LTC4266A/LTC4266C

1

4266acfc

APPLICATIONS

FEATURES

DESCRIPTION

Quad PoE/PoE+/LTPoE++

PSE Controller

controller capable of delivering up to 90W of LTPoE++

power to a compatible LTPoE++ powered device (PD). A

proprietary detection/classification scheme allows mutual

identification between a LTPoE++ PSE and LTPoE++ PD

while remaining compatible and interoperable with existing

Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A

feature set is a superset of the popular LTC4266. These

0.25Ω sense resistors which are especially important at

the LTPoE++ current levels to maintain the lowest possible

heat dissipation.

The LTC4266C targets fully automatic PSE systems power-

ing Type 1 (up to 13W) PDs.

Advanced power management features include: 14-bit

current monitoring ADCs, DAC-programmable current

limit, and versatile quick shutdown of preselected ports.

Advanced power management host software is available

under a no-cost license. PD discovery uses a proprietary

dual-mode 4-point detection mechanism ensuring excellent

immunity from false PD detection. The LTC4266 includes

The LTC4266 is available in multiple power grades al-

lowing delivered PD power of 13W, 25W, 38.7W, 52.7W,

70W and 90W. These controllers are available in a 38-lead

5mm × 7mm QFN package.

0.25Ω Sense Resistance Per Channel

2-Point Forced Voltage

2-Point Forced Current

LTC4266A-1: LTPoE++™ 38.7W

LTC4266A-2: LTPoE++ 52.7W

LTC4266A-3: LTPoE++ 70W

LTC4266A-4: LTPoE++ 90W

LTC4266C: PoE 13W

TYPICAL APPLICATION

Complete 4-Port Ethernet High Power Source

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

LTPoE++ and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

4266 TA01

SCL

SDAIN

SDAOUT

AD0

AD1

AD2

AD3

–50V

1μF

SMAJ58A

GATE1 OUT1

OUT2

OUT3

SENSE2 GATE2

SENSE3 GATE3

SENSE4 GATE4 OUT4

PORT1

–50V

0.22μF 100V

4

S1B

4

S1B

4

PORT2

PORT3

PORT4

DGND

INT

SHDN1 SHDN2

AUTO

MSD

RESET

SHDN3 SHDN4

MID

0.1μF

3.3V

LTC4266