MP8005 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER
MP8005 Rev. 1.0 www.MonolithicPower.com 10
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is very important in that it prevents cross
conduction of the switching MOSFETS that either
severely reduces efficiency or even worse, a
switching MOSFET failure.
The output drive levels of the main and
synchronous gate are in the hundreds of mA
through a 0 to 10V voltage potential. A “normal”
threshold MOSFET (Vth typ. 3.5V) having low
gate charge (less than 10 nano-Coulombs @
10V drive) is recommended.
The nominal range of the ISENSE pin is set to a
maximum of 200mV but should be designed such
that 100mV across the sense resistor provides
the maximum current that is expected for the
nominal load. This will provide enough
“headroom” for typical applications.
