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CLM920_NC3_LTE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 15 of 37
Figure 3-3 LDO power reference circuit
Figure 3-4 DCDC power supply reference circuit
Figure 3-5 MOS tube control power switch reference circuit
1. To prevent damage to the module caused by surge and overvoltage, it is recommended to connect a
5.1V/500mW Zener diode in parallel with the VBAT pin of the module.
2. It is recommended to add 3 ceramic capacitors (33pF, 10pF, 100nF) to the VBAT pin and place them near
the VBAT pin.
3. The minimum working voltage of the module is 3.3V. Since the transmission data or GSM call will