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BQ2057电池充电芯片发烫!!!



刚到官网申请3各样品,按照数据手册上搭建电路,输入电压9V(电表测量值为9.09V),充电电流测量值为720mA,5脚指示灯状态正确,而且MOS管发热也不是很烫,其驱动电压5.3V   电池为5700mAh   8.4V满充 

测量各管脚电压都没有问题 ,   5脚电压为3.5V    电池已经充到8V

但是 芯片摸上去很烫   这个现象正常吗?  而且比MOS还烫