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Analog Devices / Maxim Integrated Maxim MAX5988A/B Class 1/2 用电设备

Maxim Integrated MAX5988A / MAX5988B IEEE® 802.3af兼容的Class 1 / Class 2 用电设备(PD) 提供完备的电源方案，满足以太网供电(PoE)系统的需求。MAX5988A 和 MAX5988B 集成PD接口和高效DC-DC转换器，只需较少的外部元件即可构成完整的PD方案。器件还提供低压差线性稳压器、MPS、休眠模式、超低功耗模式等功能。PD接口通过单个外部电阻器提供信号检测与Class 1/Class 2分级签名，还提供隔离功率MOSFET、60mA(最大)浪涌电流限制和321mA (典型值)工作电流限制。集成降压型DC-DC转换器采用峰值电流模式控制，提供便捷的实施架构并具有快速瞬态响应能力。

特性

  • IEEE 802.3af compliant
  • PoE class 1/class 2 classification
  • Sleep and ultra-low power mode
  • Intelligent Maintain Power Signature (MPS)
  • Simplified wall adapter interface
  • Efficient, integrated DC-DC converter (with integrated switches)
  • 8.8V to 60V Wide input voltage range
  • 3.0V to 14V Programmable output voltage range
  • Internal compensation
  • Fixed 215kHz switching frequency
  • Frequency foldback for high-efficiency light-load operation
  • Built-in output-voltage monitoring
  • Open-drain, active-low RESET output
  • Protects against overload, output short circuit, output overvoltage, and overtemperature
  • Hiccup-mode runaway current limit
  • Back-bias capability to optimize the efficiency
  • Integrated TVS diode withstands Cable Discharge Event (CDE)
  • Internal LDO regulator with up to 100mA load

应用

  • IEEE® 802.3af-powered devices
  • IP phones
  • IP security cameras
  • WiMAX® base stations
  • Wireless access nodes

Functional Diagram

Analog Devices / Maxim Integrated Maxim MAX5988A/B Class 1/2 用电设备
发布日期: 2013-01-21 | 更新日期: 2023-04-13