Users Manual
LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design
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3.6. Power Supply
3.6.1. Power Supply Pins
EC25 provides four VBAT pins for connection with the external power supply. There are two separate
voltage domains for VBAT.
Two VBAT_RF pins for module’s RF part
Two VBAT_BB pins for module’s baseband part
The following table shows the details of VBAT pins and ground pins.
Table 6: VBAT and GND Pins
3.6.2. Decrease Voltage Drop
The power supply range of EC25 is from 3.3V to 4.3V. Please make sure that the input voltage will never
drop below 3.3V. The following figure shows the voltage drop during burst transmission in 2G network.
The voltage drop will be less in 3G and 4G networks.
Figure 7: Power Supply Limits during Burst Transmission
Pin Name Pin No. Description Min. Typ. Max. Unit
VBAT_RF 57, 58
Power supply for module’s RF
part
3.3 3.8 4.3 V
VBAT_BB 59, 60
Power supply for module’s
baseband part
3.3 3.8 4.3 V
GND
8, 9, 19, 22, 36,
46, 48, 50~54,
56, 72, 85~112
Ground - 0 - V