage of 5.1 V and a dissipation power of higher than 0.5 W.
The following figure shows a reference circuit for the VCC.
VCC (3.7 V Typ.)
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. The power
supply of the module should be able to provide a sufficient current of 5.0 A at least. If the voltage drop
between the input and output is not too big, use an LDO when supplying power to the module. If there is a
big voltage difference between the input source and the desired output (VCC = 3.7 V typical), 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 5.0 A.
PWR_IN
+
D1 C1 C2 C3
470 μF
TVS
100 nF 33 pF
R7
4.7k
PWR_EN
R8
47k
RM510Q-GL_Hardware_Design
+
C2
C4 C6
220 μF
1 μF
100 nF
+
D1 C1
C3 C5
220 μF
1 μF
100 nF
Figure 6: Reference Circuit of VCC
R1
205k
R2 VFB
80.6k
R3 R4
10k 182k
Q1
NPN
C4
C5
NM 10 nF 10 nF
Figure 7: Reference Circuit of Power Supply
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
U1
1.5
VIN PH
VIN PH
C6
VIN PH
100 nF
EN BOOT
VSNS PWRGD
PWRGD
COMP GND
RT/CLK GND
SS AGND
EP
VFB
C7
5G Module Series
RM510Q-GL Hardware Design
Module
ET
PMU
L1
μ
H
+
C8
C9 C10
220 μF
100 nF 33 pF 10 pF
PWR_OUT
R5
C11
374k 1%
R6
100k 1%
29 / 87