User's Manual

N
720 Hardware User Guide
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preferable if used in harsh conditions. You can use the EN pin on the LDO or DC/DC chipset to
control the switch of the power supply as shown inFigure 2-4if a 5V power supply is used.
MIC29302WU in Figure 2-4 is an LDO and outputs 3 A current to ensure the performance of the
module.
Figure 2-4 Reference design of power supply control
The alternative way is to use an enhancement mode p-MOSFET to control the module's power,
as shown inFigure 2-5. When the external MCU detects the exceptions such as no response
from the module or the disconnection of GPRS, power off/on can rectify the module exceptions.
InFigure 2-5, the module is turned on when PWR_EN is set to high level.
Figure 2-5 Reference design of power supply controlled by p-MOSFET