1640AH

Negative Voltage Hot Swap Controller

DESCRIPTION

The LT®1640AL/LT 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.

FEATURES

■ 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