bq2420x
SINGLE-CHIP LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR CURRENT-LIMITED APPLICATIONS
文档中有这样的描述：
Following a successful pre-conditioning, the bq2420x relies on an external current-limited supply to limit the
charge current to the cell. The bq2420x continues this phase until the battery reaches the voltage regulation
phase.
During this phase (and all other phases of operation) in order to protect the integrated powerFET, the internal
short circuit and thermal protection circuits are active.
这段描述是说最大充电电流500mA要靠外部充电电源来限制？否则只能限制为短路电流值（参数表中为1~1.6A）？不过看器件的电路原理框图，有个内部Iref控制呀，这个应该是用来限流500mA的吧？
那么如果外部电源本身限流值为1000mA，那么能不能用来充电呢？芯片能不能限制为500mA正常充电而芯片本身也不会损坏？
