Smart Machine Smart Decision
SIM5360_Hardware Design_V1.01
2013-11-22
22
Figure 8: VBAT input application circuit
There are three sections about how to design and optimize users’ power systems.
Power supply circuit
We 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 4.1V, here a linear regulator can be
used.
Vin
Vout
ON/
OFF
GND
FB
3
+
PWR_CTRL
R102
R101
FB101
VBAT
100K
43K
270 OHM
+
C103
330uF
C104
100nF
U101 MIC29302
5
4
1
2
C101
C102
100uF
1uF
DC INPUT
Figure 9: Reference circuit of the LDO power supply
If there is a big difference between the input voltage and the desired output (VBAT), a switching converter
power will be preferable because of its better efficiency, especially at the high current situation. The
following figure is the reference circuit. Note that DCDC may deprave RF performance because of ripple
current intrinsically.