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MAX5987A Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX5987A Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page MAX5986A/MAX5987A IEEE 802.3af-Compliant, High-Efficiency, Class 1, Powered Devices with Integrated DC-DC Converter ����������������������������������������������������������������� Maxim Integrated Products 1 19-6261; Rev 0; 4/12 Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX5986A/MAX5987A.related. IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. WiMAX is a registered certification mark and registered service mark of WiMAX Forum. General Description The MAX5986A/MAX5987A provide a complete power- supply solution as IEEE® 802.3af-compliant Class 1 Powered Devices (PDs) in a Power-over-Ethernet (PoE) system. The MAX5986A/MAX5987A integrate the PD interface with an efficient DC-DC converter, offering a low external part count PD solution. The MAX5987A includes a low-dropout regulator and the MAX5986A includes sleep and ultra-low power modes. The PD interface provides a detection signature and a Class 1 classification signature with a single external resistor. The PD interface also provides an isolation power MOSFET, a 60mA (max) inrush current limit, and a 201mA (typ) operating current limit. The integrated step-down DC-DC converter uses a peak current-mode control scheme and provides an easy-to- implement architecture with a fast transient response. The step-down converter operates in a wide input volt- age range from 8.7V to 60V and supports up to 3.84W of input power at 1.15A load. The DC-DC converter operates at a fixed 275kHz switching frequency, with an efficiency-boosting frequency foldback that reduces the switching frequency by half at light loads. The devices feature an input undervoltage-lockout (UVLO) with wide hysteresis and long deglitch time to compensate for twisted-pair cable resistive drop and to assure glitch-free transition during power-on/-off condi- tions. The devices also feature overtemperature shut- down, short-circuit protection, output overvoltage protec- tion, and hiccup current limit for enhanced performance and reliability. The MAX5986A/MAX5987A are available in a 16-pin, 5mm x 5mm, TQFN power package and operate over the -40°C to +85°C temperature range. Applications IEEE 802.3af-Powered Devices IP Phones Wireless Access Nodes IP Security Cameras WiMAX® Base Stations Benefits and Features S IEEE 802.3af Compliant S PoE Class 1 Classification S Simplified Wall Adapter Interface S Efficient, Integrated DC-DC Converter (with Integrated Switches) S 8.7V to 60V Wide Input Voltage Range S 3.0V to 5.6V Programmable Output Voltage Range S Internal Compensation S Fixed 275kHz Switching Frequency S Frequency Foldback for High-Efficiency Light- Load Operation S Built-In Output-Voltage Monitoring S Open-Drain RESET Output (MAX5987A) S Protects Against Overload, Output Short Circuit, Output Overvoltage, and Overtemperature S Hiccup-Mode Runaway Current Limit S Back-Bias Capability to Optimize the Efficiency S Integrated TVS Diode Withstands Cable Discharge Event (CDE) S Internal LDO Regulator with Up to 100mA Load (MAX5987A) S Fixed 3.3V or Adjustable Output Voltage Through an External Resistive Divider S 49mA (typ) Inrush Current Limit S Pass 2kV, 200m CAT-6 Cable Discharge Event EVALUATION KIT AVAILABLE For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. |
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