MAX5991BETP+

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Power over Ethernet (PoE) controllers are foundation components of switch controllers, routers and other network infrastructure. The MAX5991BETP+ from MAXIM Integrated is a 3-Channel PoE Controller designed to maximize the functionality of Power-over-Ethernet (PoE) systems. It is an integrated power management solution including a Direct Current to Direct Current (DC-DC) converter, an Ethernet control logic, PoE system margining and diagnostics for detecting external conditions, and an integrated Gigabit Media Independent Interface (GMII).

The MAX5991BETP+ is a device specifically designed to simplify PoE controller designs, while enabling high efficiency, traditional PoE interfaces, and extended temperature operation. It features a wide input voltage range of 2.3V to 15V, a low-power 3-channel DC-DC controller and SMBus/I2C programmability. Furthermore, it has the capability of powering up to seven powered devices (PDs) concurrently with up to 25.5W of output power per PD, ensuring large PoE networks can be implemented without the need for an additional power supply.

The application field for the MAX5991BETP+ is diverse. It is used in a range of different network equipment, including routers, access points, managed switches, active optical cables, and automated building systems, in addition to a range of peripheral devices and IT systems. The device is ideal for PoE-driver designs for applications that require high current and power levels, such as IP security cameras and industrial controllers.

Working Principle

The MAX5991BETP+ is designed to simplify PoE controller designs while enabling efficient PoE operation. By integrating the DC-DC converter, Ethernet control logic, PoE system margining and diagnostics, and Gigabit Media Independent Interface (GMII) into a single device, the MAX5991BETP+ ensures that fewer external components and wiring are needed. This, in turn, accelerates the design process, decreases system footprint, and reduces cost.

The MAX5991BETP+ contains three PoE channels and they operate the same way. Each channel features an LDO with programmable current limit that can be adjusted by programming the FET gate voltage. The total output current for each channel is the sum of the load current plus the current supplied from the LDO. For each channel, current sense resistors measure the load current and the outputs are regulated by pulse width modulation (PWM) for a constant output voltage, thus ensuring reliable and safe operation of the connected equipment.

In addition, the MAX5991BETP+ provides a GPIO pin that can be used to detect external conditions such as, polarity detection and link status. The device also features a sleep mode which can be enabled by an input pin or SMBus/I2C. This feature is useful for reducing power consumption and extending runtime in PoE systems.

Conclusion

The MAX59901BETP+ is an integrated power management solution for PoE systems, integrating a Direct Current to Direct Current (DC-DC) converter, Ethernet control logic, PoE system margining and diagnostics for detecting external conditions, and an Integrated Gigabit Media Independent Interface (GMII). The device is designed to simplify PoE controller designs while enabling high efficiency, traditional PoE interfaces, and extended temperature operation. The MAX59901BETP+ is used in a range of different network equipment, including routers, access points, managed switches, active optical cables, and automated building systems, in addition to a range of peripheral devices and IT systems. It provides a reliable and safe operation of the connected equipment and enables reduced power consumption and extended runtime in PoE systems.

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