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