Reference Design For Power Supply - Quectel BC950N-N1 Hardware Design

2, 7, 9, 43, 47,
48, 51, 52, 54,
GND
59~66, 71~74,
81~83, 92~94

3.5.2. Reference Design for Power Supply

Power design for a module is critical to its performance. It is recommended to use a low quiescent current
LDO with output current capacity of 0.5A as the power supply for BC950N-N1. A Li-MnO2/2S alkaline
battery can also be used as the power supply. The supply voltage of the module ranges from 3.4V to 4.6V.
When the module is working, please make sure its input voltage will never drop below 3.4V; otherwise the
module will be abnormal.
For better power performance, it is recommended to place a 100uF tantalum capacitor with low ESR
(ESR=0.7Ω) and three ceramic capacitors (100nF, 100pF and 22pF) near the VBAT pins. Also, it is
recommended to add a TVS diode on the VBAT trace (near VBAT pins) to improve surge voltage
withstand capability. In principle, the longer the VBAT trace is, the wider it should be. A reference circuit
for power supply is illustrated in the following figure.
NOTE
To decrease the voltage drop, it is recommended to connect a large-capacitance capacitor to VBAT. If the
load capacity of power supply is insufficient, then a 100uF tantalum capacitor is recommended.
BC950N-N1_Hardware_Design
GND
VBAT
+
C1 C2
D1
TVS
100uF 100nF
GND
Figure 5: Reference Circuit for Power Supply
BC950N-N1 Hardware Design
Module
VBAT_RF
VBAT_BB
C3 C4
100pF 22pF
0402 0402
GND
LPWA Module Series
23 / 59