MAX5952CUAX+T

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Power Over Ethernet (PoE) Controllers are typically used for powering Ethernet connected devices over a single cable infrastructure. The MAX5952CUAX+T IC from Maxim Integrated is an integrated PMIC (power management IC) designed to support the standards-based Power over Ethernet applications, as defined by the IEEE 802.3af and IEEE 802.3at. The MAX5952CUAX+T can detect and supply the IEEE 802.3af PD (Power Device) power devices up to 15 watts, and the IEEE 802.3at PDs up to 25 watts. In a modern industrial or commercial setting, businesses leverage their ethernet cable infrastructure to quickly and easily add PoE capable devices where needed, such as multi-port gateways, IP phones, wireless access points, and security cameras. When used to power such devices the MAX5952CUAX+T logic is designed to detect the cable connecting the device and safely power up the endpoint device without overloading the infrastructure.

The MAX5952CUAX+T contains an integrated transformer driver, enabling system designers to reduce the external component count and save valuable board space. The high drive output also gives optimal isolation and performance, improving EMI and transient suppression. The MAX5952CUAX+T integrates fault protection features including over-current and thermal protection, as well as an adjustable fault timer and a soft-start feature to reduce in-rush current. The fault pins can be used to indicate the presence of detected faults and to shut down the power output from the IC.

The MAX5952CUAX+T employs a constant on-time control technique for improving operational efficiency across a wide range of output power levels. Compared to pulse width modulation (PWM) schemes, the constant on-time controllers provide a fast transient response and improved efficiency at light loading conditions. The MAX5952CUAX+T IC can provide an efficiency of up to 95%. The IC also contains an internal voltage regulator, allowing for easy design of buck outputs.

The MAX5952CUAX+T provides multiple external class settings, allowing system designers to adjust system power levels to meet the requirements of their application. It also supports robust diagnostic features such as open/short/overload detection, class detection, and output power reporting. This allows the IC to detect and report any issues to help identify and avoid future problems before they occur.

In addition, the MAX5952CUAX+T supports throughput sensing, while measuring the actual power being consumed by the PoE capable device. This feature is used to inform the controller of the actual load on the port, with the goal of enabling the controller to achieve ?just-right? power levels for the application. With the help of this feature, the controller monitors the load and maintains the port power at the desired levels by adjusting the output voltage of the port.

The MAX5952CUAX+T controller is designed for use with a wide variety of applications for a wide range of power delivery requirements. From distributed industrial applications and multi-port PoE gateways, to IP communications equipment, PoE cameras, and wireless access points, the MAX5952CUAX+T provides an efficient, cost-effective solution for supplying these devices with power.

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