Hardware Reference Design; Power Supply; Operating Voltage; Power Supply Reference Design - Quectel BC66 Manual

4

Hardware Reference Design

The following chapters describe the compatible design of BC66 and BC660K-GL in terms of their main
application functions and interfaces.

4.1. Power Supply

4.1.1. Operating Voltage

The power supply ranges of BC66/BC660K-GL are listed below:
Table 6: Module Operating Voltage Range
Module Power Supply Pins
VBAT_BB &
BC66
VBAT_RF
BC660K-GL VBAT
When considering the compatible design of the modules, make sure the input voltage is 2.2–3.63 V.
Ensure the module's input voltage never drops below 2.2 V during operation.
VBAT

4.1.2. Power Supply Reference Design

Power design for a module is critical to its performance. It is recommended to use a low quiescent current
LDO with an output capacity of 0.5 A to regulate the power supply for both BC66 and BC660K-GL.
To ensure better power supply performance and compatibility, the recommended input voltage is 3.3 V.
Also, it is recommended to add 100 μF, 100 nF, 100 pF and 22 pF capacitors near the VBAT pins of BC66
BC66&BC660K-GL_Compatible_Design
Min. Typ.
2.1 3.3
2.2 3.3
Figure 2: VBAT Voltage Waveform Diagram
BC66&BC660K-GL Compatible Design
Max. Unit Conditions
The actual input voltages must
3.63 V
stay between the minimum and
maximum values.
4.3 V
NB-IoT Module Series
V
drop
15 / 30