DESCRIPTION
The LT®1640L/LT1640H is an 8-pin, negative voltage Hot SwapTM controller that allows 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 electronic circuit breaker protects the system against shorts.

FEATURES
■ Allows Safe Board Insertion and Removal from a Live –48V Backplane
■ Operates from –10V to –80V
■ Programmable Inrush Current
■ Programmable Electronic Circuit Breaker
■ Programmable Overvoltage Protection
■ Programmable Undervoltage Lockout
■ Power Good Control Output

APPLICATIONS
■ Central Office Switching
■ –48V Distributed Power Systems
■ Negative Power Supply Control