Quectel 5G Module Series Hardware Design

5G Module Series
RM500Q-AE&RM502Q-AE Hardware Design
RM500Q-AE&RM502Q-AE_Hardware_Design 28 / 86
3.3. Power Supply
The following table shows pin definition of VCC pins and ground pins.
Table 7: Definition of VCC and GND Pins
3.3.1. Decrease Voltage Drop
The power supply range of the module is from 3.135 V to 4.4 V. Please ensure that the input voltage will
never drop below 3.135 V, otherwise the module will be powered off automatically. The voltage ripple of
the input power supply should be less than 100 mV, and the voltage drop should be less than 165 mV.
VCC 3.7 V
Burst Transmission
Voltage Ripple
< 100 mV
Voltage Drop < 165 mV
Burst Transmission
Figure 5: Power Supply Limits during Radio Transmission
Ensure the continuous current capability of the power supply is 3.0 A. To decrease the voltage drop, two
bypass capacitor of about 220 µF with low ESR (ESR = 0.7 Ω) should be used. To decrease the power
supply is disturbed, a multi-layer ceramic chip capacitor (MLCC) array also should be used due to its
ultra-low ESR. It is recommended to use four ceramic capacitors (1 µF, 100 nF, 33 pF, 10 pF) for
composing the MLCC array, and place these capacitors close to VCC pins. The width of VCC trace
should be no less than 2.5 mm. In principle, the longer the VCC trace is, the wider it should be.
In addition, to get a stable power source, it is recommended to use a zener diode with reverse zener
voltage of 5.1 V and dissipation power of more than 0.5 W.
Pin
Pin Name
I/O
Description
DC Characteristics
2, 4, 70, 72, 74
VCC
PI
Power supply
3.135–4.4 V
3.7 V typical DC supply
3, 5, 11, 27, 33, 39, 45,
51, 57, 71, 73
GND
Ground

Quectel 5G Module Series Specifications

General

Brand	Quectel
Model	5G Module Series
Category	Motherboard
Language	English