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IC simplifies design of IEEE 802.3af-compliant PSE

Posted: 10 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:tps2384? texas instruments? ti? power management ic? ieee 802.3af?

Texas Instruments Inc. (TI) announced a next-generation power management IC that promises to simplify the design of IEEE 802.3af-compliant power source equipment (pse).

"As the Power over Ethernet (PoE) market expands, designers are being asked to implement PoE-compliant designs that withstand considerable heat dissipation," said Rich Valley, VP of the company's system power management business. "TI leverages its advanced analog semiconductor manufacturing process to create this new integrated PoE semiconductor technology rugged enough to continue operating over this extreme temperature range."

The versatile, quad-port TPS2384 power manager chip can support operation at -40C to 125C for a wide range of commercial, industrial and military applications such as sophisticated enterprise systems with up to 128 ports to low-port count hub Ethernet switches for small office/home office applications.

The PoE manager effectively manages discovery, classification and delivery of direct-current (DC) power source equipment to a powered device. It offers increased flexibility and performance over TI's TPS2383 PoE manager, introduced in April 2003, while providing necessary power management control and protection. In addition to the ability to detect new PoE-compliant powered devices (PDs) coming on-line, the TPS2384 also can recognize legacy devices.

Three modes of operation
A designer can select from three different modes of operation using the TPS2384 deviceautomatic mode, port-management mode or manual operation. The use of a multi-point or slope detection method for the PD signature resistor allows accurate detection, even when series steering diodes are present. In auto mode, if a proper PD is not detected, the TPS2384 will alert the system to not connect the power. In the port management mode, the host can read the contents of the A2D resistor register after each discovery is completed, and it can set limits for accepting or rejecting the power device. Also while in port-management mode, the product can work with a microcontroller to perform advanced power-management functions and detect legacy capacitance loads.

Leveraging TI's advanced linear Bi-CMOS, 1? copper interconnect process technology and circuit design expertise, the new TPS2384 in automatic mode minimizes the number of required external components to only one external capacitor per port. In addition to reducing overall system cost, the company's manufacturing capability also allows the device to achieve low RDSon with integrated power field effect transistors (FETs).

Housed in a 64-pin HTQFP package, the TPS2384 power manager chip is already available in volume quantities. Suggested resale pricing is $6 in quantities of 1,000.

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