MAX5980AGTJ+

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Power over Ethernet (PoE) controllers are an increasingly popular technology for providing power to physical devices without increasing the cost of installation and operation through dedicated power supplies. The MAX5980AGTJ+ is a comprehensive 2-phase integrated PWM controller and gate driver optimized for the most challenging power management applications, allowing IEEE802.3at and IEEE802.3af-compatible PoE applications to deliver up to 25W of power to the load. It is designed to enable high performance, low system cost and ease of design.

The MAX5980AGTJ+ provides a low-cost, flexible solution to accommodate a wide range of power management needs. It provides two integrated PWM controllers and a gatedriver with a wide range of features, allowing designers to optimize efficiency and system cost. The integrated dual-channel pulse-width modulators (PWMs) and the gate driver each have independent modes of operation, providing a range of flexibility for various levels of dynamic load switching. The MAX5980AGTJ+ also provides integrated voltage feedback (VFB) circuitry, which helps ensure system stability and minimizes noise and ripple for smoother start-up and shutdown.

The MAX5980AGTJ+ can operate in two modes - either as a two-phase buck converter or as a single-phase buck-boost converter. In buck converter mode, the device reduces the input voltage to the level required by the end application and distributes the power to the load. The buck-boost converter mode allows the output voltage to be adjusted to maintain constant current regulation regardless of input voltage, ensuring an efficient connection to the power source.

The MAX5980AGTJ+ is also designed for immunity for harsh environments, and is compliant with the IEEE802.3at standard for Power over Ethernet (PoE) transmitters. It integrates an automatic current limiter to ensure that no more than 25W of power is delivered to the end application. It also provides a precise voltage regulation with a maximum ripple of 10 mVPP, allowing a reliable and power efficient operation despite fluctuations in the input power.

In addition, the MAX5980AGTJ+ offers a comprehensive set of safety features that enable maximum load current protection, thermal shutdown protection, reverse-current protection, and under-voltage lockout (UVLO). A built-in power supply fault detector provides immediate indication of overcurrent, overvoltage, and undervoltage conditions. Further, the device features an integrated soft-start, which provides a smooth transition to the target output voltage during turn-on and turn-off, minimizing initial inrush current and preventing rapid oscillations and instability.

The MAX5980AGTJ+ is an ideal solution for applications requiring high-efficiency, continuous and robust power over Ethernet systems. With its comprehensive set of features, the device provides a reliable, cost-effective solution for powering remote devices with simplified design, lower cost and reduced power losses, making it the perfect choice for PoE applications.

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