ltc4266a Linear Technology Corporation, ltc4266a Datasheet - Page 17

• Manufacturer Part Number: ltc4266a
• Description: Quad Poe/poe+/ltpoe++ Pse Controller
• Manufacturer: Linear Technology Corporation

OPERATION
Extended Power LTPoE ++
The LTC4266A adds the capability to autonomously deliver
up to 90W of power to the PD. LTPoE ++ PDs may forgoe
802.3 LLDP support and rely solely on the LTPoE ++ Physi-
cal Classification to negotiate power with LTPoE ++ PSEs;
this greatly simplifies high-power PD implementations.
LTPoE ++ classification may be optionally enabled for the
LTC4266A by setting both the High Power Enable and
LTPoE ++ Enable bits.
The higher levels of LTPoE ++ delivery impose additional
layout and component selection constraints. The LTC4266A
is offered in 4 power levels (-1, -2, -3, and -4) which
allows the AUTO pin mode LTC4266A to autonomously
power up to supported power levels. If the AUTO pin is
high, internal circuitry determines the maximum deliver-
able power. PDs requesting more than the available power
limits are not powered.
Table 1. LTPoE ++ Auto Pin Mode Maximum Delivered
Power Capabilities
PART
LTC4266A-1
LTC4266A-2
LTC4266A-3
LTC4266A-4
LTC4266A/LTC4266C
PAIRS
2
2
4
4
PD POWER
35W
45W
70W
90W
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