MAX5972A 19-4924 Rev 1 2/10 IEEE 802.3af/at-Compliant, Powered Device Interface Controller with Integrated Power MOSFET General Description Features S IEEE 802.3af/at Compliant The MAX5972A provides a complete interface for a powered device (PD) to comply with the IEEE 802.3af/ S 2-Event Classification or an External Wall Adapter at standard in a power-over-Ethernet (PoE) system. The Indicator Output MAX5972A provides the PD with a detection signature, S Simplified Wall Adapter Interface classification signature, and an integrated isolation S PoE Classification 0 to 5 power switch with inrush current control. During the inrush period, the MAX5972A limits the current to less S 100V Input Absolute Maximum Rating than 180mA before switching to the higher current limit S Inrush Current Limit of 180mA Maximum (720mA to 880mA) when the isolation power MOSFET S Current Limit During Normal Operation Between is fully enhanced. The device features an input UVLO 720mA and 880mA with wide hysteresis and long deglitch time to compen- S Current Limit and Foldback sate for twisted-pair cable resistive drop and to assure glitch-free transition during power-on/-off conditions. The S Legacy UVLO at 36V MAX5972A can withstand up to 100V at the input. S Overtemperature Protection The MAX5972A supports a 2-event classification method S Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN as specified in the IEEE 802.3at standard and provides a signal to indicate when probed by Type 2 power-sourcing equipment (PSE). The device detects the presence of Ordering Information a wall adapter power-source connection and allows a smooth switch over from the PoE power source to the PIN- SLEEP PART TEMP RANGE wall power adapter. PACKAGE MODE The MAX5972A also provides a power-good (PG) signal, MAX5972AETE+ -40NC to +85NC 16 TQFN-EP* two-step current limit and foldback, overtemperature +Denotes a lead(Pb)-free/RoHS-compliant package. protection, and di/dt limit. *EP = Exposed pad. The MAX5972A is available in a 16-pin, 5mm x 5mm, TQFN power package. This device is rated over the -40NC to +85NC extended temperature range. Pin Configuration Applications TOP VIEW IEEE 802.3af/at-Powered Devices 16 15 14 13 IP Phones, Wireless Access Nodes, IP Security Cameras + WiMAXK Base Station CLS N.C. 1 12 V 2 11 2EC DD MAX5972A DET PG 3 10 EP* WAD I.C. 4 9 5 6 7 8 TQFN (5mm 5mm) WiMAX is a trademark of WiMAX Forum. IEEE is a registered service mark of the Institute of Electrical *EP = EXPOSED PAD. CONNECT TO V . SS and Electronics Engineers, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE V N.C. SS V N.C. SS RTN N.C. RTN N.C.IEEE 802.3af/at-Compliant, Powered Device Interface Controller with Integrated Power MOSFET ABSOLUTE MAXIMUM RATINGS V to V ..........................................................-0.3V to +100V Package Thermal Resistance (Note 2) DD SS B ...............................................................................35NC/W DET, RTN, WAD, PG, 2EC to V -0.3V to +100V JA SS ....................... B .............................................................................2.7NC/W CLS to V ..............................................................-0.3V to +6V JC SS Operating Temperature Range .......................... -40NC to +85NC Maximum Current on CLS (100ms maximum) .................100mA Maximum Junction Temperature .....................................+150NC Continuous Power Dissipation (T = +70NC) (Note 1) A Storage Temperature Range ............................ -65NC to +150NC 16-Pin TQFN (derate 28.6mW/NC above +70NC) Lead Temperature (soldering, 10s) .............................. +300NC Multilayer Board .....................................................2285.7mW Note 1: Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 specifications. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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. ELECTRICAL CHARACTERISTICS (V = (V - V ) = 48V, R = 24.9k, R = 615. RTN, WAD, PG, and 2EC unconnected, all voltages are referenced to V IN DD SS DET CLS SS, unless otherwise noted. T = T = -40NC to +85NC, unless otherwise noted. Typical values are at T = +25NC.) (Note 3) A J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DETECTION MODE Input Offset Current I V = 1.4V to 10.1V (Note 4) 10 OFFSET IN FA Effective Differential Input V = 1.4V up to 10.1V with 1V step, IN dR 23.95 25.00 25.50 kI Resistance V = RTN = WAD = PG = 2EC (Note 5) DD CLASSIFICATION MODE Classification Disable V V rising (Note 6) 22.0 22.8 23.6 V TH,CLS IN Threshold Classification Stability Time 0.2 ms Class 0, R = 615I 0 3.96 CLS Class 1, R = 117I 9.12 11.88 CLS V = 12.5V to IN Class 2, R = 66.5I 17.2 19.8 20.5V, V = CLS DD Classification Current I mA CLASS RTN = WAD = Class 3, R = 43.7I 26.3 29.7 CLS PG = 2EC Class 4, R = 30.9I 36.4 43.6 CLS Class 5, R = 21.3I 52.7 63.3 CLS TYPE 2 (802.3at) CLASSIFICATION MODE Mark Event Threshold V V falling 10.1 10.7 11.6 V THM IN Hysteresis on Mark Event 0.84 V Threshold V falling to enter mark event, 5.2V P V IN IN Mark Event Current I 0.25 0.85 mA MARK P 10.1V Reset Event Threshold V V falling 2.8 4 5.2 V THR IN POWER MODE V Supply Voltage Range 60 V IN V Supply Current I 0.27 0.55 mA IN Q 2 MAX5972A