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关于LM2940CS-5.0的使用问题?

我选用了LM2940CS-5.0,需要一个稳定的5V电压输出, 那我的输入电压最低要选多少V 啊?也就是我的输入电压和5v输出电压之间的压差至少要多少V?

我查了数据手册, 有一个地方说要    Output Voltage    5 mA ≤ IO ≤ 1A         6.25V ≤ VIN ≤ 26V

另外一个地方说:

Dropout Voltage  IO = 1A             0.5     0.8/1.0      V
                               IO = 100 mA   110    150/200 mV

那到底是输入电压要6.25V还是 5+0.8V=5.8V就可以了?