LTE Standard Module Series
3.4. Power Supply
3.4.1. Power Supply Pins
The module provides four VBAT pins dedicated to the 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 power supply and GND pins.
Table 8: Pin Definition of Power Supply
3.4.2. Reference Design for Power Supply
The performance of the module largely depends on the power source. The power supply of the module
should be able to provide sufficient current of 3 A at least. If the voltage drops between input and output
is not too high, it is suggested that an LDO should be used to supply power to the module. If there is a
big voltage difference between input and the desired output VBAT, a buck converter is preferred as the
power supply.
The following figure shows a reference design for +5 V input power source. The design uses the LDO
MIC29302WU from Micrel company. The typical output of the power supply is about 3.8 V and the
maximum load current is 3.0 A.
Power supply for the
module’s baseband part
It must be provided with
sufficient current up to
0.8 A.
Power supply for the
module’s RF part
It must be provided with
sufficient current up to
1.8 A.
Provide 1.8V for external
circuit
It can provide a pull-up
power to the external
GPIO.
If unused, keep it open.
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