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Enquiry related LTC4271/ LTC4290 PSE controller


We are planning to use 8 port LTC4271/LT4290 PSE controller in our embedded video recorder.

Will you please suggest how much current is required? Also please explain why negative VEE is required for this chip?

Can't we provide positive 48V to LTC4290 chip?how much current does it consume because we need to select DC-DC converter according to that whether we need inverter or not.