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Smart Machine Smart Decision
SIM5360_Hardware Design_V1.06
2016-11-17
22
For the consideration of RF performance and system stability, some multi-layer ceramic chip (MLCC)
capacitors (0.1/1uF) need to be used for EMC because of their low ESR in high frequencies. Note that
capacitors should be put beside VBAT pins as close as possible. Also User should minimize the PCB trace
impedance from the power supply to the VBAT pins through widening the trace to 80 mil or more on the
board. The following figure is the recommended circuit.
In addition, in order to get a stable power source, it is suggested to use a zener diode of which reverse
zener voltage is 5.1V and dissipation power is more than 500mW.
Table 7: Recommended zener diode models
No.
Manufacturer Part Number
Power
Package
1
On semi
MMSZ5231BT1G
500mW
SOD123
2
Prisemi
PZ3D4V2H
500mW
SOD323
3
Vishay
MMSZ4689-V
500mW
SOD123
4
Crownpo
CDZ55C5V1SM
500mW
0805
VBAT
VBAT
VBAT
VBAT
62
63
38
39
C105
C104
100uF
100nF
61
64
GND
GND
37
40
GND
GND
MODULE
CA
CB
FB101
5.1V
500mW
100uF
1uF
VBAT
Figure 8: VBAT input application circuit
There are three sections about how to design and optimize users’ power systems.
Power supply circuit
SIMCom recommend DCDC or LDO is used for the power supply of the module, make sure that the peak
current of power components can rise up to more than 2A. The following figure is the reference design of
+5V input power supply. The designed output for the power supply is 3.8V, here a linear regulator can be
used.
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