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

VCC (3.7 V Typ.)

3.3.2. Reference Design for Power Supply

Power design for the module is important, as the performance of the module largely depends on the
power source. The power supply is capable of providing a sufficient current of at least 5.0 A. If the voltage
drop between the input and output is not too high, it is suggested that an LDO is used to supply 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 as the power supply.
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
100 μ F
1 μ F
100 nF
+
D1
C1
C3 C5
100 μ F
1 μ F
5.1 V
100 nF
Figure 6: Reference Circuit of VCC
R1
205k
R2
VFB
80.6k
R3 R4
10k 182k
Q1
NPN
C4 C7
C5
10 nF 10 nF
NM
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
L1
U1
μ
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
5G Module Series
RM510Q-GL Hardware Design
Module
ET
PMU
PWR_OUT
H
+
C8
C9 C10 C11
220 μF
100 nF 33 pF 10 pF
R5
374k 1%
R6
100k 1%
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