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-48V、Simple Swapper热插拔开关

-48V热插拔开关,适用于IP电话和通过同一电缆传输数据、电源的数据终端设备

产品详情

主要特征

简化框图

Technical Docs

数据资料 -48V、Simple Swapper热插拔开关 Mar 27, 2001

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主要特征

  • Provides Safe Hot Swap for -16V to -65V Power Supplies
  • 280mA Current Limit for MAX5911
  • 415mA Current Limit for MAX5912
  • Zero-Current Load Disconnect
  • Integrated Power FET
  • Status Output Reports Fault Condition
  • Internal Switch-Protection Circuitry
  • Built-In Thermal Shutdown
  • DGND Can Vary Up to ±5V with Respect to AGND

应用/用途

  • 桥路
  • 网络集线器、交换机和路由器
  • 路由器/交换机

描述

The MAX5911/MAX5912 are fully integrated hot-swap switches for negative supply rails. These devices allow the safe insertion and removal of circuit cards into live backplanes or ports without causing problematic glitches on the negative power-supply rail. They also monitor various circuit parameters and disconnect the load if a fault condition occurs, alerting the host with a logic-level FAULT-bar output. The MAX5911/MAX5912 operate over a voltage range of -16V to -65V and are designed to permit hot plugging of an IP phone into a hub, but are not limited to that operation.

During startup, an internal power FET regulates the current between the backplane power source and the load to 280mA for MAX5911 and 415mA for MAX5912. After startup, the FET is fully enhanced to reduce its on-resistance. To ensure robust operation, the MAX5911/MAX5912 contain built-in safety features that prevent damage to the internal FET. They include an enable input, which responds to positive logic signals (+3.3V or +5V), allowing the host system to disconnect the load. ENABLE is also used to reset the device after a latching fault condition occurs.

The MAX5911/MAX5912 Simple Swapper™ hot-swap ICs monitor four parameters for these fault conditions: undervoltage lockout (UVLO), power-not-good, zero-current detection, and thermal shutdown. These devices are available in the extended temperature range, -40°C to +85°C. The MAX5911 and MAX5912 come in 8-pin and 16-pin SOIC packages, respectively.

简化框图

MAX5911、MAX5912:典型工作电路 MAX5911、MAX5912:典型工作电路 Zoom icon

Technical Docs

数据资料 -48V、Simple Swapper热插拔开关 Mar 27, 2001

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心