Power Supply; Decrease Voltage Drop - Quectel RM510Q-GL Hardware Design

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3.3. Power Supply

The following table shows pin definition of VCC pins and ground pins.

Table 7: Definition of VCC and GND Pins

Pin Name

2, 4, 70, 72, 74

VCC

3, 5, 11, 27, 33,

39, 45, 51, 57,

GND

71, 73

The input 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

Figure 5: Power Supply Limits during Radio Transmission

To decrease voltage drop, two 100 µF with low ESR should be used, and some multi-layer ceramic chip

capacitor (MLCC) array also should be used due to its ultra-low ESR. These capacitors should be close to

VCC pins and the width of VCC trace should be no less than 2 mm. In principle, the longer the VCC trace

is, the wider width 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.

RM510Q-GL_Hardware_Design

I/O

Burst Transmission

RM510Q-GL Hardware Design

Description

Power supply

Ground

Burst Transmission

Voltage Ripple < 100 mV

Voltage Drop < 165 mV

5G Module Series

DC Characteristics

3.135–4.4 V

3.7 V typical DC supply

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