STHS4257A1M6F

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Power over Ethernet (PoE) is an important technology for the global communications industry, enabling the transmission of both data and power over a single Ethernet cable. STMicroelectronics STHS4257A1M6F is a Power Over Ethernet(PoE) controller designed to provide PoE power to end-user devices such as VoIP phones, PDAs, wireless network access points, and embedded control applications.The STHS4257A1M6F controller is incorporated in a small LQFP44 package and includes an integrated DC-DC converter for efficient power delivery, allowing users to reduce the size and complexity of their overall PoE system designs.The STHS4257A1M6F controller supports both the IEEE 802.3af (class 0-3) and the IEEE 802.3at (class 4) PoE protocol standards. It is equipped with an advanced control algorithm for accurate port classification and the ability to detect and report current consumption of PoE endpoints over the entire temperature range. It also includes an embedded PoE restart algorithm that can restart inactive PoE ports and a Cable Length Detection (CLD) algorithm that can detect and accurately report the cable length of the Ethernet cable connected to an external PoE port.The device also features an integrated pulse-width modulation (PWM) controller as well as a range of operational power supply modes. The PWM controller can be used to regulate the output voltage of the integrated DC-DC converter, while the operational power control modes enable the device to interface with a variety of different types of external power supplies.When the STHS4257A1M6F controller is used in conjunction with an external power source, it can provide up to 25.5W of output power at each of its two PoE ports. The device also includes an integrated over-voltage protection circuit that helps protect PoE endpoints from over-voltage damage.The STHS4257A1M6F controller is suitable for use in a wide range of PoE applications, including VoIP phones, wireless access points, PDAs, and other embedded control applications. It is ideal for use in networks that require both power and data transmission over Ethernet cables, and provides an efficient and cost effective way to integrate PoE into a variety of applications.The STHS4257A1M6F controller is designed to provide a complete solution to the challenge of powering and controlling PoE endpoints. The device is interoperable with both IEEE 802.3af and IEEE 802.3at PoE standards, and it also features advanced features such as cable length detection, over-voltage protection, and intelligent restart capability. With its integrated DC-DC converter, the controller is designed to provide up to 25.5W of output power at each port, making it well suited to a wide range of PoE endpoints. This makes the STHS4257A1M6F controller an ideal solution for PoE applications.

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