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ADCMP581 Power Consumption

I just wanted to ask the total power consumed by ADCMP581.

As per data-sheet:

Positive Supply Current: IVCCI: VCCI = 5.0 V, 50 Ω to −2 V: 6 mA
Negative Supply Current: IVEE: VEE = −5.0 V, 50 Ω to −2 V: −25 mA
Power Dissipation: PD: 50 Ω to −2 V: 155 mW

My question is, what about power dissipation, This can not be from supply current as it is only 129mW, and also it has to drive a 40 mA current at output.

So, where this dissipated power is coming from?