User's Manual

Smart Machine Smart Decision
SIM7600SA-H_User Manual_V1.00 2017-10-11
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.
Vin
Vout
GND
FB
3
+
PWR_CTRL
R102
R101
VBAT
100K
47K
+
U101
MIC29302
5
4
1
2
C101 C102
100uF
1uF
DC INPUT
R103
470R
On/Off
FUSE
C103
330uF
C104
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.
FUSE
Vin
Vout
FB
U101
1
2
3
4
5
LM2596- ADJ
+
100uH
MBR360
L101
C101
+
C102
D102
C103
R102
R101
FB101
330uF
VBAT
2.2K
1K
100uF
1uF
C104
100nF
270 ohm@100Mhz
DC INPUT
PWR_CTRL
GND
On/Off
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].