CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
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which will cause a large ripple on the power supply. If the instantaneous voltage drop causes
the VBAT supply voltage to be too low. Or the supply current is insufficient and the module
may shut down or restart. In order to ensure the normal operation of the module, all power
pins and ground pins must be connected and provide sufficient power supply capability.
Figure 3-2 GSM TDMA network burst current supply voltage drop
Under the premise of ensuring that the VBAT power supply is sufficient, two
470uF/6.3V tantalum capacitors can be connected in parallel with the power input, and then
10pF, 33pF, 0.1uF, 1uF ceramic capacitors can be connected.
Figure 3-3 VBAT power supply
3.3.2 Power reference circuit
The actual design of the power circuit can use a switching DC power supply or a linear
LDO power supply to design the VBAT power supply. Both design circuits need to supply
enough current. Specific reference to the following circuit design
：