Maxim Integrated MAX5939EESA T

Description
The MAX5921/MAX5939 hot-swap controllers enable safe hot plugging of circuit cards into live backplanes. They operate from -20V to -80V and are suitable for -48V power systems. These devices provide controlled turn-on to prevent damage to board components and glitches on the power supply rail. They offer undervoltage, overvoltage, and overcurrent protection, ensuring input voltage stability before applying power to the load. Both devices protect against overcurrent and short-circuit conditions by turning off the external MOSFET during faults. They also limit load current during input voltage steps to prevent power loss.

Features
Safe board insertion and removal from live -48V backplanes
Pin compatibility with LT1640 and LT4250
Circuit breaker immunity to input voltage steps and current spikes
450mA GATE pulldown current during short-circuit conditions
Exponential GATE pulldown current
Withstands -100V input transients without 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

Applications
Telecom line cards
Network switches/routers
Central-office line cards
Server line cards
Base-station line cards