Click here for production status of specific part numbers. MAX5996A/MAX5996B/ IEEE 802.3bt-Compliant, Powered Device with MAX5996C Power Telemetry and Power/Current Limit Benefits and Features General Description The MAX5996A/MAX5996B/MAX5996C provides a Accurate Power Telemetry (Patent Pending) Constant Power/Current Limit (Patent Pending) complete interface for a powered device (PD) to comply LLDP Power/Current Level Reading with the IEEE 802.3af/at/bt standard in a Power-Over- (Patent pending) Ethernet (PoE) system with a detection signature, IEEE802.3bt Compliant classification signature, and an integrated power switch Built-in 90W Isolation Switch with startup inrush current control. During the startup Multi-Classification period, the devices limit the current to 135mA and it Multi-Event Power Level Indication switches to a higher current limit when the power Simplified Wall Adapter Interface MOSFET is fully enhanced. The devices feature a Multi-Event classification, Intelligent MPS, Autoclass, Inrush Current Limit During Startup Current Limit During Normal Operation and an input UVLO with wide hysteresis and deglitch time to assure glitch-free transition during power-on/off. Overtemperature Protection AutoClass The devices can withstand a maximum voltage of 100V at the input. Selectable Green MPS Intelligent MPS (Patent US9152161) The devices can detect the presence of a wall adapter 5mm x 5mm, 16-Pin TQFN power and allow a smooth switch-over from the PoE power source to the wall adapter. The devices also provide a power-good (PG) signal, two-step current limit, Applications and foldback control, overtemperature protection. IEEE 802.3bt Powered Devices The Intelligent Maintain Power Signature (IMPS) feature VOIP Phones, IP Security Cameras allows to automatically enable MPS current by detecting Wireless Access Point the port current. Autoclass feature is to enable advanced Small Cell, Pico Cell applications that allow the PSE to optimize power Lighting allocation to PD. Building Automation When working with dc-dc controller IC, the MAX5996C features a constant power/current limit when the port Ordering Information appears at end of data sheet. power/current consumption reaches PSE power/current limit. Multi-Event indication feature provides patterned signals to indicate power level allocated from PSE to PD in 7 different scenarios, and accurate real-time power telemetry reporting. LLDP pin of the MAX5996C allows to read power/current limit configuration from system microcontroller and overwrite power/current limit from classification process. The MAX5996A/MAX5996B/MAX5996C are available in a 16-pin, 5mm x 5mm, TQFN power package. These devices are rated over the -40C to 125C temperature range. 19-101124 Rev 0 9/21 MAX5996A/MAX5996B/ IEEE 802.3bt-Compliant, Powered Device with MAX5996C Power Telemetry and Power/Current Limit Simplified Block Diagram MEC VIN+ VDD DET PG ENABLE RJ-45 AND BRIDGE RECTIFIER CLSA DC-DC WAD CLSB CONVERTER MAX5996C AUXILIARY POWER RTN VIN- V SS AUC -54V PCN COMP TRSP LLDP -54V V MEC VIN+ DD DET PG ENABLE RJ-45 AND BRIDGE RECTIFIER DC-DC CONVERTER CLSA WAD CLSB MAX5996A AUXILIARY MAX5996B VIN- POWER RTN V SS -54V LED -54V -54V -54V www.maximintegrated.com Maxim Integrated 2