90 watts Quad/Single PoE controller chips from Linear

Linear Technology Corporation has introduced the LTC4266A and LTC4274A, 4-port and single-port Power over Ethernet (PoE) controllers for Power Sourcing Equipment (PSE), delivering up to 90W of power to Powered Devices (PDs).

The LTC4266A and LTC4274A are compliance with LTPoE++ & IEEE 802.3at Type 1 & 2 and also offers interoperability with existing IEEE PoE standards.

Linear says it offers power levels of 35W, 45W, 70W and 90W, so that discrete components and magnetics can be sized accordingly, minimizing total solution costs. Low power 13W versions, the LTC4266C and LTC4274C, are available for fully automatic Type 1 PoE systems.

The other features of LTC4266/LTC4274 as per Linear Tech includes:
Low Power Dissipation
0.25Ohm Sense Resistance per Channel
Very High Reliability 4-Point PD
Detection:
2-Point Forced Voltage
2-Point Forced Current
High Capacitance Legacy Device Detection
1 MHz I²C Compatible Serial Control Interface
Midspan Backoff Timer
Supports 2-Pair & 4-Pair Output Power
Operating Current: 1.1mA

According to Linear Technology PSE controllers provide advanced power management that includes prioritized fast shutdown, accurate 14.5-bit per-port voltage and current read back, 8-bit programmable current limits and 7-bit programmable overload current limits.

The LTC4266A and LTC4274A enabled high power PoE application such as long-range wireless access points (WAP), thin clients and heated surveillance cameras.

Availability: Now in production volumes.
Package: RoHS-compliant 5mm x 7mm QFN-38 package.
Price: $5.00 and $4.50 each of 1K units.

For more information, visit www.linear.com/