MAX5971B

www.DataSheet4U.com 19-5336; Rev 0; 6/10 TION KIT EVALUA BLE IL AVA A Single-Port, 40W, IEEE 802.3af/at, PSE Controller with I2C Features S IEEE 802.3af/at Compliant S Up to 40W for Single-Port PSE Applications S Integrated Power MOSFET and Sense Resistor S Supports 54V Single-Supply Operation S PD Detection and Classification S I2C-Compatible, 2-Wire Serial Interface S Instantaneous Readout of Port Current Through I2C Interface S Programmable Current Limit for Class 5 PDs S High-Capacitance Detection for Legacy Devices S Supports Both DC and AC Load Removal Detections S Current Foldback and Duty-Cycle-Controlled Current Limit S LED Indicator for Port Status S Direct Fast-Shutdown Control Capability S Space-Saving, 28-Pin TQFN (5mm x 5mm) Power Package General Description The MAX5971B is a single-port power controller designed for use in IEEEM 802.3af/at-compliant power-sourcing equipment (PSE). This device provides powered device (PD) discovery, classification, current limit, and DC and AC load-disconnect detections. The MAX5971B supports both fully automatic operation and software programmability, and features an integrated power MOSFET and sense resistor. The device supports detection and classification operation from a single 54V supply. In addition, it supports 2-event classification and new Class 5 classification of high-power PDs. The MAX5971B provides up to 40W to a single port (Class 5 enabled) and still provides high-capacitance detection for legac...