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BQ24295：关于使用这个芯片的一些疑问

Qin Qin
Prodigy 10 points
Part Number: BQ24295

Tool/software:

关于使用BQ24295芯片，有一些问题
目前对这个芯片的使用和设计是：打算做一个物联网设备，这个芯片来对系统的电源进行管理，外部电源经过一个DC-DC之后输出5V电压到芯片的VBUS引脚，给芯片供电，芯片的BAT引脚接上一个输出为4.2V电压的电池，整个系统的负载（主要是MCU和4G模块）都接到芯片的PMID引脚，负载最大电流会有1A以上，不知道在使用这个芯片时这样的设计是否合理？
以及现在出现的一个问题是：
当有接电池和充电电源时，拔掉充电电源，芯片的PMID引脚输出的电压会有一个压降，这个电压降低到了负载能够正常工作的电压，导致负载重启，有这个压降是正常的吗

  • 0
    TI__Guru** 105760 points

    Hello,

    It seems you are trying to supply your system from PMID, which is not the intended use case for the OTG operation. There will be voltage drop when VBUS is removed and the charger transitions to boost mode. If you need stable voltage the VSYS pin should be used with a boost converter to get 5V for the system.

    Sincerely,

    Wyatt Keller