LT1640L

LT1640L/LT1640H Negative Voltage Hot Swap Controller FEATURES s s s s s s s 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. The PWRGD (LTC1640L) or PWRGD (LTC1640H) signal can be used to directly enable a power module. The LT1640L is designed for modules with a low enable input and the LT1640H for modules with a high enable input. The LT1640L/LT1640H is available in 8-pin PDIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. 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 U APPLICATIONS s s s Central Office Switching – 48V Distributed Power Systems Negative Power Supply Control TYPICAL APPLICATION Input Inrush Current GND R4 562k 1% UV = 37V R5 9.09k 1% R6 10k 1% 8 VDD 3 UV LT1640L 2 OV VEE 4 SENSE 5 C1 33nF...