EVALUATION KIT AVAILABLE MAX5971B Single-Port, 40W, IEEE 802.3af/at, 2 PSE Controller with I C General Description Features S IEEE 802.3af/at Compliant The MAX5971B is a single-port power controller designed M for use in IEEE 802.3af/at-compliant power-sourcing S Up to 40W for Single-Port PSE Applications equipment (PSE). This device provides powered device S Integrated Power MOSFET and Sense Resistor (PD) discovery, classification, current limit, and DC and S Supports 54V Single-Supply Operation AC load-disconnect detections. The MAX5971B supports S PD Detection and Classification both fully automatic operation and software program- 2 mability, and features an integrated power MOSFET S I C-Compatible, 2-Wire Serial Interface and sense resistor. The device supports detection and S Instantaneous Readout of Port Current Through classification operation from a single 54V supply. In addi- 2 I C Interface tion, it supports 2-event classification and new Class 5 S Programmable Current Limit for Class 5 PDs classification of high-power PDs. The MAX5971B pro- S High-Capacitance Detection for Legacy Devices vides up to 40W to a single port (Class 5 enabled) and still provides high-capacitance detection for legacy PDs. S Supports Both DC and AC Load Removal Detections The device provides four operating modes to suit S Current Foldback and Duty-Cycle-Controlled different system requirements. By default, auto mode Current Limit allows the device to operate automatically at its default S LED Indicator for Port Status settings without any software. Semiautomatic mode automatically detects and classifies a device connected S Direct Fast-Shutdown Control Capability to the port after initial software activation, but does S Space-Saving, 28-Pin TQFN (5mm x 5mm) Power not power the port until instructed to by software. Package Manual mode allows total software control of the device Ordering Information and is useful for system diagnostics. Shutdown mode terminates all port activities and securely turns off power PART TEMP RANGE PIN-PACKAGE to the port. MAX5971BETI+ -40NC to +105NC 28 TQFN-EP* 2 The IC features an I C-compatible, 2-wire serial interface, +Denotes a lead(Pb)-free/RoHS-compliant package. and is fully software-configurable and programmable. *EP = Exposed pad. The device provides instantaneous readout of port cur- 2 rent through the I C interface. The devices extensive Typical Operating Circuit programmability enhances system flexibility, enables field diagnosis and allows for uses in other, non standard applications. The device provides input undervoltage lockout (UVLO), input undervoltage detection, input overvoltage lockout, PSE OUTPUT overtemperature protection, output voltage slew-rate limit AGND V during startup, and LED status indication. The MAX5971B -54V EE OUT programmability includes startup timeout, overcurrent V EE DIG OUTP timeout, and load-disconnect detection timeout. MAX5971B LED The device is available in a space-saving, 28-pin TQFN PWMEN (5mm x 5mm) power package and is rated for the LEGACY DET extended (-40NC to +105NC) temperature range. MIDSPAN ILIM1 Applications OSC ILIM2 Single-Port PSE End-Point Applications EN Single-Port PSE Power Injectors (Midspan Applications) SDA SCL AD0 INT Switches/Routers SERIAL INTERFACE IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-5336 Rev 3 3/16 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX5971B Single-Port, 40W, IEEE 802.3af/at, PSE Controller with I2C ABSOLUTE MAXIMUM RATINGS (Voltages referenced to V , unless otherwise noted.) Maximum Current into LED ................................................40mA EE AGND, DET, LED ..................................................-0.3V to +80V Maximum Current into OUT ........................Internally Regulated OUT ......................................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70NC) AGND A OUTP .......................................................-6V to (V + 0.3V) 28-Pin TQFN (derate 34.5mW/NC above +70NC) ......2758mW AGND Operating Temperature Range ........................ -40NC to +105NC V ................................................................-0.3V to +0.3V EE DIG Storage Temperature Range ............................ -65NC to +150NC OSC .........................................................................-0.3V to +6V Junction Temperature .....................................................+150NC EN, PWMEN, MIDSPAN, LEGACY, ILIM1, ILIM2 ....-0.3V to +4V Lead Temperature (soldering, 10s) ................................+300NC INT, AD0, SCL, SDA ................................................-0.3V to +6V Soldering Temperature (reflow) ......................................+260NC Maximum Current into INT and SDA ..................................80mA 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 1) 28 TQFN Junction-to-Ambient Thermal Resistance (q ) ..........29C/W JA Junction-to-Case Thermal Resistance (q ) .................2C/W JC Note 1: 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 - V = 32V to 60V, T = -40NC to +105NC, all voltages are referenced to V , unless otherwise noted. Typical values are at AGND EE A EE V - V = +54V, T = +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2) AGND EE A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES Operating Voltage Range V V - V 32 60 V AGND AGND EE V = V , all logic inputs unconnected, OUT EE Supply Current I 2.5 4 mA EE measured at AGND in power mode CURRENT LIMIT ICUT = 010 98 126 155 ICUT = 011 185 223 265 Class 0, 1, 2, 3 or 400 420 441 ICUT = 000 Maximum Class 4 or ICUT = 001 684 720 756 I allowed LOAD during Class 5 if ILIM1 = V , EE Current Limit I current-limit ILIM2 = unconnected or 807 850 893 mA LIM conditions, ICUT = 101 V = 0V OUT Class 5 if ILIM1 = (Note 3) unconnected, ILIM2 = V 855 900 945 EE or ICUT = 110 Class 5 if ILIM1 = V , EE 902 950 998 ILIM2 = V or ICUT = 111 EE V - V below which the current AGND OUT Foldback Initial OUT Voltage V 27 V FLBK ST limit starts folding back V - V below which the current AGND OUT Foldback Final OUT Voltage V 10 V FLBK END limit reaches I TH FB Minimum Foldback Current-Limit I V = V 166 mA TH FB OUT AGND Threshold 2 Maxim Integrated