MeiG
Product
Manual
of
SLM750
Module
SLM750
Module
Hardware
Design
Page 33, total 84 pages
Two VBAT_RF pins are used to supply RF power.
Two VBAT_BB pins are used to supply Baseband power.
Below table shows the assignment of power and ground pins:
Table 7: Related power supply interfaces
Pin name
Pin No.
Description
Min
value
Typical
value
Max
value
Unit
VBAT_BB 59,60
Power
supply
for module
baseband
3.3 3.8 4.2 V
VBAT_RF 57,58
Power
supply
for module
RF
3.3 3.8 4.2 V
GND
8,9,19,
22,36,46,48,50~54,
56,72,
85~112
Ground
-
0
-
V
3.6.2 Decrease voltage drop
The power supply range of SLM750 is from 3.3V to 4.2V. During data transmission or
conversation, instantaneous high-power emission will form a peak current up to 2A, which will lead
to a large ripple of VBAT. If instantaneous voltage drop leads to too low VBAT power supply
voltage, the module will shut down. Make sure there are sufficient power supply capabilities and
the input voltage will never drop below 3.3V to make the module work well.
The following figure shows the voltage drop during transmitting burst in 2G network. The
voltage drop will be less in 3G and 4G networks.
VBAT
Min.3.3V
Drop
Ripple