MAX5971AETI+

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Controller (PSE)
Number of Channels:	1
Power - Max:	40W
Internal Switch(s):	Yes
Auxiliary Sense:	No
Standards:	802.3at (PoE+), 802.3af (PoE)
Voltage - Supply:	32 V ~ 60 V
Current - Supply:	2.5mA
Operating Temperature:	-40°C ~ 85°C
Package / Case:	28-WFQFN Exposed Pad
Supplier Device Package:	28-TQFN (5x5)
Base Part Number:	MAX5971

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Introduction to MAX5971AETI+The MAX5971AETI+ is a top-of-the-line Power over Ethernet (PoE) controller from Maxim Integrated. The MAX5971AETI+ offers best-in-class performance, featuring an ultra-low quiescent current of 5 µA, a low-noise regulator, and a Power Management Interrupt Output (PMI) for signaling low-power events to the host processor. The MAX5971AETI+ also offers advanced safety and fault management, including short-circuit protection and inrush current limiting.Application FieldThe MAX5971AETI+ is designed for PoE applications in a variety of Ethernet-based systems and broadband networks. It is ideal for use in network equipment such as Ethernet switches, fiber optics, and wireless access points. The MAX5971AETI+ is also well-suited for cost-sensitive applications such as vehicle highways, Ethernet ports directly connected to users, and Wi-Fi hotspots.Working PrincipleThe MAX5971AETI+ is a 12V synchronous linear regulator with built-in smart PD (Power Delivery) functionality and an integrated buck baseband regulator. It monitors the Ethernet cable for power delivery, such as when a device is powered from a wall outlet. When a PoE-enabled device is connected, the MAX5971AETI+ detects the PoE voltage and negotiates communications with the PD to ensure safe and correct current delivery. The MAX5971AETI+ then draws required current from the available power and provides stable and safe power to the target system.The MAX5971AETI+ also has an integrated fault management mechanism that includes an over-temperature monitor and active user-defined fault conditions. This allows the MAX5971AETI+ to shut down the power supply and alert the host processor when any of these conditions is met, making MAX5971AETI+ a safe and reliable solution for PoE applications.The MAX5971AETI+ also features an adjustable output voltage regulator, allowing users to adjust the output voltage from 1.8V to 12V and maximizing compatibility with a wide range of PoE-connected devices.ConclusionThe MAX5971AETI+ is an ideal solution for Power over Ethernet devices that require both safety and performance. With its integrated fault management, adjustable output voltage regulator, and ultra-low quiescent current of 5 µA, the MAX5971AETI+ provides the highest level of protection and reliable performance in a wide variety of PoE applications.

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