TI Home > News Releases

News Releases

TI Delivers Next-Generation Power-over-Ethernet Technology for IP Phones, WLAN Access Points and Security Systems

New Controller IC and Plug-in Power Module Simplify Design and Increase Adoption for Ethernet-Powered Appliances

May 17, 2004

DALLAS (May 17, 2004) - Helping customers harness power delivered over a standard Ethernet cable, Texas Instruments Incorporated (TI) (NYSE: TXN) today announced a versatile new integrated circuit (IC) controller and the industry's first Power-over-Ethernet plug-in power module that reduces design time and eases implementation of Ethernet-powered industrial and commercial devices such as WLAN access points, IP phones, security and point-of-sale systems.

Next-Generation Powered Device Controller

TI´s new TPS2375 controller builds upon the success of the TPS2370, introduced in 2003, to effectively manage discovery, classification and delivery of direct-current (DC) power to a powered device. The IC offers increased flexibility and performance as it manages the interface between the power source equipment (PSE) and a commercial or industrial powered device (PD), while providing necessary power management control and protection. 



was created using TI´s linear Bi-CMOS, silicon-on-insulator (LBC-SOI) process technology, which lets the controller withstand transients up to 100 V and operate over an industrial temperature range of -40º C to 85º C. The device also features 15-kV system-level electrostatic device (ESD) capability, adding unprecedented versatility to support extreme Power-over-Ethernet environments. In addition, the controller has an internal 0.6-ohm FET to minimize heat dissipation in the system. 

The controller further protects the powered device by implementing a 450-mA operating current limit, thermal shutdown and in-rush current limiting. The device utilizes a tiny external resistor to program in-rush current limit, enabling interoperability between a wide range of IEEE 802.3af-compliant and pre-802.3af "legacy" PSE systems. For additional technical features, and fixed, adjusted or legacy under-voltage lockout versions of the


, see 



First Complete Power-over-Ethernet Plug-in Module

Realizing time to market is critical, TI also announced the industry´s first, fully IEEE 802.3af-compliant plug-in power module for Ethernet-powered devices. The PTB48540 module significantly reduces time to market for designers of specialized, Ethernet-powered IP phone consoles, security systems, card readers, point-of-sale terminals or other systems that need to quickly detect, classify and deliver up to 10 watts of DC power. Requiring only a small external Power-over-Ethernet isolation transformer, the low-profile module (41 mm x 38 mm x 8.5 mm) provides a complete power solution for powered devices. TI´s TPS2375 controller sits inside the module, as well as an electro-magnetic interference (EMI)/input voltage transient filter, and both data and spare line bridge networks. The module is available in 3.3-V, 5-V or 12-V outputs with through-hole or surface mount device (SMD) mounting options. For more technical information on the PTB48540 plug-in module, see www.ti.com/sc04104b.

Proven Interoperability

The TPS2375 and PTB48540 recently passed independent IEEE 802.3af parametric tests and interoperability tests conducted at The University of New Hampshire´s Power-over-Ethernet Interoperability Lab (UNH IOL). The IOL regularly conducts testing with TI´s technology and equipment from other members of the university´s Power-over-Ethernet consortium, such as Cisco, Nortel, 3Com, AVAYA, Extreme Networks and HP. 

Leading Power over Ethernet Portfolio

In May of 2003, TI delivered the industry´s first IEEE 802.3af-compliant powered device controller, the TPS2370, and power sourcing equipment manager, the TPS2383, which manages power in multiple Ethernet ports. Leveraging its volume production capabilities, TI´s technology is currently being designed into hundreds of powered devices at leading companies around the world. TI also plans to incorporate the TPS2375 in its next-generation TNETV1050 IP phone solution, a highly integrated system-on-a-chip offering unparalleled scalability and processing technology for manufacturers of IP phones. Evaluation modules of the TPS2375 and PTB48540, complete reference designs, application notes and technical documentation are available through power.ti.com/poe.

Available Today

The TPS2375 powered device controller and the PTB48540 plug-in module are available in volume today from TI and its authorized distributors. The TPS2375 is packaged in an 8-pin (SOIC) or 8-pin thin shrink small outline package (TSSOP), and the PTB48540 comes in a 13-pin, double-sided, through-hole or surface-mount package. Suggested resale pricing is $1.25 each for the TPS2375 in quantities of 1,000 units, and $26 for the PTB48540 in quantities of 1,000.