Hardware Development Guide
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ME3630 mini-PCIE
ME3630 mini-PCIE
Can provide well transient current under 2G weak signal environment to satisfy modules requirements, to prevent device shutdown
and ports re-enumeration as a consequence of the supply voltage drop.
The over-current capability requirement of DC/DC switching power supply need to be above 3A, for example, ZI1153, AAT2138 and
so on.
Input voltage range of ZI1153 is: 2.5
~
5.5V,output voltage range of ZI1153 is from 0.6V to VIN( input voltage).
Input voltage range of AAT2138is: 2.7
~
5.5V,output voltage range of AAT2138is from 3.3
~
5.5V.
As shown in the Figure below, use DC/DC switching power supply ZI1153 as the buck chip. Place a tantalum capacitor of 330μF at the
input of the chip. Place a 2200UF capacitor or place several 330μF tantalum capacitors in parallel. This circuit fully meets the module
power requirements. (If the user’s PCB size is limited, the output of buck chip can place three more 330μF tantalum capacitors of
which the total capacity is more than 1000μF)
Figure 5–3 DC/DC Switching Power Supply
Vin=5V
Vout=3.3V
Option two:
Use LDO as the buck chip. The over-current capability of LDO is above 3A. As the poor transient response of linear regulator, large
capacitors should be placed at the input and output of LDO. The output of LDO, place a capacitors above 2000μF. The reference
power supply circuit design with LDO is as shown in Figure below.
Figure 5–4 LDO Power Supply
NOTE: The resistor and capacitor in the Figure 5-3 and Figure 5-4 is just for example, the use need to choose the proper ones
according to the output voltage level.
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