EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX5986AMAX5986C/ IEEE 802.3af-Compliant, High-Efficiency, MAX5987A Class 1/Class 2, PDs with Integrated DC-DC Converter General Description Benefits and Features The MAX5986AMAX5986C/MAX5987A provide a High Integration Saves Space and BOM Cost complete power-supply solution as IEEE 802.3af- Efficient, Integrated DC-DC Converter (with compliant Class 1/Class 2 Powered Devices (PDs) in a Integrated Switches) Built-In Output-Voltage Monitoring Power-over-Ethernet (PoE) system. The devices integrate the PD interface with an efficient DC-DC converter, offering Protects Against Overload, Output Short Circuit, Output Overvoltage, and Overtemperature a low external part count PD solution. The MAX5987A includes a low-dropout regulator and the MAX5986A Integrated TVS Diode Withstands Cable Discharge Event (CDE) MAX5986C include sleep and ultra-low power modes. Internal LDO Regulator with Up to 100mA Load The PD interface provides a detection signature and (MAX5987A) a Class 1/Class 2 classification signature with a single IEEE 802.3af-Compliant Features Reduce Design Time external resistor. The PD interface also provides an PoE Class 1/Class 2 Classification Set with isolation power MOSFET, a 60mA (max) inrush current Single Resistor limit, and a 323mA operating current limit. Intelligent Maintain Power Signature (MPS) The integrated step-down DC-DC converter uses a peak Complies with IEEE 802.3af Specification current-mode control scheme and provides an easy-to- Simplified Wall Adapter Interface implement architecture with a fast transient response. Pass 2kV, 200m CAT-6 Cable Discharge Event The step-down converter operates in a wide input voltage High Efficiency During Light Loads Reduces Power range from 8.7V to 60V and supports up to 6.49W Consumption of input power. The MAX5986A/MAX5986B/MAX5987A Sleep and Ultra-Low-Power Mode (MAX5986A/ operate at a fixed 215kHz switching frequency and MAX5986B/MAX5986C) the MAX5986C operates at a fixed 430kHz switching Frequency Foldback for High-Efficiency Light-Load frequency. The DC-DC converter operates at a fixed Operation switching frequency, with an efficiency-boosting Back-Bias Capability to Optimize the Efficiency frequency foldback that reduces the switching frequency by half at light loads. Robust Performance 8.7V to 60V Wide Input Voltage Range The devices feature an input undervoltage-lockout Hiccup-Mode Runaway Current Limit (UVLO) with wide hysteresis and long deglitch time 49mA (typ) Inrush Current Limit to compensate for twisted-pair cable resistive drop Open-Drain RESET Output (MAX5987A) and to assure glitch-free transition during power-on/off conditions. The devices also feature overtemperature Flexible and Easy to Design With shutdown, short-circuit protection, output overvoltage 3.0V to 14V Programmable Output Voltage Range protection, and hiccup current limit for enhanced perfor- Internal Compensation mance and reliability. Fixed 215kHz/430kHz Switching Frequency Fixed 3.3V or Adjustable Output Voltage through The MAX5986AMAX5986C/MAX5987A are available an External Resistive Divider in a 16-pin, 5mm x 5mm, TQFN power package and operate over the -40C to +85C temperature range. Applications IEEE 802.3af-Powered Devices Ordering Information appears at end of data sheet. IP Phones Wireless Access Nodes IEEE is a registered service mark of the Institute of Electrical IP Security Cameras and Electronics Engineers, Inc. WiMAX Base Stations WiMAX is a registered certification mark and registered service mark of WiMAX Forum. 19-6261 Rev 7 11/18MAX5986AMAX5986C/ IEEE 802.3af-Compliant, High-Efficiency, MAX5987A Class 1/Class 2, PDs with Integrated DC-DC Converter Absolute Maximum Ratings (All voltages referenced to GND, unless otherwise noted.) PGND to GND ......................................................-0.3V to +0.3V V to GND ...........................................................-0.3V to +70V LX Total RMS Current ...........................................................1.6A DD (100V, 100ms, R = 3.3k) (Note 1) Continuous Power Dissipation (T = + 70NC) TEST A V , WAD, RREF to GND ........................ -0.3V to (V + 0.3V) TQFN (derate 28.6mW/NC above +70NC) ..............2285.7mW CC DD AUX, LDO IN, LED to GND .................................... -0.3V to 16V Operating Temperature Range .......................... -40NC to +85NC LDO OUT to GND .............................. -0.3V to (LDO IN + 0.3V) Junction Temperature .....................................................+150NC LDO FB to GND ......................................................-0.3V to +6V Storage Temperature Range ............................ -65NC to +150NC LX to GND ................................................ -0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) ................................+300NC CC LDO OUT, V , FB, RESET, WK, SL, ULP, Soldering Temperature (reflow) ......................................+260NC DRV MPS, CLASS2 to GND .........................................-0.3V to +6V V to V ............................................. -0.3V to (V + 0.3V) DRV DD DD Note 1: See Figure 1, Test Circuit. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 2) Junction-to-Ambient Thermal Resistance (q ) ..............35C/W JA Junction-to-Case Thermal Resistance (q ) .................. 2.7C/W JC Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-lay- er board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = 48V, R = 24.9k, LED, V , SL, ULP, WK, RESET, LDO OUT unconnected, WAD = LDO EN = LDO IN = PGND = GND, DD SIG CC C1 = 68nF, C2 = 10F, C3 = 1F (see Figure 3), V = V = 0V, LX unconnected. V = 0V, V = 0V. All voltages are FB AUX CLASS2 MPS referenced to GND, unless otherwise noted. T = T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) A J A (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER DEVICE (PD) INTERFACE DETECTION MODE Input Offset Current I V = 1.4V to 10.1V (Note 4) 10 FA OFFSET VDD Effective Differential Input V = 1.4V to 10.1V with 1V step, VDD dR 23.95 25.5 kI Resistance (Note 5) CLASSIFICATION MODE Classification Enable Threshold V V rising 10.2 11.5 12.5 V TH,CLS,EN DD Classification Disable Threshold V V rising 22 23 23.8 V TH,CLS,DIS DD Classification Stability Time 2 ms CLASS2 = GND 9.12 10.5 11.88 V = 12.6V DD Classification Current I mA CLASS to 20V CLASS2 = V 16.1 18 20.9 DRV POWER MODE V Supply Voltage Range V 60 V DD DD MAX5986A/B/ 3.6 4.5 MAX5987A V Supply Current I V = 60V mA DD DD DD MAX5986C 4.8 6.6 Maxim Integrated 2 www.maximintegrated.com