The LT1640AL/LT1640AH are 8-pin, negative voltage Hot Swap™ 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 electronic circuit breaker protects the system against shorts. The PWRGD (LT1640AL) or PWRGD (LT1640AH) signal can be used to directly enable a power module. The LT1640AL is designed for modules with a low enable input and the LT1640AH for modules with a high enable input. The LT1640AL/LT1640AH are available in 8-pin PDIP and SO packages. Applications * Central Office Switching * -48V Distributed Power Systems * Negative Power Supply Control * Allows Safe Board Insertion and Removal from a Live -48V Backplane * Operates from -10V to -80V * Programmable Inrush Current * Allows 50mA of Reverse Drain Pin Current * Programmable Electronic Circuit Breaker * Programmable Overvoltage Protection * Programmable Undervoltage Lockout * Power Good Control Output https://elecena.pl/product/1025799/negative-voltage-hot-swap-controller 2010-02-26 https://elecena.pl/product/1025799/negative-voltage-hot-swap-controller 2014-06-12 https://elecena.pl/product/1025799/negative-voltage-hot-swap-controller 2025-01-20