User's Manual

SIM7600SA-H_User Manual_V1.00
2017-10-11
Smart Machine Smart Decision
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3.1.2 Recommended Power Supply Circuit
It is recommended that a switching mode power supply or a linear regulator power supply is used.
It is important to make sure that all the components used in the power supply circuit can resist a
peak current up to 2A.
The following figure shows the linear regulator reference circuit with 5V input and 3.8V output.
DC INPUT
FUSE
U101 MIC29302
2
Vin
Vout
4
VBAT
C101
+
100uF
C102
1uF
1
On/Off
PWR_CTRL
3
FB
5
R101
100K
R103
+ C103
470R
C104
R102
47K
330uF
100nF
Figure 7: Linear regulator reference circuit
If there is a big voltage difference between input and output for VBAT power supply, or the
efficiency is extremely important, then a switching mode power supply will be preferable. The
following figure shows the switching mode power supply reference circuit.
DC INPUT
U101
LM2596-ADJ
L101
FB101
VBAT
FUSE
C101
+
C102
100uF
1uF
1
Vin Vout
2
5
On/Off
FB
4
D102
100uH
R101
2.2K
C103
+
270 ohm@100Mhz
C104
PWR_CTRL
3
MBR360
330uF
100nF
R102 1K
Figure 8: Switching mode power supply reference circuit
Note: The Switching Mode power supply solution for VBAT must be chosen carefully against
Electro Magnetic Interference and ripple current from depraving RF performance.
3.1.3 Voltage Monitor
To monitor the VBAT voltage, the AT command “AT+CBC” can be used.
For monitoring the VBAT voltage outside or within a special range, the AT command
“AT+CVALARM” can be used to enable the under-voltage warning function.
If users need to power off SIM7600SA-H, when the VBAT voltage is out of a range, the AT
command “AT+CPMVT” can be used to enable under-voltage power-off function.
Note: Under-voltage warning function and under-voltage power-off function are disabled by
default. For more information about these AT commands, please refer to Document [1].
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