Figure 6: Reference Circuit for VCC Pins
3.3.2. Reference Design for Power Supply
Power design is critical as the module’s performance largely depends on its power source. The power
supply of the module should be able to provide a sufficient current of 3.0 A at least. If the voltage
difference between input and output is not too big, use an LDO when supplying power to the module. If
there is a big voltage difference between the input source and the desired output (VCC = 3.7 V typical), a
buck DC-DC converter is preferred.
The following figure shows a reference design for +5.0 V input power source based on the DC-DC
converter. The typical output of the power supply is about 3.7 V and the maximum load current is 3.0 A.
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