What are the considerations for Tuya's NB module power supply design?

NM1 can use LDO with low quiescent current and output current capability up to 0.5A as power supply, and also supports lithium-ion battery power supply; its power input voltage range is 2.1V~3.63V. When the module is working in digital transmission, it must be ensured that the power drop is not lower than the minimum working voltage of the module 2.1V, otherwise the module will be abnormal. In order to ensure better power supply performance, it is recommended to connect a 100uF tantalum capacitor with low ESR (ESR=0.7Ω) and 100nF, 100pF (0402 package) and 22pF (0402 package) filter capacitors in parallel near the VBAT input of the module. At the same time, it is recommended to add a TVS tube close to the VBAT input to improve the surge voltage tolerance of the module. In principle, the longer the VBAT trace, the wider the line width.