General Description

The MAX5940A/MAX5940B/MAX5940C/MAX5940D provide complete interface function for a powered device (PD) to comply with the IEEE 802.3af standard in a power-over-ethernet system. MAX5940A/MAX5940B/MAX5940C/MAX5940D provide the PD with a detection signature, a classification signature, and an integrated isolation switch with programmable inrush current control.

特性 Features

? Fully Integrated IEEE 802.3af-Compliant PD Interface

? PD Detection and Programmable Classification Signatures

? Less than 10μA Leakage Current Offset During Detection

? Integrated MOSFET For Isolation and Inrush Current Limiting

? 90V Absolute Maximum Rating (MAX5940C/MAX5940D)

? Gate Output Allows External Control of the Internal Isolation MOSFET

? Programmable Inrush Current Control

? Programmable Undervoltage Lockout (MAX5940B/MAX5940D Only)

? Wide UVLO Hysteresis Accommodates TwistedPair Cable Voltage Drop

? PGOOD/PGOOD Outputs to Enable Downstream DC-DC Converters

? -40°C to +85°C Operating Temperature Range

Applications

??? IP Phones

??? Security Cameras

??? Wireless Access Nodes

??? IEEE 802.3af Power Devices

??? Computer Telephony