Datasheet

LTC4266A/LTC4266C

4266acfc

OPERATION

Extended Power LTPoE

The LTC4266A adds the capability to autonomously deliver

up to 90W of power to the PD. LTPoE

PDs may forgo

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 PAIRS PD POWER

LTC4266A-1 4 38.7W

LTC4266A-2 4 52.7W

LTC4266A-3 4 70W

LTC4266A-4 4 90W