Hot Swap Controller 1-CH -80V 8-Pin SOIC N

The MAX5921 hot-swap controllers allow a circuit card to be safely hot plugged into a live backplane. The MAX5921 operate from -20V to -80V and are well suited for -48V power systems. These devices are pin compatible with both the LT1640 and LT4250 and provide improved features over these devices. The MAX5921 provide a controlled turn-on to circuit cards preventing damage to board connectors, board components, and preventing glitches on the power-supply rail. The MAX5921 provide undervoltage, overvoltage, and overcurrent protection. These devices ensure that the input voltage is stable and within tolerance before applying power to the load. Both the MAX5921 protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition. The MAX5921 protect against input voltage steps by limiting the load current to a safe level without turning off power to the load.

• Allows Safe Board Insertion and Removal from a Live -48V Backplane
• Pin-Compatible with LT1640 and LT4250
• Circuit Breaker Immunity to Input Voltage Steps and Current Spikes
• 450mA GATE Pulldown Current During ShortCircuit Condition
• Exponential GATE Pulldown Current
• Withstands -100V Input Transients with No External Components
• Programmable Inrush and Short-Circuit Current Limits
• Operates from -20V to -80V
• Programmable Overvoltage Protection
• Programmable Undervoltage Lockout with Built-In Glitch Filter
• Overcurrent Fault Integrator
• Powers Up into a Shorted Load
• Power-Good Control Output
• Thermal Shutdown Protects External MOSFET