CLM920 TD3 LTE Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
- 30 -
Figure 3-5 DC switching power supply reference circuit
Figure 3-6 PMOS tube control power switch reference circuit
To prevent damage to the module from surges and overvoltages, it is recommended to
connect a 5.1V/500mW Zener diode to the VBAT pin of the module.
It is recommended to add 3 ceramic capacitors (33pF, 10pF, 100nF) to the VBAT pin and
place them near the VBAT pin.
The minimum operating voltage of the module is 3.3V. Since the transmission data or
GSM call will generate more than 2A current, the ripple voltage drop will occur on the
power supply voltage, so the actual supply voltage must not be lower than 3.3V.
