5V VCC供电的时候是吗?参考datasheet 9.1 Sequencing VIO and VCC部分的介绍:In conditions when VIO is connected to the same 5V source as VCC, the power supply must be able to source at least 400mA of current。
另外,datasheet中还详细介绍了各个模块的最大电流,包括Boost power supply最大电流限制在150mA,激励电流最大限制在145mA 等: