Specifications

Smart Machine Smart Decision
SIM7080G _Hardware Design _V1.03 21 2019-12-13
3 Interface Application
3.1 Power Supply
Pin 34 and pin 35 are VBAT powerinput.
On VBAT pads, when module works on CAT-M1 or NB-IoT mode, the ripple current is up to 0.5A
typically. For steadyvoltage, the power supplycapabilitymust be up to 0.5A.
Table 6: VBAT pins electronic characteristic
Symbol
Description
Min.
Typ.
Max.
Unit
VBAT
Module power voltage
2.7
3.8
4.8
V
I
VBAT(peak)
Module power peak current in CAT-M1 and NB-IoT
emission mode.
-
0.5
-
A
I
VBAT(average)
Module power average current in normal mode
Please refer to the chapter 5.4
I
VBAT(sleep)
Power supply current in sleep mode
I
VBAT(power-off)
Module power current in power off mode.
-
-
15
uA
I
VBAT(PSM)
Module power current in PSM mode.
-
3
-
uA
3.1.1 Power Supply Design Guide
In the user's design, special attention must be paid to the design of the power supply to ensure that
the drop of VBAT is not less than 2.5V even when the module's current consumption reaches the
instantaneous maximum. If the voltage drop is less than 2.5V, the module may shut down due to the
low voltage.
The following figure shows the recommended circuit.
VBAT
VBAT
GND
MODULE
FB101
TVS
VBAT
Cb
100uF
1uF
Ce Cc
100uF
Ca
Cd
100uF
100nF
GND
Figure 6: Power supply application circuit
In addition, for ESD protection, it is suggested to add a TVS diode near the VBAT PINs. These
capacitors should be put as close as possible to VBAT pads. Also,users should keep VBAT trace on
circuit board wider than 1 mm to minimize PCB trace impedance.