MAXIM MAX5917AESE+

MAX5910/MAX5917 are fully integrated hot-swap switches for positive supply rails. These devices allow safe insertion and removal of boards into live backplanes or ports without disrupting the backplane power rails. They also monitor various circuit parameters and, if a fault condition occurs, disconnect the load and alert the host via a logic-level IFAULT output. The MAX5910/MAX5917 operate over a voltage range of +10V to +65V. They are designed to allow hot-swapping of Internet devices such as IP phones, but are not limited to this application.

During startup, an internal power FET regulates the current between the backplane supply and the load: 280mA for the MAX5910, 567mA for the MAX5917A, and 420mA for the MAX5917B. After startup, the FET is fully enhanced to reduce its on-resistance. To ensure reliable operation, the MAX5910/MAX5917 incorporate safety features that protect the internal FET from damage. They include an enable input that responds to positive logic signals of +3.3V or +5V, allowing the host system to disconnect the load.

• Safe hot-swap for ±10V to ±65V supplies
• IEEE 802.3af compliant (MAX5917A)
• Starts up into 500μF loads (MAX5917A)
• 280mA current limit for MAX5910
• 567mA current limit for MAX5917A
• 420mA current limit for MAX5917B
• Zero-current load detection
• Integrated 2.2Ω power MOSFET
• Status output reports fault conditions
• Internal switch protection circuitry
• Built-in thermal shutdown
• Monitors four parameters for fault conditions: UVLO, power-bad, zero-current detection, and thermal shutdown
• Extended temperature range: -40°C to +85°C
• MAX5910 in 8-pin SO package
• MAX5917A/B in 16-pin SO package

• IP phones
• Power over Ethernet
• Powered via MDI
• Remote power distribution
• Network routers
• Network switches
• Internet appliances