Interface Application; Power Supply - SimCom SIM7000 Hardware Design

3

Interface Application

3.1

Power Supply

Pin 55, pin 56 and pin 57 are VBAT power input.
On VBAT pads, when module works on CAT-M1 or NB-IoT mode, the ripple current is up to 0.6A
typically. For steady voltage, the power supply capability must be up to 0.6A.
On VBAT pads, when module works on EDGE or GPRS mode, he ripple current is up to 2A
typically. For steady voltage, the power supply capability must be up to 2A.
in order to avoid the voltage dropped down more than 300mV, the load capacitor on VBAT pads
must be up to 300uF.
The following figure shows the VBAT voltage ripple wave at the maximum power transmit phase
in EDGE/GPRS emission mode.
577us
I
VBAT
VBAT
Figure 5: VBAT voltage drop during burst emission (EDGE/GPRS)
Note: The test condition: The voltage of power supply for VBAT is 3.8V, Ca=100 µF tantalum
capacitor (ESR=0.7Ω) and Ce =100nF (Please refer to Figure 6—Application circuit).
Table 6: VBAT pins electronic characteristic
Symbol Description
VBAT Module power voltage
Module power peak current in GSM and EDGE
mode.
I
VBAT(peak)
Module power peak current in CAT-M1 and NB-IoT
emission
I Module power average current in normal mode
VBAT(average)
I Power supply current in sleep mode
VBAT(sleep)
I Module power current in power off mode.
VBAT(power-off)
SIM7000 _Hardware Design _V1.04
4.615ms
mode.
Smart Machine Smart Decision
Min. Typ.
3.0 3.8
emission
- 2
- 0.6
Please refer to the chapter 5.4
- -
Burst:2A
Max:300mV
Max. Unit
4.3 V
- A
- A
7 uA
2018-1-31