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TI intros PoE manager for multiport systems

Posted: 14 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:PoE? Ethernet? power management? Texas Instruments? 802.3af?

Texas Instruments Inc. (TI) has introduced a fully integrated Power-over-Ethernet (PoE) management device, said to be the industry's first, that allows multiport enterprise systems to deliver up to 25W of power over a standard Ethernet cable.

Supporting operation at -40C to 125C, this PSE" target=_blank>power source equipment (PSE) manager enables commercial, industrial, medical and military applications to manage Ethernet-powered devices using nearly twice the power as previous IEEE 802.3af-compliant systems.

TI said its TPS23841 quad-port PoE IC provides power management control and protection, while safely delivering up to 665mA per port from input voltage levels of 21.5-57V. The device's extremely wide input voltage capability allows designers to support emerging Ethernet-powered 24V medical and industrial applications, such as nurse call center systems and human machine-interaction equipment.

The TPS23841 simplifies PoE design by integrating several key components onto a single chip, including integrated switches and sense resistors and four individual 15bit ADC, which allows the device to accurately measure signature resistance, voltage, current and die temperature. The device can be designed together with TI's TPS2384 PSE manager to enable high power and standard PoE operation in a system running on the same comprehensive software. The TPS23841 also provides three different optionsautomatic mode, semi-auto mode or manual operationthat give designers added flexibility to meet specific PoE system requirements. While in manual mode, the TPS23841 can work with an MCU, such as TI's ultralow-power MSP430, to detect legacy capacitance loads.

The TPS23841 high-power PoE device matches the power requirements of TI's recently introduced 8-pin, TPS2376-H controller for Ethernet-powered devices. This controller contains the safety features needed to develop a powered device with programmable, 600mA current limit and thermal shutdown, auto-retry and fault protection. It also allows a designer to implement a non-standard powered device that draws up to 26W of power from PSE with a minimum of 52V of input and over 100m of CAT-5 Ethernet cable. The controller and the TPS23841 manager are both compatible with the recent decisions of the IEEE 802.3at committee, which is responsible for defining the emerging PoE+ standard.

The TPS23841 power manager is available in volume today from TI and its authorized distributors. The device is packaged in a 64-pin HTQFP package. Suggested resale pricing is $7.50 in quantities of 1,000 units.

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Related Datasheets
Part Number Description Category
? TPS2384 Quad Integrated Power Sourcing Equipment Power Manager (Rev. D) ICs, Interface
? TPS23841 Wide Voltage Range, High Power Quad-Port Ethernet Power Sourcing Equipment Manag (Rev. A) ICs, Interface
? TPS2376-H IEEE 802.3af PoE High Power PD Controller (Rev. A) ICs, Interface



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