Linear Technology Debuts LTC4267 POE PD Controller
Linear Technology Corp. (LTC, Milpitas, CA) introduced its new LTC4267, an IEEE 802.3af Power-over-Ethernet (PoE) controller, which features an integrated switching regulator to simplify powered-device (PD) design. Offered in a 3 mm x 5 mm DFN package, the IC ensures compliance with the IEEE 802.3af PoE standard and includes an onboard 25 kΩ signature resistor and classification current source.
The internal 100 V power MOSFET provides protection against inductive voltage spikes from long cables, while the low leakage prevents corruption of the 25 kΩ signature resistance. The LTC4267's dual-level inrush current limit allows for seamless interface with legacy PoE systems. The LTC4267 fits in PDs such as digital voice-over-IP phones, network wireless access points, security cameras, or any small Ethernet-connected device that requires less than 13 W.
The LTC4267 includes an on-board, constant-frequency, current-mode dc-dc controller, tailored to a wide variety of power supply voltage and load current requirements. Specified over the commercial and industrial temperature grades, pricing for the LTC4267 begins at $2.10 each for 1,000-piece quantities.
