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See Technical Specifications

MAX5922CEUI

Power Over Ethernet PSE Controller 32V 60V 28-Pin TSSOP

Manufacturer:

Analog Devices, Inc
Mfr.Part #:

MAX5922CEUI
Datasheet:

MAX5922CEUI Datasheet (PDF)
Type:

Controller (PSE)
Number of Channels:

1
Power - Max:

15.4 W
Internal Switch(s):

Yes
EDA/CAD Models:

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MAX5922CEUI General Description

The MAX5922A/B/C is a single-port network power controller with an integrated power MOSFET, operating from a +32V to +60V supply rail. The device is specifically designed for power-sourcing equipment (PSE) in power-over-LAN applications and is fully compliant to the IEEE 802.3af standard. The MAX5922 provides power devices (PD) discovery, classification, current limit, and other necessary functions for an IEEE 802.3af compliant PSE. The MAX5922 is suitable for PSE function in both switch/router systems where the power is delivered to the load through the signal pairs, and in midspan systems where the power is delivered to the load through the spare pairs. In midspan mode, a detection collision avoidance circuit (MAX5922A/C only) provides the necessary back-off timing to prevent fault detections that happen when two different PSEs try to detect and power the same PD. The MAX5922B/C have a detection disable input that can be connected high to disable the detection/classification functions or connected low to enable them. The MAX5922 features a programmable undervoltage lockout (UVLO) that keeps the device in shutdown until the input voltage exceeds a certain threshold, set to 38V (MAX5922A) or 28V (MAX5922B/C) internally. After successfully discovering and classifying a PD, the MAX5922 enters startup mode. During startup, the MAX5922 limits the output voltage and current slew rate to minimize EMI (electromagnetic interference). The MAX5922 has an integrated 0.45Ω N-channel power MOSFET that provides efficient operation and simplified system design. The MAX5922 monitors and provides current-limit protection to the load at all times. The current limit is programmable using an external current-sensing resistor. The MAX5922 features current-limit foldback and duty-cycle limit to ensure robust operation during load-fault and short-circuit conditions. Fault management allows the part to either latch-off or autorestart after a fault. The MAX5922 provides POK, active-low ZC, and active-low FAULT status signals to indicate output power is good, zero-current fault, and other faults (overcurrent, overtemperature), respectively. The MAX5922 is available in a 28-pin TSSOP package and is rated over the extended -40°C to +85°C temperature range.

Key Features

IEEE 802.3af Compliant
0.45Ω Integrated Power Switch
Power Device (PD) Detection and Classification
100μA PD Leakage Detection Tolerant
Programmable Current Limit
Zero-Current Detection with Status Output
Detection Collision Avoidance Option for Midspan Application
Input Logic Signals Compatible with 1.8V to 5V CMOS Logic
Separate Analog and Digital Grounds with Up to ±4V Offset
Power-Good Status Output
Overcurrent and Overtemperature Protection with Status Outputs
Current-Limit Foldback with Timeout and Duty-Cycle Control
Latch or Autorestart Fault Management

Application

Computer Telephony
Midspan Power Injectors
Power-Over-LAN/Power-Over-MDI (Media-Dependent Interface)
Power-Sourcing Equipment (PSE)
Single-Port Power Injector/Adapter
Switches/Routers with In-Line Power

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Power Over Ethernet (PoE) Controllers	Series	-
Type	Controller (PSE)	Number of Channels	1
Power - Max	15.4 W	Internal Switch(s)	Yes
Auxiliary Sense	No	Standards	802.3af (PoE)
Voltage - Supply	32V ~ 60V	Current - Supply	1mA
Operating Temperature	-40°C ~ 85°C	Mounting Type	Surface Mount
Base Product Number	MAX5922