LM5071MT-80/NOPB

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The LM5071MT-80/NOPB is a Power Management IC (PMIC) designed to provide power over ethernet (PoE) power control and current sensing. The device is intended to be used in DC/DC power supply topologies which are providing isolated power, such as PoE applications. The device is designed to provide a safe and accurate method of controlling current in isolated power systems. It can be used in applications requiring high accuracy current limiting or protection.

The device is optimized to provide stringent current-limit accuracy for PoE applications. It provides an accurate current limit for each of the independent output channels of the power supply, and can be remotely current limited from the system commanding master using the power-limit feature.

The LM5071MT is a configurable PoE controller that provides control, monitoring, and protection features. It features a 24-bit ADC for up to 12-bit resolution on current sense inputs which allows for 0.4% typical current sense accuracy over a wide current range. The device includes a real-time clock for accurate time-stamping of fault conditions. The controller also offers a wide range of protections including over-temperature, over-current, and under-voltage. In addition, the device offers up to four separately configurable power switches (5 A per switch at 80 V) to power the loads.

The device is designed with a power-up/down sequence to meet the Ethernet standard, which requires detection of the Type 1 and Type 2 PoE devices before applying main power. To accomplish this, the LM5071MT provides an integrated, low-power control circuit that can monitor the presence of an Type 1 or Type 2 device at the Ethernet port. Once the valid device is detected, the LM5071MT will sequentially turn on each of the power supplies.

The LM5071MT supports two power supply topologies. The first provides for powering both the cable pairs directly from the source. The second makes use of additional isolated switching supplies for power failover protection. The device includes a set of diagnostic features for successful operation, including input voltage and current monitoring, temperature monitoring, and a power amplifier. With integrated diagnostics, basic on/off control of Type 1/Type 2 PoE devices, and a low-power switch control circuit, the LM5071MT provides a comprehensive solution for PoE applications.

In summary, the LM5071MT-80/NOPB is a comprehensive power manager IC designed for use in isolated power systems such as PoE applications. The device provides a wide range of protection and control features, including current monitoring and control for each of the output channels, and configurable power switches (5 A per switch at 80 V). The device also features power up/down sequencing to meet Ethernet standards, as well as integrated diagnostics features. This makes the LM5071MT-80/NOPB an ideal solution for PoE power control, monitoring, and protection.

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