Green-mode controllers deliver PoE more efficiently

Texas Instruments (TI) has introduced two power management integrated circuits (ICs) that combine a Power over Ethernet (PoE) powered device (PD) manager with a DC/DC controller.

According to TI, the TPS23751 and TPS23752 controllers deliver high conversion efficiency over a wide load range and light load efficiency that is 20-percent higher than other solutions on the market. The ICs are designed for use in IEEE 802.3at type 2 (high-power) compliant PoE designs, used in IP phones, surveillance cameras, wireless access points, as well as various industrial applications.

See also:Charge your iPad using PoE

According to TI, key features and benefits of the TPS23751 and TPS23752 devices include:

-- IEEE 802.3at type 2 compliant: Both devices generate up to 25.5-W to the PoE loads.

-- Highly efficient Green-mode operation: During light load conditions, both devices switch off the synchronous rectifier and go into variable frequency operation. This feature enables efficiencies greater than 80 percent at 20 percent load operation and maintains high efficiency from very light to full load.

-- Integrated DC/DC controller converts input voltage to 3.3-V, 5-V or 12-V.

-- Deep sleep capability saves energy (TPS23572): The sleep-mode feature continues generating the maintain power signature after disabling the converter to minimize power consumption.

For more information and to order samples, visit www.ti.com/poe-pr.

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