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BQ24253: BQ25606

yunfeng wang
Part Number: BQ24253
Other Parts Discussed in Thread: BQ25606

目前我使用的器件为BQ24253，通过Vsys为系统供电，输入电流限制为2A，充电电流也是2A，实测充电可以达到2A。设备的最大电流为1.8A（峰值），在设备的使用过程中，发现只插电池的情况下设备工作正常，负载工作情况良好，能达到最大电流值。但是只插适配器的情况下发现当处于峰值工作电流时，设备工作不正常（适配器5V4A）。下一版打算用bq25606，3A的电池管理芯片，请问这种带电源管理路径的电池管理IC在只插适配器的情况下是否能达到标称的电流，还是必须有电池才能达到。因为我想让我的设备即能用适配器独立工作，又能只用电池。

综上，为什么bq24253只插适配器的情况下Vsys带不动载，只插电池可以。还有就是更换bq24253是否可行。谢谢大家。

  • 0
    TI__Guru*** 130456 points

    您好，请参考下面的内容：

    The bq24253 uses the D+/D- lines at startup to set the input current limit. For example, if IN and D+/D- are connected to a USB SDP port, the input current limit would be set to 100mA. If you want to set the input current to a different level (per d/s table 1), you have to toggle EN1/EN2 as explained in flow diagram of figure 18. For your desired maximum 2A current output, I assume you have a 5-V power source (e.g. wall adapter) capable of providing that much output current? If so, then you could tie D+=D-, which should force the input current limit to the maximum as set by the ILIM resistor (or short ILIM to ground to set to maximum per d/s table 2). As a redundancy, you could set EN2=0 and EN1=1.