Quectel SG368Z Series

Smart Module Series
SG368Z_Series_Hardware_Design 34 / 113
3 Operating Characteristics
3.1. Power Supply
3.1.1. Power Supply Interface
The module provides 8 VBAT pins dedicate to connecting with the external power supply. The power
supply range of the module is 3.3–3.5 V, and the recommended value is 3.4 V.
Table 7: VBAT and GND Pins
3.1.2. Reference Design for Power Supply
Power design for the module is essential. The power supply of the module should be able to provide
sufficient current of 3 A* at least. If the voltage difference between input voltage and the supply voltage is
small, it is suggested to use an LDO; if the voltage difference is big, a buck converter is recommended.
The following figure shows a reference design for LDO power supply:
DC_IN
C1
C2
U1
IN
OUT
EN
GND
ADJ
2 4
1 3 5
VBAT
100 nF
C3
470 μF
C4
100 nF
R2
220K
100K
R3
470 μF
470R
51K
R4
R1
1 %
1 %
Figure 2: Reference Design of Power Input
Pin Name
Pin No.
I/O
Description
Comment
VBAT
147, 148, 151, 152, 153, 156, 157, 161
PI
Power supply
for the module
GND
142, 143, 144, 146, 149, 154, 158, 162, 166
Ground