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OPA2210: OPA2210的热焊盘是接GND 还是 V-

Part Number: OPA2210
Other Parts Discussed in Thread: OPA277

OPA2210 的 SON8封装的热焊盘设计时接的GND,供电±12V,上电后-12V电流特别大一般在28mA以上,有时候在100多mA,实际单个芯片测试后发现,热焊盘不接和接到-12V上,静态工作电流都是4.5mA(手册为2.2mA,2个通道刚好是4.6mA),我想请教这个热焊盘到底是接V- 还是不接悬空呢?都有啥影响?