LT4250L

Supply Voltage (VDD  VEE) ................ . 0.3V to 100V
PWRGD, PWRGD Pins ...........................   0.3V to 100V
SENSE, GATE Pins .................................... 0.3V to 20V
UV, OV Pins ..............................................0.3V to 60V
DRAIN Pin ................................................. 2V to 100V
Maximum Junction Temperature .........................125°C
Operating Temperature Range
LT4250LC/LT4250HC ............................. 0°C to 70°C
LT4250LI/LT4250HI .......................... 40°C to 85°C
Storage Temperature Range ............ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................300°C

The LT®4250L/LT4250H are 8-pin, negative 48V Hot SwapTM controllers that allow a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable current limit protects the system against shorts. After a 500ms timeout the current limit activates the electronic circuit breaker. The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module. The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input.

The LT4250L/LT4250H are available in 8-pin PDIP and SO packages.